llvm-for-llvmta/test/Transforms/InstCombine/select.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s

; PR1822

target datalayout = "e-p:64:64-p1:16:16-p2:32:32:32-p3:64:64:64"

define i1 @test5(i1 %C) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:    [[NOT_C:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT:    ret i1 [[NOT_C]]
;
  %V = select i1 %C, i1 false, i1 true
  ret i1 %V
}

define i32 @test6(i1 %C) {
; CHECK-LABEL: @test6(
; CHECK-NEXT:    [[V:%.*]] = zext i1 [[C:%.*]] to i32
; CHECK-NEXT:    ret i32 [[V]]
;
  %V = select i1 %C, i32 1, i32 0
  ret i32 %V
}

define i1 @trueval_is_true(i1 %C, i1 %X) {
; CHECK-LABEL: @trueval_is_true(
; CHECK-NEXT:    [[R:%.*]] = or i1 [[C:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %R = select i1 %C, i1 true, i1 %X
  ret i1 %R
}

define <2 x i1> @trueval_is_true_vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @trueval_is_true_vec(
; CHECK-NEXT:    [[R:%.*]] = or <2 x i1> [[C:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %R = select <2 x i1> %C, <2 x i1> <i1 true, i1 true>, <2 x i1> %X
  ret <2 x i1> %R
}

define <2 x i1> @trueval_is_true_vec_undef_elt(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @trueval_is_true_vec_undef_elt(
; CHECK-NEXT:    [[R:%.*]] = or <2 x i1> [[C:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %R = select <2 x i1> %C, <2 x i1> <i1 undef, i1 true>, <2 x i1> %X
  ret <2 x i1> %R
}

define i1 @test8(i1 %C, i1 %X) {
; CHECK-LABEL: @test8(
; CHECK-NEXT:    [[R:%.*]] = and i1 [[C:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %R = select i1 %C, i1 %X, i1 false
  ret i1 %R
}

define <2 x i1> @test8vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test8vec(
; CHECK-NEXT:    [[R:%.*]] = and <2 x i1> [[C:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %R = select <2 x i1> %C, <2 x i1> %X, <2 x i1> <i1 false, i1 false>
  ret <2 x i1> %R
}

define <vscale x 2 x i1> @test8vvec(<vscale x 2 x i1> %C, <vscale x 2 x i1> %X) {
; CHECK-LABEL: @test8vvec(
; CHECK-NEXT:    [[R:%.*]] = and <vscale x 2 x i1> [[C:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret <vscale x 2 x i1> [[R]]
;
  %R = select <vscale x 2 x i1> %C, <vscale x 2 x i1> %X, <vscale x 2 x i1> zeroinitializer
  ret <vscale x 2 x i1> %R
}

define i1 @test9(i1 %C, i1 %X) {
; CHECK-LABEL: @test9(
; CHECK-NEXT:    [[NOT_C:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT:    [[R:%.*]] = and i1 [[NOT_C]], [[X:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %R = select i1 %C, i1 false, i1 %X
  ret i1 %R
}

define <2 x i1> @test9vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test9vec(
; CHECK-NEXT:    [[NOT_C:%.*]] = xor <2 x i1> [[C:%.*]], <i1 true, i1 true>
; CHECK-NEXT:    [[R:%.*]] = and <2 x i1> [[NOT_C]], [[X:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %R = select <2 x i1> %C, <2 x i1> <i1 false, i1 false>, <2 x i1> %X
  ret <2 x i1> %R
}

define <vscale x 2 x i1> @test9vvec(<vscale x 2 x i1> %C, <vscale x 2 x i1> %X) {
; CHECK-LABEL: @test9vvec(
; CHECK-NEXT:    [[NOT_C:%.*]] = xor <vscale x 2 x i1> [[C:%.*]], shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> undef, i1 true, i32 0), <vscale x 2 x i1> undef, <vscale x 2 x i32> zeroinitializer)
; CHECK-NEXT:    [[R:%.*]] = and <vscale x 2 x i1> [[NOT_C]], [[X:%.*]]
; CHECK-NEXT:    ret <vscale x 2 x i1> [[R]]
;
  %R = select <vscale x 2 x i1> %C, <vscale x 2 x i1> zeroinitializer, <vscale x 2 x i1> %X
  ret <vscale x 2 x i1> %R
}

define i1 @test10(i1 %C, i1 %X) {
; CHECK-LABEL: @test10(
; CHECK-NEXT:    [[NOT_C:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT:    [[R:%.*]] = or i1 [[NOT_C]], [[X:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %R = select i1 %C, i1 %X, i1 true
  ret i1 %R
}

define <2 x i1> @test10vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test10vec(
; CHECK-NEXT:    [[NOT_C:%.*]] = xor <2 x i1> [[C:%.*]], <i1 true, i1 true>
; CHECK-NEXT:    [[R:%.*]] = or <2 x i1> [[NOT_C]], [[X:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %R = select <2 x i1> %C, <2 x i1> %X, <2 x i1> <i1 true, i1 true>
  ret <2 x i1> %R
}

define i1 @test23(i1 %a, i1 %b) {
; CHECK-LABEL: @test23(
; CHECK-NEXT:    [[C:%.*]] = and i1 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i1 [[C]]
;
  %c = select i1 %a, i1 %b, i1 %a
  ret i1 %c
}

define <2 x i1> @test23vec(<2 x i1> %a, <2 x i1> %b) {
; CHECK-LABEL: @test23vec(
; CHECK-NEXT:    [[C:%.*]] = and <2 x i1> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[C]]
;
  %c = select <2 x i1> %a, <2 x i1> %b, <2 x i1> %a
  ret <2 x i1> %c
}

define i1 @test24(i1 %a, i1 %b) {
; CHECK-LABEL: @test24(
; CHECK-NEXT:    [[C:%.*]] = or i1 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i1 [[C]]
;
  %c = select i1 %a, i1 %a, i1 %b
  ret i1 %c
}

define <2 x i1> @test24vec(<2 x i1> %a, <2 x i1> %b) {
; CHECK-LABEL: @test24vec(
; CHECK-NEXT:    [[C:%.*]] = or <2 x i1> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[C]]
;
  %c = select <2 x i1> %a, <2 x i1> %a, <2 x i1> %b
  ret <2 x i1> %c
}

define i1 @test62(i1 %A, i1 %B) {
; CHECK-LABEL: @test62(
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[A:%.*]], true
; CHECK-NEXT:    [[C:%.*]] = and i1 [[NOT]], [[B:%.*]]
; CHECK-NEXT:    ret i1 [[C]]
;
  %not = xor i1 %A, true
  %C = select i1 %A, i1 %not, i1 %B
  ret i1 %C
}

define <2 x i1> @test62vec(<2 x i1> %A, <2 x i1> %B) {
; CHECK-LABEL: @test62vec(
; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i1> [[A:%.*]], <i1 true, i1 true>
; CHECK-NEXT:    [[C:%.*]] = and <2 x i1> [[NOT]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[C]]
;
  %not = xor <2 x i1> %A, <i1 true, i1 true>
  %C = select <2 x i1> %A, <2 x i1> %not, <2 x i1> %B
  ret <2 x i1> %C
}

define i1 @test63(i1 %A, i1 %B) {
; CHECK-LABEL: @test63(
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[A:%.*]], true
; CHECK-NEXT:    [[C:%.*]] = or i1 [[NOT]], [[B:%.*]]
; CHECK-NEXT:    ret i1 [[C]]
;
  %not = xor i1 %A, true
  %C = select i1 %A, i1 %B, i1 %not
  ret i1 %C
}

define <2 x i1> @test63vec(<2 x i1> %A, <2 x i1> %B) {
; CHECK-LABEL: @test63vec(
; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i1> [[A:%.*]], <i1 true, i1 true>
; CHECK-NEXT:    [[C:%.*]] = or <2 x i1> [[NOT]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[C]]
;
  %not = xor <2 x i1> %A, <i1 true, i1 true>
  %C = select <2 x i1> %A, <2 x i1> %B, <2 x i1> %not
  ret <2 x i1> %C
}

define i32 @test11(i32 %a) {
; CHECK-LABEL: @test11(
; CHECK-NEXT:    [[C:%.*]] = icmp ne i32 [[A:%.*]], 0
; CHECK-NEXT:    [[R:%.*]] = zext i1 [[C]] to i32
; CHECK-NEXT:    ret i32 [[R]]
;
  %C = icmp eq i32 %a, 0
  %R = select i1 %C, i32 0, i32 1
  ret i32 %R
}

define i32 @test12(i1 %cond, i32 %a) {
; CHECK-LABEL: @test12(
; CHECK-NEXT:    [[B:%.*]] = zext i1 [[COND:%.*]] to i32
; CHECK-NEXT:    [[C:%.*]] = or i32 [[B]], [[A:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %b = or i32 %a, 1
  %c = select i1 %cond, i32 %b, i32 %a
  ret i32 %c
}

define <2 x i32> @test12vec(<2 x i1> %cond, <2 x i32> %a) {
; CHECK-LABEL: @test12vec(
; CHECK-NEXT:    [[B:%.*]] = zext <2 x i1> [[COND:%.*]] to <2 x i32>
; CHECK-NEXT:    [[C:%.*]] = or <2 x i32> [[B]], [[A:%.*]]
; CHECK-NEXT:    ret <2 x i32> [[C]]
;
  %b = or <2 x i32> %a, <i32 1, i32 1>
  %c = select <2 x i1> %cond, <2 x i32> %b, <2 x i32> %a
  ret <2 x i32> %c
}

define i32 @test12a(i1 %cond, i32 %a) {
; CHECK-LABEL: @test12a(
; CHECK-NEXT:    [[B:%.*]] = zext i1 [[COND:%.*]] to i32
; CHECK-NEXT:    [[C:%.*]] = ashr i32 [[A:%.*]], [[B]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %b = ashr i32 %a, 1
  %c = select i1 %cond, i32 %b, i32 %a
  ret i32 %c
}

define <2 x i32> @test12avec(<2 x i1> %cond, <2 x i32> %a) {
; CHECK-LABEL: @test12avec(
; CHECK-NEXT:    [[B:%.*]] = zext <2 x i1> [[COND:%.*]] to <2 x i32>
; CHECK-NEXT:    [[C:%.*]] = ashr <2 x i32> [[A:%.*]], [[B]]
; CHECK-NEXT:    ret <2 x i32> [[C]]
;
  %b = ashr <2 x i32> %a, <i32 1, i32 1>
  %c = select <2 x i1> %cond, <2 x i32> %b, <2 x i32> %a
  ret <2 x i32> %c
}

define i32 @test12b(i1 %cond, i32 %a) {
; CHECK-LABEL: @test12b(
; CHECK-NEXT:    [[NOT_COND:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT:    [[B:%.*]] = zext i1 [[NOT_COND]] to i32
; CHECK-NEXT:    [[D:%.*]] = ashr i32 [[A:%.*]], [[B]]
; CHECK-NEXT:    ret i32 [[D]]
;
  %b = ashr i32 %a, 1
  %d = select i1 %cond, i32 %a, i32 %b
  ret i32 %d
}

define <2 x i32> @test12bvec(<2 x i1> %cond, <2 x i32> %a) {
; CHECK-LABEL: @test12bvec(
; CHECK-NEXT:    [[NOT_COND:%.*]] = xor <2 x i1> [[COND:%.*]], <i1 true, i1 true>
; CHECK-NEXT:    [[B:%.*]] = zext <2 x i1> [[NOT_COND]] to <2 x i32>
; CHECK-NEXT:    [[D:%.*]] = ashr <2 x i32> [[A:%.*]], [[B]]
; CHECK-NEXT:    ret <2 x i32> [[D]]
;
  %b = ashr <2 x i32> %a, <i32 1, i32 1>
  %d = select <2 x i1> %cond, <2 x i32> %a, <2 x i32> %b
  ret <2 x i32> %d
}

define i32 @test13(i32 %a, i32 %b) {
; CHECK-LABEL: @test13(
; CHECK-NEXT:    ret i32 [[B:%.*]]
;
  %C = icmp eq i32 %a, %b
  %V = select i1 %C, i32 %a, i32 %b
  ret i32 %V
}

define i32 @test13a(i32 %a, i32 %b) {
; CHECK-LABEL: @test13a(
; CHECK-NEXT:    ret i32 [[A:%.*]]
;
  %C = icmp ne i32 %a, %b
  %V = select i1 %C, i32 %a, i32 %b
  ret i32 %V
}

define i32 @test13b(i32 %a, i32 %b) {
; CHECK-LABEL: @test13b(
; CHECK-NEXT:    ret i32 [[A:%.*]]
;
  %C = icmp eq i32 %a, %b
  %V = select i1 %C, i32 %b, i32 %a
  ret i32 %V
}

define i1 @test14a(i1 %C, i32 %X) {
; CHECK-LABEL: @test14a(
; CHECK-NEXT:    [[R1:%.*]] = icmp slt i32 [[X:%.*]], 1
; CHECK-NEXT:    [[NOT_C:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT:    [[R:%.*]] = or i1 [[R1]], [[NOT_C]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %V = select i1 %C, i32 %X, i32 0
  ; (X < 1) | !C
  %R = icmp slt i32 %V, 1
  ret i1 %R
}

define i1 @test14b(i1 %C, i32 %X) {
; CHECK-LABEL: @test14b(
; CHECK-NEXT:    [[R1:%.*]] = icmp slt i32 [[X:%.*]], 1
; CHECK-NEXT:    [[R:%.*]] = or i1 [[R1]], [[C:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %V = select i1 %C, i32 0, i32 %X
  ; (X < 1) | C
  %R = icmp slt i32 %V, 1
  ret i1 %R
}

define i32 @test16(i1 %C, i32* %P) {
; CHECK-LABEL: @test16(
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %P2 = select i1 %C, i32* %P, i32* null
  %V = load i32, i32* %P2
  ret i32 %V
}

;; It may be legal to load from a null address in a non-zero address space
define i32 @test16_neg(i1 %C, i32 addrspace(1)* %P) {
; CHECK-LABEL: @test16_neg(
; CHECK-NEXT:    [[P2:%.*]] = select i1 [[C:%.*]], i32 addrspace(1)* [[P:%.*]], i32 addrspace(1)* null
; CHECK-NEXT:    [[V:%.*]] = load i32, i32 addrspace(1)* [[P2]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %P2 = select i1 %C, i32 addrspace(1)* %P, i32 addrspace(1)* null
  %V = load i32, i32 addrspace(1)* %P2
  ret i32 %V
}

define i32 @test16_neg2(i1 %C, i32 addrspace(1)* %P) {
; CHECK-LABEL: @test16_neg2(
; CHECK-NEXT:    [[P2:%.*]] = select i1 [[C:%.*]], i32 addrspace(1)* null, i32 addrspace(1)* [[P:%.*]]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32 addrspace(1)* [[P2]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %P2 = select i1 %C, i32 addrspace(1)* null, i32 addrspace(1)* %P
  %V = load i32, i32 addrspace(1)* %P2
  ret i32 %V
}

;; It may be legal to load from a null address with null pointer valid attribute.
define i32 @test16_no_null_opt(i1 %C, i32* %P) #0 {
; CHECK-LABEL: @test16_no_null_opt(
; CHECK-NEXT:    [[P2:%.*]] = select i1 [[C:%.*]], i32* [[P:%.*]], i32* null
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P2]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %P2 = select i1 %C, i32* %P, i32* null
  %V = load i32, i32* %P2
  ret i32 %V
}

define i32 @test16_no_null_opt_2(i1 %C, i32* %P) #0 {
; CHECK-LABEL: @test16_no_null_opt_2(
; CHECK-NEXT:    [[P2:%.*]] = select i1 [[C:%.*]], i32* null, i32* [[P:%.*]]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P2]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %P2 = select i1 %C, i32* null, i32* %P
  %V = load i32, i32* %P2
  ret i32 %V
}

attributes #0 = { null_pointer_is_valid }

define i1 @test17(i32* %X, i1 %C) {
; CHECK-LABEL: @test17(
; CHECK-NEXT:    [[RV1:%.*]] = icmp eq i32* [[X:%.*]], null
; CHECK-NEXT:    [[NOT_C:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT:    [[RV:%.*]] = or i1 [[RV1]], [[NOT_C]]
; CHECK-NEXT:    ret i1 [[RV]]
;
  %R = select i1 %C, i32* %X, i32* null
  %RV = icmp eq i32* %R, null
  ret i1 %RV
}

define i32 @test18(i32 %X, i32 %Y, i1 %C) {
; CHECK-LABEL: @test18(
; CHECK-NEXT:    [[V:%.*]] = sdiv i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT:    ret i32 [[V]]
;
  %R = select i1 %C, i32 %X, i32 0
  %V = sdiv i32 %Y, %R
  ret i32 %V
}

define i32 @test19(i32 %x) {
; CHECK-LABEL: @test19(
; CHECK-NEXT:    [[X_LOBIT:%.*]] = ashr i32 [[X:%.*]], 31
; CHECK-NEXT:    ret i32 [[X_LOBIT]]
;
  %tmp = icmp ugt i32 %x, 2147483647
  %retval = select i1 %tmp, i32 -1, i32 0
  ret i32 %retval
}

define i32 @test20(i32 %x) {
; CHECK-LABEL: @test20(
; CHECK-NEXT:    [[X_LOBIT:%.*]] = ashr i32 [[X:%.*]], 31
; CHECK-NEXT:    ret i32 [[X_LOBIT]]
;
  %tmp = icmp slt i32 %x, 0
  %retval = select i1 %tmp, i32 -1, i32 0
  ret i32 %retval
}

define i64 @test21(i32 %x) {
; CHECK-LABEL: @test21(
; CHECK-NEXT:    [[X_LOBIT:%.*]] = ashr i32 [[X:%.*]], 31
; CHECK-NEXT:    [[TMP1:%.*]] = sext i32 [[X_LOBIT]] to i64
; CHECK-NEXT:    ret i64 [[TMP1]]
;
  %tmp = icmp slt i32 %x, 0
  %retval = select i1 %tmp, i64 -1, i64 0
  ret i64 %retval
}

define i16 @test22(i32 %x) {
; CHECK-LABEL: @test22(
; CHECK-NEXT:    [[X_LOBIT:%.*]] = ashr i32 [[X:%.*]], 31
; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[X_LOBIT]] to i16
; CHECK-NEXT:    ret i16 [[TMP1]]
;
  %tmp = icmp slt i32 %x, 0
  %retval = select i1 %tmp, i16 -1, i16 0
  ret i16 %retval
}

define i32 @test25(i1 %c)  {
; CHECK-LABEL: @test25(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[JUMP:%.*]], label [[RET:%.*]]
; CHECK:       jump:
; CHECK-NEXT:    br label [[RET]]
; CHECK:       ret:
; CHECK-NEXT:    [[B:%.*]] = phi i32 [ 10, [[JUMP]] ], [ 20, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[B]]
;
entry:
  br i1 %c, label %jump, label %ret
jump:
  br label %ret
ret:
  %a = phi i1 [true, %jump], [false, %entry]
  %b = select i1 %a, i32 10, i32 20
  ret i32 %b
}

define i32 @test26(i1 %cond)  {
; CHECK-LABEL: @test26(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[JUMP:%.*]], label [[RET:%.*]]
; CHECK:       jump:
; CHECK-NEXT:    br label [[RET]]
; CHECK:       ret:
; CHECK-NEXT:    [[B:%.*]] = phi i32 [ 10, [[JUMP]] ], [ 20, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[B]]
;
entry:
  br i1 %cond, label %jump, label %ret
jump:
  %c = or i1 false, false
  br label %ret
ret:
  %a = phi i1 [true, %entry], [%c, %jump]
  %b = select i1 %a, i32 20, i32 10
  ret i32 %b
}

define i32 @test26_logical(i1 %cond)  {
; CHECK-LABEL: @test26_logical(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[JUMP:%.*]], label [[RET:%.*]]
; CHECK:       jump:
; CHECK-NEXT:    br label [[RET]]
; CHECK:       ret:
; CHECK-NEXT:    [[B:%.*]] = phi i32 [ 10, [[JUMP]] ], [ 20, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[B]]
;
entry:
  br i1 %cond, label %jump, label %ret
jump:
  %c = select i1 false, i1 true, i1 false
  br label %ret
ret:
  %a = phi i1 [true, %entry], [%c, %jump]
  %b = select i1 %a, i32 20, i32 10
  ret i32 %b
}

define i32 @test27(i1 %c, i32 %A, i32 %B)  {
; CHECK-LABEL: @test27(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[JUMP:%.*]], label [[RET:%.*]]
; CHECK:       jump:
; CHECK-NEXT:    br label [[RET]]
; CHECK:       ret:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[A:%.*]], [[JUMP]] ], [ [[B:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %c, label %jump, label %ret
jump:
  br label %ret
ret:
  %p = phi i1 [true, %jump], [false, %entry]
  %s = select i1 %p, i32 %A, i32 %B
  ret i32 %s
}

define i32 @test28(i1 %cond, i32 %A, i32 %B)  {
; CHECK-LABEL: @test28(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[JUMP:%.*]], label [[RET:%.*]]
; CHECK:       jump:
; CHECK-NEXT:    br label [[RET]]
; CHECK:       ret:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[A:%.*]], [[JUMP]] ], [ [[B:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %cond, label %jump, label %ret
jump:
  br label %ret
ret:
  %c = phi i32 [%A, %jump], [%B, %entry]
  %p = phi i1 [true, %jump], [false, %entry]
  %s = select i1 %p, i32 %A, i32 %c
  ret i32 %s
}

define i32 @test29(i1 %cond, i32 %A, i32 %B)  {
; CHECK-LABEL: @test29(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[JUMP:%.*]], label [[RET:%.*]]
; CHECK:       jump:
; CHECK-NEXT:    br label [[RET]]
; CHECK:       ret:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[A:%.*]], [[JUMP]] ], [ [[B:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    br label [[NEXT:%.*]]
; CHECK:       next:
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %cond, label %jump, label %ret
jump:
  br label %ret
ret:
  %c = phi i32 [%A, %jump], [%B, %entry]
  %p = phi i1 [true, %jump], [false, %entry]
  br label %next

next:
  %s = select i1 %p, i32 %A, i32 %c
  ret i32 %s
}

; SMAX(SMAX(x, y), x) -> SMAX(x, y)
define i32 @test30(i32 %x, i32 %y) {
; CHECK-LABEL: @test30(
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], i32 [[X]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[COND]]
;
  %cmp = icmp sgt i32 %x, %y
  %cond = select i1 %cmp, i32 %x, i32 %y
  %cmp5 = icmp sgt i32 %cond, %x
  %retval = select i1 %cmp5, i32 %cond, i32 %x
  ret i32 %retval
}

; UMAX(UMAX(x, y), x) -> UMAX(x, y)
define i32 @test31(i32 %x, i32 %y) {
; CHECK-LABEL: @test31(
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], i32 [[X]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[COND]]
;
  %cmp = icmp ugt i32 %x, %y
  %cond = select i1 %cmp, i32 %x, i32 %y
  %cmp5 = icmp ugt i32 %cond, %x
  %retval = select i1 %cmp5, i32 %cond, i32 %x
  ret i32 %retval
}

; SMIN(SMIN(x, y), x) -> SMIN(x, y)
define i32 @test32(i32 %x, i32 %y) {
; CHECK-LABEL: @test32(
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], i32 [[Y]], i32 [[X]]
; CHECK-NEXT:    ret i32 [[COND]]
;
  %cmp = icmp sgt i32 %x, %y
  %cond = select i1 %cmp, i32 %y, i32 %x
  %cmp5 = icmp sgt i32 %cond, %x
  %retval = select i1 %cmp5, i32 %x, i32 %cond
  ret i32 %retval
}

; MAX(MIN(x, y), x) -> x
define i32 @test33(i32 %x, i32 %y) {
; CHECK-LABEL: @test33(
; CHECK-NEXT:    ret i32 [[X:%.*]]
;
  %cmp = icmp sgt i32 %x, %y
  %cond = select i1 %cmp, i32 %y, i32 %x
  %cmp5 = icmp sgt i32 %cond, %x
  %retval = select i1 %cmp5, i32 %cond, i32 %x
  ret i32 %retval
}

; MIN(MAX(x, y), x) -> x
define i32 @test34(i32 %x, i32 %y) {
; CHECK-LABEL: @test34(
; CHECK-NEXT:    ret i32 [[X:%.*]]
;
  %cmp = icmp sgt i32 %x, %y
  %cond = select i1 %cmp, i32 %x, i32 %y
  %cmp5 = icmp sgt i32 %cond, %x
  %retval = select i1 %cmp5, i32 %x, i32 %cond
  ret i32 %retval
}

define i1 @test38(i1 %cond) {
; CHECK-LABEL: @test38(
; CHECK-NEXT:    ret i1 false
;
  %zero = alloca i32
  %one = alloca i32
  %ptr = select i1 %cond, i32* %zero, i32* %one
  %isnull = icmp eq i32* %ptr, null
  ret i1 %isnull
}

define i1 @test39(i1 %cond, double %x) {
; CHECK-LABEL: @test39(
; CHECK-NEXT:    ret i1 true
;
  %s = select i1 %cond, double %x, double 0x7FF0000000000000 ; RHS = +infty
  %cmp = fcmp ule double %x, %s
  ret i1 %cmp
}

define i1 @test40(i1 %cond) {
; CHECK-LABEL: @test40(
; CHECK-NEXT:    ret i1 false
;
  %a = alloca i32
  %b = alloca i32
  %c = alloca i32
  %s = select i1 %cond, i32* %a, i32* %b
  %r = icmp eq i32* %s, %c
  ret i1 %r
}

define i32 @test41(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @test41(
; CHECK-NEXT:    [[R:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %z = and i32 %x, %y
  %s = select i1 %cond, i32 %y, i32 %z
  %r = and i32 %x, %s
  ret i32 %r
}

define i32 @test42(i32 %x, i32 %y) {
; CHECK-LABEL: @test42(
; CHECK-NEXT:    [[COND:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = sext i1 [[COND]] to i32
; CHECK-NEXT:    [[C:%.*]] = add i32 [[B]], [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %b = add i32 %y, -1
  %cond = icmp eq i32 %x, 0
  %c = select i1 %cond, i32 %b, i32 %y
  ret i32 %c
}

define <2 x i32> @test42vec(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @test42vec(
; CHECK-NEXT:    [[COND:%.*]] = icmp eq <2 x i32> [[X:%.*]], zeroinitializer
; CHECK-NEXT:    [[B:%.*]] = sext <2 x i1> [[COND]] to <2 x i32>
; CHECK-NEXT:    [[C:%.*]] = add <2 x i32> [[B]], [[Y:%.*]]
; CHECK-NEXT:    ret <2 x i32> [[C]]
;
  %b = add <2 x i32> %y, <i32 -1, i32 -1>
  %cond = icmp eq <2 x i32> %x, zeroinitializer
  %c = select <2 x i1> %cond, <2 x i32> %b, <2 x i32> %y
  ret <2 x i32> %c
}

; PR8994

; This select instruction can't be eliminated because trying to do so would
; change the number of vector elements. This used to assert.
define i48 @test51(<3 x i1> %icmp, <3 x i16> %tmp) {
; CHECK-LABEL: @test51(
; CHECK-NEXT:    [[SELECT:%.*]] = select <3 x i1> [[ICMP:%.*]], <3 x i16> zeroinitializer, <3 x i16> [[TMP:%.*]]
; CHECK-NEXT:    [[TMP2:%.*]] = bitcast <3 x i16> [[SELECT]] to i48
; CHECK-NEXT:    ret i48 [[TMP2]]
;
  %select = select <3 x i1> %icmp, <3 x i16> zeroinitializer, <3 x i16> %tmp
  %tmp2 = bitcast <3 x i16> %select to i48
  ret i48 %tmp2
}

define <vscale x 4 x float> @bitcast_select_bitcast(<vscale x 4 x i1> %icmp, <vscale x 4 x i32> %a, <vscale x 4 x float> %b) {
; CHECK-LABEL: @bitcast_select_bitcast(
; CHECK-NEXT:    [[TMP1:%.*]] = bitcast <vscale x 4 x i32> [[A:%.*]] to <vscale x 4 x float>
; CHECK-NEXT:    [[BC2:%.*]] = select <vscale x 4 x i1> [[ICMP:%.*]], <vscale x 4 x float> [[B:%.*]], <vscale x 4 x float> [[TMP1]]
; CHECK-NEXT:    ret <vscale x 4 x float> [[BC2]]
;
  %bc1 = bitcast <vscale x 4 x float> %b to <vscale x 4 x i32>
  %select = select <vscale x 4 x i1> %icmp, <vscale x 4 x i32> %bc1, <vscale x 4 x i32> %a
  %bc2 = bitcast <vscale x 4 x i32> %select to <vscale x 4 x float>
  ret <vscale x 4 x float> %bc2
}

define void @select_oneuse_bitcast(<vscale x 4 x float> %a, <vscale x 4 x float> %b, <vscale x 4 x i32> %c, <vscale x 4 x i32> %d, <vscale x 4 x i32>* %ptr1) {
; CHECK-LABEL: @select_oneuse_bitcast(
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult <vscale x 4 x i32> [[C:%.*]], [[D:%.*]]
; CHECK-NEXT:    [[SEL1_V:%.*]] = select <vscale x 4 x i1> [[CMP]], <vscale x 4 x float> [[A:%.*]], <vscale x 4 x float> [[B:%.*]]
; CHECK-NEXT:    [[TMP1:%.*]] = bitcast <vscale x 4 x i32>* [[PTR1:%.*]] to <vscale x 4 x float>*
; CHECK-NEXT:    store <vscale x 4 x float> [[SEL1_V]], <vscale x 4 x float>* [[TMP1]], align 16
; CHECK-NEXT:    ret void
;
  %cmp = icmp ult <vscale x 4 x i32> %c, %d
  %bc1 = bitcast <vscale x 4 x float> %a to <vscale x 4 x i32>
  %bc2 = bitcast <vscale x 4 x float> %b to <vscale x 4 x i32>
  %sel1 = select <vscale x 4 x i1> %cmp, <vscale x 4 x i32> %bc1, <vscale x 4 x i32> %bc2
  store <vscale x 4 x i32> %sel1, <vscale x 4 x i32>* %ptr1
  ret void
}

; Allow select promotion even if there are multiple uses of bitcasted ops.
; Hoisting the selects allows later pattern matching to see that these are min/max ops.

define void @min_max_bitcast(<4 x float> %a, <4 x float> %b, <4 x i32>* %ptr1, <4 x i32>* %ptr2) {
; CHECK-LABEL: @min_max_bitcast(
; CHECK-NEXT:    [[CMP:%.*]] = fcmp olt <4 x float> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[SEL1_V:%.*]] = select <4 x i1> [[CMP]], <4 x float> [[A]], <4 x float> [[B]]
; CHECK-NEXT:    [[SEL2_V:%.*]] = select <4 x i1> [[CMP]], <4 x float> [[B]], <4 x float> [[A]]
; CHECK-NEXT:    [[TMP1:%.*]] = bitcast <4 x i32>* [[PTR1:%.*]] to <4 x float>*
; CHECK-NEXT:    store <4 x float> [[SEL1_V]], <4 x float>* [[TMP1]], align 16
; CHECK-NEXT:    [[TMP2:%.*]] = bitcast <4 x i32>* [[PTR2:%.*]] to <4 x float>*
; CHECK-NEXT:    store <4 x float> [[SEL2_V]], <4 x float>* [[TMP2]], align 16
; CHECK-NEXT:    ret void
;
  %cmp = fcmp olt <4 x float> %a, %b
  %bc1 = bitcast <4 x float> %a to <4 x i32>
  %bc2 = bitcast <4 x float> %b to <4 x i32>
  %sel1 = select <4 x i1> %cmp, <4 x i32> %bc1, <4 x i32> %bc2
  %sel2 = select <4 x i1> %cmp, <4 x i32> %bc2, <4 x i32> %bc1
  store <4 x i32> %sel1, <4 x i32>* %ptr1
  store <4 x i32> %sel2, <4 x i32>* %ptr2
  ret void
}

define void @min_max_bitcast1(<vscale x 4 x float> %a, <vscale x 4 x float> %b, <vscale x 4 x i32>* %ptr1, <vscale x 4 x i32>* %ptr2) {
; CHECK-LABEL: @min_max_bitcast1(
; CHECK-NEXT:    [[CMP:%.*]] = fcmp olt <vscale x 4 x float> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[SEL1_V:%.*]] = select <vscale x 4 x i1> [[CMP]], <vscale x 4 x float> [[A]], <vscale x 4 x float> [[B]]
; CHECK-NEXT:    [[SEL2_V:%.*]] = select <vscale x 4 x i1> [[CMP]], <vscale x 4 x float> [[B]], <vscale x 4 x float> [[A]]
; CHECK-NEXT:    [[TMP1:%.*]] = bitcast <vscale x 4 x i32>* [[PTR1:%.*]] to <vscale x 4 x float>*
; CHECK-NEXT:    store <vscale x 4 x float> [[SEL1_V]], <vscale x 4 x float>* [[TMP1]], align 16
; CHECK-NEXT:    [[TMP2:%.*]] = bitcast <vscale x 4 x i32>* [[PTR2:%.*]] to <vscale x 4 x float>*
; CHECK-NEXT:    store <vscale x 4 x float> [[SEL2_V]], <vscale x 4 x float>* [[TMP2]], align 16
; CHECK-NEXT:    ret void
;
  %cmp = fcmp olt <vscale x 4 x float> %a, %b
  %bc1 = bitcast <vscale x 4 x float> %a to <vscale x 4 x i32>
  %bc2 = bitcast <vscale x 4 x float> %b to <vscale x 4 x i32>
  %sel1 = select <vscale x 4 x i1> %cmp, <vscale x 4 x i32> %bc1, <vscale x 4 x i32> %bc2
  %sel2 = select <vscale x 4 x i1> %cmp, <vscale x 4 x i32> %bc2, <vscale x 4 x i32> %bc1
  store <vscale x 4 x i32> %sel1, <vscale x 4 x i32>* %ptr1
  store <vscale x 4 x i32> %sel2, <vscale x 4 x i32>* %ptr2
  ret void
}

; To avoid potential backend problems, we don't do the same transform for other casts.

define void @truncs_before_selects(<4 x float> %f1, <4 x float> %f2, <4 x i64> %a, <4 x i64> %b, <4 x i32>* %ptr1, <4 x i32>* %ptr2) {
; CHECK-LABEL: @truncs_before_selects(
; CHECK-NEXT:    [[CMP:%.*]] = fcmp olt <4 x float> [[F1:%.*]], [[F2:%.*]]
; CHECK-NEXT:    [[BC1:%.*]] = trunc <4 x i64> [[A:%.*]] to <4 x i32>
; CHECK-NEXT:    [[BC2:%.*]] = trunc <4 x i64> [[B:%.*]] to <4 x i32>
; CHECK-NEXT:    [[SEL1:%.*]] = select <4 x i1> [[CMP]], <4 x i32> [[BC1]], <4 x i32> [[BC2]]
; CHECK-NEXT:    [[SEL2:%.*]] = select <4 x i1> [[CMP]], <4 x i32> [[BC2]], <4 x i32> [[BC1]]
; CHECK-NEXT:    store <4 x i32> [[SEL1]], <4 x i32>* [[PTR1:%.*]], align 16
; CHECK-NEXT:    store <4 x i32> [[SEL2]], <4 x i32>* [[PTR2:%.*]], align 16
; CHECK-NEXT:    ret void
;
  %cmp = fcmp olt <4 x float> %f1, %f2
  %bc1 = trunc <4 x i64> %a to <4 x i32>
  %bc2 = trunc <4 x i64> %b to <4 x i32>
  %sel1 = select <4 x i1> %cmp, <4 x i32> %bc1, <4 x i32> %bc2
  %sel2 = select <4 x i1> %cmp, <4 x i32> %bc2, <4 x i32> %bc1
  store <4 x i32> %sel1, <4 x i32>* %ptr1, align 16
  store <4 x i32> %sel2, <4 x i32>* %ptr2, align 16
  ret void
}

; PR8575

define i32 @test52(i32 %n, i32 %m) {
; CHECK-LABEL: @test52(
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[N:%.*]], [[M:%.*]]
; CHECK-NEXT:    [[STOREMERGE:%.*]] = select i1 [[CMP]], i32 1, i32 6
; CHECK-NEXT:    ret i32 [[STOREMERGE]]
;
  %cmp = icmp sgt i32 %n, %m
  %. = select i1 %cmp, i32 1, i32 3
  %add = add nsw i32 %., 3
  %storemerge = select i1 %cmp, i32 %., i32 %add
  ret i32 %storemerge
}

; PR9454

define i32 @test53(i32 %x) {
; CHECK-LABEL: @test53(
; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X:%.*]], 2
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[AND]], [[X]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i32 2, i32 1
; CHECK-NEXT:    ret i32 [[SEL]]
;
  %and = and i32 %x, 2
  %cmp = icmp eq i32 %and, %x
  %sel = select i1 %cmp, i32 2, i32 1
  ret i32 %sel
}

define i32 @test54(i32 %X, i32 %Y) {
; CHECK-LABEL: @test54(
; CHECK-NEXT:    [[B:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = zext i1 [[B]] to i32
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = ashr exact i32 %X, %Y
  %B = icmp eq i32 %A, 0
  %C = select i1 %B, i32 %A, i32 1
  ret i32 %C
}

define i1 @test55(i1 %X, i32 %Y, i32 %Z) {
; CHECK-LABEL: @test55(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[Y:%.*]], 0
; CHECK-NEXT:    ret i1 [[C]]
;
  %A = ashr exact i32 %Y, %Z
  %B = select i1 %X, i32 %Y, i32 %A
  %C = icmp eq i32 %B, 0
  ret i1 %C
}

define i32 @test56(i16 %x) {
; CHECK-LABEL: @test56(
; CHECK-NEXT:    [[CONV:%.*]] = zext i16 [[X:%.*]] to i32
; CHECK-NEXT:    ret i32 [[CONV]]
;
  %tobool = icmp eq i16 %x, 0
  %conv = zext i16 %x to i32
  %cond = select i1 %tobool, i32 0, i32 %conv
  ret i32 %cond
}

define i32 @test57(i32 %x, i32 %y) {
; CHECK-LABEL: @test57(
; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[AND]]
;
  %and = and i32 %x, %y
  %tobool = icmp eq i32 %x, 0
  %.and = select i1 %tobool, i32 0, i32 %and
  ret i32 %.and
}

define i32 @test58(i16 %x) {
; CHECK-LABEL: @test58(
; CHECK-NEXT:    [[CONV:%.*]] = zext i16 [[X:%.*]] to i32
; CHECK-NEXT:    ret i32 [[CONV]]
;
  %tobool = icmp ne i16 %x, 1
  %conv = zext i16 %x to i32
  %cond = select i1 %tobool, i32 %conv, i32 1
  ret i32 %cond
}

define i32 @test59(i32 %x, i32 %y) {
; CHECK-LABEL: @test59(
; CHECK-NEXT:    [[AND:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[AND]]
;
  %and = and i32 %x, %y
  %tobool = icmp ne i32 %x, %y
  %.and = select i1 %tobool, i32 %and, i32 %y
  ret i32 %.and
}

define i1 @test60(i32 %x, i1* %y) {
; CHECK-LABEL: @test60(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[LOAD:%.*]] = load i1, i1* [[Y:%.*]], align 1
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i32 [[X]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i1 [[LOAD]], i1 [[CMP1]]
; CHECK-NEXT:    ret i1 [[SEL]]
;
  %cmp = icmp eq i32 %x, 0
  %load = load i1, i1* %y, align 1
  %cmp1 = icmp slt i32 %x, 1
  %sel = select i1 %cmp, i1 %load, i1 %cmp1
  ret i1 %sel
}

@glbl = constant i32 10
define i32 @test61(i32* %ptr) {
; CHECK-LABEL: @test61(
; CHECK-NEXT:    ret i32 10
;
  %A = load i32, i32* %ptr
  %B = icmp eq i32* %ptr, @glbl
  %C = select i1 %B, i32 %A, i32 10
  ret i32 %C
}

; PR14131
define void @test64(i32 %p, i16 %b) noreturn {
; CHECK-LABEL: @test64(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 undef, label [[LOR_RHS:%.*]], label [[LOR_END:%.*]]
; CHECK:       lor.rhs:
; CHECK-NEXT:    br label [[LOR_END]]
; CHECK:       lor.end:
; CHECK-NEXT:    br i1 true, label [[COND_END17:%.*]], label [[COND_FALSE16:%.*]]
; CHECK:       cond.false16:
; CHECK-NEXT:    br label [[COND_END17]]
; CHECK:       cond.end17:
; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
; CHECK:       while.body:
; CHECK-NEXT:    br label [[WHILE_BODY]]
;
entry:
  %p.addr.0.insert.mask = and i32 %p, -65536
  %conv2 = and i32 %p, 65535
  br i1 undef, label %lor.rhs, label %lor.end

lor.rhs:
  %p.addr.0.extract.trunc = trunc i32 %p.addr.0.insert.mask to i16
  %phitmp = zext i16 %p.addr.0.extract.trunc to i32
  br label %lor.end

lor.end:
  %t.1 = phi i32 [ 0, %entry ], [ %phitmp, %lor.rhs ]
  %conv6 = zext i16 %b to i32
  %div = udiv i32 %conv6, %t.1
  %tobool8 = icmp eq i32 %div, 0
  %cmp = icmp eq i32 %t.1, 0
  %cmp12 = icmp ult i32 %conv2, 2
  %cmp.sink = select i1 %tobool8, i1 %cmp12, i1 %cmp
  br i1 %cmp.sink, label %cond.end17, label %cond.false16

cond.false16:
  br label %cond.end17

cond.end17:
  br label %while.body

while.body:
  br label %while.body
}

@under_aligned = external global i32, align 1

; The load here must not be speculated around the select. One side of the
; select is trivially dereferenceable but may have a lower alignment than the
; load does.
define i32 @test76(i1 %flag, i32* %x) {
; CHECK-LABEL: @test76(
; CHECK-NEXT:    store i32 0, i32* [[X:%.*]], align 4
; CHECK-NEXT:    [[P:%.*]] = select i1 [[FLAG:%.*]], i32* @under_aligned, i32* [[X]]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  store i32 0, i32* %x
  %p = select i1 %flag, i32* @under_aligned, i32* %x
  %v = load i32, i32* %p
  ret i32 %v
}

declare void @scribble_on_i32(i32*)

; The load here must not be speculated around the select. One side of the
; select is trivially dereferenceable but may have a lower alignment than the
; load does.

define i32 @test77(i1 %flag, i32* %x) {
; CHECK-LABEL: @test77(
; CHECK-NEXT:    [[UNDER_ALIGNED:%.*]] = alloca i32, align 1
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[UNDER_ALIGNED]])
; CHECK-NEXT:    store i32 0, i32* [[X:%.*]], align 4
; CHECK-NEXT:    [[P:%.*]] = select i1 [[FLAG:%.*]], i32* [[UNDER_ALIGNED]], i32* [[X]]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %under_aligned = alloca i32, align 1
  call void @scribble_on_i32(i32* %under_aligned)
  store i32 0, i32* %x
  %p = select i1 %flag, i32* %under_aligned, i32* %x
  %v = load i32, i32* %p
  ret i32 %v
}

define i32 @test78(i1 %flag, i32* %x, i32* %y, i32* %z) {
; Test that we can speculate the loads around the select even when we can't
; fold the load completely away.
; CHECK-LABEL: @test78(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 0, i32* [[X:%.*]], align 4
; CHECK-NEXT:    store i32 0, i32* [[Y:%.*]], align 4
; CHECK-NEXT:    store i32 42, i32* [[Z:%.*]], align 4
; CHECK-NEXT:    [[X_VAL:%.*]] = load i32, i32* [[X]], align 4
; CHECK-NEXT:    [[Y_VAL:%.*]] = load i32, i32* [[Y]], align 4
; CHECK-NEXT:    [[V:%.*]] = select i1 [[FLAG:%.*]], i32 [[X_VAL]], i32 [[Y_VAL]]
; CHECK-NEXT:    ret i32 [[V]]
;
entry:
  store i32 0, i32* %x
  store i32 0, i32* %y
  ; Block forwarding by storing to %z which could alias either %x or %y.
  store i32 42, i32* %z
  %p = select i1 %flag, i32* %x, i32* %y
  %v = load i32, i32* %p
  ret i32 %v
}

; Test that we can speculate the loads around the select even when we can't
; fold the load completely away.
define i32 @test78_deref(i1 %flag, i32* dereferenceable(4) align 4 %x, i32* dereferenceable(4) align 4 %y, i32* %z) {
; CHECK-LABEL: @test78_deref(
; CHECK-NEXT:    [[X_VAL:%.*]] = load i32, i32* [[X:%.*]], align 4
; CHECK-NEXT:    [[Y_VAL:%.*]] = load i32, i32* [[Y:%.*]], align 4
; CHECK-NEXT:    [[V:%.*]] = select i1 [[FLAG:%.*]], i32 [[X_VAL]], i32 [[Y_VAL]]
; CHECK-NEXT:    ret i32 [[V]]
;
  %p = select i1 %flag, i32* %x, i32* %y
  %v = load i32, i32* %p
  ret i32 %v
}

; The same as @test78 but we can't speculate the load because it can trap
; if under-aligned.
define i32 @test78_neg(i1 %flag, i32* %x, i32* %y, i32* %z) {
; CHECK-LABEL: @test78_neg(
; CHECK-NEXT:    store i32 0, i32* [[X:%.*]], align 4
; CHECK-NEXT:    store i32 0, i32* [[Y:%.*]], align 4
; CHECK-NEXT:    store i32 42, i32* [[Z:%.*]], align 4
; CHECK-NEXT:    [[P:%.*]] = select i1 [[FLAG:%.*]], i32* [[X]], i32* [[Y]]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P]], align 16
; CHECK-NEXT:    ret i32 [[V]]
;
  store i32 0, i32* %x
  store i32 0, i32* %y
  ; Block forwarding by storing to %z which could alias either %x or %y.
  store i32 42, i32* %z
  %p = select i1 %flag, i32* %x, i32* %y
  %v = load i32, i32* %p, align 16
  ret i32 %v
}

; The same as @test78_deref but we can't speculate the load because
; one of the arguments is not sufficiently dereferenceable.
define i32 @test78_deref_neg(i1 %flag, i32* dereferenceable(2) %x, i32* dereferenceable(4) %y, i32* %z) {
; CHECK-LABEL: @test78_deref_neg(
; CHECK-NEXT:    [[P:%.*]] = select i1 [[FLAG:%.*]], i32* [[X:%.*]], i32* [[Y:%.*]]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  %p = select i1 %flag, i32* %x, i32* %y
  %v = load i32, i32* %p
  ret i32 %v
}

; Test that we can speculate the loads around the select even when we can't
; fold the load completely away.
define float @test79(i1 %flag, float* %x, i32* %y, i32* %z) {
; CHECK-LABEL: @test79(
; CHECK-NEXT:    [[X1:%.*]] = bitcast float* [[X:%.*]] to i32*
; CHECK-NEXT:    [[Y1:%.*]] = bitcast i32* [[Y:%.*]] to float*
; CHECK-NEXT:    store i32 0, i32* [[X1]], align 4
; CHECK-NEXT:    store i32 0, i32* [[Y]], align 4
; CHECK-NEXT:    store i32 42, i32* [[Z:%.*]], align 4
; CHECK-NEXT:    [[X_VAL:%.*]] = load float, float* [[X]], align 4
; CHECK-NEXT:    [[Y1_VAL:%.*]] = load float, float* [[Y1]], align 4
; CHECK-NEXT:    [[V:%.*]] = select i1 [[FLAG:%.*]], float [[X_VAL]], float [[Y1_VAL]]
; CHECK-NEXT:    ret float [[V]]
;
  %x1 = bitcast float* %x to i32*
  %y1 = bitcast i32* %y to float*
  store i32 0, i32* %x1
  store i32 0, i32* %y
  ; Block forwarding by storing to %z which could alias either %x or %y.
  store i32 42, i32* %z
  %p = select i1 %flag, float* %x, float* %y1
  %v = load float, float* %p
  ret float %v
}

; Test that when we speculate the loads around the select they fold throug
; load->load folding and load->store folding.
define i32 @test80(i1 %flag) {
; CHECK-LABEL: @test80(
; CHECK-NEXT:    [[X:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[Y:%.*]] = alloca i32, align 4
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[X]])
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[Y]])
; CHECK-NEXT:    [[TMP:%.*]] = load i32, i32* [[X]], align 4
; CHECK-NEXT:    store i32 [[TMP]], i32* [[Y]], align 4
; CHECK-NEXT:    ret i32 [[TMP]]
;
  %x = alloca i32
  %y = alloca i32
  call void @scribble_on_i32(i32* %x)
  call void @scribble_on_i32(i32* %y)
  %tmp = load i32, i32* %x
  store i32 %tmp, i32* %y
  %p = select i1 %flag, i32* %x, i32* %y
  %v = load i32, i32* %p
  ret i32 %v
}

; Test that we can speculate the load around the select even though they use
; differently typed pointers.
define float @test81(i1 %flag) {
; CHECK-LABEL: @test81(
; CHECK-NEXT:    [[X:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[Y:%.*]] = alloca i32, align 4
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[X]])
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[Y]])
; CHECK-NEXT:    [[TMP:%.*]] = load i32, i32* [[X]], align 4
; CHECK-NEXT:    store i32 [[TMP]], i32* [[Y]], align 4
; CHECK-NEXT:    [[V:%.*]] = bitcast i32 [[TMP]] to float
; CHECK-NEXT:    ret float [[V]]
;
  %x = alloca float
  %y = alloca i32
  %x1 = bitcast float* %x to i32*
  %y1 = bitcast i32* %y to float*
  call void @scribble_on_i32(i32* %x1)
  call void @scribble_on_i32(i32* %y)
  %tmp = load i32, i32* %x1
  store i32 %tmp, i32* %y
  %p = select i1 %flag, float* %x, float* %y1
  %v = load float, float* %p
  ret float %v
}

; Test that we can speculate the load around the select even though they use
; differently typed pointers.
define i32 @test82(i1 %flag) {
; CHECK-LABEL: @test82(
; CHECK-NEXT:    [[X:%.*]] = alloca float, align 4
; CHECK-NEXT:    [[Y:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[X1:%.*]] = bitcast float* [[X]] to i32*
; CHECK-NEXT:    [[Y1:%.*]] = bitcast i32* [[Y]] to float*
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[X1]])
; CHECK-NEXT:    call void @scribble_on_i32(i32* nonnull [[Y]])
; CHECK-NEXT:    [[TMP:%.*]] = load float, float* [[X]], align 4
; CHECK-NEXT:    store float [[TMP]], float* [[Y1]], align 4
; CHECK-NEXT:    [[V:%.*]] = bitcast float [[TMP]] to i32
; CHECK-NEXT:    ret i32 [[V]]
;
  %x = alloca float
  %y = alloca i32
  %x1 = bitcast float* %x to i32*
  %y1 = bitcast i32* %y to float*
  call void @scribble_on_i32(i32* %x1)
  call void @scribble_on_i32(i32* %y)
  %tmp = load float, float* %x
  store float %tmp, float* %y1
  %p = select i1 %flag, i32* %x1, i32* %y
  %v = load i32, i32* %p
  ret i32 %v
}

declare void @scribble_on_i64(i64*)
declare void @scribble_on_i128(i128*)

; Test that we can speculate the load around the select even though they use
; differently typed pointers and requires inttoptr casts.
define i8* @test83(i1 %flag) {
; CHECK-LABEL: @test83(
; CHECK-NEXT:    [[X:%.*]] = alloca i8*, align 8
; CHECK-NEXT:    [[Y:%.*]] = alloca i8*, align 8
; CHECK-NEXT:    [[TMPCAST:%.*]] = bitcast i8** [[Y]] to i64*
; CHECK-NEXT:    [[X1:%.*]] = bitcast i8** [[X]] to i64*
; CHECK-NEXT:    call void @scribble_on_i64(i64* nonnull [[X1]])
; CHECK-NEXT:    call void @scribble_on_i64(i64* nonnull [[TMPCAST]])
; CHECK-NEXT:    [[TMP:%.*]] = load i64, i64* [[X1]], align 8
; CHECK-NEXT:    store i64 [[TMP]], i64* [[TMPCAST]], align 8
; CHECK-NEXT:    [[V:%.*]] = inttoptr i64 [[TMP]] to i8*
; CHECK-NEXT:    ret i8* [[V]]
;
  %x = alloca i8*
  %y = alloca i64
  %x1 = bitcast i8** %x to i64*
  %y1 = bitcast i64* %y to i8**
  call void @scribble_on_i64(i64* %x1)
  call void @scribble_on_i64(i64* %y)
  %tmp = load i64, i64* %x1
  store i64 %tmp, i64* %y
  %p = select i1 %flag, i8** %x, i8** %y1
  %v = load i8*, i8** %p
  ret i8* %v
}

; Test that we can speculate the load around the select even though they use
; differently typed pointers and requires a ptrtoint cast.
define i64 @test84(i1 %flag) {
; CHECK-LABEL: @test84(
; CHECK-NEXT:    [[X:%.*]] = alloca i8*, align 8
; CHECK-NEXT:    [[Y:%.*]] = alloca i8*, align 8
; CHECK-NEXT:    [[TMPCAST:%.*]] = bitcast i8** [[Y]] to i64*
; CHECK-NEXT:    [[X1:%.*]] = bitcast i8** [[X]] to i64*
; CHECK-NEXT:    call void @scribble_on_i64(i64* nonnull [[X1]])
; CHECK-NEXT:    call void @scribble_on_i64(i64* nonnull [[TMPCAST]])
; CHECK-NEXT:    [[TMP:%.*]] = load i8*, i8** [[X]], align 8
; CHECK-NEXT:    store i8* [[TMP]], i8** [[Y]], align 8
; CHECK-NEXT:    [[V:%.*]] = ptrtoint i8* [[TMP]] to i64
; CHECK-NEXT:    ret i64 [[V]]
;
  %x = alloca i8*
  %y = alloca i64
  %x1 = bitcast i8** %x to i64*
  %y1 = bitcast i64* %y to i8**
  call void @scribble_on_i64(i64* %x1)
  call void @scribble_on_i64(i64* %y)
  %tmp = load i8*, i8** %x
  store i8* %tmp, i8** %y1
  %p = select i1 %flag, i64* %x1, i64* %y
  %v = load i64, i64* %p
  ret i64 %v
}

; Test that we can't speculate the load around the select. The load of the
; pointer doesn't load all of the stored integer bits. We could fix this, but it
; would require endianness checks and other nastiness.
define i8* @test85(i1 %flag) {
; CHECK-LABEL: @test85(
; CHECK-NEXT:    [[X1:%.*]] = alloca [2 x i8*], align 8
; CHECK-NEXT:    [[Y:%.*]] = alloca i128, align 8
; CHECK-NEXT:    [[X1_SUB:%.*]] = getelementptr inbounds [2 x i8*], [2 x i8*]* [[X1]], i64 0, i64 0
; CHECK-NEXT:    [[X2:%.*]] = bitcast [2 x i8*]* [[X1]] to i128*
; CHECK-NEXT:    [[Y1:%.*]] = bitcast i128* [[Y]] to i8**
; CHECK-NEXT:    call void @scribble_on_i128(i128* nonnull [[X2]])
; CHECK-NEXT:    call void @scribble_on_i128(i128* nonnull [[Y]])
; CHECK-NEXT:    [[TMP:%.*]] = load i128, i128* [[X2]], align 8
; CHECK-NEXT:    store i128 [[TMP]], i128* [[Y]], align 8
; CHECK-NEXT:    [[X1_SUB_VAL:%.*]] = load i8*, i8** [[X1_SUB]], align 8
; CHECK-NEXT:    [[Y1_VAL:%.*]] = load i8*, i8** [[Y1]], align 8
; CHECK-NEXT:    [[V:%.*]] = select i1 [[FLAG:%.*]], i8* [[X1_SUB_VAL]], i8* [[Y1_VAL]]
; CHECK-NEXT:    ret i8* [[V]]
;
  %x = alloca [2 x i8*]
  %y = alloca i128
  %x1 = bitcast [2 x i8*]* %x to i8**
  %x2 = bitcast i8** %x1 to i128*
  %y1 = bitcast i128* %y to i8**
  call void @scribble_on_i128(i128* %x2)
  call void @scribble_on_i128(i128* %y)
  %tmp = load i128, i128* %x2
  store i128 %tmp, i128* %y
  %p = select i1 %flag, i8** %x1, i8** %y1
  %v = load i8*, i8** %p
  ret i8* %v
}

; Test that we can't speculate the load around the select when the integer size
; is larger than the pointer size. The store of the pointer doesn't store to all
; the bits of the integer.
define i128 @test86(i1 %flag) {
; CHECK-LABEL: @test86(
; CHECK-NEXT:    [[X1:%.*]] = alloca [2 x i8*], align 8
; CHECK-NEXT:    [[Y:%.*]] = alloca i128, align 8
; CHECK-NEXT:    [[X1_SUB:%.*]] = getelementptr inbounds [2 x i8*], [2 x i8*]* [[X1]], i64 0, i64 0
; CHECK-NEXT:    [[X2:%.*]] = bitcast [2 x i8*]* [[X1]] to i128*
; CHECK-NEXT:    [[Y1:%.*]] = bitcast i128* [[Y]] to i8**
; CHECK-NEXT:    call void @scribble_on_i128(i128* nonnull [[X2]])
; CHECK-NEXT:    call void @scribble_on_i128(i128* nonnull [[Y]])
; CHECK-NEXT:    [[TMP:%.*]] = load i8*, i8** [[X1_SUB]], align 8
; CHECK-NEXT:    store i8* [[TMP]], i8** [[Y1]], align 8
; CHECK-NEXT:    [[X2_VAL:%.*]] = load i128, i128* [[X2]], align 8
; CHECK-NEXT:    [[Y_VAL:%.*]] = load i128, i128* [[Y]], align 8
; CHECK-NEXT:    [[V:%.*]] = select i1 [[FLAG:%.*]], i128 [[X2_VAL]], i128 [[Y_VAL]]
; CHECK-NEXT:    ret i128 [[V]]
;
  %x = alloca [2 x i8*]
  %y = alloca i128
  %x1 = bitcast [2 x i8*]* %x to i8**
  %x2 = bitcast i8** %x1 to i128*
  %y1 = bitcast i128* %y to i8**
  call void @scribble_on_i128(i128* %x2)
  call void @scribble_on_i128(i128* %y)
  %tmp = load i8*, i8** %x1
  store i8* %tmp, i8** %y1
  %p = select i1 %flag, i128* %x2, i128* %y
  %v = load i128, i128* %p
  ret i128 %v
}

define i32 @test_select_select0(i32 %a, i32 %r0, i32 %r1, i32 %v1, i32 %v2) {
; CHECK-LABEL: @test_select_select0(
; CHECK-NEXT:    [[C0_NOT:%.*]] = icmp slt i32 [[A:%.*]], [[V1:%.*]]
; CHECK-NEXT:    [[S0:%.*]] = select i1 [[C0_NOT]], i32 [[R1:%.*]], i32 [[R0:%.*]]
; CHECK-NEXT:    [[C1:%.*]] = icmp slt i32 [[A]], [[V2:%.*]]
; CHECK-NEXT:    [[S1:%.*]] = select i1 [[C1]], i32 [[S0]], i32 [[R1]]
; CHECK-NEXT:    ret i32 [[S1]]
;
  %c0 = icmp sge i32 %a, %v1
  %s0 = select i1 %c0, i32 %r0, i32 %r1
  %c1 = icmp slt i32 %a, %v2
  %s1 = select i1 %c1, i32 %s0, i32 %r1
  ret i32 %s1
}

define i32 @test_select_select1(i32 %a, i32 %r0, i32 %r1, i32 %v1, i32 %v2) {
; CHECK-LABEL: @test_select_select1(
; CHECK-NEXT:    [[C0_NOT:%.*]] = icmp slt i32 [[A:%.*]], [[V1:%.*]]
; CHECK-NEXT:    [[S0:%.*]] = select i1 [[C0_NOT]], i32 [[R1:%.*]], i32 [[R0:%.*]]
; CHECK-NEXT:    [[C1:%.*]] = icmp slt i32 [[A]], [[V2:%.*]]
; CHECK-NEXT:    [[S1:%.*]] = select i1 [[C1]], i32 [[R0]], i32 [[S0]]
; CHECK-NEXT:    ret i32 [[S1]]
;
  %c0 = icmp sge i32 %a, %v1
  %s0 = select i1 %c0, i32 %r0, i32 %r1
  %c1 = icmp slt i32 %a, %v2
  %s1 = select i1 %c1, i32 %r0, i32 %s0
  ret i32 %s1
}

define i32 @PR23757(i32 %x) {
; CHECK-LABEL: @PR23757(
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[X:%.*]], 1
; CHECK-NEXT:    ret i32 [[ADD]]
;
  %cmp = icmp eq i32 %x, 2147483647
  %add = add nsw i32 %x, 1
  %sel = select i1 %cmp, i32 -2147483648, i32 %add
  ret i32 %sel
}

define i32 @PR23757_swapped(i32 %x) {
; CHECK-LABEL: @PR23757_swapped(
; CHECK-NEXT:    ret i32 -2147483648
;
  %cmp = icmp eq i32 %x, 2147483647
  %add = add nsw i32 %x, 1
  %sel = select i1 %cmp, i32 %add, i32 -2147483648
  ret i32 %sel
}

define i32 @PR23757_ne(i32 %x, i1* %p) {
; CHECK-LABEL: @PR23757_ne(
; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[X:%.*]], 2147483647
; CHECK-NEXT:    store i1 [[CMP]], i1* [[P:%.*]], align 1
; CHECK-NEXT:    ret i32 -2147483648
;
  %cmp = icmp ne i32 %x, 2147483647
  store i1 %cmp, i1* %p ; thwart predicate canonicalization
  %add = add nsw i32 %x, 1
  %sel = select i1 %cmp, i32 -2147483648, i32 %add
  ret i32 %sel
}

define i32 @PR23757_ne_swapped(i32 %x, i1* %p) {
; CHECK-LABEL: @PR23757_ne_swapped(
; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[X:%.*]], 2147483647
; CHECK-NEXT:    store i1 [[CMP]], i1* [[P:%.*]], align 1
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[X]], 1
; CHECK-NEXT:    ret i32 [[ADD]]
;
  %cmp = icmp ne i32 %x, 2147483647
  store i1 %cmp, i1* %p ; thwart predicate canonicalization
  %add = add nsw i32 %x, 1
  %sel = select i1 %cmp, i32 %add, i32 -2147483648
  ret i32 %sel
}

; max(max(~a, -1), -1) --> ~min(a, 0)

define i32 @PR27137(i32 %a) {
; CHECK-LABEL: @PR27137(
; CHECK-NEXT:    [[TMP1:%.*]] = icmp slt i32 [[A:%.*]], 0
; CHECK-NEXT:    [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[A]], i32 0
; CHECK-NEXT:    [[S1:%.*]] = xor i32 [[TMP2]], -1
; CHECK-NEXT:    ret i32 [[S1]]
;
  %not_a = xor i32 %a, -1
  %c0 = icmp slt i32 %a, 0
  %s0 = select i1 %c0, i32 %not_a, i32 -1
  %c1 = icmp sgt i32 %s0, -1
  %s1 = select i1 %c1, i32 %s0, i32 -1
  ret i32 %s1
}

; ub-safe negation pattern
define i32 @PR27817(i32 %x) {
; CHECK-LABEL: @PR27817(
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT:    ret i32 [[SUB]]
;
  %cmp = icmp eq i32 %x, -2147483648
  %sub = sub i32 0, %x
  %sel = select i1 %cmp, i32 -2147483648, i32 %sub
  ret i32 %sel
}

define i32 @PR27817_nsw(i32 %x) {
; CHECK-LABEL: @PR27817_nsw(
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT:    ret i32 [[SUB]]
;
  %cmp = icmp eq i32 %x, -2147483648
  %sub = sub nsw i32 0, %x
  %sel = select i1 %cmp, i32 -2147483648, i32 %sub
  ret i32 %sel
}

define i32 @select_icmp_slt0_xor(i32 %x) {
; CHECK-LABEL: @select_icmp_slt0_xor(
; CHECK-NEXT:    [[TMP1:%.*]] = or i32 [[X:%.*]], -2147483648
; CHECK-NEXT:    ret i32 [[TMP1]]
;
  %cmp = icmp slt i32 %x, zeroinitializer
  %xor = xor i32 %x, 2147483648
  %x.xor = select i1 %cmp, i32 %x, i32 %xor
  ret i32 %x.xor
}

define <2 x i32> @select_icmp_slt0_xor_vec(<2 x i32> %x) {
; CHECK-LABEL: @select_icmp_slt0_xor_vec(
; CHECK-NEXT:    [[TMP1:%.*]] = or <2 x i32> [[X:%.*]], <i32 -2147483648, i32 -2147483648>
; CHECK-NEXT:    ret <2 x i32> [[TMP1]]
;
  %cmp = icmp slt <2 x i32> %x, zeroinitializer
  %xor = xor <2 x i32> %x, <i32 2147483648, i32 2147483648>
  %x.xor = select <2 x i1> %cmp, <2 x i32> %x, <2 x i32> %xor
  ret <2 x i32> %x.xor
}

define <4 x i32> @canonicalize_to_shuffle(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @canonicalize_to_shuffle(
; CHECK-NEXT:    [[SEL:%.*]] = shufflevector <4 x i32> [[A:%.*]], <4 x i32> [[B:%.*]], <4 x i32> <i32 0, i32 5, i32 6, i32 3>
; CHECK-NEXT:    ret <4 x i32> [[SEL]]
;
  %sel = select <4 x i1> <i1 true, i1 false, i1 false, i1 true>, <4 x i32> %a, <4 x i32> %b
  ret <4 x i32> %sel
}

; Undef elements of the select condition may not be translated into undef elements of a shuffle mask
; because undef in a shuffle mask means we can return anything, not just one of the selected values.
; https://bugs.llvm.org/show_bug.cgi?id=32486

define <4 x i32> @undef_elts_in_condition(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @undef_elts_in_condition(
; CHECK-NEXT:    [[SEL:%.*]] = select <4 x i1> <i1 true, i1 undef, i1 false, i1 undef>, <4 x i32> [[A:%.*]], <4 x i32> [[B:%.*]]
; CHECK-NEXT:    ret <4 x i32> [[SEL]]
;
  %sel = select <4 x i1> <i1 true, i1 undef, i1 false, i1 undef>, <4 x i32> %a, <4 x i32> %b
  ret <4 x i32> %sel
}

; Don't die or try if the condition mask is a constant expression or contains a constant expression.

@g = global i32 0

define <4 x i32> @cannot_canonicalize_to_shuffle1(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @cannot_canonicalize_to_shuffle1(
; CHECK-NEXT:    [[SEL:%.*]] = select <4 x i1> bitcast (i4 ptrtoint (i32* @g to i4) to <4 x i1>), <4 x i32> [[A:%.*]], <4 x i32> [[B:%.*]]
; CHECK-NEXT:    ret <4 x i32> [[SEL]]
;
  %sel = select <4 x i1> bitcast (i4 ptrtoint (i32* @g to i4) to <4 x i1>), <4 x i32> %a, <4 x i32> %b
  ret <4 x i32> %sel
}

define <4 x i32> @cannot_canonicalize_to_shuffle2(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @cannot_canonicalize_to_shuffle2(
; CHECK-NEXT:    [[SEL:%.*]] = select <4 x i1> <i1 true, i1 undef, i1 false, i1 icmp sle (i16 ptrtoint (i32* @g to i16), i16 4)>, <4 x i32> [[A:%.*]], <4 x i32> [[B:%.*]]
; CHECK-NEXT:    ret <4 x i32> [[SEL]]
;
  %sel = select <4 x i1> <i1 true, i1 undef, i1 false, i1 icmp sle (i16 ptrtoint (i32* @g to i16), i16 4)>, <4 x i32> %a, <4 x i32> %b
  ret <4 x i32> %sel
}

declare void @llvm.assume(i1)

define i8 @assume_cond_true(i1 %cond, i8 %x, i8 %y) {
; CHECK-LABEL: @assume_cond_true(
; CHECK-NEXT:    call void @llvm.assume(i1 [[COND:%.*]])
; CHECK-NEXT:    ret i8 [[X:%.*]]
;
  call void @llvm.assume(i1 %cond)
  %sel = select i1 %cond, i8 %x, i8 %y
  ret i8 %sel
}

; computeKnownBitsFromAssume() understands the 'not' of an assumed condition.

define i8 @assume_cond_false(i1 %cond, i8 %x, i8 %y) {
; CHECK-LABEL: @assume_cond_false(
; CHECK-NEXT:    [[NOTCOND:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT:    call void @llvm.assume(i1 [[NOTCOND]])
; CHECK-NEXT:    ret i8 [[Y:%.*]]
;
  %notcond = xor i1 %cond, true
  call void @llvm.assume(i1 %notcond)
  %sel = select i1 %cond, i8 %x, i8 %y
  ret i8 %sel
}

; Test case to make sure we don't consider an all ones float values for converting the select into a sext.
define <4 x float> @PR33721(<4 x float> %w) {
; CHECK-LABEL: @PR33721(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = fcmp ole <4 x float> [[W:%.*]], zeroinitializer
; CHECK-NEXT:    [[TMP1:%.*]] = select <4 x i1> [[TMP0]], <4 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, <4 x float> zeroinitializer
; CHECK-NEXT:    ret <4 x float> [[TMP1]]
;
entry:
  %0 = fcmp ole <4 x float> %w, zeroinitializer
  %1 = select <4 x i1> %0, <4 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, <4 x float> zeroinitializer
  ret <4 x float> %1
}

; select(C, binop(select(C, X, Y), W), Z) -> select(C, binop(X, W), Z)
define i8 @test87(i1 %cond, i8 %w, i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @test87(
; CHECK-NEXT:    [[B:%.*]] = add i8 [[X:%.*]], [[W:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[COND:%.*]], i8 [[B]], i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[C]]
;
  %a = select i1 %cond, i8 %x, i8 %y
  %b = add i8 %a, %w
  %c = select i1 %cond, i8 %b, i8 %z
  ret i8 %c
}

; select(C, binop(select(C, X, Y), W), Z) -> select(C, Z, binop(Y, W))
define i8 @test88(i1 %cond, i8 %w, i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @test88(
; CHECK-NEXT:    [[B:%.*]] = sub i8 [[Y:%.*]], [[W:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[COND:%.*]], i8 [[Z:%.*]], i8 [[B]]
; CHECK-NEXT:    ret i8 [[C]]
;
  %a = select i1 %cond, i8 %x, i8 %y
  %b = sub i8 %a, %w
  %c = select i1 %cond, i8 %z, i8 %b
  ret i8 %c
}

; select(C, Z, binop(W, select(C, X, Y))) -> select(C, binop(X, W), Z)
define i8 @test89(i1 %cond, i8 %w, i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @test89(
; CHECK-NEXT:    [[B:%.*]] = and i8 [[X:%.*]], [[W:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[COND:%.*]], i8 [[B]], i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[C]]
;
  %a = select i1 %cond, i8 %x, i8 %y
  %b = and i8 %w, %a
  %c = select i1 %cond, i8 %b, i8 %z
  ret i8 %c
}

; select(C, Z, binop(W, select(C, X, Y))) -> select(C, Z, binop(W, Y))
define i8 @test90(i1 %cond, i8 %w, i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @test90(
; CHECK-NEXT:    [[B:%.*]] = or i8 [[Y:%.*]], [[W:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[COND:%.*]], i8 [[Z:%.*]], i8 [[B]]
; CHECK-NEXT:    ret i8 [[C]]
;
  %a = select i1 %cond, i8 %x, i8 %y
  %b = or i8 %w, %a
  %c = select i1 %cond, i8 %z, i8 %b
  ret i8 %c
}

define i32 @test_shl_zext_bool(i1 %t) {
; CHECK-LABEL: @test_shl_zext_bool(
; CHECK-NEXT:    [[R:%.*]] = select i1 [[T:%.*]], i32 4, i32 0
; CHECK-NEXT:    ret i32 [[R]]
;
  %r = select i1 %t, i32 4, i32 0
  ret i32 %r
}

define <2 x i32> @test_shl_zext_bool_splat(<2 x i1> %t) {
; CHECK-LABEL: @test_shl_zext_bool_splat(
; CHECK-NEXT:    [[R:%.*]] = select <2 x i1> [[T:%.*]], <2 x i32> <i32 8, i32 8>, <2 x i32> zeroinitializer
; CHECK-NEXT:    ret <2 x i32> [[R]]
;
  %r = select <2 x i1> %t, <2 x i32> <i32 8, i32 8>, <2 x i32> zeroinitializer
  ret <2 x i32> %r
}

define <2 x i32> @test_shl_zext_bool_vec(<2 x i1> %t) {
; CHECK-LABEL: @test_shl_zext_bool_vec(
; CHECK-NEXT:    [[R:%.*]] = select <2 x i1> [[T:%.*]], <2 x i32> <i32 4, i32 8>, <2 x i32> zeroinitializer
; CHECK-NEXT:    ret <2 x i32> [[R]]
;
  %r = select <2 x i1> %t, <2 x i32> <i32 4, i32 8>, <2 x i32> zeroinitializer
  ret <2 x i32> %r
}

define float @copysign1(float %x) {
; CHECK-LABEL: @copysign1(
; CHECK-NEXT:    [[R:%.*]] = call float @llvm.copysign.f32(float 1.000000e+00, float [[X:%.*]])
; CHECK-NEXT:    ret float [[R]]
;
  %i = bitcast float %x to i32
  %ispos = icmp sgt i32 %i, -1
  %r = select i1 %ispos, float 1.0, float -1.0
  ret float %r
}

define <2 x float> @copysign2(<2 x float> %x) {
; CHECK-LABEL: @copysign2(
; CHECK-NEXT:    [[TMP1:%.*]] = fneg nsz <2 x float> [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = call nsz <2 x float> @llvm.copysign.v2f32(<2 x float> <float 4.200000e+01, float 4.200000e+01>, <2 x float> [[TMP1]])
; CHECK-NEXT:    ret <2 x float> [[R]]
;
  %i = bitcast <2 x float> %x to <2 x i32>
  %isneg = icmp slt <2 x i32> %i, zeroinitializer
  %r = select nsz <2 x i1> %isneg, <2 x float> <float 42.0, float 42.0>, <2 x float> <float -42.0, float -42.0>
  ret <2 x float> %r
}

define float @copysign3(float %x) {
; CHECK-LABEL: @copysign3(
; CHECK-NEXT:    [[TMP1:%.*]] = fneg fast float [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = call fast float @llvm.copysign.f32(float 4.300000e+01, float [[TMP1]])
; CHECK-NEXT:    ret float [[R]]
;
  %i = bitcast float %x to i32
  %ispos = icmp ult i32 %i, 2147483648
  %r = select fast i1 %ispos, float -43.0, float 43.0
  ret float %r
}

; TODO: Allow undefs when matching vectors.

define <2 x float> @copysign4(<2 x float> %x) {
; CHECK-LABEL: @copysign4(
; CHECK-NEXT:    [[I:%.*]] = bitcast <2 x float> [[X:%.*]] to <2 x i32>
; CHECK-NEXT:    [[ISNEG:%.*]] = icmp slt <2 x i32> [[I]], zeroinitializer
; CHECK-NEXT:    [[R:%.*]] = select nnan arcp <2 x i1> [[ISNEG]], <2 x float> <float 4.200000e+01, float undef>, <2 x float> <float -4.200000e+01, float -4.200000e+01>
; CHECK-NEXT:    ret <2 x float> [[R]]
;
  %i = bitcast <2 x float> %x to <2 x i32>
  %isneg = icmp ugt <2 x i32> %i, <i32 2147483647, i32 2147483647>
  %r = select arcp nnan <2 x i1> %isneg, <2 x float> <float 42.0, float undef>, <2 x float> <float -42.0, float -42.0>
  ret <2 x float> %r
}

declare void @use1(i1)

; Negative test

define float @copysign_extra_use(float %x) {
; CHECK-LABEL: @copysign_extra_use(
; CHECK-NEXT:    [[I:%.*]] = bitcast float [[X:%.*]] to i32
; CHECK-NEXT:    [[ISNEG:%.*]] = icmp slt i32 [[I]], 0
; CHECK-NEXT:    call void @use1(i1 [[ISNEG]])
; CHECK-NEXT:    [[R:%.*]] = select i1 [[ISNEG]], float -4.400000e+01, float 4.400000e+01
; CHECK-NEXT:    ret float [[R]]
;
  %i = bitcast float %x to i32
  %isneg = icmp ugt i32 %i, 2147483647
  call void @use1(i1 %isneg)
  %r = select i1 %isneg, float -44.0, float 44.0
  ret float %r
}

; Negative test

define float @copysign_type_mismatch(double %x) {
; CHECK-LABEL: @copysign_type_mismatch(
; CHECK-NEXT:    [[I:%.*]] = bitcast double [[X:%.*]] to i64
; CHECK-NEXT:    [[ISPOS:%.*]] = icmp sgt i64 [[I]], -1
; CHECK-NEXT:    [[R:%.*]] = select i1 [[ISPOS]], float 1.000000e+00, float -1.000000e+00
; CHECK-NEXT:    ret float [[R]]
;
  %i = bitcast double %x to i64
  %ispos = icmp sgt i64 %i, -1
  %r = select i1 %ispos, float 1.0, float -1.0
  ret float %r
}

; Negative test

define float @copysign_wrong_cmp(float %x) {
; CHECK-LABEL: @copysign_wrong_cmp(
; CHECK-NEXT:    [[I:%.*]] = bitcast float [[X:%.*]] to i32
; CHECK-NEXT:    [[ISPOS:%.*]] = icmp sgt i32 [[I]], 0
; CHECK-NEXT:    [[R:%.*]] = select i1 [[ISPOS]], float 1.000000e+00, float -1.000000e+00
; CHECK-NEXT:    ret float [[R]]
;
  %i = bitcast float %x to i32
  %ispos = icmp sgt i32 %i, 0
  %r = select i1 %ispos, float 1.0, float -1.0
  ret float %r
}

; Negative test

define float @copysign_wrong_const(float %x) {
; CHECK-LABEL: @copysign_wrong_const(
; CHECK-NEXT:    [[I:%.*]] = bitcast float [[X:%.*]] to i32
; CHECK-NEXT:    [[ISPOS:%.*]] = icmp sgt i32 [[I]], -1
; CHECK-NEXT:    [[R:%.*]] = select i1 [[ISPOS]], float 2.000000e+00, float -1.000000e+00
; CHECK-NEXT:    ret float [[R]]
;
  %i = bitcast float %x to i32
  %ispos = icmp sgt i32 %i, -1
  %r = select i1 %ispos, float 2.0, float -1.0
  ret float %r
}

; TODO: we can replace select with a Phi.
define i32 @select_dominating_cond(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominating_cond(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[Y:%.*]], [[IF_FALSE]] ], [ [[X:%.*]], [[IF_TRUE]] ]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %s = select i1 %cond, i32 %x, i32 %y
  ret i32 %s
}

define i32 @select_dominating_inverted(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominating_inverted(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_FALSE:%.*]], label [[IF_TRUE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[X:%.*]], [[IF_FALSE]] ], [ [[Y:%.*]], [[IF_TRUE]] ]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  %inverted = xor i1 %cond, 1
  br i1 %inverted, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %s = select i1 %cond, i32 %x, i32 %y
  ret i32 %s
}

; More complex CFG: the block with select has multiple predecessors.
define i32 @select_dominating_cond_multiple_preds(i1 %cond, i1 %cond2, i1 %cond3, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominating_cond_multiple_preds(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br i1 [[COND2:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_TRUE_2:%.*]]
; CHECK:       if.true.1:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.true.2:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       if.false:
; CHECK-NEXT:    br i1 [[COND3:%.*]], label [[IF_FALSE_1:%.*]], label [[EXIT:%.*]]
; CHECK:       if.false.1:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[Y:%.*]], [[IF_FALSE_1]] ], [ [[X:%.*]], [[IF_TRUE_2]] ], [ [[X]], [[IF_TRUE_1]] ]
; CHECK-NEXT:    ret i32 [[S]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 0
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br i1 %cond2, label %if.true.1, label %if.true.2

if.true.1:
  br label %merge

if.true.2:
  br label %merge

if.false:
  br i1 %cond3, label %if.false.1, label %exit

if.false.1:
  br label %merge

merge:
  %s = select i1 %cond, i32 %x, i32 %y
  ret i32 %s

exit:
  ret i32 0
}

; More complex CFG for inverted case: the block with select has multiple predecessors.
define i32 @select_dominating_cond_inverted_multiple_preds(i1 %cond, i1 %cond2, i1 %cond3, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominating_cond_inverted_multiple_preds(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_FALSE:%.*]], label [[IF_TRUE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br i1 [[COND2:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_TRUE_2:%.*]]
; CHECK:       if.true.1:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.true.2:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       if.false:
; CHECK-NEXT:    br i1 [[COND3:%.*]], label [[IF_FALSE_1:%.*]], label [[EXIT:%.*]]
; CHECK:       if.false.1:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[X:%.*]], [[IF_FALSE_1]] ], [ [[Y:%.*]], [[IF_TRUE_2]] ], [ [[Y]], [[IF_TRUE_1]] ]
; CHECK-NEXT:    ret i32 [[S]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 0
;
entry:
  %inverted = xor i1 %cond, 1
  br i1 %inverted, label %if.true, label %if.false

if.true:
  br i1 %cond2, label %if.true.1, label %if.true.2

if.true.1:
  br label %merge

if.true.2:
  br label %merge

if.false:
  br i1 %cond3, label %if.false.1, label %exit

if.false.1:
  br label %merge

merge:
  %s = select i1 %cond, i32 %x, i32 %y
  ret i32 %s

exit:
  ret i32 0
}

; More complex CFG for inverted case: the block with select has multiple predecessors that can duplicate.
define i32 @select_dominating_cond_inverted_multiple_duplicating_preds(i1 %cond, i32 %cond2, i1 %cond3, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominating_cond_inverted_multiple_duplicating_preds(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_FALSE:%.*]], label [[IF_TRUE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    switch i32 [[COND2:%.*]], label [[SWITCH_CASE_1:%.*]] [
; CHECK-NEXT:    i32 1, label [[MERGE:%.*]]
; CHECK-NEXT:    i32 2, label [[MERGE]]
; CHECK-NEXT:    i32 3, label [[MERGE]]
; CHECK-NEXT:    ]
; CHECK:       switch.case.1:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       if.false:
; CHECK-NEXT:    br i1 [[COND3:%.*]], label [[IF_FALSE_1:%.*]], label [[EXIT:%.*]]
; CHECK:       if.false.1:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[X:%.*]], [[IF_FALSE_1]] ], [ [[Y:%.*]], [[SWITCH_CASE_1]] ], [ [[Y]], [[IF_TRUE]] ], [ [[Y]], [[IF_TRUE]] ], [ [[Y]], [[IF_TRUE]] ]
; CHECK-NEXT:    ret i32 [[S]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 0
;
entry:
  %inverted = xor i1 %cond, 1
  br i1 %inverted, label %if.true, label %if.false

if.true:
  switch i32 %cond2, label %switch.case.1 [
  i32 1, label %merge
  i32 2, label %merge
  i32 3, label %merge
  ]

switch.case.1:
  br label %merge

if.false:
  br i1 %cond3, label %if.false.1, label %exit

if.false.1:
  br label %merge

merge:
  %s = select i1 %cond, i32 %x, i32 %y
  ret i32 %s

exit:
  ret i32 0
}

; Negative test: currently we take condition from IDom, but might be willing to expand it in the future.
define i32 @select_not_imm_dominating_cond_neg(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @select_not_imm_dominating_cond_neg(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND]], i32 [[X:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  br label %exit

exit:
  %s = select i1 %cond, i32 %x, i32 %y
  ret i32 %s
}

; Shows how we can leverage dominance to eliminate duplicating selects.
define i32 @select_dominance_chain(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominance_chain(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_FALSE_1:%.*]]
; CHECK:       if.true.1:
; CHECK-NEXT:    br label [[MERGE_1:%.*]]
; CHECK:       if.false.1:
; CHECK-NEXT:    br label [[MERGE_1]]
; CHECK:       merge.1:
; CHECK-NEXT:    br i1 [[COND]], label [[IF_TRUE_2:%.*]], label [[IF_FALSE_2:%.*]]
; CHECK:       if.true.2:
; CHECK-NEXT:    br label [[MERGE_2:%.*]]
; CHECK:       if.false.2:
; CHECK-NEXT:    br label [[MERGE_2]]
; CHECK:       merge.2:
; CHECK-NEXT:    br i1 [[COND]], label [[IF_TRUE_3:%.*]], label [[IF_FALSE_3:%.*]]
; CHECK:       if.true.3:
; CHECK-NEXT:    br label [[MERGE_3:%.*]]
; CHECK:       if.false.3:
; CHECK-NEXT:    br label [[MERGE_3]]
; CHECK:       merge.3:
; CHECK-NEXT:    [[S_1:%.*]] = phi i32 [ [[Y:%.*]], [[IF_FALSE_3]] ], [ [[X:%.*]], [[IF_TRUE_3]] ]
; CHECK-NEXT:    [[SUM_2:%.*]] = mul i32 [[S_1]], 3
; CHECK-NEXT:    ret i32 [[SUM_2]]
;
entry:
  br i1 %cond, label %if.true.1, label %if.false.1

if.true.1:
  br label %merge.1

if.false.1:
  br label %merge.1

merge.1:
  %s.1 = select i1 %cond, i32 %x, i32 %y
  br i1 %cond, label %if.true.2, label %if.false.2

if.true.2:
  br label %merge.2

if.false.2:
  br label %merge.2

merge.2:
  %s.2 = select i1 %cond, i32 %x, i32 %y
  br i1 %cond, label %if.true.3, label %if.false.3

if.true.3:
  br label %merge.3

if.false.3:
  br label %merge.3

merge.3:
  %s.3 = select i1 %cond, i32 %x, i32 %y
  %sum.1 = add i32 %s.1, %s.2
  %sum.2 = add i32 %sum.1, %s.3
  ret i32 %sum.2
}

; TODO: We can replace select with a Phi and then sink a and b to respective
; branches.
define i32 @select_dominating_cond_and_sink(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @select_dominating_cond_and_sink(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[B:%.*]] = mul i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[A:%.*]] = add i32 [[X]], [[Y]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND]], i32 [[A]], i32 [[B]]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  %a = add i32 %x, %y
  %b = mul i32 %x, %y
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %s = select i1 %cond, i32 %a, i32 %b
  ret i32 %s
}

define i32 @select_dominating_cond_same_labels(i1 %cond) {
; CHECK-LABEL: @select_dominating_cond_same_labels(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 false, label [[EXIT:%.*]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[COND:%.*]], i32 123, i32 456
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %result = select i1 %cond, i32 123, i32 456
  br i1 %cond, label %exit, label %exit
exit:
  ret i32 %result
}

define i32 @select_phi_same_condition(i1 %cond, i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_phi_same_condition(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[Z:%.*]], [[IF_FALSE]] ], [ [[X:%.*]], [[IF_TRUE]] ]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [0, %if.true], [%z, %if.false]
  %s = select i1 %cond, i32 %x, i32 %phi
  ret i32 %s
}


; TODO: Replace with phi[a, c] and sink them to respective branches.
define i32 @select_phi_same_condition_sink(i1 %cond, i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_phi_same_condition_sink(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    [[B:%.*]] = mul i32 [[X:%.*]], [[Z:%.*]]
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 0, [[IF_TRUE]] ], [ [[B]], [[IF_FALSE]] ]
; CHECK-NEXT:    [[A:%.*]] = add i32 [[X]], [[Y:%.*]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND]], i32 [[A]], i32 [[PHI]]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  %a = add i32 %x, %y
  %b = mul i32 %x, %z
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [0, %if.true], [%b, %if.false]
  %s = select i1 %cond, i32 %a, i32 %phi
  ret i32 %s
}

declare i32 @__gxx_personality_v0(...)
declare i1 @foo()

define i32 @test_invoke_neg(i32 %x, i32 %y) nounwind uwtable ssp personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @test_invoke_neg(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[COND:%.*]] = invoke i1 @foo()
; CHECK-NEXT:    to label [[INVOKE_CONT:%.*]] unwind label [[LPAD:%.*]]
; CHECK:       invoke.cont:
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[COND]], i32 [[X:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[SEL]]
; CHECK:       lpad:
; CHECK-NEXT:    [[LP:%.*]] = landingpad { i1, i32 }
; CHECK-NEXT:    filter [0 x i1] zeroinitializer
; CHECK-NEXT:    unreachable
;
entry:
  %cond = invoke i1 @foo()
  to label %invoke.cont unwind label %lpad

invoke.cont:
  %sel = select i1 %cond, i32 %x, i32 %y
  ret i32 %sel

lpad:
  %lp = landingpad { i1, i32 }
  filter [0 x i1] zeroinitializer
  unreachable
}

declare i32 @bar()

define i32 @test_invoke_2_neg(i1 %cond, i32 %x, i32 %y) nounwind uwtable ssp personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @test_invoke_2_neg(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    [[RESULT:%.*]] = invoke i32 @bar()
; CHECK-NEXT:    to label [[MERGE]] unwind label [[LPAD:%.*]]
; CHECK:       merge:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 0, [[IF_TRUE]] ], [ [[RESULT]], [[IF_FALSE]] ]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[COND]], i32 1, i32 [[PHI]]
; CHECK-NEXT:    ret i32 [[SEL]]
; CHECK:       lpad:
; CHECK-NEXT:    [[LP:%.*]] = landingpad { i1, i32 }
; CHECK-NEXT:    filter [0 x i1] zeroinitializer
; CHECK-NEXT:    unreachable
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  %result = invoke i32 @bar()
  to label %merge unwind label %lpad

merge:
  %phi = phi i32 [ 0, %if.true ], [ %result, %if.false ]
  %sel = select i1 %cond, i32 1, i32 %phi
  ret i32 %sel

lpad:
  %lp = landingpad { i1, i32 }
  filter [0 x i1] zeroinitializer
  unreachable
}

define i32 @select_phi_same_condition_switch(i1 %cond, i32 %x, i32 %y) {
; CHECK-LABEL: @select_phi_same_condition_switch(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    switch i32 [[X:%.*]], label [[EXIT:%.*]] [
; CHECK-NEXT:    i32 1, label [[MERGE:%.*]]
; CHECK-NEXT:    i32 2, label [[MERGE]]
; CHECK-NEXT:    ]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 0
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ [[Y:%.*]], [[IF_FALSE]] ], [ [[X]], [[IF_TRUE]] ], [ [[X]], [[IF_TRUE]] ]
; CHECK-NEXT:    ret i32 [[S]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  switch i32 %x, label %exit [
  i32 1, label %merge
  i32 2, label %merge
  ]

exit:
  ret i32 0

if.false:
  br label %merge

merge:
  %phi = phi i32 [0, %if.true], [0, %if.true], [%y, %if.false]
  %s = select i1 %cond, i32 %x, i32 %phi
  ret i32 %s
}

define i32 @transit_different_values_through_phi(i1 %cond, i1 %cond2) {
; CHECK-LABEL: @transit_different_values_through_phi(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br i1 [[COND2:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_TRUE_2:%.*]]
; CHECK:       if.true.1:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.true.2:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[S:%.*]] = phi i32 [ 3, [[IF_FALSE]] ], [ 2, [[IF_TRUE_2]] ], [ 1, [[IF_TRUE_1]] ]
; CHECK-NEXT:    ret i32 [[S]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 0
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br i1 %cond2, label %if.true.1, label %if.true.2

if.true.1:
  br label %merge

if.true.2:
  br label %merge

if.false:
  br label %merge

merge:
  %p = phi i32 [ 1, %if.true.1 ], [ 2, %if.true.2 ], [ 4, %if.false ]
  %s = select i1 %cond, i32 %p, i32 3
  ret i32 %s

exit:
  ret i32 0
}

define i32 @select_phi_degenerate(i1 %cond, i1 %cond2) {
; CHECK-LABEL: @select_phi_degenerate(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[LOOP:%.*]], label [[EXIT:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SELECT:%.*]] = phi i32 [ [[IV_INC:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_INC]] = add i32 [[SELECT]], 1
; CHECK-NEXT:    br i1 [[COND2:%.*]], label [[LOOP]], label [[EXIT2:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 0
; CHECK:       exit2:
; CHECK-NEXT:    ret i32 [[IV_INC]]
;
entry:
  br i1 %cond, label %loop, label %exit

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
  %select = select i1 %cond, i32 %iv, i32 -1
  %iv.inc = add i32 %select, 1
  br i1 %cond2, label %loop, label %exit2

exit:
  ret i32 0

exit2:
  ret i32 %iv.inc
}

define i32 @test_select_into_phi_not_idom(i1 %cond, i32 %A, i32 %B)  {
; CHECK-LABEL: @test_select_into_phi_not_idom(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 [[A:%.*]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [%A, %if.true], [%B, %if.false]
  br label %exit

exit:
  %sel = select i1 %cond, i32 %phi, i32 %A
  ret i32 %sel
}

define i32 @test_select_into_phi_not_idom_2(i1 %cond, i32 %A, i32 %B)  {
; CHECK-LABEL: @test_select_into_phi_not_idom_2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 [[B:%.*]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [%A, %if.true], [%B, %if.false]
  br label %exit

exit:
  %sel = select i1 %cond, i32 %B, i32 %phi
  ret i32 %sel
}

define i32 @test_select_into_phi_not_idom_inverted(i1 %cond, i32 %A, i32 %B)  {
; CHECK-LABEL: @test_select_into_phi_not_idom_inverted(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_FALSE:%.*]], label [[IF_TRUE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[SEL:%.*]] = phi i32 [ [[B:%.*]], [[IF_FALSE]] ], [ [[A:%.*]], [[IF_TRUE]] ]
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 [[SEL]]
;
entry:
  %inverted = xor i1 %cond, 1
  br i1 %inverted, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [%A, %if.true], [%B, %if.false]
  br label %exit

exit:
  %sel = select i1 %cond, i32 %phi, i32 %A
  ret i32 %sel
}

define i32 @test_select_into_phi_not_idom_inverted_2(i1 %cond, i32 %A, i32 %B)  {
; CHECK-LABEL: @test_select_into_phi_not_idom_inverted_2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_FALSE:%.*]], label [[IF_TRUE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[SEL:%.*]] = phi i32 [ [[B:%.*]], [[IF_FALSE]] ], [ [[A:%.*]], [[IF_TRUE]] ]
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 [[SEL]]
;
entry:
  %inverted = xor i1 %cond, 1
  br i1 %inverted, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [%A, %if.true], [%B, %if.false]
  br label %exit

exit:
  %sel = select i1 %cond, i32 %B, i32 %phi
  ret i32 %sel
}

define i32 @test_select_into_phi_not_idom_no_dom_input_1(i1 %cond, i32 %A, i32 %B, i32 *%p)  {
; CHECK-LABEL: @test_select_into_phi_not_idom_no_dom_input_1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    [[C:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[SEL:%.*]] = phi i32 [ [[A:%.*]], [[IF_FALSE]] ], [ [[C]], [[IF_TRUE]] ]
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 [[SEL]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  %C = load i32, i32* %p
  br label %merge

if.false:
  br label %merge

merge:
  %phi = phi i32 [%C, %if.true], [%B, %if.false]
  br label %exit

exit:
  %sel = select i1 %cond, i32 %phi, i32 %A
  ret i32 %sel
}

define i32 @test_select_into_phi_not_idom_no_dom_input_2(i1 %cond, i32 %A, i32 %B, i32 *%p)  {
; CHECK-LABEL: @test_select_into_phi_not_idom_no_dom_input_2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.true:
; CHECK-NEXT:    br label [[MERGE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    [[C:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT:    br label [[MERGE]]
; CHECK:       merge:
; CHECK-NEXT:    [[SEL:%.*]] = phi i32 [ [[C]], [[IF_FALSE]] ], [ [[B:%.*]], [[IF_TRUE]] ]
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 [[SEL]]
;
entry:
  br i1 %cond, label %if.true, label %if.false

if.true:
  br label %merge

if.false:
  %C = load i32, i32* %p
  br label %merge

merge:
  %phi = phi i32 [%A, %if.true], [%C, %if.false]
  br label %exit

exit:
  %sel = select i1 %cond, i32 %B, i32 %phi
  ret i32 %sel
}

; Negative tests to ensure we don't remove selects with undef true/false values.
; See https://bugs.llvm.org/show_bug.cgi?id=31633
; https://lists.llvm.org/pipermail/llvm-dev/2016-October/106182.html
; https://reviews.llvm.org/D83360
define i32 @false_undef(i1 %cond, i32 %x) {
; CHECK-LABEL: @false_undef(
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND:%.*]], i32 [[X:%.*]], i32 undef
; CHECK-NEXT:    ret i32 [[S]]
;
  %s = select i1 %cond, i32 %x, i32 undef
  ret i32 %s
}

define i32 @true_undef(i1 %cond, i32 %x) {
; CHECK-LABEL: @true_undef(
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND:%.*]], i32 undef, i32 [[X:%.*]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %s = select i1 %cond, i32 undef, i32 %x
  ret i32 %s
}

define <2 x i32> @false_undef_vec(i1 %cond, <2 x i32> %x) {
; CHECK-LABEL: @false_undef_vec(
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND:%.*]], <2 x i32> [[X:%.*]], <2 x i32> undef
; CHECK-NEXT:    ret <2 x i32> [[S]]
;
  %s = select i1 %cond, <2 x i32> %x, <2 x i32> undef
  ret <2 x i32> %s
}

define <2 x i32> @true_undef_vec(i1 %cond, <2 x i32> %x) {
; CHECK-LABEL: @true_undef_vec(
; CHECK-NEXT:    [[S:%.*]] = select i1 [[COND:%.*]], <2 x i32> undef, <2 x i32> [[X:%.*]]
; CHECK-NEXT:    ret <2 x i32> [[S]]
;
  %s = select i1 %cond, <2 x i32> undef, <2 x i32> %x
  ret <2 x i32> %s
}

define i8 @cond_freeze(i8 %x, i8 %y) {
; CHECK-LABEL: @cond_freeze(
; CHECK-NEXT:    ret i8 [[X:%.*]]
;
  %cond.fr = freeze i1 undef
  %s = select i1 %cond.fr, i8 %x, i8 %y
  ret i8 %s
}

define i8 @cond_freeze2(i8 %x, i8 %y) {
; CHECK-LABEL: @cond_freeze2(
; CHECK-NEXT:    ret i8 1
;
  %cond.fr = freeze i1 undef
  %s = select i1 %cond.fr, i8 %x, i8 1
  ret i8 %s
}

define i8 @cond_freeze3(i8 %x) {
; CHECK-LABEL: @cond_freeze3(
; CHECK-NEXT:    ret i8 1
;
  %cond.fr = freeze i1 undef
  %s = select i1 %cond.fr, i8 1, i8 %x
  ret i8 %s
}

define <2 x i8> @cond_freeze_vec(<2 x i8> %x) {
; CHECK-LABEL: @cond_freeze_vec(
; CHECK-NEXT:    ret <2 x i8> <i8 1, i8 2>
;
  %cond.fr = freeze <2 x i1> <i1 undef, i1 undef>
  %s = select <2 x i1> %cond.fr, <2 x i8> <i8 1, i8 2>, <2 x i8> %x
  ret <2 x i8> %s
}

declare void @foo2(i8, i8)

define void @cond_freeze_multipleuses(i8 %x, i8 %y) {
; CHECK-LABEL: @cond_freeze_multipleuses(
; CHECK-NEXT:    call void @foo2(i8 [[X:%.*]], i8 [[Y:%.*]])
; CHECK-NEXT:    ret void
;
  %cond.fr = freeze i1 undef
  %s = select i1 %cond.fr, i8 %x, i8 %y
  %s2 = select i1 %cond.fr, i8 %y, i8 %x
  call void @foo2(i8 %s, i8 %s2)
  ret void
}

define i32 @select_freeze_icmp_eq(i32 %x, i32 %y) {
; CHECK-LABEL: @select_freeze_icmp_eq(
; CHECK-NEXT:    ret i32 [[Y:%.*]]
;
  %c = icmp eq i32 %x, %y
  %c.fr = freeze i1 %c
  %v = select i1 %c.fr, i32 %x, i32 %y
  ret i32 %v
}

define i32 @select_freeze_icmp_ne(i32 %x, i32 %y) {
; CHECK-LABEL: @select_freeze_icmp_ne(
; CHECK-NEXT:    ret i32 [[X:%.*]]
;
  %c = icmp ne i32 %x, %y
  %c.fr = freeze i1 %c
  %v = select i1 %c.fr, i32 %x, i32 %y
  ret i32 %v
}

define i32 @select_freeze_icmp_else(i32 %x, i32 %y) {
; CHECK-LABEL: @select_freeze_icmp_else(
; CHECK-NEXT:    [[C:%.*]] = icmp ult i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[C_FR:%.*]] = freeze i1 [[C]]
; CHECK-NEXT:    [[V:%.*]] = select i1 [[C_FR]], i32 [[X]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[V]]
;
  %c = icmp ult i32 %x, %y
  %c.fr = freeze i1 %c
  %v = select i1 %c.fr, i32 %x, i32 %y
  ret i32 %v
}

declare void @use_i1_i32(i1, i32)

define void @select_freeze_icmp_multuses(i32 %x, i32 %y) {
; CHECK-LABEL: @select_freeze_icmp_multuses(
; CHECK-NEXT:    [[C:%.*]] = icmp ne i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[C_FR:%.*]] = freeze i1 [[C]]
; CHECK-NEXT:    [[V:%.*]] = select i1 [[C_FR]], i32 [[X]], i32 [[Y]]
; CHECK-NEXT:    call void @use_i1_i32(i1 [[C_FR]], i32 [[V]])
; CHECK-NEXT:    ret void
;
  %c = icmp ne i32 %x, %y
  %c.fr = freeze i1 %c
  %v = select i1 %c.fr, i32 %x, i32 %y
  call void @use_i1_i32(i1 %c.fr, i32 %v)
  ret void
}

define i32 @pr47322_more_poisonous_replacement(i32 %arg) {
; CHECK-LABEL: @pr47322_more_poisonous_replacement(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[ARG:%.*]], 0
; CHECK-NEXT:    [[TRAILING:%.*]] = call i32 @llvm.cttz.i32(i32 [[ARG]], i1 immarg true), [[RNG0:!range !.*]]
; CHECK-NEXT:    [[SHIFTED:%.*]] = lshr i32 [[ARG]], [[TRAILING]]
; CHECK-NEXT:    [[R1_SROA_0_1:%.*]] = select i1 [[CMP]], i32 0, i32 [[SHIFTED]]
; CHECK-NEXT:    ret i32 [[R1_SROA_0_1]]
;
  %cmp = icmp eq i32 %arg, 0
  %trailing = call i32 @llvm.cttz.i32(i32 %arg, i1 immarg true)
  %shifted = lshr i32 %arg, %trailing
  %r1.sroa.0.1 = select i1 %cmp, i32 0, i32 %shifted
  ret i32 %r1.sroa.0.1
}

define i8 @select_replacement_add_eq(i8 %x, i8 %y) {
; CHECK-LABEL: @select_replacement_add_eq(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 2, i8 [[Y:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %cmp = icmp eq i8 %x, 1
  %add = add i8 %x, 1
  %sel = select i1 %cmp, i8 %add, i8 %y
  ret i8 %sel
}

define i8 @select_replacement_add_ne(i8 %x, i8 %y) {
; CHECK-LABEL: @select_replacement_add_ne(
; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i8 [[X:%.*]], 1
; CHECK-NEXT:    call void @use(i1 [[CMP]])
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[Y:%.*]], i8 2
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %cmp = icmp ne i8 %x, 1
  call void @use(i1 %cmp)
  %add = add i8 %x, 1
  %sel = select i1 %cmp, i8 %y, i8 %add
  ret i8 %sel
}

define i8 @select_replacement_add_nuw(i8 %x, i8 %y) {
; CHECK-LABEL: @select_replacement_add_nuw(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 2, i8 [[Y:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %cmp = icmp eq i8 %x, 1
  %add = add nuw i8 %x, 1
  %sel = select i1 %cmp, i8 %add, i8 %y
  ret i8 %sel
}

define i8 @select_replacement_sub_noundef(i8 %x, i8 noundef %y, i8 %z) {
; CHECK-LABEL: @select_replacement_sub_noundef(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 0, i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %cmp = icmp eq i8 %x, %y
  %sub = sub i8 %x, %y
  %sel = select i1 %cmp, i8 %sub, i8 %z
  ret i8 %sel
}

; TODO: The transform is also safe without noundef.
define i8 @select_replacement_sub(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @select_replacement_sub(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[SUB:%.*]] = sub i8 [[X]], [[Y]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[SUB]], i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %cmp = icmp eq i8 %x, %y
  %sub = sub i8 %x, %y
  %sel = select i1 %cmp, i8 %sub, i8 %z
  ret i8 %sel
}

define i8 @select_replacement_shift_noundef(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @select_replacement_shift_noundef(
; CHECK-NEXT:    [[SHR:%.*]] = lshr exact i8 [[X:%.*]], 1
; CHECK-NEXT:    call void @use_i8(i8 noundef [[SHR]])
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[SHR]], [[Y:%.*]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[X]], i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %shr = lshr exact i8 %x, 1
  call void @use_i8(i8 noundef %shr)
  %cmp = icmp eq i8 %shr, %y
  %shl = shl i8 %y, 1
  %sel = select i1 %cmp, i8 %shl, i8 %z
  ret i8 %sel
}

; TODO: The transform is also safe without noundef.
define i8 @select_replacement_shift(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @select_replacement_shift(
; CHECK-NEXT:    [[SHR:%.*]] = lshr exact i8 [[X:%.*]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[SHR]], [[Y:%.*]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i8 [[Y]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[SHL]], i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %shr = lshr exact i8 %x, 1
  %cmp = icmp eq i8 %shr, %y
  %shl = shl i8 %y, 1
  %sel = select i1 %cmp, i8 %shl, i8 %z
  ret i8 %sel
}

define i8 @select_replacement_loop(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @select_replacement_loop(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[X]], i8 [[Z:%.*]]
; CHECK-NEXT:    ret i8 [[SEL]]
;
  %cmp = icmp eq i8 %x, %y
  %sel = select i1 %cmp, i8 %x, i8 %z
  ret i8 %sel
}

define i32 @select_replacement_loop2(i32 %arg, i32 %arg2) {
; CHECK-LABEL: @select_replacement_loop2(
; CHECK-NEXT:    [[DIV:%.*]] = udiv i32 [[ARG:%.*]], [[ARG2:%.*]]
; CHECK-NEXT:    [[MUL:%.*]] = mul nsw i32 [[DIV]], [[ARG2]]
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[MUL]], [[ARG]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i32 [[DIV]], i32 undef
; CHECK-NEXT:    ret i32 [[SEL]]
;
  %div = udiv i32 %arg, %arg2
  %mul = mul nsw i32 %div, %arg2
  %cmp = icmp eq i32 %mul, %arg
  %sel = select i1 %cmp, i32 %div, i32 undef
  ret i32 %sel
}

; TODO: Dropping the inbounds flag should not be necessary for this fold.
define i8* @select_replacement_gep_inbounds(i8* %base, i64 %offset) {
; CHECK-LABEL: @select_replacement_gep_inbounds(
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, i8* [[BASE:%.*]], i64 [[OFFSET:%.*]]
; CHECK-NEXT:    ret i8* [[GEP]]
;
  %cmp = icmp eq i64 %offset, 0
  %gep = getelementptr inbounds i8, i8* %base, i64 %offset
  %sel = select i1 %cmp, i8* %base, i8* %gep
  ret i8* %sel
}

declare void @use(i1)
declare void @use_i8(i8)
declare i32 @llvm.cttz.i32(i32, i1 immarg)