164 lines
6.1 KiB
LLVM
164 lines
6.1 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -instcombine-infinite-loop-threshold=2 -S | FileCheck %s
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; These xor-of-icmps could be replaced with and-of-icmps, but %cond0 has extra
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; uses, so we don't consider it, even though some cases are freely invertible.
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; %cond0 is extra-used in select, which is freely invertible.
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define i1 @v0_select_of_consts(i32 %X, i32* %selected) {
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; CHECK-LABEL: @v0_select_of_consts(
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; CHECK-NEXT: [[COND0_INV:%.*]] = icmp sgt i32 [[X:%.*]], 32767
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; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND0_INV]], i32 32767, i32 -32768
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; CHECK-NEXT: store i32 [[SELECT]], i32* [[SELECTED:%.*]], align 4
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X]], 32767
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[X_OFF]], 65535
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 32767, i32 -32768
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store i32 %select, i32* %selected
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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define i1 @v1_select_of_var_and_const(i32 %X, i32 %Y, i32* %selected) {
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; CHECK-LABEL: @v1_select_of_var_and_const(
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; CHECK-NEXT: [[COND0:%.*]] = icmp slt i32 [[X:%.*]], 32768
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; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND0]], i32 -32768, i32 [[Y:%.*]]
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; CHECK-NEXT: store i32 [[SELECT]], i32* [[SELECTED:%.*]], align 4
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X]], 32767
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[X_OFF]], 65535
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 %Y, i32 -32768
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store i32 %select, i32* %selected
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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define i1 @v2_select_of_const_and_var(i32 %X, i32 %Y, i32* %selected) {
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; CHECK-LABEL: @v2_select_of_const_and_var(
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; CHECK-NEXT: [[COND0_INV:%.*]] = icmp sgt i32 [[X:%.*]], 32767
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; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND0_INV]], i32 32767, i32 [[Y:%.*]]
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; CHECK-NEXT: store i32 [[SELECT]], i32* [[SELECTED:%.*]], align 4
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X]], 32767
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[X_OFF]], 65535
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 32767, i32 %Y
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store i32 %select, i32* %selected
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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; Branch is also freely invertible
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define i1 @v3_branch(i32 %X, i32* %dst0, i32* %dst1) {
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; CHECK-LABEL: @v3_branch(
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; CHECK-NEXT: begin:
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; CHECK-NEXT: [[COND0:%.*]] = icmp slt i32 [[X:%.*]], 32768
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; CHECK-NEXT: br i1 [[COND0]], label [[BB1:%.*]], label [[BB0:%.*]]
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; CHECK: bb0:
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; CHECK-NEXT: store i32 0, i32* [[DST0:%.*]], align 4
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; CHECK-NEXT: br label [[END:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: store i32 0, i32* [[DST1:%.*]], align 4
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X]], 32767
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ult i32 [[X_OFF]], 65535
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; CHECK-NEXT: ret i1 [[TMP0]]
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;
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begin:
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%cond0 = icmp sgt i32 %X, 32767
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%cond1 = icmp sgt i32 %X, -32768
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br i1 %cond0, label %bb0, label %bb1
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bb0:
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store i32 0, i32* %dst0
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br label %end
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bb1:
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store i32 0, i32* %dst1
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br label %end
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end:
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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; Can invert 'not'.
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define i1 @v4_not_store(i32 %X, i1* %not_cond) {
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; CHECK-LABEL: @v4_not_store(
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; CHECK-NEXT: [[COND0:%.*]] = icmp slt i32 [[X:%.*]], 32768
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; CHECK-NEXT: store i1 [[COND0]], i1* [[NOT_COND:%.*]], align 1
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X]], 32767
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[X_OFF]], 65535
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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%not_cond0 = xor i1 %cond0, -1
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store i1 %not_cond0, i1* %not_cond
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 32767, i32 -32768
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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; All extra uses are invertible.
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define i1 @v5_select_and_not(i32 %X, i32 %Y, i32* %selected, i1* %not_cond) {
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; CHECK-LABEL: @v5_select_and_not(
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; CHECK-NEXT: [[COND0:%.*]] = icmp slt i32 [[X:%.*]], 32768
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; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND0]], i32 [[Y:%.*]], i32 32767
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; CHECK-NEXT: store i1 [[COND0]], i1* [[NOT_COND:%.*]], align 1
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; CHECK-NEXT: store i32 [[SELECT]], i32* [[SELECTED:%.*]], align 4
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X]], 32767
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[X_OFF]], 65535
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 32767, i32 %Y
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%not_cond0 = xor i1 %cond0, -1
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store i1 %not_cond0, i1* %not_cond
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store i32 %select, i32* %selected
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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; Not all extra uses are invertible.
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define i1 @n6_select_and_not(i32 %X, i32 %Y, i32* %selected, i1* %not_cond) {
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; CHECK-LABEL: @n6_select_and_not(
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; CHECK-NEXT: [[COND0:%.*]] = icmp sgt i32 [[X:%.*]], 32767
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; CHECK-NEXT: [[COND1:%.*]] = icmp sgt i32 [[X]], -32768
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; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND0]], i32 32767, i32 [[Y:%.*]]
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; CHECK-NEXT: store i1 [[COND0]], i1* [[NOT_COND:%.*]], align 1
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; CHECK-NEXT: store i32 [[SELECT]], i32* [[SELECTED:%.*]], align 4
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; CHECK-NEXT: [[RES:%.*]] = xor i1 [[COND0]], [[COND1]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 32767, i32 %Y
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store i1 %cond0, i1* %not_cond
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store i32 %select, i32* %selected
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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; Not freely invertible, would require extra 'not' instruction.
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define i1 @n7_store(i32 %X, i1* %cond) {
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; CHECK-LABEL: @n7_store(
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; CHECK-NEXT: [[COND0:%.*]] = icmp sgt i32 [[X:%.*]], 32767
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; CHECK-NEXT: store i1 [[COND0]], i1* [[COND:%.*]], align 1
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; CHECK-NEXT: [[COND1:%.*]] = icmp sgt i32 [[X]], -32768
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; CHECK-NEXT: [[RES:%.*]] = xor i1 [[COND0]], [[COND1]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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%cond0 = icmp sgt i32 %X, 32767
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store i1 %cond0, i1* %cond
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%cond1 = icmp sgt i32 %X, -32768
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%select = select i1 %cond0, i32 32767, i32 -32768
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%res = xor i1 %cond0, %cond1
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ret i1 %res
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}
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