201 lines
4.5 KiB
LLVM
201 lines
4.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -keep-loops=0 < %s | FileCheck %s
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; Merge 2 undefined incoming values.
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define i32 @undef_merge(i32 %x) {
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; CHECK-LABEL: @undef_merge(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i32 4, label [[G:%.*]]
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; CHECK-NEXT: i32 12, label [[G]]
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; CHECK-NEXT: ]
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; CHECK: g:
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; CHECK-NEXT: [[K3:%.*]] = phi i64 [ undef, [[ENTRY:%.*]] ], [ [[K3]], [[G]] ], [ undef, [[ENTRY]] ]
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; CHECK-NEXT: br label [[G]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 undef
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;
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entry:
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switch i32 %x, label %exit [
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i32 4, label %loop
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i32 12, label %g
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]
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loop:
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%k2 = phi i64 [ %k3, %g ], [ undef, %entry ]
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br label %g
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g:
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%k3 = phi i64 [ %k2, %loop ], [ undef, %entry ]
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br label %loop
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exit:
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ret i32 undef
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}
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; Merge 2 poison incoming values.
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define i32 @poison_merge(i32 %x) {
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; CHECK-LABEL: @poison_merge(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i32 4, label [[G:%.*]]
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; CHECK-NEXT: i32 12, label [[G]]
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; CHECK-NEXT: ]
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; CHECK: g:
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; CHECK-NEXT: [[K3:%.*]] = phi i64 [ poison, [[ENTRY:%.*]] ], [ [[K3]], [[G]] ], [ poison, [[ENTRY]] ]
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; CHECK-NEXT: br label [[G]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 undef
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;
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entry:
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switch i32 %x, label %exit [
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i32 4, label %loop
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i32 12, label %g
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]
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loop:
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%k2 = phi i64 [ %k3, %g ], [ poison, %entry ]
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br label %g
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g:
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%k3 = phi i64 [ %k2, %loop ], [ poison, %entry ]
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br label %loop
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exit:
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ret i32 undef
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}
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; Merge equal defined incoming values.
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define i32 @defined_merge(i32 %x) {
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; CHECK-LABEL: @defined_merge(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i32 4, label [[G:%.*]]
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; CHECK-NEXT: i32 12, label [[G]]
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; CHECK-NEXT: ]
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; CHECK: g:
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; CHECK-NEXT: [[K3:%.*]] = phi i64 [ 42, [[ENTRY:%.*]] ], [ [[K3]], [[G]] ], [ 42, [[ENTRY]] ]
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; CHECK-NEXT: br label [[G]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 undef
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;
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entry:
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switch i32 %x, label %exit [
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i32 4, label %loop
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i32 12, label %g
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]
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loop:
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%k2 = phi i64 [ %k3, %g ], [ 42, %entry ]
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br label %g
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g:
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%k3 = phi i64 [ %k2, %loop ], [ 42, %entry ]
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br label %loop
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exit:
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ret i32 undef
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}
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; Merge defined and undef incoming values.
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define i32 @defined_and_undef_merge(i32 %x) {
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; CHECK-LABEL: @defined_and_undef_merge(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i32 4, label [[G:%.*]]
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; CHECK-NEXT: i32 12, label [[G]]
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; CHECK-NEXT: ]
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; CHECK: g:
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; CHECK-NEXT: [[K3:%.*]] = phi i64 [ 42, [[ENTRY:%.*]] ], [ [[K3]], [[G]] ], [ 42, [[ENTRY]] ]
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; CHECK-NEXT: br label [[G]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 undef
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;
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entry:
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switch i32 %x, label %exit [
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i32 4, label %loop
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i32 12, label %g
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]
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loop:
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%k2 = phi i64 [ %k3, %g ], [ undef, %entry ]
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br label %g
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g:
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%k3 = phi i64 [ %k2, %loop ], [ 42, %entry ]
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br label %loop
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exit:
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ret i32 undef
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}
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; Merge defined and poison incoming values.
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define i32 @defined_and_poison_merge(i32 %x) {
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; CHECK-LABEL: @defined_and_poison_merge(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i32 4, label [[G:%.*]]
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; CHECK-NEXT: i32 12, label [[G]]
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; CHECK-NEXT: ]
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; CHECK: g:
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; CHECK-NEXT: [[K3:%.*]] = phi i64 [ 42, [[ENTRY:%.*]] ], [ [[K3]], [[G]] ], [ 42, [[ENTRY]] ]
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; CHECK-NEXT: br label [[G]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 undef
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;
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entry:
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switch i32 %x, label %exit [
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i32 4, label %loop
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i32 12, label %g
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]
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loop:
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%k2 = phi i64 [ %k3, %g ], [ poison, %entry ]
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br label %g
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g:
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%k3 = phi i64 [ %k2, %loop ], [ 42, %entry ]
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br label %loop
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exit:
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ret i32 undef
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}
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; Do not crash trying to merge poison and undef into a single phi.
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define i32 @PR49218(i32 %x) {
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; CHECK-LABEL: @PR49218(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i32 4, label [[G:%.*]]
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; CHECK-NEXT: i32 12, label [[G]]
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; CHECK-NEXT: ]
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; CHECK: g:
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; CHECK-NEXT: [[K3:%.*]] = phi i64 [ undef, [[ENTRY:%.*]] ], [ [[K3]], [[G]] ], [ undef, [[ENTRY]] ]
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; CHECK-NEXT: br label [[G]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 undef
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;
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entry:
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switch i32 %x, label %exit [
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i32 4, label %loop
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i32 12, label %g
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]
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loop:
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%k2 = phi i64 [ %k3, %g ], [ undef, %entry ]
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br label %g
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g:
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%k3 = phi i64 [ %k2, %loop ], [ poison, %entry ]
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br label %loop
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exit:
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ret i32 undef
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}
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