d01aec4c76
Set phi inputs to poison whenever we find a dead edge (either during initial worklist population or the main InstCombine run), instead of only doing this for successors of dead blocks. This means that the phi operand is set to poison even if for critical edges without an intermediate block. There are quite a few test changes, because the pattern is fairly common in vectorizer output, for cases where we know the vectorized loop will be entered.
31 lines
952 B
LLVM
31 lines
952 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instcombine -S %s | FileCheck %s
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@A = extern_weak global i32, align 4
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@B = extern_weak global i32, align 4
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define i32 @foo(i1 %which, ptr %dst) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 true, label [[FINAL:%.*]], label [[DELAY:%.*]]
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; CHECK: delay:
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; CHECK-NEXT: br label [[FINAL]]
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; CHECK: final:
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; CHECK-NEXT: store i1 false, ptr [[DST:%.*]], align 1
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; CHECK-NEXT: ret i32 1
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;
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entry:
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br i1 true, label %final, label %delay
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delay: ; preds = %entry
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br label %final
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final: ; preds = %delay, %entry
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%use2 = phi i1 [ false, %entry ], [ icmp eq (ptr @A, ptr @B), %delay ]
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%value = select i1 %use2, i32 2, i32 1
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%B7 = mul i32 %value, 2147483647
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%C3 = icmp ule i32 %B7, 0
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store i1 %C3, ptr %dst
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ret i32 %value
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}
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