dd116369f6
We can only replace phi(X, undef) with X, if X is known not to be poison. Otherwise, the result may be more poisonous on the undef branch. Fixes https://github.com/llvm/llvm-project/issues/68683.
24 lines
695 B
LLVM
24 lines
695 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt < %s -passes=mem2reg -S | FileCheck %s
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define i32 @testfunc(i1 %C, i32 %i, i8 %j) {
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; CHECK-LABEL: define i32 @testfunc(
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; CHECK-SAME: i1 [[C:%.*]], i32 [[I:%.*]], i8 [[J:%.*]]) {
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; CHECK-NEXT: br i1 [[C]], label %[[T:.*]], label %[[CONT:.*]]
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; CHECK: [[T]]:
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; CHECK-NEXT: br label %[[CONT]]
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; CHECK: [[CONT]]:
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; CHECK-NEXT: [[I_0:%.*]] = phi i32 [ [[I]], %[[T]] ], [ undef, [[TMP0:%.*]] ]
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; CHECK-NEXT: ret i32 [[I_0]]
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;
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%I = alloca i32
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br i1 %C, label %T, label %Cont
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T:
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store i32 %i, ptr %I
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br label %Cont
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Cont:
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%Y = load i32, ptr %I
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ret i32 %Y
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}
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