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Make sure we don't return bits outside the mask in ComputeMaskedBits. PR12189.
llvm-svn: 152066
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@ -691,8 +691,8 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
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if (P->hasConstantValue() == P)
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if (P->hasConstantValue() == P)
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break;
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break;
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KnownZero = APInt::getAllOnesValue(BitWidth);
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KnownZero = Mask;
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KnownOne = APInt::getAllOnesValue(BitWidth);
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KnownOne = Mask;
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for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) {
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for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) {
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// Skip direct self references.
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// Skip direct self references.
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if (P->getIncomingValue(i) == P) continue;
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if (P->getIncomingValue(i) == P) continue;
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22
test/Transforms/InstSimplify/phi.ll
Normal file
22
test/Transforms/InstSimplify/phi.ll
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@ -0,0 +1,22 @@
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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; PR12189
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define i1 @test1(i32 %x) {
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; CHECK: @test1
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br i1 true, label %a, label %b
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a:
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%aa = or i32 %x, 10
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br label %c
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b:
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%bb = or i32 %x, 10
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br label %c
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c:
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%cc = phi i32 [ %bb, %b ], [%aa, %a ]
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%d = urem i32 %cc, 2
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%e = icmp eq i32 %d, 0
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ret i1 %e
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; CHECK: ret i1 %e
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}
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