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Fix regression from r151466: an we can't replace uses of an instruction reachable from the entry block with uses of an instruction not reachable from the entry block. PR12231.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152595 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -94,9 +94,13 @@ static bool ValueDominatesPHI(Value *V, PHINode *P, const DominatorTree *DT) {
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return true;
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// If we have a DominatorTree then do a precise test.
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if (DT)
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return !DT->isReachableFromEntry(P->getParent()) ||
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!DT->isReachableFromEntry(I->getParent()) || DT->dominates(I, P);
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if (DT) {
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if (!DT->isReachableFromEntry(P->getParent()))
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return true;
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if (!DT->isReachableFromEntry(I->getParent()))
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return false;
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return DT->dominates(I, P);
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}
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// Otherwise, if the instruction is in the entry block, and is not an invoke,
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// then it obviously dominates all phi nodes.
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19
test/Transforms/EarlyCSE/instsimplify-dom.ll
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19
test/Transforms/EarlyCSE/instsimplify-dom.ll
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@ -0,0 +1,19 @@
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; RUN: opt -early-cse -S < %s | FileCheck %s
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; PR12231
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declare i32 @f()
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define i32 @fn() {
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entry:
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br label %lbl_1215
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lbl_1215:
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%ins34 = phi i32 [ %ins35, %xxx ], [ undef, %entry ]
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ret i32 %ins34
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xxx:
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%ins35 = call i32 @f()
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br label %lbl_1215
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}
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; CHECK: define i32 @fn
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