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[CVP] prevent propagating poison when substituting edge values into a phi (PR43802)

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This phi simplification transform was added with:
D45448

However as shown in PR43802:
https://bugs.llvm.org/show_bug.cgi?id=43802

...we must be careful not to propagate poison when we do the substitution.
There might be some more complicated analysis possible to retain the overflow flag,
but it should always be safe and easy to drop flags (we have similar behavior in
instcombine and other passes).

Differential Revision: https://reviews.llvm.org/D69442
This commit is contained in:
Sanjay Patel 2019-10-28 08:56:23 -04:00
parent ee50590e16
commit f2e93d10fe
2 changed files with 9 additions and 3 deletions
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9
llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
View File

@ -194,7 +194,14 @@ static bool simplifyCommonValuePhi(PHINode *P, LazyValueInfo *LVI,
}
// All constant incoming values map to the same variable along the incoming
// edges of the phi. The phi is unnecessary.
// edges of the phi. The phi is unnecessary. However, we must drop all
// poison-generating flags to ensure that no poison is propagated to the phi
// location by performing this substitution.
// Warning: If the underlying analysis changes, this may not be enough to
// guarantee that poison is not propagated.
// TODO: We may be able to re-infer flags by re-analyzing the instruction.
if (auto *CommonInst = dyn_cast<Instruction>(CommonValue))
CommonInst->dropPoisonGeneratingFlags();
P->replaceAllUsesWith(CommonValue);
P->eraseFromParent();
++NumPhiCommon;

3
llvm/test/Transforms/CorrelatedValuePropagation/phi-common-val.ll
View File

@ -123,14 +123,13 @@ return:
ret i8* %r
}
; FIXME:
; The sub has 'nsw', so it is not safe to propagate that value along
; the bb2 edge because that would propagate poison to the return.
define i32 @PR43802(i32 %arg) {
; CHECK-LABEL: @PR43802(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 0, [[ARG:%.*]]
; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[ARG:%.*]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[ARG]], -2147483648
; CHECK-NEXT: br i1 [[CMP]], label [[BB2:%.*]], label [[BB3:%.*]]
; CHECK: bb2: