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| author | Andrew Trick <atrick@apple.com> | 2011-09-10 01:09:50 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-09-10 01:09:50 +0000 |
| commit | 543376743c900806109c75d4fd12c4ba01020cfe (patch) | |
| tree | 6ae92f15cb24eec26e1eda8554333060e5c187fd /lib/Analysis/ScalarEvolution.cpp | |
| parent | 2e3734e2d948af7c61c1957742811cdfca0e2516 (diff) | |
| download | external_llvm-543376743c900806109c75d4fd12c4ba01020cfe.zip external_llvm-543376743c900806109c75d4fd12c4ba01020cfe.tar.gz external_llvm-543376743c900806109c75d4fd12c4ba01020cfe.tar.bz2 | |
Set NSW/NUW flags on SCEVAddExpr when the operation is flagged as
such.
I'm doing this now for completeness because I can't think of/remember
any reason that it was left out. I'm not sure it will help anything,
but if we don't do it we need to explain why in comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139450 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 57c4265..b1662a0 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -3546,7 +3546,13 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) { AddOps.push_back(Op1); } AddOps.push_back(getSCEV(U->getOperand(0))); - return getAddExpr(AddOps); + SCEV::NoWrapFlags Flags = SCEV::FlagAnyWrap; + OverflowingBinaryOperator *OBO = cast<OverflowingBinaryOperator>(V); + if (OBO->hasNoSignedWrap()) + setFlags(Flags, SCEV::FlagNSW); + if (OBO->hasNoUnsignedWrap()) + setFlags(Flags, SCEV::FlagNUW); + return getAddExpr(AddOps, Flags); } case Instruction::Mul: { // See the Add code above. |