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| author | Brian Gesiak <modocache@gmail.com> | 2017-03-19 04:40:42 +0000 |
|---|---|---|
| committer | Brian Gesiak <modocache@gmail.com> | 2017-03-19 04:40:42 +0000 |
| commit | 1640e687280e653947811f4305f021be8f9472e5 (patch) | |
| tree | e21109cae181ee557a35c5ece1c1b502d43bb915 /llvm/lib | |
| parent | 662c9b1e81ae198cf6b609f4348d9e469ceba6a9 (diff) | |
| download | bcm5719-llvm-1640e687280e653947811f4305f021be8f9472e5.tar.gz bcm5719-llvm-1640e687280e653947811f4305f021be8f9472e5.zip | |
[Analysis] bitreverse(undef) returns undef
Summary:
The reverse of an artbitrary bitpattern is also an arbitrary
bitpattern.
Reviewers: trentxintong, arsenm, majnemer
Reviewed By: majnemer
Subscribers: majnemer, wdng, llvm-commits
Differential Revision: https://reviews.llvm.org/D31118
llvm-svn: 298201
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Analysis/ConstantFolding.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp index 6d8d4a1c3e9..85ca622a25d 100644 --- a/llvm/lib/Analysis/ConstantFolding.cpp +++ b/llvm/lib/Analysis/ConstantFolding.cpp @@ -1768,7 +1768,8 @@ Constant *ConstantFoldScalarCall(StringRef Name, unsigned IntrinsicID, Type *Ty, } if (isa<UndefValue>(Operands[0])) { - if (IntrinsicID == Intrinsic::bswap) + if (IntrinsicID == Intrinsic::bswap || + IntrinsicID == Intrinsic::bitreverse) return Operands[0]; return nullptr; } |
