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| author | Dan Gohman <gohman@apple.com> | 2010-02-17 00:54:58 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-02-17 00:54:58 +0000 |
| commit | 9ee7123ab462d97a2b242280e9bf0b47883531cb (patch) | |
| tree | 3588eaffa989e094b90f3caa5a668d725949a594 /lib/Analysis/ConstantFolding.cpp | |
| parent | 378c0b35a7b9884f1de2a9762825424fbf1813ac (diff) | |
Fold bswap(undef) to undef.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96432 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ConstantFolding.cpp')
| -rw-r--r-- | lib/Analysis/ConstantFolding.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp index 6bab5eca20..676a8466ac 100644 --- a/lib/Analysis/ConstantFolding.cpp +++ b/lib/Analysis/ConstantFolding.cpp @@ -1179,6 +1179,12 @@ llvm::ConstantFoldCall(Function *F, return 0; } + if (isa<UndefValue>(Operands[0])) { + if (Name.startswith("llvm.bswap")) + return Operands[0]; + return 0; + } + return 0; } |