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Fold bswap(undef) to undef.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96432 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-02-17 00:54:58 +00:00
parent 378c0b35a7
commit 9ee7123ab4
2 changed files with 12 additions and 0 deletions
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6
lib/Analysis/ConstantFolding.cpp
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@ -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;
}