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eliminate an unneeded branch, part of PR12357 

llvm-svn: 153458
This commit is contained in:
Chris Lattner 2012-03-26 19:13:57 +00:00
parent 9e4e335281
commit b1e2e1e091
1 changed files with 2 additions and 7 deletions
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9
llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -1362,13 +1362,8 @@ static bool CollectBSwapParts(Value *V, int OverallLeftShift, uint32_t ByteMask,
// part of the value (e.g. byte 3) then it must be shifted right. If from the
// low part, it must be shifted left.
unsigned DestByteNo = InputByteNo + OverallLeftShift;
if (InputByteNo < ByteValues.size()/2) {
if (ByteValues.size()-1-DestByteNo != InputByteNo)
return true;
} else {
if (ByteValues.size()-1-DestByteNo != InputByteNo)
return true;
}
if (ByteValues.size()-1-DestByteNo != InputByteNo)
return true;
// If the destination byte value is already defined, the values are or'd
// together, which isn't a bswap (unless it's an or of the same bits).