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fix a bug where the bswap matcher could match a case involving

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ashr.  It should only apply to lshr.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57089 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-10-05 00:50:57 +00:00
parent 31d7161206
commit 2f63ca3fa8
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3912,9 +3912,12 @@ static bool CollectBSwapParts(Value *V, SmallVector<Value*, 8> &ByteValues) {
if (I->getOpcode() == Instruction::Shl) {
// X << 24 defines the top byte with the lowest of the input bytes.
DestNo = ByteValues.size()-1;
} else {
} else if (I->getOpcode() == Instruction::LShr) {
// X >>u 24 defines the low byte with the highest of the input bytes.
DestNo = 0;
} else {
// Arithmetic shift right may have the top bits set.
return true;
}
// If the destination byte value is already defined, the values are or'd