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It is OK to remove extra cast if operation is EQ/NE even though source

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and destination sign may not match but other conditions are met.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31056 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2006-10-19 20:59:13 +00:00
parent df308fa7ab
commit 002e499650
2 changed files with 12 additions and 2 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4795,8 +4795,9 @@ Instruction *InstCombiner::visitSetCondInstWithCastAndCast(SetCondInst &SCI) {
// %B = setgt short %X, 1330
//
// because %A may have negative value.
// However, it is OK if SrcTy is bool. See cast-set.ll testcase.
if (isSignSrc == isSignDest || SrcTy == Type::BoolTy)
// However, it is OK if SrcTy is bool (See cast-set.ll testcase)
// OR operation is EQ/NE.
if (isSignSrc == isSignDest || SrcTy == Type::BoolTy || SCI.isEquality())
RHSCIOp = Res;
else
return 0;