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move a zext specific xform out of commonIntCastTransforms into visitZExt and modernize it.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92770 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-05 21:04:47 +00:00
parent b31defe94c
commit 718bf3f89d
1 changed files with 9 additions and 10 deletions
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19
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -645,16 +645,6 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
cast<BinaryOperator>(SrcI)->getOpcode(), Op0c, Op1c);
}
}
// cast (xor bool X, true) to int --> xor (cast bool X to int), 1
if (isa<ZExtInst>(CI) && SrcBitSize == 1 &&
SrcI->getOpcode() == Instruction::Xor &&
Op1 == ConstantInt::getTrue(CI.getContext()) &&
(!Op0->hasOneUse() || !isa<CmpInst>(Op0))) {
Value *New = Builder->CreateZExt(Op0, DestTy, Op0->getName());
return BinaryOperator::CreateXor(New,
ConstantInt::get(CI.getType(), 1));
}
break;
}
return 0;
@ -933,6 +923,15 @@ Instruction *InstCombiner::visitZExt(ZExtInst &CI) {
}
}
// zext (xor i1 X, true) to i32 --> xor (zext i1 X to i32), 1
Value *X;
if (SrcI && SrcI->getType()->isInteger(1) &&
match(SrcI, m_Not(m_Value(X))) &&
(!X->hasOneUse() || !isa<CmpInst>(X))) {
Value *New = Builder->CreateZExt(X, CI.getType());
return BinaryOperator::CreateXor(New, ConstantInt::get(CI.getType(), 1));
}
return 0;
}