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Remove check which is duplicated in

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InstCombiner::visitSelectInstWithICmp.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75409 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-07-12 02:00:05 +00:00
parent a6d16ae432
commit 6db1495558
1 changed files with 0 additions and 20 deletions
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20
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -9474,26 +9474,6 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
}
if (ICmpInst *IC = dyn_cast<ICmpInst>(SI.getCondition())) {
// (x <s 0) ? -1 : 0 -> ashr x, 31
if (TrueValC->isAllOnesValue() && FalseValC->isZero())
if (ConstantInt *CmpCst = dyn_cast<ConstantInt>(IC->getOperand(1))) {
if (IC->getPredicate() == ICmpInst::ICMP_SLT && CmpCst->isZero()) {
// The comparison constant and the result are not neccessarily the
// same width. Make an all-ones value by inserting a AShr.
Value *X = IC->getOperand(0);
uint32_t Bits = X->getType()->getScalarSizeInBits();
Constant *ShAmt = Context->getConstantInt(X->getType(), Bits-1);
Instruction *SRA = BinaryOperator::Create(Instruction::AShr, X,
ShAmt, "ones");
InsertNewInstBefore(SRA, SI);
// Then cast to the appropriate width.
return CastInst::CreateIntegerCast(SRA, SI.getType(), true);
}
}
// If one of the constants is zero (we know they can't both be) and we
// have an icmp instruction with zero, and we have an 'and' with the
// non-constant value, eliminate this whole mess. This corresponds to