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fix an oversight caught by Frits!

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llvm-svn: 122204
This commit is contained in:
Chris Lattner 2010-12-19 23:24:04 +00:00
parent 41ed6e3571
commit c8327b2f7c
1 changed files with 4 additions and 3 deletions
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7
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -1151,9 +1151,10 @@ Instruction *InstCombiner::visitExtractValueInst(ExtractValueInst &EV) {
// If the normal result of the add is dead, and the RHS is a constant,
// we can transform this into a range comparison.
// overflow = uadd a, -4 --> overflow = icmp ugt a, 3
if (ConstantInt *CI = dyn_cast<ConstantInt>(II->getArgOperand(1)))
return new ICmpInst(ICmpInst::ICMP_UGT, II->getArgOperand(0),
ConstantExpr::getNot(CI));
if (II->getIntrinsicID() == Intrinsic::uadd_with_overflow)
if (ConstantInt *CI = dyn_cast<ConstantInt>(II->getArgOperand(1)))
return new ICmpInst(ICmpInst::ICMP_UGT, II->getArgOperand(0),
ConstantExpr::getNot(CI));
break;
case Intrinsic::usub_with_overflow:
case Intrinsic::ssub_with_overflow: