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fix Transforms/InstCombine/2007-05-10-icmp-or.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36984 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-11 05:55:56 +00:00
parent 2e3ce7d97a
commit 8885887b9c
1 changed files with 10 additions and 5 deletions
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15
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3919,13 +3919,18 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
LHSCC != ICmpInst::ICMP_UGE && LHSCC != ICmpInst::ICMP_ULE &&
RHSCC != ICmpInst::ICMP_UGE && RHSCC != ICmpInst::ICMP_ULE &&
LHSCC != ICmpInst::ICMP_SGE && LHSCC != ICmpInst::ICMP_SLE &&
RHSCC != ICmpInst::ICMP_SGE && RHSCC != ICmpInst::ICMP_SLE) {
RHSCC != ICmpInst::ICMP_SGE && RHSCC != ICmpInst::ICMP_SLE &&
// We can't fold (ugt x, C) | (sgt x, C2).
PredicatesFoldable(LHSCC, RHSCC)) {
// Ensure that the larger constant is on the RHS.
ICmpInst::Predicate GT = ICmpInst::isSignedPredicate(LHSCC) ?
ICmpInst::ICMP_SGT : ICmpInst::ICMP_UGT;
Constant *Cmp = ConstantExpr::getICmp(GT, LHSCst, RHSCst);
ICmpInst *LHS = cast<ICmpInst>(Op0);
if (cast<ConstantInt>(Cmp)->getZExtValue()) {
bool NeedsSwap;
if (ICmpInst::isSignedPredicate(LHSCC))
NeedsSwap = LHSCst->getValue().sgt(LHSCst->getValue());
else
NeedsSwap = LHSCst->getValue().ugt(LHSCst->getValue());
if (NeedsSwap) {
std::swap(LHS, RHS);
std::swap(LHSCst, RHSCst);
std::swap(LHSCC, RHSCC);