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Swap exit condition operands if it works.

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llvm-svn: 41817
This commit is contained in:
Devang Patel 2007-09-10 23:34:06 +00:00
parent 9f93ab3579
commit ce76c29be0
1 changed files with 15 additions and 5 deletions
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20
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -328,14 +328,24 @@ void LoopIndexSplit::findLoopConditionals() {
if (!CI)
return;
// FIXME
// FIXME
if (CI->getPredicate() == ICmpInst::ICMP_EQ
|| CI->getPredicate() == ICmpInst::ICMP_NE)
return;
if (CI->getPredicate() == ICmpInst::ICMP_SGT
|| CI->getPredicate() == ICmpInst::ICMP_UGT
|| CI->getPredicate() == ICmpInst::ICMP_SGE
|| CI->getPredicate() == ICmpInst::ICMP_UGE
|| CI->getPredicate() == ICmpInst::ICMP_EQ
|| CI->getPredicate() == ICmpInst::ICMP_NE)
return;
|| CI->getPredicate() == ICmpInst::ICMP_UGE) {
BasicBlock *FirstSuccessor = BR->getSuccessor(0);
// splitLoop() is expecting LT/LE as exit condition predicate.
// Swap operands here if possible to meet this requirement.
if (!L->contains(FirstSuccessor))
CI->swapOperands();
else
return;
}
ExitCondition = CI;