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Swap exit condition operands if it works.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41817 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-09-10 23:34:06 +00:00
parent 569f7371d6
commit 0c0f7c935b
1 changed files with 15 additions and 5 deletions
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16
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -329,13 +329,23 @@ void LoopIndexSplit::findLoopConditionals() {
return;
// 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)
|| 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;