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If BB is predicated, invalidate its predecessor(s) which would if-convert it. It needs to be re-analyzed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37580 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-06-14 23:13:19 +00:00
parent 51eaa86758
commit e37e24331c
1 changed files with 7 additions and 3 deletions
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10
lib/CodeGen/IfConversion.cpp
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@ -656,15 +656,19 @@ static bool canFallThroughTo(MachineBasicBlock *BB, MachineBasicBlock *ToBB) {
}
/// ReTryPreds - Invalidate predecessor BB info so it would be re-analyzed
/// to determine if it can be if-converted.
/// to determine if it can be if-converted. If predecessor is already
/// enqueud, dequeue it!
void IfConverter::ReTryPreds(MachineBasicBlock *BB) {
for (MachineBasicBlock::pred_iterator PI = BB->pred_begin(),
E = BB->pred_end(); PI != E; ++PI) {
BBInfo &PBBI = BBAnalysis[(*PI)->getNumber()];
if (!PBBI.IsDone && PBBI.Kind == ICNotClassfied) {
if (PBBI.IsDone)
continue;
if (PBBI.Kind == ICNotClassfied) {
assert(!PBBI.IsEnqueued && "Unexpected");
PBBI.IsAnalyzed = false;
}
} else if (PBBI.IsEnqueued && PBBI.BB != BB)
PBBI.IsEnqueued = false;
}
}