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Teach iff-converter to properly count # of dups. It was not skipping over dbg_value's which resulted in non-duplicated instructions being deleted. rdar://8104384.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106323 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-06-18 21:52:57 +00:00
parent e03262fcfc
commit a9934dc20a
1 changed files with 27 additions and 1 deletions
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28
lib/CodeGen/IfConversion.cpp
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@ -531,6 +531,19 @@ bool IfConverter::ValidDiamond(BBInfo &TrueBBI, BBInfo &FalseBBI,
while (FI != FIE && FI->isDebugValue())
++FI;
while (TI != TIE && FI != FIE) {
// Skip dbg_value instructions. These do not count.
if (TI->isDebugValue()) {
while (TI != TIE && TI->isDebugValue())
++TI;
if (TI == TIE)
break;
}
if (FI->isDebugValue()) {
while (FI != FIE && FI->isDebugValue())
++FI;
if (FI == FIE)
break;
}
if (!TI->isIdenticalTo(FI))
break;
++Dups1;
@ -542,12 +555,25 @@ bool IfConverter::ValidDiamond(BBInfo &TrueBBI, BBInfo &FalseBBI,
FI = firstNonBranchInst(FalseBBI.BB, TII);
MachineBasicBlock::iterator TIB = TrueBBI.BB->begin();
MachineBasicBlock::iterator FIB = FalseBBI.BB->begin();
// Skip dbg_value instructions
// Skip dbg_value instructions at end of the bb's.
while (TI != TIB && TI->isDebugValue())
--TI;
while (FI != FIB && FI->isDebugValue())
--FI;
while (TI != TIB && FI != FIB) {
// Skip dbg_value instructions. These do not count.
if (TI->isDebugValue()) {
while (TI != TIB && TI->isDebugValue())
--TI;
if (TI == TIB)
break;
}
if (FI->isDebugValue()) {
while (FI != FIB && FI->isDebugValue())
--FI;
if (FI == FIB)
break;
}
if (!TI->isIdenticalTo(FI))
break;
++Dups2;