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More dbg_value cleanup so the presence of debug info doesn't affect code-gen.

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Make sure to skip the dbg_value instructions when moving dups out of the
diamond. rdar://7797940

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105965 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-06-14 21:30:32 +00:00
parent 38a979bf95
commit c834f413ae
1 changed files with 21 additions and 2 deletions
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23
lib/CodeGen/IfConversion.cpp
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@ -1091,6 +1091,13 @@ bool IfConverter::IfConvertDiamond(BBInfo &BBI, IfcvtKind Kind,
// Remove the duplicated instructions at the beginnings of both paths.
MachineBasicBlock::iterator DI1 = BBI1->BB->begin();
MachineBasicBlock::iterator DI2 = BBI2->BB->begin();
MachineBasicBlock::iterator DIE1 = BBI1->BB->end();
MachineBasicBlock::iterator DIE2 = BBI2->BB->end();
// Skip dbg_value instructions
while (DI1 != DIE1 && DI1->isDebugValue())
++DI1;
while (DI2 != DIE2 && DI2->isDebugValue())
++DI2;
BBI1->NonPredSize -= NumDups1;
BBI2->NonPredSize -= NumDups1;
while (NumDups1 != 0) {
@ -1104,8 +1111,15 @@ bool IfConverter::IfConvertDiamond(BBInfo &BBI, IfcvtKind Kind,
// Predicate the 'true' block after removing its branch.
BBI1->NonPredSize -= TII->RemoveBranch(*BBI1->BB);
DI1 = BBI1->BB->end();
for (unsigned i = 0; i != NumDups2; ++i)
for (unsigned i = 0; i != NumDups2; ) {
// NumDups2 only counted non-dbg_value instructions, so this won't
// run off the head of the list.
assert (DI1 != BBI1->BB->begin());
--DI1;
// skip dbg_value instructions
if (!DI1->isDebugValue())
++i;
}
BBI1->BB->erase(DI1, BBI1->BB->end());
PredicateBlock(*BBI1, BBI1->BB->end(), *Cond1);
@ -1113,8 +1127,13 @@ bool IfConverter::IfConvertDiamond(BBInfo &BBI, IfcvtKind Kind,
BBI2->NonPredSize -= TII->RemoveBranch(*BBI2->BB);
DI2 = BBI2->BB->end();
while (NumDups2 != 0) {
// NumDups2 only counted non-dbg_value instructions, so this won't
// run off the head of the list.
assert (DI2 != BBI2->BB->begin());
--DI2;
--NumDups2;
// skip dbg_value instructions
if (!DI2->isDebugValue())
--NumDups2;
}
PredicateBlock(*BBI2, DI2, *Cond2);