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Fix bug in aggressive antidep breaking; liveness was not updated correctly for regions that do not have antidep candidates.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86172 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Goodwin 2009-11-05 21:06:09 +00:00
parent 692ad8dd06
commit 7040d6e2f5
1 changed files with 7 additions and 10 deletions
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17
lib/CodeGen/AggressiveAntiDepBreaker.cpp
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@ -630,12 +630,6 @@ unsigned AggressiveAntiDepBreaker::BreakAntiDependencies(
std::multimap<unsigned, AggressiveAntiDepState::RegisterReference>&
RegRefs = State->GetRegRefs();
// Nothing to do if no candidates.
if (Candidates.empty()) {
DEBUG(errs() << "\n===== No anti-dependency candidates\n");
return 0;
}
// The code below assumes that there is at least one instruction,
// so just duck out immediately if the block is empty.
if (SUnits.empty()) return 0;
@ -655,16 +649,19 @@ unsigned AggressiveAntiDepBreaker::BreakAntiDependencies(
// ...need a map from MI to SUnit.
std::map<MachineInstr *, SUnit *> MISUnitMap;
DEBUG(errs() << "\n===== Attempting to break " << Candidates.size() <<
" anti-dependencies\n");
for (unsigned i = 0, e = SUnits.size(); i != e; ++i) {
SUnit *SU = &SUnits[i];
MISUnitMap.insert(std::pair<MachineInstr *, SUnit *>(SU->getInstr(), SU));
}
// Even if there are no anti-dependencies we still need to go
// through the instructions to update Def, Kills, etc.
#ifndef NDEBUG
{
if (Candidates.empty()) {
DEBUG(errs() << "\n===== No anti-dependency candidates\n");
} else {
DEBUG(errs() << "\n===== Attempting to break " << Candidates.size() <<
" anti-dependencies\n");
DEBUG(errs() << "Available regs:");
for (unsigned Reg = 0; Reg < TRI->getNumRegs(); ++Reg) {
if (!State->IsLive(Reg))