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Don't look for empty live ranges in the unions.

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Empty live ranges represent undef and still get allocated, but they
won't appear in LiveIntervalUnions.

Patch by Patrik Hägglund!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156685 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-05-12 00:33:28 +00:00
parent 27ba61df9f
commit 2b3fa322b8
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/RegAllocBase.cpp
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@ -69,11 +69,14 @@ void RegAllocBase::verify() {
for (LiveIntervals::iterator liItr = LIS->begin(), liEnd = LIS->end();
liItr != liEnd; ++liItr) {
unsigned reg = liItr->first;
LiveInterval* li = liItr->second;
if (TargetRegisterInfo::isPhysicalRegister(reg)) continue;
if (!VRM->hasPhys(reg)) continue; // spilled?
if (li->empty()) continue; // unionVRegs will only be filled if li is
// non-empty
unsigned PhysReg = VRM->getPhys(reg);
if (!unionVRegs[PhysReg].test(reg)) {
dbgs() << "LiveVirtReg " << reg << " not in union " <<
dbgs() << "LiveVirtReg " << PrintReg(reg, TRI) << " not in union " <<
TRI->getName(PhysReg) << "\n";
llvm_unreachable("unallocated live vreg");
}