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Fix a bug where we were counting the alias sets as completely used

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registers for fast allocation a different way. This has us updating
used registers only when we're using that exact register.

Fixes rdar://9207598



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129711 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2011-04-18 19:26:25 +00:00
parent 3b55a372d4
commit d574bb5a6e
2 changed files with 15 additions and 5 deletions
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5
lib/CodeGen/RegAllocFast.cpp
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@@ -396,7 +396,6 @@ void RAFast::definePhysReg(MachineInstr *MI, unsigned PhysReg,
PhysRegState[PhysReg] = NewState;
for (const unsigned *AS = TRI->getAliasSet(PhysReg);
unsigned Alias = *AS; ++AS) {
UsedInInstr.set(Alias);
switch (unsigned VirtReg = PhysRegState[Alias]) {
case regDisabled:
break;
@@ -734,10 +733,6 @@ void RAFast::handleThroughOperands(MachineInstr *MI,
if (!Reg || !TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
DEBUG(dbgs() << "\tSetting reg " << Reg << " as used in instr\n");
UsedInInstr.set(Reg);
for (const unsigned *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
DEBUG(dbgs() << "\tSetting alias reg " << *AS << " as used in instr\n");
UsedInInstr.set(*AS);
}
}
// Also mark PartialDefs as used to avoid reallocation.