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Fix TableGen's RegPressureSet weight normalization to handle subreg DAGS.

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I initially assumed that the subreg graph was a tree. That may not be true.

llvm-svn: 156524
This commit is contained in:
Andrew Trick 2012-05-10 00:32:15 +00:00
parent 29d464dff0
commit ac3b83d82b
1 changed files with 9 additions and 4 deletions
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13
utils/TableGen/CodeGenRegisters.cpp
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@ -1053,17 +1053,21 @@ static void computeUberWeights(std::vector<UberRegSet> &UberSets,
static bool normalizeWeight(CodeGenRegister *Reg, static bool normalizeWeight(CodeGenRegister *Reg,
std::vector<UberRegSet> &UberSets, std::vector<UberRegSet> &UberSets,
std::vector<UberRegSet*> &RegSets, std::vector<UberRegSet*> &RegSets,
std::set<unsigned> &NormalRegs,
CodeGenRegister::RegUnitList &NormalUnits, CodeGenRegister::RegUnitList &NormalUnits,
CodeGenRegBank &RegBank) { CodeGenRegBank &RegBank) {
bool Changed = false; bool Changed = false;
if (!NormalRegs.insert(Reg->EnumValue).second)
return Changed;
const CodeGenRegister::SubRegMap &SRM = Reg->getSubRegs(); const CodeGenRegister::SubRegMap &SRM = Reg->getSubRegs();
for (CodeGenRegister::SubRegMap::const_iterator SRI = SRM.begin(), for (CodeGenRegister::SubRegMap::const_iterator SRI = SRM.begin(),
SRE = SRM.end(); SRI != SRE; ++SRI) { SRE = SRM.end(); SRI != SRE; ++SRI) {
if (SRI->second == Reg) if (SRI->second == Reg)
continue; // self-cycles happen continue; // self-cycles happen
Changed |= Changed |= normalizeWeight(SRI->second, UberSets, RegSets,
normalizeWeight(SRI->second, UberSets, RegSets, NormalUnits, RegBank); NormalRegs, NormalUnits, RegBank);
} }
// Postorder register normalization. // Postorder register normalization.
@ -1128,8 +1132,9 @@ void CodeGenRegBank::computeRegUnitWeights() {
Changed = false; Changed = false;
for (unsigned i = 0, e = Registers.size(); i != e; ++i) { for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
CodeGenRegister::RegUnitList NormalUnits; CodeGenRegister::RegUnitList NormalUnits;
Changed |= std::set<unsigned> NormalRegs;
normalizeWeight(Registers[i], UberSets, RegSets, NormalUnits, *this); Changed |= normalizeWeight(Registers[i], UberSets, RegSets,
NormalRegs, NormalUnits, *this);
} }
} }
} }