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Bugs: missing partial uses and redundant partial defs.

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llvm-svn: 40688
This commit is contained in:
Evan Cheng 2007-08-01 20:18:21 +00:00
parent 699e4b2dec
commit d6d66f0cf4
1 changed files with 20 additions and 4 deletions
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22
lib/CodeGen/LiveVariables.cpp
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@ -281,11 +281,25 @@ void LiveVariables::HandlePhysRegUse(unsigned Reg, MachineInstr *MI) {
PhysRegUsed[SubReg] = true;
}
// Remember the partial uses.
for (const unsigned *SuperRegs = RegInfo->getSuperRegisters(Reg);
unsigned SuperReg = *SuperRegs; ++SuperRegs)
unsigned SuperReg = *SuperRegs; ++SuperRegs) {
// Remember the partial use of this superreg if it was previously defined.
bool HasPrevDef = PhysRegInfo[SuperReg] != NULL;
if (!HasPrevDef) {
for (const unsigned *SSRegs = RegInfo->getSuperRegisters(SuperReg);
unsigned SSReg = *SSRegs; ++SSRegs) {
if (PhysRegInfo[SSReg] != NULL) {
HasPrevDef = true;
break;
}
}
}
if (HasPrevDef) {
PhysRegInfo[SuperReg] = MI;
PhysRegPartUse[SuperReg] = MI;
}
}
}
bool LiveVariables::HandlePhysRegKill(unsigned Reg, MachineInstr *RefMI,
SmallSet<unsigned, 4> &SubKills) {
@ -342,7 +356,7 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
addRegisterKilled(Reg, PhysRegPartUse[Reg], true);
}
} else if (PhysRegPartUse[Reg])
// Add implicit use / kill to last use of a sub-register.
// Add implicit use / kill to last partial use.
addRegisterKilled(Reg, PhysRegPartUse[Reg], true);
else
addRegisterDead(Reg, LastRef);
@ -385,11 +399,13 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
PhysRegInfo[Reg] = MI;
PhysRegUsed[Reg] = false;
PhysRegPartDef[Reg].clear();
PhysRegPartUse[Reg] = NULL;
for (const unsigned *SubRegs = RegInfo->getSubRegisters(Reg);
unsigned SubReg = *SubRegs; ++SubRegs) {
PhysRegInfo[SubReg] = MI;
PhysRegUsed[SubReg] = false;
PhysRegPartDef[SubReg].clear();
PhysRegPartUse[SubReg] = NULL;
}
}