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Patch to fix PR337. Make sure to mark all aliased physical registers as used

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when we see a read of a register.  This is important in cases like:

AL = ...
AH = ...

   = AX

The read of AX must make both the AL and AH defs live until the use.

llvm-svn: 13444
This commit is contained in:
Chris Lattner 2004-05-10 05:12:43 +00:00
parent 35e874420b
commit b37490a331
1 changed files with 8 additions and 3 deletions
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11
lib/CodeGen/LiveVariables.cpp
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@ -126,6 +126,12 @@ void LiveVariables::HandleVirtRegUse(VarInfo &VRInfo, MachineBasicBlock *MBB,
void LiveVariables::HandlePhysRegUse(unsigned Reg, MachineInstr *MI) {
PhysRegInfo[Reg] = MI;
PhysRegUsed[Reg] = true;
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
unsigned Alias = *AliasSet; ++AliasSet) {
PhysRegInfo[Alias] = MI;
PhysRegUsed[Alias] = true;
}
}
void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
@ -140,11 +146,10 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
PhysRegUsed[Reg] = false;
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) {
unsigned Alias = *AliasSet;
unsigned Alias = *AliasSet; ++AliasSet) {
if (MachineInstr *LastUse = PhysRegInfo[Alias]) {
if (PhysRegUsed[Alias])
RegistersKilled.insert(std::make_pair(LastUse, Alias));
RegistersKilled.insert(std::make_pair(LastUse, Alias));
else
RegistersDead.insert(std::make_pair(LastUse, Alias));
}