6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-09-12 01:25:10 +00:00
Code Issues Projects Releases Wiki Activity

Change MRegisterDesc::AliasSet, TargetInstrDescriptor::ImplicitDefs

Browse Source 
and TargetInstrDescriptor::ImplicitUses to always point to a null
terminated array and never be null. So there is no need to check for
pointer validity when iterating over those sets. Code that looked
like:

if (const unsigned* AS = TID.ImplicitDefs) {
  for (int i = 0; AS[i]; ++i) {
    // use AS[i]
  }
}

was changed to:

for (const unsigned* AS = TID.ImplicitDefs; *AS; ++AS) {
  // use *AS
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos
2003-10-08 05:20:08 +00:00
parent 6b8b22585c
commit 73ff5120eb
6 changed files with 64 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
lib/CodeGen/LiveVariables.cpp
View File

@@ -108,12 +108,14 @@ void LiveVariables::HandlePhysRegUse(unsigned Reg, MachineInstr *MI) {
if (PhysRegInfo[Reg]) {
PhysRegInfo[Reg] = MI;
PhysRegUsed[Reg] = true;
} else if (const unsigned *AliasSet = RegInfo->getAliasSet(Reg)) {
for (; unsigned NReg = AliasSet[0]; ++AliasSet)
if (MachineInstr *LastUse = PhysRegInfo[NReg]) {
PhysRegInfo[NReg] = MI;
PhysRegUsed[NReg] = true;
} else {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) {
if (MachineInstr *LastUse = PhysRegInfo[*AliasSet]) {
PhysRegInfo[*AliasSet] = MI;
PhysRegUsed[*AliasSet] = true;
}
}
}
}
@@ -124,15 +126,17 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
RegistersKilled.insert(std::make_pair(LastUse, Reg));
else
RegistersDead.insert(std::make_pair(LastUse, Reg));
} else if (const unsigned *AliasSet = RegInfo->getAliasSet(Reg)) {
for (; unsigned NReg = AliasSet[0]; ++AliasSet)
if (MachineInstr *LastUse = PhysRegInfo[NReg]) {
if (PhysRegUsed[NReg])
RegistersKilled.insert(std::make_pair(LastUse, NReg));
} else {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) {
if (MachineInstr *LastUse = PhysRegInfo[*AliasSet]) {
if (PhysRegUsed[*AliasSet])
RegistersKilled.insert(std::make_pair(LastUse, *AliasSet));
else
RegistersDead.insert(std::make_pair(LastUse, NReg));
PhysRegInfo[NReg] = 0; // Kill the aliased register
RegistersDead.insert(std::make_pair(LastUse, *AliasSet));
PhysRegInfo[*AliasSet] = 0; // Kill the aliased register
}
}
}
PhysRegInfo[Reg] = MI;
PhysRegUsed[Reg] = false;
@@ -206,9 +210,9 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
NumOperandsToProcess = 1;
// Loop over implicit uses, using them.
if (const unsigned *ImplicitUses = MID.ImplicitUses)
for (unsigned i = 0; ImplicitUses[i]; ++i)
HandlePhysRegUse(ImplicitUses[i], MI);
for (const unsigned *ImplicitUses = MID.ImplicitUses;
*ImplicitUses; ++ImplicitUses)
HandlePhysRegUse(*ImplicitUses, MI);
// Process all explicit uses...
for (unsigned i = 0; i != NumOperandsToProcess; ++i) {