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Change MRegisterDesc::AliasSet, TargetInstrDescriptor::ImplicitDefs

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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
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9
lib/CodeGen/PrologEpilogInserter.cpp
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@@ -127,12 +127,15 @@ void PEI::saveCallerSavedRegisters(MachineFunction &Fn) {
unsigned Reg = CSRegs[i];
if (ModifiedRegs[Reg]) {
RegsToSave.push_back(Reg); // If modified register...
} else if (const unsigned *AliasSet = RegInfo->getAliasSet(Reg))
for (unsigned j = 0; AliasSet[j]; ++j) // Check alias registers too...
if (ModifiedRegs[AliasSet[j]]) {
} else {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) { // Check alias registers too...
if (ModifiedRegs[*AliasSet]) {
RegsToSave.push_back(Reg);
break;
}
}
}
}
if (RegsToSave.empty())