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minor cleanup and add clarifying comment 

llvm-svn: 83117
This commit is contained in:
Jim Grosbach 2009-09-29 23:17:20 +00:00
parent a192536ebe
commit fa6847f099
1 changed files with 9 additions and 7 deletions
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16
llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
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@ -668,13 +668,15 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
NumExtras--;
}
}
while (NumExtras && !UnspilledCS2GPRs.empty() &&
!AFI->isThumb1OnlyFunction()) {
unsigned Reg = UnspilledCS2GPRs.back();
UnspilledCS2GPRs.pop_back();
if (!isReservedReg(MF, Reg)) {
Extras.push_back(Reg);
NumExtras--;
// For non-Thumb1 functions, also check for hi-reg CS registers
if (!AFI->isThumb1OnlyFunction()) {
while (NumExtras && !UnspilledCS2GPRs.empty()) {
unsigned Reg = UnspilledCS2GPRs.back();
UnspilledCS2GPRs.pop_back();
if (!isReservedReg(MF, Reg)) {
Extras.push_back(Reg);
NumExtras--;
}
}
}
if (Extras.size() && NumExtras == 0) {