/// isPhysRegUsed - Return true if the specified register is used in this
/// function. This only works after register allocation.
bool isPhysRegUsed(unsigned Reg) const { return UsedPhysRegs[Reg]; }
-
+
+ /// isPhysRegOrOverlapUsed - Return true if Reg or any overlapping register
+ /// is used in this function.
+ bool isPhysRegOrOverlapUsed(unsigned Reg) const {
+ for (const unsigned *AI = TRI->getOverlaps(Reg); *AI; ++AI)
+ if (isPhysRegUsed(*AI))
+ return true;
+ return false;
+ }
+
/// setPhysRegUsed - Mark the specified register used in this function.
/// This should only be called during and after register allocation.
void setPhysRegUsed(unsigned Reg) { UsedPhysRegs[Reg] = true; }
bool anyregs = false;
for (TargetRegisterClass::const_iterator I = RC->begin(), E = RC->end();
I != E; ++I)
- for (const unsigned *AI = TRI->getOverlaps(*I); *AI; ++AI)
- if (MF->getRegInfo().isPhysRegUsed(*AI)) {
- anyregs = true;
- break;
- }
+ if (MF->getRegInfo().isPhysRegOrOverlapUsed(*I)) {
+ anyregs = true;
+ break;
+ }
if (!anyregs) return false;
// Initialize the AliasMap on the first use.
std::vector<CalleeSavedInfo> CSI;
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
- if (Fn.getRegInfo().isPhysRegUsed(Reg)) {
+ if (Fn.getRegInfo().isPhysRegOrOverlapUsed(Reg)) {
// If the reg is modified, save it!
CSI.push_back(CalleeSavedInfo(Reg));
- } else {
- for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
- *AliasSet; ++AliasSet) { // Check alias registers too.
- if (Fn.getRegInfo().isPhysRegUsed(*AliasSet)) {
- CSI.push_back(CalleeSavedInfo(Reg));
- break;
- }
- }
}
}
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
bool Spilled = false;
- if (MF.getRegInfo().isPhysRegUsed(Reg)) {
+ if (MF.getRegInfo().isPhysRegOrOverlapUsed(Reg)) {
Spilled = true;
CanEliminateFrame = false;
- } else {
- // Check alias registers too.
- for (const unsigned *Aliases =
- RegInfo->getAliasSet(Reg); *Aliases; ++Aliases) {
- if (MF.getRegInfo().isPhysRegUsed(*Aliases)) {
- Spilled = true;
- CanEliminateFrame = false;
- }
- }
}
if (!ARM::GPRRegisterClass->contains(Reg))