/// getFreePhysReg - return a free physical register for this virtual register
/// interval if we have one, otherwise return 0.
unsigned RALinScan::getFreePhysReg(LiveInterval *cur) {
- std::vector<unsigned> inactiveCounts(tri_->getNumRegs(), 0);
+ SmallVector<unsigned, 256> inactiveCounts;
unsigned MaxInactiveCount = 0;
const TargetRegisterClass *RC = reginfo_->getRegClass(cur->reg);
const TargetRegisterClass *RegRC = reginfo_->getRegClass(reg);
if (RelatedRegClasses.getLeaderValue(RegRC) == RCLeader) {
reg = vrm_->getPhys(reg);
+ if (inactiveCounts.size() <= reg)
+ inactiveCounts.resize(reg+1);
++inactiveCounts[reg];
MaxInactiveCount = std::max(MaxInactiveCount, inactiveCounts[reg]);
}
for (; I != E; ++I)
if (prt_->isRegAvail(*I)) {
FreeReg = *I;
- FreeRegInactiveCount = inactiveCounts[FreeReg];
+ if (FreeReg < inactiveCounts.size())
+ FreeRegInactiveCount = inactiveCounts[FreeReg];
+ else
+ FreeRegInactiveCount = 0;
break;
}
-
+
// If there are no free regs, or if this reg has the max inactive count,
// return this register.
if (FreeReg == 0 || FreeRegInactiveCount == MaxInactiveCount) return FreeReg;
// reevaluated now.
for (; I != E; ++I) {
unsigned Reg = *I;
- if (prt_->isRegAvail(Reg) && FreeRegInactiveCount < inactiveCounts[Reg]) {
+ if (prt_->isRegAvail(Reg) && Reg < inactiveCounts.size() &&
+ FreeRegInactiveCount < inactiveCounts[Reg]) {
FreeReg = Reg;
FreeRegInactiveCount = inactiveCounts[Reg];
if (FreeRegInactiveCount == MaxInactiveCount)