- bool isLoad = false;
- SmallVector<LiveInterval*, 4> spillIs;
- if (lis_.isReMaterializable(li, spillIs, isLoad)) {
- if (isLoad)
- totalWeight *= 0.9F;
- else
- totalWeight *= 0.5F;
- }
-
- li.weight = totalWeight;
- lis_.normalizeSpillWeight(li);
-}
-
-void VirtRegAuxInfo::CalculateRegClass(unsigned reg) {
- MachineRegisterInfo &mri = mf_.getRegInfo();
- const TargetRegisterInfo *tri = mf_.getTarget().getRegisterInfo();
- const TargetRegisterClass *orc = mri.getRegClass(reg);
- SmallPtrSet<const TargetRegisterClass*,8> rcs;
-
- for (MachineRegisterInfo::reg_nodbg_iterator I = mri.reg_nodbg_begin(reg),
- E = mri.reg_nodbg_end(); I != E; ++I) {
- // The targets don't have accurate enough regclass descriptions that we can
- // handle subregs. We need something similar to
- // TRI::getMatchingSuperRegClass, but returning a super class instead of a
- // sub class.
- if (I.getOperand().getSubReg()) {
- DEBUG(dbgs() << "Cannot handle subregs: " << I.getOperand() << '\n');
- return;
- }
- if (const TargetRegisterClass *rc =
- I->getDesc().getRegClass(I.getOperandNo(), tri))
- rcs.insert(rc);
- }
-
- // If we found no regclass constraints, just leave reg as is.
- // In theory, we could inflate to the largest superclass of reg's existing
- // class, but that might not be legal for the current cpu setting.
- // This could happen if reg is only used by COPY instructions, so we may need
- // to improve on this.
- if (rcs.empty()) {
- DEBUG(dbgs() << "Not inflating unconstrained" << orc->getName() << ":%reg"
- << reg << ".\n");
- return;
- }
-
- // Compute the intersection of all classes in rcs.
- // This ought to be independent of iteration order, but if the target register
- // classes don't form a proper algebra, it is possible to get different
- // results. The solution is to make sure the intersection of any two register
- // classes is also a register class or the null set.
- const TargetRegisterClass *rc = 0;
- for (SmallPtrSet<const TargetRegisterClass*,8>::iterator I = rcs.begin(),
- E = rcs.end(); I != E; ++I) {
- rc = rc ? getCommonSubClass(rc, *I) : *I;
- assert(rc && "Incompatible regclass constraints found");
- }