}
if (!DefMI && !VNI->isPHIDef())
DefMI = LIS.getInstructionFromIndex(VNI->def);
- if (DefMI)
- Edit->checkRematerializable(VNI, DefMI, TII, AA);
+ if (DefMI && Edit->checkRematerializable(VNI, DefMI, TII, AA)) {
+ DEBUG(dbgs() << "Value " << PrintReg(Reg) << ':' << VNI->id << '@'
+ << VNI->def << " may remat from " << *DefMI);
+ }
}
}
}
return LI;
}
-void LiveRangeEdit::checkRematerializable(VNInfo *VNI,
+bool LiveRangeEdit::checkRematerializable(VNInfo *VNI,
const MachineInstr *DefMI,
const TargetInstrInfo &tii,
AliasAnalysis *aa) {
assert(DefMI && "Missing instruction");
- if (tii.isTriviallyReMaterializable(DefMI, aa))
- remattable_.insert(VNI);
scannedRemattable_ = true;
+ if (!tii.isTriviallyReMaterializable(DefMI, aa))
+ return false;
+ remattable_.insert(VNI);
+ return true;
}
void LiveRangeEdit::scanRemattable(LiveIntervals &lis,
/// checkRematerializable - Manually add VNI to the list of rematerializable
/// values if DefMI may be rematerializable.
- void checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
+ bool checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
const TargetInstrInfo&, AliasAnalysis*);
/// Remat - Information needed to rematerialize at a specific location.