diff options
| -rw-r--r-- | include/llvm/CodeGen/LiveIntervalAnalysis.h | 4 | ||||
| -rw-r--r-- | lib/CodeGen/LiveIntervalAnalysis.cpp | 7 |
2 files changed, 9 insertions, 2 deletions
diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h index b09f8d1110..1391f0f95b 100644 --- a/include/llvm/CodeGen/LiveIntervalAnalysis.h +++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h @@ -159,7 +159,9 @@ namespace llvm { /// range to just the remaining uses. This method does not compute reaching /// defs for new uses, and it doesn't remove dead defs. /// Dead PHIDef values are marked as unused. - void shrinkToUses(LiveInterval *li); + /// New dead machine instructions are added to the dead vector. + void shrinkToUses(LiveInterval *li, + SmallVectorImpl<MachineInstr*> *dead = 0); // Interval removal diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index 4dda548548..8a2db3e1a3 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -746,7 +746,8 @@ LiveInterval* LiveIntervals::dupInterval(LiveInterval *li) { /// shrinkToUses - After removing some uses of a register, shrink its live /// range to just the remaining uses. This method does not compute reaching /// defs for new uses, and it doesn't remove dead defs. -void LiveIntervals::shrinkToUses(LiveInterval *li) { +void LiveIntervals::shrinkToUses(LiveInterval *li, + SmallVectorImpl<MachineInstr*> *dead) { DEBUG(dbgs() << "Shrink: " << *li << '\n'); assert(TargetRegisterInfo::isVirtualRegister(li->reg) && "Can't only shrink physical registers"); @@ -852,6 +853,10 @@ void LiveIntervals::shrinkToUses(LiveInterval *li) { MachineInstr *MI = getInstructionFromIndex(VNI->def); assert(MI && "No instruction defining live value"); MI->addRegisterDead(li->reg, tri_); + if (dead && MI->allDefsAreDead()) { + DEBUG(dbgs() << "All defs dead: " << *MI); + dead->push_back(MI); + } } } |