diff options
Diffstat (limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp')
| -rw-r--r-- | lib/CodeGen/LiveIntervalAnalysis.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index f2bf917201..c47c839748 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -746,7 +746,7 @@ 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, +bool LiveIntervals::shrinkToUses(LiveInterval *li, SmallVectorImpl<MachineInstr*> *dead) { DEBUG(dbgs() << "Shrink: " << *li << '\n'); assert(TargetRegisterInfo::isVirtualRegister(li->reg) @@ -835,6 +835,7 @@ void LiveIntervals::shrinkToUses(LiveInterval *li, } // Handle dead values. + bool CanSeparate = false; for (LiveInterval::vni_iterator I = li->vni_begin(), E = li->vni_end(); I != E; ++I) { VNInfo *VNI = *I; @@ -848,6 +849,8 @@ void LiveIntervals::shrinkToUses(LiveInterval *li, // This is a dead PHI. Remove it. VNI->setIsUnused(true); NewLI.removeRange(*LII); + DEBUG(dbgs() << "Dead PHI at " << VNI->def << " may separate interval\n"); + CanSeparate = true; } else { // This is a dead def. Make sure the instruction knows. MachineInstr *MI = getInstructionFromIndex(VNI->def); @@ -863,6 +866,7 @@ void LiveIntervals::shrinkToUses(LiveInterval *li, // Move the trimmed ranges back. li->ranges.swap(NewLI.ranges); DEBUG(dbgs() << "Shrunk: " << *li << '\n'); + return CanSeparate; } |