Changes in directory llvm/lib/CodeGen:
LiveIntervalAnalysis.cpp updated: 1.211 -> 1.212 --- Log message: Remove unnecessary isKill properties if a live range has been lengthened due to coalescing. --- Diffs of the changes: (+24 -1) LiveIntervalAnalysis.cpp | 25 ++++++++++++++++++++++++- 1 files changed, 24 insertions(+), 1 deletion(-) Index: llvm/lib/CodeGen/LiveIntervalAnalysis.cpp diff -u llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1.211 llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1.212 --- llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1.211 Wed Feb 21 16:41:17 2007 +++ llvm/lib/CodeGen/LiveIntervalAnalysis.cpp Thu Feb 22 17:03:39 2007 @@ -959,10 +959,22 @@ DOUT << "\n\t\tJoined. Result = "; DestInt.print(DOUT, mri_); DOUT << "\n"; - + // If the intervals were swapped by Join, swap them back so that the register // mapping (in the r2i map) is correct. if (Swapped) SrcInt.swap(DestInt); + + // Live range has been lengthened due to colaescing, eliminate the + // unnecessary kills at the end of the source live ranges. + LiveVariables::VarInfo& vi = lv_->getVarInfo(repSrcReg); + for (unsigned i = 0, e = vi.Kills.size(); i != e; ++i) { + MachineInstr *Kill = vi.Kills[i]; + if (Kill == CopyMI || isRemoved(Kill)) + continue; + if (DestInt.liveAt(getInstructionIndex(Kill) + InstrSlots::NUM)) + unsetRegisterKill(Kill, repSrcReg); + } + removeInterval(repSrcReg); r2rMap_[repSrcReg] = repDstReg; @@ -1471,6 +1483,17 @@ return false; } +/// unsetRegisterKill - Unset IsKill property of all uses of specific register +/// of the specific instruction. +void LiveIntervals::unsetRegisterKill(MachineInstr *MI, unsigned Reg) { + for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { + MachineOperand &MO = MI->getOperand(i); + if (MO.isReg() && MO.isUse() && MO.isKill() && MO.getReg() && + mri_->regsOverlap(rep(MO.getReg()), Reg)) + MO.unsetIsKill(); + } +} + LiveInterval LiveIntervals::createInterval(unsigned reg) { float Weight = MRegisterInfo::isPhysicalRegister(reg) ? HUGE_VALF : 0.0F; _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits