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Clear kill flags while computing live ranges.

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Kill flags are difficult to maintain, and liveness queries are better
handled by live intervals.

Kill flags are reinserted after register allocation by addKillFlags().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163334 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-09-06 18:15:15 +00:00
parent 5177b3a8c4
commit f9dff0e0e4
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/LiveRangeCalc.cpp
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@ -65,7 +65,11 @@ void LiveRangeCalc::extendToUses(LiveInterval *LI, unsigned Reg) {
// Visit all operands that read Reg. This may include partial defs.
for (MachineRegisterInfo::reg_nodbg_iterator I = MRI->reg_nodbg_begin(Reg),
E = MRI->reg_nodbg_end(); I != E; ++I) {
const MachineOperand &MO = I.getOperand();
MachineOperand &MO = I.getOperand();
// Clear all kill flags. They will be reinserted after register allocation
// by LiveIntervalAnalysis::addKillFlags().
if (MO.isUse())
MO.setIsKill(false);
if (!MO.readsReg())
continue;
// MI is reading Reg. We may have visited MI before if it happens to be