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Fix for PR4124. Make TwoAddressFormPass::FindLastUseInMBB return the real last use.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2009-05-14 04:26:30 +00:00
parent f957012866
commit a7c9deaa2b
1 changed files with 5 additions and 2 deletions
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7
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -316,7 +316,7 @@ bool TwoAddressInstructionPass::NoUseAfterLastDef(unsigned Reg,
MachineInstr *TwoAddressInstructionPass::FindLastUseInMBB(unsigned Reg, MachineInstr *TwoAddressInstructionPass::FindLastUseInMBB(unsigned Reg,
MachineBasicBlock *MBB, MachineBasicBlock *MBB,
unsigned Dist) { unsigned Dist) {
unsigned LastUseDist = Dist; unsigned LastUseDist = 0;
MachineInstr *LastUse = 0; MachineInstr *LastUse = 0;
for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(Reg), for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(Reg),
E = MRI->reg_end(); I != E; ++I) { E = MRI->reg_end(); I != E; ++I) {
@ -327,7 +327,10 @@ MachineInstr *TwoAddressInstructionPass::FindLastUseInMBB(unsigned Reg,
DenseMap<MachineInstr*, unsigned>::iterator DI = DistanceMap.find(MI); DenseMap<MachineInstr*, unsigned>::iterator DI = DistanceMap.find(MI);
if (DI == DistanceMap.end()) if (DI == DistanceMap.end())
continue; continue;
if (MO.isUse() && DI->second < LastUseDist) { if (DI->second >= Dist)
continue;
if (MO.isUse() && DI->second > LastUseDist) {
LastUse = DI->first; LastUse = DI->first;
LastUseDist = DI->second; LastUseDist = DI->second;
} }