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If the 2addr instruction has other kills, don't move it below any other uses since we don't want to extend other live ranges.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144772 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-11-16 03:47:42 +00:00
parent 2bee6a8bb7
commit 9bad88a9de
1 changed files with 7 additions and 2 deletions
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9
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -933,6 +933,7 @@ TwoAddressInstructionPass::RescheduleMIBelowKill(MachineBasicBlock *MBB,
return false;
SmallSet<unsigned, 2> Uses;
SmallSet<unsigned, 2> Kills;
SmallSet<unsigned, 2> Defs;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
@ -943,8 +944,11 @@ TwoAddressInstructionPass::RescheduleMIBelowKill(MachineBasicBlock *MBB,
continue;
if (MO.isDef())
Defs.insert(MOReg);
else
else {
Uses.insert(MOReg);
if (MO.isKill() && MOReg != Reg)
Kills.insert(MOReg);
}
}
// Move the copies connected to MI down as well.
@ -991,7 +995,8 @@ TwoAddressInstructionPass::RescheduleMIBelowKill(MachineBasicBlock *MBB,
} else {
if (Defs.count(MOReg))
return false;
if (MOReg != Reg && MO.isKill() && Uses.count(MOReg))
if (MOReg != Reg &&
((MO.isKill() && Uses.count(MOReg)) || Kills.count(MOReg)))
// Don't want to extend other live ranges and update kills.
return false;
}