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- Add LiveVariables::replaceKillInstruction. This does a subset of instructionChanged. That is, it only update the VarInfo.kills if the new instruction is known to have the correct dead and kill markers. 

- CommuteInstruction copies kill / dead markers over to new instruction. So use replaceKillInstruction instead.

llvm-svn: 53061
This commit is contained in:
Evan Cheng 2008-07-03 00:07:19 +00:00
parent c939f45fe7
commit 7a265d83bf
3 changed files with 16 additions and 3 deletions
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5
llvm/include/llvm/CodeGen/LiveVariables.h
View File

@ -189,6 +189,11 @@ public:
/// the records for NewMI.
void instructionChanged(MachineInstr *OldMI, MachineInstr *NewMI);
/// replaceKillInstruction - Update register kill info by replacing a kill
/// instruction with a new one.
void replaceKillInstruction(unsigned Reg, MachineInstr *OldMI,
MachineInstr *NewMI);
/// addVirtualRegisterKilled - Add information about the fact that the
/// specified register is killed after being used by the specified
/// instruction. If AddIfNotFound is true, add a implicit operand if it's

9
llvm/lib/CodeGen/LiveVariables.cpp
View File

@ -684,6 +684,15 @@ void LiveVariables::instructionChanged(MachineInstr *OldMI,
}
}
/// replaceKillInstruction - Update register kill info by replacing a kill
/// instruction with a new one.
void LiveVariables::replaceKillInstruction(unsigned Reg, MachineInstr *OldMI,
MachineInstr *NewMI) {
VarInfo &VI = getVarInfo(Reg);
if (VI.removeKill(OldMI))
VI.Kills.push_back(NewMI); // Yes, there was a kill of it
}
/// removeVirtualRegistersKilled - Remove all killed info for the specified
/// instruction.
void LiveVariables::removeVirtualRegistersKilled(MachineInstr *MI) {

5
llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
View File

@ -375,10 +375,9 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
DOUT << "2addr: COMMUTED TO: " << *NewMI;
// If the instruction changed to commute it, update livevar.
if (NewMI != mi) {
if (LV) {
if (LV)
// Update live variables
LV->instructionChanged(mi, NewMI);
}
LV->replaceKillInstruction(regC, mi, NewMI);
mbbi->insert(mi, NewMI); // Insert the new inst
mbbi->erase(mi); // Nuke the old inst.