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Only propagate IsKill if the last use is a kill.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34878 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-03-03 06:32:37 +00:00
parent e1aa066216
commit a7288df62d
1 changed files with 22 additions and 8 deletions
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30
lib/CodeGen/VirtRegMap.cpp
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@ -703,15 +703,19 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
// Extend the live range of the MI that last kill the register if
// necessary.
bool WasKill = false;
if (SSMI) {
MachineOperand *MOK = SSMI->findRegisterUseOperand(PhysReg, true);
if (MOK)
if (MOK) {
WasKill = MOK->isKill();
MOK->unsetIsKill();
}
}
if (ti == -1) {
// Unless it's the use of a two-address code, transfer the kill
// of the reused register to this use.
MI.getOperand(i).setIsKill();
if (WasKill)
MI.getOperand(i).setIsKill();
Spills.addLastUse(PhysReg, &MI);
}
@ -782,15 +786,21 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
// Extend the live range of the MI that last kill the register if
// necessary.
bool WasKill = false;
if (SSMI) {
MachineOperand *MOK = SSMI->findRegisterUseOperand(PhysReg, true);
if (MOK)
if (MOK) {
WasKill = MOK->isKill();
MOK->unsetIsKill();
}
}
MachineInstr *CopyMI = prior(MII);
MachineOperand *MOU = CopyMI->findRegisterUseOperand(PhysReg);
MOU->setIsKill();
Spills.addLastUse(PhysReg, &MI);
if (WasKill) {
// Transfer kill to the next use.
MachineOperand *MOU = CopyMI->findRegisterUseOperand(PhysReg);
MOU->setIsKill();
}
Spills.addLastUse(PhysReg, CopyMI);
// This invalidates DesignatedReg.
Spills.ClobberPhysReg(DesignatedReg);
@ -877,16 +887,20 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
// Either way, the live range of the last kill of InReg has been
// extended. Remove its kill.
bool WasKill = false;
if (SSMI) {
MachineOperand *MOK = SSMI->findRegisterUseOperand(InReg, true);
if (MOK)
if (MOK) {
WasKill = MOK->isKill();
MOK->unsetIsKill();
}
}
if (NextMII != MBB.end()) {
// If NextMII uses InReg (must be the copy?), mark it killed.
MachineOperand *MOU = NextMII->findRegisterUseOperand(InReg);
if (MOU) {
MOU->setIsKill();
if (WasKill)
MOU->setIsKill();
Spills.addLastUse(InReg, &(*NextMII));
}
}