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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 // Extend the live range of the MI that last kill the register if
// necessary. // necessary.
bool WasKill = false;
if (SSMI) { if (SSMI) {
MachineOperand *MOK = SSMI->findRegisterUseOperand(PhysReg, true); MachineOperand *MOK = SSMI->findRegisterUseOperand(PhysReg, true);
if (MOK) if (MOK) {
WasKill = MOK->isKill();
MOK->unsetIsKill(); MOK->unsetIsKill();
}
} }
if (ti == -1) { if (ti == -1) {
// Unless it's the use of a two-address code, transfer the kill // Unless it's the use of a two-address code, transfer the kill
// of the reused register to this use. // of the reused register to this use.
MI.getOperand(i).setIsKill(); if (WasKill)
MI.getOperand(i).setIsKill();
Spills.addLastUse(PhysReg, &MI); 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 // Extend the live range of the MI that last kill the register if
// necessary. // necessary.
bool WasKill = false;
if (SSMI) { if (SSMI) {
MachineOperand *MOK = SSMI->findRegisterUseOperand(PhysReg, true); MachineOperand *MOK = SSMI->findRegisterUseOperand(PhysReg, true);
if (MOK) if (MOK) {
WasKill = MOK->isKill();
MOK->unsetIsKill(); MOK->unsetIsKill();
}
} }
MachineInstr *CopyMI = prior(MII); MachineInstr *CopyMI = prior(MII);
MachineOperand *MOU = CopyMI->findRegisterUseOperand(PhysReg); if (WasKill) {
MOU->setIsKill(); // Transfer kill to the next use.
Spills.addLastUse(PhysReg, &MI); MachineOperand *MOU = CopyMI->findRegisterUseOperand(PhysReg);
MOU->setIsKill();
}
Spills.addLastUse(PhysReg, CopyMI);
// This invalidates DesignatedReg. // This invalidates DesignatedReg.
Spills.ClobberPhysReg(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 // Either way, the live range of the last kill of InReg has been
// extended. Remove its kill. // extended. Remove its kill.
bool WasKill = false;
if (SSMI) { if (SSMI) {
MachineOperand *MOK = SSMI->findRegisterUseOperand(InReg, true); MachineOperand *MOK = SSMI->findRegisterUseOperand(InReg, true);
if (MOK) if (MOK) {
WasKill = MOK->isKill();
MOK->unsetIsKill(); MOK->unsetIsKill();
}
} }
if (NextMII != MBB.end()) { if (NextMII != MBB.end()) {
// If NextMII uses InReg (must be the copy?), mark it killed. // If NextMII uses InReg (must be the copy?), mark it killed.
MachineOperand *MOU = NextMII->findRegisterUseOperand(InReg); MachineOperand *MOU = NextMII->findRegisterUseOperand(InReg);
if (MOU) { if (MOU) {
MOU->setIsKill(); if (WasKill)
MOU->setIsKill();
Spills.addLastUse(InReg, &(*NextMII)); Spills.addLastUse(InReg, &(*NextMII));
} }
} }