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Allow a target to choose whether to prefer the scavenger emergency spill slot
be next to the frame pointer or the stack pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126956 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -631,6 +631,13 @@ public:
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return false;
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}
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/// useFPForScavengingIndex - returns true if the target wants to use
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/// frame pointer based accesses to spill to the scavenger emergency spill
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/// slot.
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virtual bool useFPForScavengingIndex(const MachineFunction &MF) const {
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return true;
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}
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/// requiresFrameIndexScavenging - returns true if the target requires post
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/// PEI scavenging of registers for materializing frame index constants.
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virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const {
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@ -559,7 +559,8 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
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// Make sure the special register scavenging spill slot is closest to the
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// frame pointer if a frame pointer is required.
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const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
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if (RS && TFI.hasFP(Fn) && !RegInfo->needsStackRealignment(Fn)) {
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if (RS && TFI.hasFP(Fn) && RegInfo->useFPForScavengingIndex(Fn) &&
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!RegInfo->needsStackRealignment(Fn)) {
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int SFI = RS->getScavengingFrameIndex();
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if (SFI >= 0)
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AdjustStackOffset(MFI, SFI, StackGrowsDown, Offset, MaxAlign);
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@ -641,7 +642,8 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
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// Make sure the special register scavenging spill slot is closest to the
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// stack pointer.
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if (RS && (!TFI.hasFP(Fn) || RegInfo->needsStackRealignment(Fn))) {
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if (RS && (!TFI.hasFP(Fn) || RegInfo->needsStackRealignment(Fn) ||
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!RegInfo->useFPForScavengingIndex(Fn))) {
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int SFI = RS->getScavengingFrameIndex();
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if (SFI >= 0)
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AdjustStackOffset(MFI, SFI, StackGrowsDown, Offset, MaxAlign);
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@ -811,7 +813,6 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
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// directly.
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for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ) {
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MachineInstr *MI = I;
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bool DoIncr = true;
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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if (MI->getOperand(i).isReg()) {
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MachineOperand &MO = MI->getOperand(i);
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@ -842,10 +843,8 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
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}
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}
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if (DoIncr) {
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RS->forward(I);
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++I;
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}
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RS->forward(I);
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++I;
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}
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}
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}
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