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Allow a target to choose whether to prefer the scavenger emergency spill slot

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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
This commit is contained in:
Jim Grosbach 2011-03-03 20:01:52 +00:00
parent 24b17c6730
commit 0f657b156f
2 changed files with 13 additions and 7 deletions
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7
include/llvm/Target/TargetRegisterInfo.h
View File

@ -631,6 +631,13 @@ public:
return false;
}
/// useFPForScavengingIndex - returns true if the target wants to use
/// frame pointer based accesses to spill to the scavenger emergency spill
/// slot.
virtual bool useFPForScavengingIndex(const MachineFunction &MF) const {
return true;
}
/// requiresFrameIndexScavenging - returns true if the target requires post
/// PEI scavenging of registers for materializing frame index constants.
virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const {

9
lib/CodeGen/PrologEpilogInserter.cpp
View File

@ -559,7 +559,8 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// Make sure the special register scavenging spill slot is closest to the
// frame pointer if a frame pointer is required.
const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
if (RS && TFI.hasFP(Fn) && !RegInfo->needsStackRealignment(Fn)) {
if (RS && TFI.hasFP(Fn) && RegInfo->useFPForScavengingIndex(Fn) &&
!RegInfo->needsStackRealignment(Fn)) {
int SFI = RS->getScavengingFrameIndex();
if (SFI >= 0)
AdjustStackOffset(MFI, SFI, StackGrowsDown, Offset, MaxAlign);
@ -641,7 +642,8 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// Make sure the special register scavenging spill slot is closest to the
// stack pointer.
if (RS && (!TFI.hasFP(Fn) || RegInfo->needsStackRealignment(Fn))) {
if (RS && (!TFI.hasFP(Fn) || RegInfo->needsStackRealignment(Fn) ||
!RegInfo->useFPForScavengingIndex(Fn))) {
int SFI = RS->getScavengingFrameIndex();
if (SFI >= 0)
AdjustStackOffset(MFI, SFI, StackGrowsDown, Offset, MaxAlign);
@ -811,7 +813,6 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
// directly.
for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ) {
MachineInstr *MI = I;
bool DoIncr = true;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
if (MI->getOperand(i).isReg()) {
MachineOperand &MO = MI->getOperand(i);
@ -842,10 +843,8 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
}
}
if (DoIncr) {
RS->forward(I);
++I;
}
}
}
}