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- Fixing naming inconsistency: calleesave -> calleesaved. 

- Make use of spillCalleeSavedRegisters() and restoreCalleeSavedRegisters().

llvm-svn: 32822
This commit is contained in:
Evan Cheng 2007-01-02 21:31:15 +00:00
parent 07140c22c7
commit 92484c2aa4
1 changed files with 30 additions and 24 deletions
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54
llvm/lib/CodeGen/PrologEpilogInserter.cpp
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@ -46,7 +46,8 @@ namespace {
// Allow the target machine to make some adjustments to the function
// e.g. UsedPhysRegs before calculateCalleeSavedRegisters.
Fn.getTarget().getRegisterInfo()->processFunctionBeforeCalleeSaveScan(Fn);
Fn.getTarget().getRegisterInfo()
->processFunctionBeforeCalleeSavedScan(Fn);
// Scan the function for modified callee saved registers and insert spill
// code for any callee saved registers that are modified. Also calculate
@ -80,7 +81,7 @@ namespace {
}
private:
// MinCSFrameIndex, MaxCSFrameIndex - Keeps the range of callee save
// MinCSFrameIndex, MaxCSFrameIndex - Keeps the range of callee saved
// stack frame indexes.
unsigned MinCSFrameIndex, MaxCSFrameIndex;
@ -109,7 +110,7 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
const TargetFrameInfo *TFI = Fn.getTarget().getFrameInfo();
// Get the callee saved register list...
const unsigned *CSRegs = RegInfo->getCalleeSaveRegs();
const unsigned *CSRegs = RegInfo->getCalleeSavedRegs();
// Get the function call frame set-up and tear-down instruction opcode
int FrameSetupOpcode = RegInfo->getCallFrameSetupOpcode();
@ -151,7 +152,7 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
//
const bool *PhysRegsUsed = Fn.getUsedPhysregs();
const TargetRegisterClass* const *CSRegClasses =
RegInfo->getCalleeSaveRegClasses();
RegInfo->getCalleeSavedRegClasses();
std::vector<CalleeSavedInfo> CSI;
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
@ -174,7 +175,7 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
unsigned NumFixedSpillSlots;
const std::pair<unsigned,int> *FixedSpillSlots =
TFI->getCalleeSaveSpillSlots(NumFixedSpillSlots);
TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots);
// Now that we know which registers need to be saved and restored, allocate
// stack slots for them.
@ -228,10 +229,13 @@ void PEI::saveCalleeSavedRegisters(MachineFunction &Fn) {
// code into the entry block.
MachineBasicBlock *MBB = Fn.begin();
MachineBasicBlock::iterator I = MBB->begin();
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
// Insert the spill to the stack frame.
RegInfo->storeRegToStackSlot(*MBB, I, CSI[i].getReg(), CSI[i].getFrameIdx(),
CSI[i].getRegClass());
if (!RegInfo->spillCalleeSavedRegisters(*MBB, I, CSI)) {
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
// Insert the spill to the stack frame.
RegInfo->storeRegToStackSlot(*MBB, I, CSI[i].getReg(),
CSI[i].getFrameIdx(),
CSI[i].getRegClass());
}
}
// Add code to restore the callee-save registers in each exiting block.
@ -255,19 +259,21 @@ void PEI::saveCalleeSavedRegisters(MachineFunction &Fn) {
// Restore all registers immediately before the return and any terminators
// that preceed it.
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
RegInfo->loadRegFromStackSlot(*MBB, I, CSI[i].getReg(),
CSI[i].getFrameIdx(),
CSI[i].getRegClass());
assert(I != MBB->begin() &&
"loadRegFromStackSlot didn't insert any code!");
// Insert in reverse order. loadRegFromStackSlot can insert multiple
// instructions.
if (AtStart)
I = MBB->begin();
else {
I = BeforeI;
++I;
if (!RegInfo->restoreCalleeSavedRegisters(*MBB, I, CSI)) {
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
RegInfo->loadRegFromStackSlot(*MBB, I, CSI[i].getReg(),
CSI[i].getFrameIdx(),
CSI[i].getRegClass());
assert(I != MBB->begin() &&
"loadRegFromStackSlot didn't insert any code!");
// Insert in reverse order. loadRegFromStackSlot can insert multiple
// instructions.
if (AtStart)
I = MBB->begin();
else {
I = BeforeI;
++I;
}
}
}
}
@ -319,7 +325,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
}
// First assign frame offsets to stack objects that are used to spill
// callee save registers.
// callee saved registers.
if (StackGrowsDown) {
for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
if (i < MinCSFrameIndex || i > MaxCSFrameIndex)
@ -356,7 +362,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
}
// Then assign frame offsets to stack objects that are not used to spill
// callee save registers.
// callee saved registers.
for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
if (i >= MinCSFrameIndex && i <= MaxCSFrameIndex)
continue;