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Now that we have getCalleeSaveRegClasses() info, use it to pass the register

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class into the spill/reload methods.  Targets can now rely on that argument.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23556 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-30 16:59:07 +00:00
parent 2f9dbe8ee6
commit 80a4f169b4
1 changed files with 11 additions and 8 deletions
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19
lib/CodeGen/PrologEpilogInserter.cpp
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@ -70,7 +70,7 @@ namespace {
}
private:
std::vector<unsigned> RegsToSave;
std::vector<std::pair<unsigned, const TargetRegisterClass*> > RegsToSave;
std::vector<int> StackSlots;
void calculateCallerSavedRegisters(MachineFunction &Fn);
@ -136,15 +136,18 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
// function, thus needing to be saved and restored in the prolog/epilog.
//
const bool *PhysRegsUsed = Fn.getUsedPhysregs();
const TargetRegisterClass* const *CSRegClasses =
RegInfo->getCalleeSaveRegClasses();
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
if (PhysRegsUsed[Reg]) {
RegsToSave.push_back(Reg); // If the reg is modified, save it!
// If the reg is modified, save it!
RegsToSave.push_back(std::make_pair(Reg, CSRegClasses[i]));
} else {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) { // Check alias registers too.
if (PhysRegsUsed[*AliasSet]) {
RegsToSave.push_back(Reg);
RegsToSave.push_back(std::make_pair(Reg, CSRegClasses[i]));
break;
}
}
@ -161,7 +164,7 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
// Now that we know which registers need to be saved and restored, allocate
// stack slots for them.
for (unsigned i = 0, e = RegsToSave.size(); i != e; ++i) {
unsigned Reg = RegsToSave[i];
unsigned Reg = RegsToSave[i].first;
// Check to see if this physreg must be spilled to a particular stack slot
// on this target.
@ -200,8 +203,8 @@ void PEI::saveCallerSavedRegisters(MachineFunction &Fn) {
MachineBasicBlock::iterator I = MBB->begin();
for (unsigned i = 0, e = RegsToSave.size(); i != e; ++i) {
// Insert the spill to the stack frame.
RegInfo->storeRegToStackSlot(*MBB, I, RegsToSave[i], StackSlots[i],
0 /*FIXME*/);
RegInfo->storeRegToStackSlot(*MBB, I, RegsToSave[i].first, StackSlots[i],
RegsToSave[i].second);
}
// Add code to restore the callee-save registers in each exiting block.
@ -226,8 +229,8 @@ void PEI::saveCallerSavedRegisters(MachineFunction &Fn) {
// Restore all registers immediately before the return and any terminators
// that preceed it.
for (unsigned i = 0, e = RegsToSave.size(); i != e; ++i) {
RegInfo->loadRegFromStackSlot(*MBB, I, RegsToSave[i], StackSlots[i],
0 /*FIXME*/);
RegInfo->loadRegFromStackSlot(*MBB, I, RegsToSave[i].first,
StackSlots[i], RegsToSave[i].second);
assert(I != MBB->begin() &&
"loadRegFromStackSlot didn't insert any code!");
// Insert in reverse order. loadRegFromStackSlot can insert multiple