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Consolidate callee saved register information so that it can me used by debug

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information and exception handling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29881 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey
2006-08-25 19:45:51 +00:00
parent 4c2c9031ac
commit f3e4f0e615
2 changed files with 53 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
lib/CodeGen/PrologEpilogInserter.cpp
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@@ -71,15 +71,10 @@ namespace {
//
replaceFrameIndices(Fn);
RegsToSave.clear();
StackSlots.clear();
return true;
}
private:
std::vector<std::pair<unsigned, const TargetRegisterClass*> > RegsToSave;
std::vector<int> StackSlots;
void calculateCallerSavedRegisters(MachineFunction &Fn);
void saveCallerSavedRegisters(MachineFunction &Fn);
void calculateFrameObjectOffsets(MachineFunction &Fn);
@@ -144,23 +139,24 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
const bool *PhysRegsUsed = Fn.getUsedPhysregs();
const TargetRegisterClass* const *CSRegClasses =
RegInfo->getCalleeSaveRegClasses();
std::vector<CalleeSavedInfo> &CSI = FFI->getCalleeSavedInfo();
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
if (PhysRegsUsed[Reg]) {
// If the reg is modified, save it!
RegsToSave.push_back(std::make_pair(Reg, CSRegClasses[i]));
CSI.push_back(CalleeSavedInfo(Reg, CSRegClasses[i]));
} else {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) { // Check alias registers too.
if (PhysRegsUsed[*AliasSet]) {
RegsToSave.push_back(std::make_pair(Reg, CSRegClasses[i]));
CSI.push_back(CalleeSavedInfo(Reg, CSRegClasses[i]));
break;
}
}
}
}
if (RegsToSave.empty())
if (CSI.empty())
return; // Early exit if no caller saved registers are modified!
unsigned NumFixedSpillSlots;
@@ -169,9 +165,9 @@ 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].first;
const TargetRegisterClass *RC = RegsToSave[i].second;
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
const TargetRegisterClass *RC = CSI[i].getRegClass();
// Check to see if this physreg must be spilled to a particular stack slot
// on this target.
@@ -188,7 +184,7 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
// Spill it to the stack where we must.
FrameIdx = FFI->CreateFixedObject(RC->getSize(), FixedSlot->second);
}
StackSlots.push_back(FrameIdx);
CSI[i].setFrameIdx(FrameIdx);
}
}
@@ -196,8 +192,12 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
/// that are modified in the function.
///
void PEI::saveCallerSavedRegisters(MachineFunction &Fn) {
// Get callee saved register information.
MachineFrameInfo *FFI = Fn.getFrameInfo();
std::vector<CalleeSavedInfo> &CSI = FFI->getCalleeSavedInfo();
// Early exit if no caller saved registers are modified!
if (RegsToSave.empty())
if (CSI.empty())
return;
const MRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
@@ -206,10 +206,10 @@ void PEI::saveCallerSavedRegisters(MachineFunction &Fn) {
// code into the entry block.
MachineBasicBlock *MBB = Fn.begin();
MachineBasicBlock::iterator I = MBB->begin();
for (unsigned i = 0, e = RegsToSave.size(); i != e; ++i) {
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
// Insert the spill to the stack frame.
RegInfo->storeRegToStackSlot(*MBB, I, RegsToSave[i].first, StackSlots[i],
RegsToSave[i].second);
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.
@@ -233,9 +233,10 @@ 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].first,
StackSlots[i], RegsToSave[i].second);
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