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* Insert prolog/epilog code before rewriting indexes

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* Fix calculation of frame offsets when there is an offset.

llvm-svn: 5318
This commit is contained in:
Chris Lattner 2003-01-15 22:52:34 +00:00
parent 301e1307d2
commit 52c6c50212
1 changed files with 23 additions and 23 deletions
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46
lib/CodeGen/PrologEpilogInserter.cpp
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@ -41,13 +41,13 @@ namespace {
// Calculate actual frame offsets for all of the abstract stack objects...
calculateFrameObjectOffsets(Fn);
// Add prolog and epilog code to the function.
insertPrologEpilogCode(Fn);
// Replace all MO_FrameIndex operands with physical register references
// and actual offsets.
//
replaceFrameIndices(Fn);
// Add prolog and epilog code to the function.
insertPrologEpilogCode(Fn);
return true;
}
@ -187,7 +187,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
MachineFrameInfo *FFI = Fn.getFrameInfo();
// Start at the beginning of the local area...
int Offset = -TFI.getOffsetOfLocalArea();
int Offset = TFI.getOffsetOfLocalArea();
for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
Offset += FFI->getObjectSize(i); // Allocate Size bytes...
@ -202,7 +202,25 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
Offset = (Offset+StackAlign-1)/StackAlign*StackAlign;
// Set the final value of the stack pointer...
FFI->setStackSize(Offset);
FFI->setStackSize(Offset-TFI.getOffsetOfLocalArea());
}
/// insertPrologEpilogCode - Scan the function for modified caller saved
/// registers, insert spill code for these caller saved registers, then add
/// prolog and epilog code to the function.
///
void PEI::insertPrologEpilogCode(MachineFunction &Fn) {
// Add prologue to the function...
Fn.getTarget().getRegisterInfo()->emitPrologue(Fn);
// Add epilogue to restore the callee-save registers in each exiting block
const TargetInstrInfo &TII = Fn.getTarget().getInstrInfo();
for (MachineFunction::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
// If last instruction is a return instruction, add an epilogue
if (TII.isReturn(I->back()->getOpcode()))
Fn.getTarget().getRegisterInfo()->emitEpilogue(Fn, *I);
}
}
@ -226,21 +244,3 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
break;
}
}
/// insertPrologEpilogCode - Scan the function for modified caller saved
/// registers, insert spill code for these caller saved registers, then add
/// prolog and epilog code to the function.
///
void PEI::insertPrologEpilogCode(MachineFunction &Fn) {
// Add prologue to the function...
Fn.getTarget().getRegisterInfo()->emitPrologue(Fn);
// Add epilogue to restore the callee-save registers in each exiting block
const TargetInstrInfo &TII = Fn.getTarget().getInstrInfo();
for (MachineFunction::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
// If last instruction is a return instruction, add an epilogue
if (TII.isReturn(I->back()->getOpcode()))
Fn.getTarget().getRegisterInfo()->emitEpilogue(Fn, *I);
}
}