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Scan for presence of calls and determine max callframe size early. To allow ProcessFunctionBeforeCalleeSaveScan() use this information

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llvm-svn: 75942
This commit is contained in:
Anton Korobeynikov 2009-07-16 13:50:40 +00:00
parent 4fcadd1a7d
commit 64ff9c023a
2 changed files with 37 additions and 25 deletions
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61
lib/CodeGen/PrologEpilogInserter.cpp
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@ -59,14 +59,16 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
if (MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>())
Fn.getFrameInfo()->setMachineModuleInfo(MMI);
// Calculate the MaxCallFrameSize and HasCalls variables for the function's
// frame information. Also eliminates call frame pseudo instructions.
calculateCallsInformation(Fn);
// Allow the target machine to make some adjustments to the function
// e.g. UsedPhysRegs before calculateCalleeSavedRegisters.
TRI->processFunctionBeforeCalleeSavedScan(Fn, RS);
// Scan the function for modified callee saved registers and insert spill
// code for any callee saved registers that are modified. Also calculate
// the MaxCallFrameSize and HasCalls variables for the function's frame
// information and eliminates call frame pseudo instructions.
// Scan the function for modified callee saved registers and insert spill code
// for any callee saved registers that are modified.
calculateCalleeSavedRegisters(Fn);
// Determine placement of CSR spill/restore code:
@ -117,35 +119,24 @@ void PEI::getAnalysisUsage(AnalysisUsage &AU) const {
}
#endif
/// calculateCalleeSavedRegisters - Scan the function for modified callee saved
/// registers. Also calculate the MaxCallFrameSize and HasCalls variables for
/// the function's frame information and eliminates call frame pseudo
/// instructions.
///
void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
/// calculateCallsInformation - Calculate the MaxCallFrameSize and HasCalls
/// variables for the function's frame information and eliminate call frame
/// pseudo instructions.
void PEI::calculateCallsInformation(MachineFunction &Fn) {
const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
const TargetFrameInfo *TFI = Fn.getTarget().getFrameInfo();
// Get the callee saved register list...
const unsigned *CSRegs = RegInfo->getCalleeSavedRegs(&Fn);
unsigned MaxCallFrameSize = 0;
bool HasCalls = false;
// Get the function call frame set-up and tear-down instruction opcode
int FrameSetupOpcode = RegInfo->getCallFrameSetupOpcode();
int FrameDestroyOpcode = RegInfo->getCallFrameDestroyOpcode();
// These are used to keep track the callee-save area. Initialize them.
MinCSFrameIndex = INT_MAX;
MaxCSFrameIndex = 0;
// Early exit for targets which have no callee saved registers and no call
// frame setup/destroy pseudo instructions.
if ((CSRegs == 0 || CSRegs[0] == 0) &&
FrameSetupOpcode == -1 && FrameDestroyOpcode == -1)
// Early exit for targets which have no call frame setup/destroy pseudo
// instructions.
if (FrameSetupOpcode == -1 && FrameDestroyOpcode == -1)
return;
unsigned MaxCallFrameSize = 0;
bool HasCalls = false;
std::vector<MachineBasicBlock::iterator> FrameSDOps;
for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB)
for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ++I)
@ -173,8 +164,28 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
if (RegInfo->hasReservedCallFrame(Fn) || RegInfo->hasFP(Fn))
RegInfo->eliminateCallFramePseudoInstr(Fn, *I->getParent(), I);
}
}
// Now figure out which *callee saved* registers are modified by the current
/// calculateCalleeSavedRegisters - Scan the function for modified callee saved
/// registers.
void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
const TargetFrameInfo *TFI = Fn.getTarget().getFrameInfo();
MachineFrameInfo *FFI = Fn.getFrameInfo();
// Get the callee saved register list...
const unsigned *CSRegs = RegInfo->getCalleeSavedRegs(&Fn);
// These are used to keep track the callee-save area. Initialize them.
MinCSFrameIndex = INT_MAX;
MaxCSFrameIndex = 0;
// Early exit for targets which have no callee saved registers.
if (CSRegs == 0 || CSRegs[0] == 0)
return;
// Figure out which *callee saved* registers are modified by the current
// function, thus needing to be saved and restored in the prolog/epilog.
const TargetRegisterClass * const *CSRegClasses =
RegInfo->getCalleeSavedRegClasses(&Fn);

1
lib/CodeGen/PrologEpilogInserter.h
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@ -118,6 +118,7 @@ namespace llvm {
CSRegBlockMap &prevRestores);
void placeSpillsAndRestores(MachineFunction &Fn);
void placeCSRSpillsAndRestores(MachineFunction &Fn);
void calculateCallsInformation(MachineFunction &Fn);
void calculateCalleeSavedRegisters(MachineFunction &Fn);
void insertCSRSpillsAndRestores(MachineFunction &Fn);
void calculateFrameObjectOffsets(MachineFunction &Fn);