using namespace llvm;
char PEI::ID = 0;
+char &llvm::PrologEpilogCodeInserterID = PEI::ID;
INITIALIZE_PASS_BEGIN(PEI, "prologepilog",
"Prologue/Epilogue Insertion", false, false)
INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
+INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_END(PEI, "prologepilog",
- "Prologue/Epilogue Insertion", false, false)
+ "Prologue/Epilogue Insertion & Frame Finalization",
+ false, false)
STATISTIC(NumVirtualFrameRegs, "Number of virtual frame regs encountered");
STATISTIC(NumScavengedRegs, "Number of frame index regs scavenged");
STATISTIC(NumBytesStackSpace,
"Number of bytes used for stack in all functions");
-/// createPrologEpilogCodeInserter - This function returns a pass that inserts
-/// prolog and epilog code, and eliminates abstract frame references.
-///
-FunctionPass *llvm::createPrologEpilogCodeInserter() { return new PEI(); }
-
/// runOnMachineFunction - Insert prolog/epilog code and replace abstract
/// frame indexes with appropriate references.
///
const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
const TargetFrameLowering *TFI = Fn.getTarget().getFrameLowering();
+ assert(!Fn.getRegInfo().getNumVirtRegs() && "Regalloc must assign all vregs");
+
RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(Fn);
placeCSRSpillsAndRestores(Fn);
// Add the code to save and restore the callee saved registers
- if (!F->hasFnAttr(Attribute::Naked))
+ if (!F->getFnAttributes().hasAttribute(Attributes::Naked))
insertCSRSpillsAndRestores(Fn);
// Allow the target machine to make final modifications to the function
// called functions. Because of this, calculateCalleeSavedRegisters()
// must be called before this function in order to set the AdjustsStack
// and MaxCallFrameSize variables.
- if (!F->hasFnAttr(Attribute::Naked))
+ if (!F->getFnAttributes().hasAttribute(Attributes::Naked))
insertPrologEpilogCode(Fn);
// Replace all MO_FrameIndex operands with physical register references
if (TRI->requiresRegisterScavenging(Fn) && FrameIndexVirtualScavenging)
scavengeFrameVirtualRegs(Fn);
+ // Clear any vregs created by virtual scavenging.
+ Fn.getRegInfo().clearVirtRegs();
+
delete RS;
clearAllSets();
return true;
MachineFrameInfo *MFI = Fn.getFrameInfo();
// Get the callee saved register list...
- const unsigned *CSRegs = RegInfo->getCalleeSavedRegs(&Fn);
+ const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs(&Fn);
// These are used to keep track the callee-save area. Initialize them.
MinCSFrameIndex = INT_MAX;
return;
// In Naked functions we aren't going to save any registers.
- if (Fn.getFunction()->hasFnAttr(Attribute::Naked))
+ if (Fn.getFunction()->getFnAttributes().hasAttribute(Attributes::Naked))
return;
std::vector<CalleeSavedInfo> CSI;
const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
MachineBasicBlock::iterator I;
- if (! ShrinkWrapThisFunction) {
+ if (!ShrinkWrapThisFunction) {
// Spill using target interface.
I = EntryBlock->begin();
if (!TFI->spillCalleeSavedRegisters(*EntryBlock, I, CSI, TRI)) {
/// scavengeFrameVirtualRegs - Replace all frame index virtual registers
/// with physical registers. Use the register scavenger to find an
/// appropriate register to use.
+///
+/// FIXME: Iterating over the instruction stream is unnecessary. We can simply
+/// iterate over the vreg use list, which at this point only contains machine
+/// operands for which eliminateFrameIndex need a new scratch reg.
void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
// Run through the instructions and find any virtual registers.
for (MachineFunction::iterator BB = Fn.begin(),