#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/Compiler.h"
/// frame indexes with appropriate references.
///
bool runOnMachineFunction(MachineFunction &Fn) {
- const MRegisterInfo *MRI = Fn.getTarget().getRegisterInfo();
- RS = MRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
+ const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
+ RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
// Get MachineModuleInfo so that we can track the construction of the
// frame.
// Allow the target machine to make some adjustments to the function
// e.g. UsedPhysRegs before calculateCalleeSavedRegisters.
- MRI->processFunctionBeforeCalleeSavedScan(Fn, RS);
+ 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
// Allow the target machine to make final modifications to the function
// before the frame layout is finalized.
- Fn.getTarget().getRegisterInfo()->processFunctionBeforeFrameFinalized(Fn);
+ TRI->processFunctionBeforeFrameFinalized(Fn);
// Calculate actual frame offsets for all of the abstract stack objects...
calculateFrameObjectOffsets(Fn);
/// instructions.
///
void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
- const MRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
+ const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
const TargetFrameInfo *TFI = Fn.getTarget().getFrameInfo();
// Get the callee saved register list...
MachineBasicBlock *MBB = Fn.begin();
MachineBasicBlock::iterator I = MBB->begin();
- // Do not insert prologue code before debug LABELs at the start of the
- // entry block.
- MachineModuleInfo *MMI = FFI->getMachineModuleInfo();
- if (MMI && MMI->hasDebugInfo())
- while (I != MBB->end() && I->getOpcode() == TargetInstrInfo::LABEL)
- ++I;
-
if (!TII.spillCalleeSavedRegisters(*MBB, I, CSI)) {
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
// Add the callee-saved register as live-in. It's killed at the spill.
// Loop over all of the stack objects, assigning sequential addresses...
MachineFrameInfo *FFI = Fn.getFrameInfo();
- unsigned MaxAlign = 0;
+ unsigned MaxAlign = FFI->getMaxAlignment();
// Start at the beginning of the local area.
// The Offset is the distance from the stack top in the direction
FFI->setObjectOffset(i, -Offset); // Set the computed offset
}
} else {
- for (unsigned i = MaxCSFrameIndex; i >= MinCSFrameIndex; --i) {
+ int MaxCSFI = MaxCSFrameIndex, MinCSFI = MinCSFrameIndex;
+ for (int i = MaxCSFI; i >= MinCSFI ; --i) {
unsigned Align = FFI->getObjectAlignment(i);
// If the alignment of this object is greater than that of the stack, then
// increase the stack alignment to match.
// Make sure the special register scavenging spill slot is closest to the
// frame pointer if a frame pointer is required.
- const MRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
+ const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
if (RS && RegInfo->hasFP(Fn)) {
int SFI = RS->getScavengingFrameIndex();
if (SFI >= 0) {
continue;
if (RS && (int)i == RS->getScavengingFrameIndex())
continue;
+ if (FFI->isDeadObjectIndex(i))
+ continue;
// If stack grows down, we need to add size of find the lowest
// address of the object.
Offset += FFI->getObjectSize(SFI);
unsigned Align = FFI->getObjectAlignment(SFI);
+ // If the alignment of this object is greater than that of the
+ // stack, then increase the stack alignment to match.
+ MaxAlign = std::max(MaxAlign, Align);
// Adjust to alignment boundary
Offset = (Offset+Align-1)/Align*Align;
// Remember the required stack alignment in case targets need it to perform
// dynamic stack alignment.
- assert(FFI->getMaxAlignment() == MaxAlign &&
- "Stack alignment calculation broken!");
+ FFI->setMaxAlignment(MaxAlign);
}
/// prolog and epilog code to the function.
///
void PEI::insertPrologEpilogCode(MachineFunction &Fn) {
+ const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
+
// Add prologue to the function...
- Fn.getTarget().getRegisterInfo()->emitPrologue(Fn);
+ TRI->emitPrologue(Fn);
// Add epilogue to restore the callee-save registers in each exiting block
for (MachineFunction::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
// If last instruction is a return instruction, add an epilogue
if (!I->empty() && I->back().getDesc().isReturn())
- Fn.getTarget().getRegisterInfo()->emitEpilogue(Fn, *I);
+ TRI->emitEpilogue(Fn, *I);
}
}
const TargetMachine &TM = Fn.getTarget();
assert(TM.getRegisterInfo() && "TM::getRegisterInfo() must be implemented!");
- const MRegisterInfo &MRI = *TM.getRegisterInfo();
+ const TargetRegisterInfo &TRI = *TM.getRegisterInfo();
const TargetFrameInfo *TFI = TM.getFrameInfo();
bool StackGrowsDown =
TFI->getStackGrowthDirection() == TargetFrameInfo::StackGrowsDown;
- int FrameSetupOpcode = MRI.getCallFrameSetupOpcode();
- int FrameDestroyOpcode = MRI.getCallFrameDestroyOpcode();
+ int FrameSetupOpcode = TRI.getCallFrameSetupOpcode();
+ int FrameDestroyOpcode = TRI.getCallFrameDestroyOpcode();
for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
int SPAdj = 0; // SP offset due to call frame setup / destroy.
for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ) {
MachineInstr *MI = I;
- // Remember how much SP has been adjustment to create the call frame.
+ if (I->getOpcode() == TargetInstrInfo::DECLARE) {
+ // Ignore it.
+ ++I;
+ continue;
+ }
+
if (I->getOpcode() == FrameSetupOpcode ||
I->getOpcode() == FrameDestroyOpcode) {
+ // Remember how much SP has been adjusted to create the call
+ // frame.
int Size = I->getOperand(0).getImm();
+
if ((!StackGrowsDown && I->getOpcode() == FrameSetupOpcode) ||
(StackGrowsDown && I->getOpcode() == FrameDestroyOpcode))
Size = -Size;
+
SPAdj += Size;
+
MachineBasicBlock::iterator PrevI = prior(I);
- MRI.eliminateCallFramePseudoInstr(Fn, *BB, I);
+ TRI.eliminateCallFramePseudoInstr(Fn, *BB, I);
+
// Visit the instructions created by eliminateCallFramePseudoInstr().
I = next(PrevI);
- MI = NULL;
- } else {
- I++;
- for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
- if (MI->getOperand(i).isFrameIndex()) {
- // If this instruction has a FrameIndex operand, we need to use that
- // target machine register info object to eliminate it.
- MRI.eliminateFrameIndex(MI, SPAdj, RS);
-
- // Revisit the instruction in full. Some instructions (e.g. inline
- // asm instructions) can have multiple frame indices.
- --I;
- MI = 0;
- break;
- }
+ continue;
}
+
+ bool DoIncr = true;
+
+ for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
+ if (MI->getOperand(i).isFrameIndex()) {
+ // Some instructions (e.g. inline asm instructions) can have
+ // multiple frame indices and/or cause eliminateFrameIndex
+ // to insert more than one instruction. We need the register
+ // scavenger to go through all of these instructions so that
+ // it can update its register information. We keep the
+ // iterator at the point before insertion so that we can
+ // revisit them in full.
+ bool AtBeginning = (I == BB->begin());
+ if (!AtBeginning) --I;
+
+ // If this instruction has a FrameIndex operand, we need to
+ // use that target machine register info object to eliminate
+ // it.
+ TRI.eliminateFrameIndex(MI, SPAdj, RS);
+
+ // Reset the iterator if we were at the beginning of the BB.
+ if (AtBeginning) {
+ I = BB->begin();
+ DoIncr = false;
+ }
+
+ MI = 0;
+ break;
+ }
+
+ if (DoIncr) ++I;
+
// Update register states.
if (RS && MI) RS->forward(MI);
}
+
assert(SPAdj == 0 && "Unbalanced call frame setup / destroy pairs?");
}
}
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