-//===- SPURegisterInfo.cpp - Cell SPU Register Information ----------------===//
+//===-- SPURegisterInfo.cpp - Cell SPU Register Information ---------------===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "reginfo"
-#include "SPU.h"
#include "SPURegisterInfo.h"
-#include "SPURegisterNames.h"
+#include "SPU.h"
#include "SPUInstrBuilder.h"
#include "SPUSubtarget.h"
#include "SPUMachineFunction.h"
-#include "SPUFrameInfo.h"
+#include "SPUFrameLowering.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/CodeGen/ValueTypes.h"
-#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include <cstdlib>
+#define GET_REGINFO_TARGET_DESC
+#include "SPUGenRegisterInfo.inc"
+
using namespace llvm;
/// getRegisterNumbering - Given the enum value for some register, e.g.
case SPU::R126: return 126;
case SPU::R127: return 127;
default:
- cerr << "Unhandled reg in SPURegisterInfo::getRegisterNumbering!\n";
- abort();
+ report_fatal_error("Unhandled reg in SPURegisterInfo::getRegisterNumbering");
}
}
SPURegisterInfo::SPURegisterInfo(const SPUSubtarget &subtarget,
const TargetInstrInfo &tii) :
- SPUGenRegisterInfo(SPU::ADJCALLSTACKDOWN, SPU::ADJCALLSTACKUP),
- Subtarget(subtarget),
- TII(tii)
+ SPUGenRegisterInfo(SPU::R0), Subtarget(subtarget), TII(tii)
{
}
-// SPU's 128-bit registers used for argument passing:
-static const unsigned SPU_ArgRegs[] = {
- SPU::R3, SPU::R4, SPU::R5, SPU::R6, SPU::R7, SPU::R8, SPU::R9,
- SPU::R10, SPU::R11, SPU::R12, SPU::R13, SPU::R14, SPU::R15, SPU::R16,
- SPU::R17, SPU::R18, SPU::R19, SPU::R20, SPU::R21, SPU::R22, SPU::R23,
- SPU::R24, SPU::R25, SPU::R26, SPU::R27, SPU::R28, SPU::R29, SPU::R30,
- SPU::R31, SPU::R32, SPU::R33, SPU::R34, SPU::R35, SPU::R36, SPU::R37,
- SPU::R38, SPU::R39, SPU::R40, SPU::R41, SPU::R42, SPU::R43, SPU::R44,
- SPU::R45, SPU::R46, SPU::R47, SPU::R48, SPU::R49, SPU::R50, SPU::R51,
- SPU::R52, SPU::R53, SPU::R54, SPU::R55, SPU::R56, SPU::R57, SPU::R58,
- SPU::R59, SPU::R60, SPU::R61, SPU::R62, SPU::R63, SPU::R64, SPU::R65,
- SPU::R66, SPU::R67, SPU::R68, SPU::R69, SPU::R70, SPU::R71, SPU::R72,
- SPU::R73, SPU::R74, SPU::R75, SPU::R76, SPU::R77, SPU::R78, SPU::R79
-};
-
-const unsigned *
-SPURegisterInfo::getArgRegs()
-{
- return SPU_ArgRegs;
-}
-
-unsigned
-SPURegisterInfo::getNumArgRegs()
-{
- return sizeof(SPU_ArgRegs) / sizeof(SPU_ArgRegs[0]);
-}
-
/// getPointerRegClass - Return the register class to use to hold pointers.
/// This is used for addressing modes.
-const TargetRegisterClass * SPURegisterInfo::getPointerRegClass() const
-{
+const TargetRegisterClass *
+SPURegisterInfo::getPointerRegClass(unsigned Kind) const {
return &SPU::R32CRegClass;
}
-const unsigned *
+const uint16_t *
SPURegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const
{
// Cell ABI calling convention
- static const unsigned SPU_CalleeSaveRegs[] = {
+ static const uint16_t SPU_CalleeSaveRegs[] = {
SPU::R80, SPU::R81, SPU::R82, SPU::R83,
SPU::R84, SPU::R85, SPU::R86, SPU::R87,
SPU::R88, SPU::R89, SPU::R90, SPU::R91,
return SPU_CalleeSaveRegs;
}
-const TargetRegisterClass* const*
-SPURegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const
-{
- // Cell ABI Calling Convention
- static const TargetRegisterClass * const SPU_CalleeSaveRegClasses[] = {
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
- &SPU::GPRCRegClass, /* environment pointer */
- &SPU::GPRCRegClass, /* stack pointer */
- &SPU::GPRCRegClass, /* link register */
- 0 /* end */
- };
-
- return SPU_CalleeSaveRegClasses;
-}
-
/*!
R0 (link register), R1 (stack pointer) and R2 (environment pointer -- this is
generally unused) are the Cell's reserved registers
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
-// needsFP - Return true if the specified function should have a dedicated frame
-// pointer register. This is true if the function has variable sized allocas or
-// if frame pointer elimination is disabled.
-//
-static bool needsFP(const MachineFunction &MF) {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- return NoFramePointerElim || MFI->hasVarSizedObjects();
-}
-
-//--------------------------------------------------------------------------
-// hasFP - Return true if the specified function actually has a dedicated frame
-// pointer register. This is true if the function needs a frame pointer and has
-// a non-zero stack size.
-bool
-SPURegisterInfo::hasFP(const MachineFunction &MF) const {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- return MFI->getStackSize() && needsFP(MF);
-}
-
//--------------------------------------------------------------------------
void
SPURegisterInfo::eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB = *MI.getParent();
MachineFunction &MF = *MBB.getParent();
MachineFrameInfo *MFI = MF.getFrameInfo();
+ DebugLoc dl = II->getDebugLoc();
while (!MI.getOperand(i).isFI()) {
++i;
MachineOperand &MO = MI.getOperand(OpNo);
// Offset is biased by $lr's slot at the bottom.
- Offset += MO.getImm() + MFI->getStackSize() + SPUFrameInfo::minStackSize();
+ Offset += MO.getImm() + MFI->getStackSize() + SPUFrameLowering::minStackSize();
assert((Offset & 0xf) == 0
&& "16-byte alignment violated in eliminateFrameIndex");
// Replace the FrameIndex with base register with $sp (aka $r1)
SPOp.ChangeToRegister(SPU::R1, false);
- if (Offset > SPUFrameInfo::maxFrameOffset()
- || Offset < SPUFrameInfo::minFrameOffset()) {
- cerr << "Large stack adjustment ("
- << Offset
- << ") in SPURegisterInfo::eliminateFrameIndex.";
- } else {
- MO.ChangeToImmediate(Offset);
- }
-}
-
-/// determineFrameLayout - Determine the size of the frame and maximum call
-/// frame size.
-void
-SPURegisterInfo::determineFrameLayout(MachineFunction &MF) const
-{
- MachineFrameInfo *MFI = MF.getFrameInfo();
-
- // Get the number of bytes to allocate from the FrameInfo
- unsigned FrameSize = MFI->getStackSize();
-
- // Get the alignments provided by the target, and the maximum alignment
- // (if any) of the fixed frame objects.
- unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
- unsigned Align = std::max(TargetAlign, MFI->getMaxAlignment());
- assert(isPowerOf2_32(Align) && "Alignment is not power of 2");
- unsigned AlignMask = Align - 1;
-
- // Get the maximum call frame size of all the calls.
- unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
-
- // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
- // that allocations will be aligned.
- if (MFI->hasVarSizedObjects())
- maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
-
- // Update maximum call frame size.
- MFI->setMaxCallFrameSize(maxCallFrameSize);
-
- // Include call frame size in total.
- FrameSize += maxCallFrameSize;
-
- // Make sure the frame is aligned.
- FrameSize = (FrameSize + AlignMask) & ~AlignMask;
-
- // Update frame info.
- MFI->setStackSize(FrameSize);
-}
-
-void SPURegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *RS)
- const {
- // Mark LR and SP unused, since the prolog spills them to stack and
- // we don't want anyone else to spill them for us.
- //
- // Also, unless R2 is really used someday, don't spill it automatically.
- MF.getRegInfo().setPhysRegUnused(SPU::R0);
- MF.getRegInfo().setPhysRegUnused(SPU::R1);
- MF.getRegInfo().setPhysRegUnused(SPU::R2);
-}
-
-void SPURegisterInfo::emitPrologue(MachineFunction &MF) const
-{
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
- MachineBasicBlock::iterator MBBI = MBB.begin();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
-
- // Prepare for debug frame info.
- bool hasDebugInfo = MMI && MMI->hasDebugInfo();
- unsigned FrameLabelId = 0;
-
- // Move MBBI back to the beginning of the function.
- MBBI = MBB.begin();
-
- // Work out frame sizes.
- determineFrameLayout(MF);
- int FrameSize = MFI->getStackSize();
-
- assert((FrameSize & 0xf) == 0
- && "SPURegisterInfo::emitPrologue: FrameSize not aligned");
-
- if (FrameSize > 0 || MFI->hasCalls()) {
- FrameSize = -(FrameSize + SPUFrameInfo::minStackSize());
- if (hasDebugInfo) {
- // Mark effective beginning of when frame pointer becomes valid.
- FrameLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, TII.get(SPU::DBG_LABEL)).addImm(FrameLabelId);
- }
- // Adjust stack pointer, spilling $lr -> 16($sp) and $sp -> -FrameSize($sp)
- // for the ABI
- BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R0).addImm(16)
- .addReg(SPU::R1);
- if (isS10Constant(FrameSize)) {
- // Spill $sp to adjusted $sp
- BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R1).addImm(FrameSize)
+ // if 'Offset' doesn't fit to the D-form instruction's
+ // immediate, convert the instruction to X-form
+ // if the instruction is not an AI (which takes a s10 immediate), assume
+ // it is a load/store that can take a s14 immediate
+ if ((MI.getOpcode() == SPU::AIr32 && !isInt<10>(Offset))
+ || !isInt<14>(Offset)) {
+ int newOpcode = convertDFormToXForm(MI.getOpcode());
+ unsigned tmpReg = findScratchRegister(II, RS, &SPU::R32CRegClass, SPAdj);
+ BuildMI(MBB, II, dl, TII.get(SPU::ILr32), tmpReg )
+ .addImm(Offset);
+ BuildMI(MBB, II, dl, TII.get(newOpcode), MI.getOperand(0).getReg())
+ .addReg(tmpReg, RegState::Kill)
.addReg(SPU::R1);
- // Adjust $sp by required amout
- BuildMI(MBB, MBBI, TII.get(SPU::AIr32), SPU::R1).addReg(SPU::R1)
- .addImm(FrameSize);
- } else if (FrameSize <= (1 << 16) - 1 && FrameSize >= -(1 << 16)) {
- // Frame size can be loaded into ILr32n, so temporarily spill $r2 and use
- // $r2 to adjust $sp:
- BuildMI(MBB, MBBI, TII.get(SPU::STQDr128), SPU::R2)
- .addImm(-16)
- .addReg(SPU::R1);
- BuildMI(MBB, MBBI, TII.get(SPU::ILr32), SPU::R2)
- .addImm(FrameSize);
- BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R1)
- .addReg(SPU::R2)
- .addReg(SPU::R1);
- BuildMI(MBB, MBBI, TII.get(SPU::Ar32), SPU::R1)
- .addReg(SPU::R1)
- .addReg(SPU::R2);
- BuildMI(MBB, MBBI, TII.get(SPU::SFIr32), SPU::R2)
- .addReg(SPU::R2)
- .addImm(16);
- BuildMI(MBB, MBBI, TII.get(SPU::LQXr128), SPU::R2)
- .addReg(SPU::R2)
- .addReg(SPU::R1);
- } else {
- cerr << "Unhandled frame size: " << FrameSize << "\n";
- abort();
- }
-
- if (hasDebugInfo) {
- std::vector<MachineMove> &Moves = MMI->getFrameMoves();
-
- // Show update of SP.
- MachineLocation SPDst(MachineLocation::VirtualFP);
- MachineLocation SPSrc(MachineLocation::VirtualFP, -FrameSize);
- Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
-
- // Add callee saved registers to move list.
- const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
- for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
- int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
- unsigned Reg = CSI[I].getReg();
- if (Reg == SPU::R0) continue;
- MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
- MachineLocation CSSrc(Reg);
- Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
- }
-
- // Mark effective beginning of when frame pointer is ready.
- unsigned ReadyLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, TII.get(SPU::DBG_LABEL)).addImm(ReadyLabelId);
-
- MachineLocation FPDst(SPU::R1);
- MachineLocation FPSrc(MachineLocation::VirtualFP);
- Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
- }
+ // remove the replaced D-form instruction
+ MBB.erase(II);
} else {
- // This is a leaf function -- insert a branch hint iff there are
- // sufficient number instructions in the basic block. Note that
- // this is just a best guess based on the basic block's size.
- if (MBB.size() >= (unsigned) SPUFrameInfo::branchHintPenalty()) {
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- // Insert terminator label
- unsigned BranchLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, TII.get(SPU::DBG_LABEL)).addImm(BranchLabelId);
- }
+ MO.ChangeToImmediate(Offset);
}
}
-void
-SPURegisterInfo::emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
-{
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- int FrameSize = MFI->getStackSize();
- int LinkSlotOffset = SPUFrameInfo::stackSlotSize();
-
- assert(MBBI->getOpcode() == SPU::RET &&
- "Can only insert epilog into returning blocks");
- assert((FrameSize & 0xf) == 0
- && "SPURegisterInfo::emitEpilogue: FrameSize not aligned");
- if (FrameSize > 0 || MFI->hasCalls()) {
- FrameSize = FrameSize + SPUFrameInfo::minStackSize();
- if (isS10Constant(FrameSize + LinkSlotOffset)) {
- // Reload $lr, adjust $sp by required amount
- // Note: We do this to slightly improve dual issue -- not by much, but it
- // is an opportunity for dual issue.
- BuildMI(MBB, MBBI, TII.get(SPU::LQDr128), SPU::R0)
- .addImm(FrameSize + LinkSlotOffset)
- .addReg(SPU::R1);
- BuildMI(MBB, MBBI, TII.get(SPU::AIr32), SPU::R1)
- .addReg(SPU::R1)
- .addImm(FrameSize);
- } else if (FrameSize <= (1 << 16) - 1 && FrameSize >= -(1 << 16)) {
- // Frame size can be loaded into ILr32n, so temporarily spill $r2 and use
- // $r2 to adjust $sp:
- BuildMI(MBB, MBBI, TII.get(SPU::STQDr128), SPU::R2)
- .addImm(16)
- .addReg(SPU::R1);
- BuildMI(MBB, MBBI, TII.get(SPU::ILr32), SPU::R2)
- .addImm(FrameSize);
- BuildMI(MBB, MBBI, TII.get(SPU::Ar32), SPU::R1)
- .addReg(SPU::R1)
- .addReg(SPU::R2);
- BuildMI(MBB, MBBI, TII.get(SPU::LQDr128), SPU::R0)
- .addImm(16)
- .addReg(SPU::R2);
- BuildMI(MBB, MBBI, TII.get(SPU::SFIr32), SPU::R2).
- addReg(SPU::R2)
- .addImm(16);
- BuildMI(MBB, MBBI, TII.get(SPU::LQXr128), SPU::R2)
- .addReg(SPU::R2)
- .addReg(SPU::R1);
- } else {
- cerr << "Unhandled frame size: " << FrameSize << "\n";
- abort();
- }
- }
-}
-
-unsigned
-SPURegisterInfo::getRARegister() const
-{
- return SPU::R0;
-}
-
unsigned
-SPURegisterInfo::getFrameRegister(MachineFunction &MF) const
+SPURegisterInfo::getFrameRegister(const MachineFunction &MF) const
{
return SPU::R1;
}
-void
-SPURegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const
+int
+SPURegisterInfo::convertDFormToXForm(int dFormOpcode) const
{
- // Initial state of the frame pointer is R1.
- MachineLocation Dst(MachineLocation::VirtualFP);
- MachineLocation Src(SPU::R1, 0);
- Moves.push_back(MachineMove(0, Dst, Src));
+ switch(dFormOpcode)
+ {
+ case SPU::AIr32: return SPU::Ar32;
+ case SPU::LQDr32: return SPU::LQXr32;
+ case SPU::LQDr128: return SPU::LQXr128;
+ case SPU::LQDv16i8: return SPU::LQXv16i8;
+ case SPU::LQDv4i32: return SPU::LQXv4i32;
+ case SPU::LQDv4f32: return SPU::LQXv4f32;
+ case SPU::STQDr32: return SPU::STQXr32;
+ case SPU::STQDr128: return SPU::STQXr128;
+ case SPU::STQDv16i8: return SPU::STQXv16i8;
+ case SPU::STQDv4i32: return SPU::STQXv4i32;
+ case SPU::STQDv4f32: return SPU::STQXv4f32;
+
+ default: assert( false && "Unhandled D to X-form conversion");
+ }
+ // default will assert, but need to return something to keep the
+ // compiler happy.
+ return dFormOpcode;
}
-
-int
-SPURegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
- // FIXME: Most probably dwarf numbers differs for Linux and Darwin
- return SPUGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
+// TODO this is already copied from PPC. Could this convenience function
+// be moved to the RegScavenger class?
+unsigned
+SPURegisterInfo::findScratchRegister(MachineBasicBlock::iterator II,
+ RegScavenger *RS,
+ const TargetRegisterClass *RC,
+ int SPAdj) const
+{
+ assert(RS && "Register scavenging must be on");
+ unsigned Reg = RS->FindUnusedReg(RC);
+ if (Reg == 0)
+ Reg = RS->scavengeRegister(RC, II, SPAdj);
+ assert( Reg && "Register scavenger failed");
+ return Reg;
}
-
-#include "SPUGenRegisterInfo.inc"
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