//===----------------------------------------------------------------------===//
#include "SystemZ.h"
+#include "SystemZInstrInfo.h"
#include "SystemZMachineFunctionInfo.h"
#include "SystemZRegisterInfo.h"
#include "SystemZSubtarget.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
SystemZRegisterInfo::SystemZRegisterInfo(SystemZTargetMachine &tm,
- const TargetInstrInfo &tii)
+ const SystemZInstrInfo &tii)
: SystemZGenRegisterInfo(SystemZ::ADJCALLSTACKUP, SystemZ::ADJCALLSTACKDOWN),
TM(tm), TII(tii) {
}
SystemZRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
static const unsigned CalleeSavedRegs[] = {
SystemZ::R6D, SystemZ::R7D, SystemZ::R8D, SystemZ::R9D,
- SystemZ::R10D, SystemZ::R11D, SystemZ::R12D, SystemZ::R13D, SystemZ::R14D,
- SystemZ::F1, SystemZ::F3, SystemZ::F5, SystemZ::F7,
+ SystemZ::R10D, SystemZ::R11D, SystemZ::R12D, SystemZ::R13D,
+ SystemZ::R14D, SystemZ::R15D,
+ SystemZ::F8L, SystemZ::F9L, SystemZ::F10L, SystemZ::F11L,
+ SystemZ::F12L, SystemZ::F13L, SystemZ::F14L, SystemZ::F15L,
0
};
return CalleeSavedRegs;
}
-const TargetRegisterClass* const*
-SystemZRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
- static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass, 0
- };
- return CalleeSavedRegClasses;
-}
-
BitVector SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
if (hasFP(MF))
return Reserved;
}
-// 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.
-//
+/// 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.
bool SystemZRegisterInfo::hasFP(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
- return NoFramePointerElim || MFI->hasVarSizedObjects();
-}
-
-bool SystemZRegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
- return !MF.getFrameInfo()->hasVarSizedObjects();
+ return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects();
}
void SystemZRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
- if (!hasReservedCallFrame(MF)) {
- assert(0 && "Not implemented yet!");
- }
-
MBB.erase(I);
}
-int SystemZRegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
+int SystemZRegisterInfo::getFrameIndexOffset(const MachineFunction &MF,
+ int FI) const {
const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- SystemZMachineFunctionInfo *SystemZMFI =
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const SystemZMachineFunctionInfo *SystemZMFI =
MF.getInfo<SystemZMachineFunctionInfo>();
int Offset = MFI->getObjectOffset(FI) + MFI->getOffsetAdjustment();
uint64_t StackSize = MFI->getStackSize();
Offset += StackSize - TFI.getOffsetOfLocalArea();
// Skip the register save area if we generated the stack frame.
- if (StackSize)
+ if (StackSize || MFI->hasCalls())
Offset -= TFI.getOffsetOfLocalArea();
return Offset;
}
-void SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const {
+unsigned
+SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, FrameIndexValue *Value,
+ RegScavenger *RS) const {
assert(SPAdj == 0 && "Unxpected");
unsigned i = 0;
// displacement field.
MI.getOperand(i).ChangeToRegister(BasePtr, false);
- // Offset is a 20-bit integer.
+ // Offset is a either 12-bit unsigned or 20-bit signed integer.
// FIXME: handle "too long" displacements.
int Offset = getFrameIndexOffset(MF, FrameIndex) + MI.getOperand(i+1).getImm();
+
+ // Check whether displacement is too long to fit into 12 bit zext field.
+ MI.setDesc(TII.getMemoryInstr(MI.getOpcode(), Offset));
+
MI.getOperand(i+1).ChangeToImmediate(Offset);
+ return 0;
+}
+
+void
+SystemZRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
+ RegScavenger *RS) const {
+ // Determine whether R15/R14 will ever be clobbered inside the function. And
+ // if yes - mark it as 'callee' saved.
+ MachineFrameInfo *FFI = MF.getFrameInfo();
+ MachineRegisterInfo &MRI = MF.getRegInfo();
+
+ // Check whether high FPRs are ever used, if yes - we need to save R15 as
+ // well.
+ static const unsigned HighFPRs[] = {
+ SystemZ::F8L, SystemZ::F9L, SystemZ::F10L, SystemZ::F11L,
+ SystemZ::F12L, SystemZ::F13L, SystemZ::F14L, SystemZ::F15L,
+ SystemZ::F8S, SystemZ::F9S, SystemZ::F10S, SystemZ::F11S,
+ SystemZ::F12S, SystemZ::F13S, SystemZ::F14S, SystemZ::F15S,
+ };
+
+ bool HighFPRsUsed = false;
+ for (unsigned i = 0, e = array_lengthof(HighFPRs); i != e; ++i)
+ HighFPRsUsed |= MRI.isPhysRegUsed(HighFPRs[i]);
+
+ if (FFI->hasCalls())
+ /* FIXME: function is varargs */
+ /* FIXME: function grabs RA */
+ /* FIXME: function calls eh_return */
+ MRI.setPhysRegUsed(SystemZ::R14D);
+
+ if (HighFPRsUsed ||
+ FFI->hasCalls() ||
+ FFI->getObjectIndexEnd() != 0 || // Contains automatic variables
+ FFI->hasVarSizedObjects() // Function calls dynamic alloca's
+ /* FIXME: function is varargs */)
+ MRI.setPhysRegUsed(SystemZ::R15D);
}
/// emitSPUpdate - Emit a series of instructions to increment / decrement the
static
void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
int64_t NumBytes, const TargetInstrInfo &TII) {
- // FIXME: Handle different stack sizes here.
+ unsigned Opc; uint64_t Chunk;
bool isSub = NumBytes < 0;
uint64_t Offset = isSub ? -NumBytes : NumBytes;
- unsigned Opc = SystemZ::ADD64ri16;
- uint64_t Chunk = (1LL << 15) - 1;
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
+
+ if (Offset >= (1LL << 15) - 1) {
+ Opc = SystemZ::ADD64ri32;
+ Chunk = (1LL << 31) - 1;
+ } else {
+ Opc = SystemZ::ADD64ri16;
+ Chunk = (1LL << 15) - 1;
+ }
+
+ DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
while (Offset) {
uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset;
MachineInstr *MI =
BuildMI(MBB, MBBI, DL, TII.get(Opc), SystemZ::R15D)
- .addReg(SystemZ::R15D).addImm((isSub ? -(int64_t)ThisVal : ThisVal));
+ .addReg(SystemZ::R15D).addImm(isSub ? -ThisVal : ThisVal);
// The PSW implicit def is dead.
MI->getOperand(3).setIsDead();
Offset -= ThisVal;
SystemZMachineFunctionInfo *SystemZMFI =
MF.getInfo<SystemZMachineFunctionInfo>();
MachineBasicBlock::iterator MBBI = MBB.begin();
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
+ DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
// Get the number of bytes to allocate from the FrameInfo.
// Note that area for callee-saved stuff is already allocated, thus we need to
// 'undo' the stack movement.
- uint64_t StackSize =
- MFI->getStackSize() - SystemZMFI->getCalleeSavedFrameSize();
+ uint64_t StackSize = MFI->getStackSize();
+ StackSize -= SystemZMFI->getCalleeSavedFrameSize();
+
+ uint64_t NumBytes = StackSize - TFI.getOffsetOfLocalArea();
- // FIXME: Skip the callee-saved push instructions.
+ // Skip the callee-saved push instructions.
+ while (MBBI != MBB.end() &&
+ (MBBI->getOpcode() == SystemZ::MOV64mr ||
+ MBBI->getOpcode() == SystemZ::MOV64mrm))
+ ++MBBI;
if (MBBI != MBB.end())
DL = MBBI->getDebugLoc();
- uint64_t NumBytes = StackSize - TFI.getOffsetOfLocalArea();
-
- if (StackSize) // adjust stack pointer: R15 -= numbytes
+ // adjust stack pointer: R15 -= numbytes
+ if (StackSize || MFI->hasCalls()) {
+ assert(MF.getRegInfo().isPhysRegUsed(SystemZ::R15D) &&
+ "Invalid stack frame calculation!");
emitSPUpdate(MBB, MBBI, -(int64_t)NumBytes, TII);
+ }
if (hasFP(MF)) {
// Update R11 with the new base value...
.addReg(SystemZ::R15D);
// Mark the FramePtr as live-in in every block except the entry.
- for (MachineFunction::iterator I = next(MF.begin()), E = MF.end();
+ for (MachineFunction::iterator I = llvm::next(MF.begin()), E = MF.end();
I != E; ++I)
I->addLiveIn(SystemZ::R11D);
SystemZMachineFunctionInfo *SystemZMFI =
MF.getInfo<SystemZMachineFunctionInfo>();
unsigned RetOpcode = MBBI->getOpcode();
- DebugLoc DL = MBBI->getDebugLoc();
switch (RetOpcode) {
case SystemZ::RET: break; // These are ok
MFI->getStackSize() - SystemZMFI->getCalleeSavedFrameSize();
uint64_t NumBytes = StackSize - TFI.getOffsetOfLocalArea();
- // Skip the callee-saved regs load instructions.
- MachineBasicBlock::iterator LastCSPop = MBBI;
+ // Skip the final terminator instruction.
while (MBBI != MBB.begin()) {
MachineBasicBlock::iterator PI = prior(MBBI);
+ --MBBI;
if (!PI->getDesc().isTerminator())
break;
- --MBBI;
}
- DL = MBBI->getDebugLoc();
-
- if (MFI->hasVarSizedObjects()) {
- assert(0 && "Not implemented yet!");
- } else {
- // adjust stack pointer back: R15 += numbytes
- if (StackSize)
+ // During callee-saved restores emission stack frame was not yet finialized
+ // (and thus - the stack size was unknown). Tune the offset having full stack
+ // size in hands.
+ if (StackSize || MFI->hasCalls()) {
+ assert((MBBI->getOpcode() == SystemZ::MOV64rmm ||
+ MBBI->getOpcode() == SystemZ::MOV64rm) &&
+ "Expected to see callee-save register restore code");
+ assert(MF.getRegInfo().isPhysRegUsed(SystemZ::R15D) &&
+ "Invalid stack frame calculation!");
+
+ unsigned i = 0;
+ MachineInstr &MI = *MBBI;
+ while (!MI.getOperand(i).isImm()) {
+ ++i;
+ assert(i < MI.getNumOperands() && "Unexpected restore code!");
+ }
+
+ uint64_t Offset = NumBytes + MI.getOperand(i).getImm();
+ // If Offset does not fit into 20-bit signed displacement field we need to
+ // emit some additional code...
+ if (Offset > 524287) {
+ // Fold the displacement into load instruction as much as possible.
+ NumBytes = Offset - 524287;
+ Offset = 524287;
emitSPUpdate(MBB, MBBI, NumBytes, TII);
+ }
+
+ MI.getOperand(i).ChangeToImmediate(Offset);
}
}
return 0;
}
-unsigned SystemZRegisterInfo::getFrameRegister(MachineFunction &MF) const {
+unsigned
+SystemZRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
assert(0 && "What is the frame register");
return 0;
}
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