-//===- SystemZRegisterInfo.cpp - SystemZ Register Information -------*- C++ -*-===//
+//===-- SystemZRegisterInfo.cpp - SystemZ register information ------------===//
//
// The LLVM Compiler Infrastructure
//
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
-//
-// This file contains the SystemZ implementation of the TargetRegisterInfo class.
-//
-//===----------------------------------------------------------------------===//
-#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"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/ADT/BitVector.h"
+#include "llvm/Target/TargetFrameLowering.h"
+
using namespace llvm;
-SystemZRegisterInfo::SystemZRegisterInfo(SystemZTargetMachine &tm,
- const SystemZInstrInfo &tii)
- : SystemZGenRegisterInfo(SystemZ::ADJCALLSTACKUP, SystemZ::ADJCALLSTACKDOWN),
- TM(tm), TII(tii) {
-}
+#define GET_REGINFO_TARGET_DESC
+#include "SystemZGenRegisterInfo.inc"
-const unsigned*
-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::R15D,
- SystemZ::F1L, SystemZ::F3L, SystemZ::F5L, SystemZ::F7L,
- 0
- };
+SystemZRegisterInfo::SystemZRegisterInfo()
+ : SystemZGenRegisterInfo(SystemZ::R14D) {}
- return CalleeSavedRegs;
+const MCPhysReg *
+SystemZRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
+ return CSR_SystemZ_SaveList;
}
-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::GR64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass, 0
- };
- return CalleeSavedRegClasses;
+const uint32_t *
+SystemZRegisterInfo::getCallPreservedMask(const MachineFunction &MF,
+ CallingConv::ID CC) const {
+ return CSR_SystemZ_RegMask;
}
-BitVector SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
+BitVector
+SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
- if (hasFP(MF))
- Reserved.set(SystemZ::R11D);
- Reserved.set(SystemZ::R14D);
- Reserved.set(SystemZ::R15D);
- 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.
-bool SystemZRegisterInfo::hasFP(const MachineFunction &MF) const {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- return NoFramePointerElim || MFI->hasVarSizedObjects();
-}
-
-void SystemZRegisterInfo::
-eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I) const {
- MBB.erase(I);
-}
-
-int SystemZRegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- SystemZMachineFunctionInfo *SystemZMFI =
- MF.getInfo<SystemZMachineFunctionInfo>();
- int Offset = MFI->getObjectOffset(FI) + MFI->getOffsetAdjustment();
- uint64_t StackSize = MFI->getStackSize();
+ const SystemZFrameLowering *TFI = getFrameLowering(MF);
- // Fixed objects are really located in the "previous" frame.
- if (FI < 0)
- StackSize -= SystemZMFI->getCalleeSavedFrameSize();
-
- Offset += StackSize - TFI.getOffsetOfLocalArea();
-
- // Skip the register save area if we generated the stack frame.
- if (StackSize)
- Offset -= TFI.getOffsetOfLocalArea();
-
- return Offset;
-}
-
-void SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const {
- assert(SPAdj == 0 && "Unxpected");
-
- unsigned i = 0;
- MachineInstr &MI = *II;
- MachineFunction &MF = *MI.getParent()->getParent();
- while (!MI.getOperand(i).isFI()) {
- ++i;
- assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
+ if (TFI->hasFP(MF)) {
+ // R11D is the frame pointer. Reserve all aliases.
+ Reserved.set(SystemZ::R11D);
+ Reserved.set(SystemZ::R11L);
+ Reserved.set(SystemZ::R11H);
+ Reserved.set(SystemZ::R10Q);
}
- int FrameIndex = MI.getOperand(i).getIndex();
-
- unsigned BasePtr = (hasFP(MF) ? SystemZ::R11D : SystemZ::R15D);
-
- // This must be part of a rri or ri operand memory reference. Replace the
- // FrameIndex with base register with BasePtr. Add an offset to the
- // displacement field.
- MI.getOperand(i).ChangeToRegister(BasePtr, false);
-
- // 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.
- if (Offset < 0 || Offset >= 4096)
- MI.setDesc(TII.getLongDispOpc(MI.getOpcode()));
-
- MI.getOperand(i+1).ChangeToImmediate(Offset);
+ // R15D is the stack pointer. Reserve all aliases.
+ Reserved.set(SystemZ::R15D);
+ Reserved.set(SystemZ::R15L);
+ Reserved.set(SystemZ::R15H);
+ Reserved.set(SystemZ::R14Q);
+ return Reserved;
}
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();
-
- if (FFI->hasCalls())
- /* FIXME: function is varargs */
- /* FIXME: function grabs RA */
- /* FIXME: function calls eh_return */
- MF.getRegInfo().setPhysRegUsed(SystemZ::R14D);
-
- if (FFI->hasCalls() ||
- FFI->getObjectIndexEnd() != 0 || // Contains automatic variables
- FFI->hasVarSizedObjects() // Function calls dynamic alloca's
- /* FIXME: function is varargs */)
- MF.getRegInfo().setPhysRegUsed(SystemZ::R15D);
-}
-
-/// emitSPUpdate - Emit a series of instructions to increment / decrement the
-/// stack pointer by a constant value.
-static
-void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
- int64_t NumBytes, const TargetInstrInfo &TII) {
- // FIXME: Handle different stack sizes here.
- 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());
-
- 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));
- // The PSW implicit def is dead.
- MI->getOperand(3).setIsDead();
- Offset -= ThisVal;
+SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator MI,
+ int SPAdj, unsigned FIOperandNum,
+ RegScavenger *RS) const {
+ assert(SPAdj == 0 && "Outgoing arguments should be part of the frame");
+
+ MachineBasicBlock &MBB = *MI->getParent();
+ MachineFunction &MF = *MBB.getParent();
+ auto *TII =
+ static_cast<const SystemZInstrInfo *>(MF.getSubtarget().getInstrInfo());
+ const SystemZFrameLowering *TFI = getFrameLowering(MF);
+ DebugLoc DL = MI->getDebugLoc();
+
+ // Decompose the frame index into a base and offset.
+ int FrameIndex = MI->getOperand(FIOperandNum).getIndex();
+ unsigned BasePtr;
+ int64_t Offset = (TFI->getFrameIndexReference(MF, FrameIndex, BasePtr) +
+ MI->getOperand(FIOperandNum + 1).getImm());
+
+ // Special handling of dbg_value instructions.
+ if (MI->isDebugValue()) {
+ MI->getOperand(FIOperandNum).ChangeToRegister(BasePtr, /*isDef*/ false);
+ MI->getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
+ return;
}
-}
-
-void SystemZRegisterInfo::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- SystemZMachineFunctionInfo *SystemZMFI =
- MF.getInfo<SystemZMachineFunctionInfo>();
- MachineBasicBlock::iterator MBBI = MBB.begin();
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
-
- // 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();
- StackSize -= SystemZMFI->getCalleeSavedFrameSize();
- uint64_t NumBytes = StackSize - TFI.getOffsetOfLocalArea();
-
- // 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();
-
- // 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...
- BuildMI(MBB, MBBI, DL, TII.get(SystemZ::MOV64rr), SystemZ::R11D)
- .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();
- I != E; ++I)
- I->addLiveIn(SystemZ::R11D);
-
- }
-}
-
-void SystemZRegisterInfo::emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- SystemZMachineFunctionInfo *SystemZMFI =
- MF.getInfo<SystemZMachineFunctionInfo>();
- unsigned RetOpcode = MBBI->getOpcode();
- DebugLoc DL = MBBI->getDebugLoc();
-
- switch (RetOpcode) {
- case SystemZ::RET: break; // These are ok
- default:
- assert(0 && "Can only insert epilog into returning blocks");
- }
-
- // 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 NumBytes = StackSize - TFI.getOffsetOfLocalArea();
-
- // Skip the final terminator instruction.
- while (MBBI != MBB.begin()) {
- MachineBasicBlock::iterator PI = prior(MBBI);
- --MBBI;
- if (!PI->getDesc().isTerminator())
- break;
- }
-
- // 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!");
+ // See if the offset is in range, or if an equivalent instruction that
+ // accepts the offset exists.
+ unsigned Opcode = MI->getOpcode();
+ unsigned OpcodeForOffset = TII->getOpcodeForOffset(Opcode, Offset);
+ if (OpcodeForOffset)
+ MI->getOperand(FIOperandNum).ChangeToRegister(BasePtr, false);
+ else {
+ // Create an anchor point that is in range. Start at 0xffff so that
+ // can use LLILH to load the immediate.
+ int64_t OldOffset = Offset;
+ int64_t Mask = 0xffff;
+ do {
+ Offset = OldOffset & Mask;
+ OpcodeForOffset = TII->getOpcodeForOffset(Opcode, Offset);
+ Mask >>= 1;
+ assert(Mask && "One offset must be OK");
+ } while (!OpcodeForOffset);
+
+ unsigned ScratchReg =
+ MF.getRegInfo().createVirtualRegister(&SystemZ::ADDR64BitRegClass);
+ int64_t HighOffset = OldOffset - Offset;
+
+ if (MI->getDesc().TSFlags & SystemZII::HasIndex
+ && MI->getOperand(FIOperandNum + 2).getReg() == 0) {
+ // Load the offset into the scratch register and use it as an index.
+ // The scratch register then dies here.
+ TII->loadImmediate(MBB, MI, ScratchReg, HighOffset);
+ MI->getOperand(FIOperandNum).ChangeToRegister(BasePtr, false);
+ MI->getOperand(FIOperandNum + 2).ChangeToRegister(ScratchReg,
+ false, false, true);
+ } else {
+ // Load the anchor address into a scratch register.
+ unsigned LAOpcode = TII->getOpcodeForOffset(SystemZ::LA, HighOffset);
+ if (LAOpcode)
+ BuildMI(MBB, MI, DL, TII->get(LAOpcode),ScratchReg)
+ .addReg(BasePtr).addImm(HighOffset).addReg(0);
+ else {
+ // Load the high offset into the scratch register and use it as
+ // an index.
+ TII->loadImmediate(MBB, MI, ScratchReg, HighOffset);
+ BuildMI(MBB, MI, DL, TII->get(SystemZ::AGR),ScratchReg)
+ .addReg(ScratchReg, RegState::Kill).addReg(BasePtr);
+ }
+
+ // Use the scratch register as the base. It then dies here.
+ MI->getOperand(FIOperandNum).ChangeToRegister(ScratchReg,
+ false, false, true);
}
-
- MI.getOperand(i).ChangeToImmediate(NumBytes + MI.getOperand(i).getImm());
}
+ MI->setDesc(TII->get(OpcodeForOffset));
+ MI->getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
}
-unsigned SystemZRegisterInfo::getRARegister() const {
- assert(0 && "What is the return address register");
- return 0;
-}
-
-unsigned SystemZRegisterInfo::getFrameRegister(MachineFunction &MF) const {
- assert(0 && "What is the frame register");
- return 0;
+unsigned
+SystemZRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
+ const SystemZFrameLowering *TFI = getFrameLowering(MF);
+ return TFI->hasFP(MF) ? SystemZ::R11D : SystemZ::R15D;
}
-
-unsigned SystemZRegisterInfo::getEHExceptionRegister() const {
- assert(0 && "What is the exception register");
- return 0;
-}
-
-unsigned SystemZRegisterInfo::getEHHandlerRegister() const {
- assert(0 && "What is the exception handler register");
- return 0;
-}
-
-int SystemZRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
- assert(0 && "What is the dwarf register number");
- return -1;
-}
-
-#include "SystemZGenRegisterInfo.inc"
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