//===----------------------------------------------------------------------===//
#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"
using namespace llvm;
SystemZRegisterInfo::SystemZRegisterInfo(SystemZTargetMachine &tm,
- const TargetInstrInfo &tii)
- : SystemZGenRegisterInfo(SystemZ::NOP, SystemZ::NOP),
+ const SystemZInstrInfo &tii)
+ : SystemZGenRegisterInfo(SystemZ::ADJCALLSTACKUP, SystemZ::ADJCALLSTACKDOWN),
TM(tm), TII(tii) {
}
const unsigned*
SystemZRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
static const unsigned CalleeSavedRegs[] = {
- SystemZ::R6, SystemZ::R7, SystemZ::R8, SystemZ::R9,
- SystemZ::R10, SystemZ::R11, SystemZ::R12, SystemZ::R13,
- SystemZ::F1, SystemZ::F3, SystemZ::F5, SystemZ::F7,
+ SystemZ::R6D, SystemZ::R7D, SystemZ::R8D, SystemZ::R9D,
+ 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::FP64RegClass, &SystemZ::FP64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass, 0
- };
- return CalleeSavedRegClasses;
-}
-
BitVector SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
if (hasFP(MF))
- Reserved.set(SystemZ::R11);
- Reserved.set(SystemZ::R14);
- Reserved.set(SystemZ::R15);
+ 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.
-//
+/// 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();
+ return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects();
}
void SystemZRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
- assert(0 && "Not implemented yet!");
+ MBB.erase(I);
+}
+
+int SystemZRegisterInfo::getFrameIndexOffset(const MachineFunction &MF,
+ int FI) const {
+ const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const SystemZMachineFunctionInfo *SystemZMFI =
+ MF.getInfo<SystemZMachineFunctionInfo>();
+ int Offset = MFI->getObjectOffset(FI) + MFI->getOffsetAdjustment();
+ uint64_t StackSize = MFI->getStackSize();
+
+ // 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 || MFI->hasCalls())
+ Offset -= TFI.getOffsetOfLocalArea();
+
+ return Offset;
}
-void SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const {
- assert(0 && "Not implemented yet!");
+unsigned
+SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, FrameIndexValue *Value,
+ 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!");
+ }
+
+ 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.
+ 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
+/// stack pointer by a constant value.
+static
+void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
+ int64_t NumBytes, const TargetInstrInfo &TII) {
+ unsigned Opc; uint64_t Chunk;
+ bool isSub = NumBytes < 0;
+ uint64_t Offset = isSub ? -NumBytes : NumBytes;
+
+ 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 ? -ThisVal : ThisVal);
+ // The PSW implicit def is dead.
+ MI->getOperand(3).setIsDead();
+ Offset -= ThisVal;
+ }
}
void SystemZRegisterInfo::emitPrologue(MachineFunction &MF) const {
- // Nothing here yet
+ 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();
+
+ // 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 = llvm::next(MF.begin()), E = MF.end();
+ I != E; ++I)
+ I->addLiveIn(SystemZ::R11D);
+
+ }
}
void SystemZRegisterInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
- // Nothing here yet
+ 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();
+
+ 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!");
+ }
+
+ 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);
+ }
}
unsigned SystemZRegisterInfo::getRARegister() const {
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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