//===----------------------------------------------------------------------===//
#include "Mips16InstrInfo.h"
-#include "MipsTargetMachine.h"
-#include "MipsMachineFunction.h"
#include "InstPrinter/MipsInstPrinter.h"
+#include "MipsMachineFunction.h"
+#include "MipsTargetMachine.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringRef.h"
using namespace llvm;
+static cl::opt<bool> NeverUseSaveRestore(
+ "mips16-never-use-save-restore",
+ cl::init(false),
+ cl::desc("For testing ability to adjust stack pointer "
+ "without save/restore instruction"),
+ cl::Hidden);
+
+
Mips16InstrInfo::Mips16InstrInfo(MipsTargetMachine &tm)
: MipsInstrInfo(tm, Mips::BimmX16),
RI(*tm.getSubtargetImpl(), *this) {}
return 0;
}
+// Adjust SP by FrameSize bytes. Save RA, S0, S1
+void Mips16InstrInfo::makeFrame(unsigned SP, int64_t FrameSize,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
+ if (!NeverUseSaveRestore) {
+ if (isUInt<11>(FrameSize))
+ BuildMI(MBB, I, DL, get(Mips::SaveRaF16)).addImm(FrameSize);
+ else {
+ int Base = 2040; // should create template function like isUInt that
+ // returns largest possible n bit unsigned integer
+ int64_t Remainder = FrameSize - Base;
+ BuildMI(MBB, I, DL, get(Mips::SaveRaF16)). addImm(Base);
+ if (isInt<16>(-Remainder))
+ BuildMI(MBB, I, DL, get(Mips::AddiuSpImmX16)). addImm(-Remainder);
+ else
+ adjustStackPtrBig(SP, -Remainder, MBB, I, Mips::V0, Mips::V1);
+ }
+
+ }
+ else {
+ //
+ // sw ra, -4[sp]
+ // sw s1, -8[sp]
+ // sw s0, -12[sp]
+
+ MachineInstrBuilder MIB1 = BuildMI(MBB, I, DL, get(Mips::SwRxSpImmX16),
+ Mips::RA);
+ MIB1.addReg(Mips::SP);
+ MIB1.addImm(-4);
+ MachineInstrBuilder MIB2 = BuildMI(MBB, I, DL, get(Mips::SwRxSpImmX16),
+ Mips::S1);
+ MIB2.addReg(Mips::SP);
+ MIB2.addImm(-8);
+ MachineInstrBuilder MIB3 = BuildMI(MBB, I, DL, get(Mips::SwRxSpImmX16),
+ Mips::S0);
+ MIB3.addReg(Mips::SP);
+ MIB3.addImm(-12);
+ adjustStackPtrBig(SP, -FrameSize, MBB, I, Mips::V0, Mips::V1);
+ }
+}
+
+// Adjust SP by FrameSize bytes. Restore RA, S0, S1
+void Mips16InstrInfo::restoreFrame(unsigned SP, int64_t FrameSize,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
+ if (!NeverUseSaveRestore) {
+ if (isUInt<11>(FrameSize))
+ BuildMI(MBB, I, DL, get(Mips::RestoreRaF16)).addImm(FrameSize);
+ else {
+ int Base = 2040; // should create template function like isUInt that
+ // returns largest possible n bit unsigned integer
+ int64_t Remainder = FrameSize - Base;
+ if (isInt<16>(Remainder))
+ BuildMI(MBB, I, DL, get(Mips::AddiuSpImmX16)). addImm(Remainder);
+ else
+ adjustStackPtrBig(SP, Remainder, MBB, I, Mips::A0, Mips::A1);
+ BuildMI(MBB, I, DL, get(Mips::RestoreRaF16)). addImm(Base);
+ }
+ }
+ else {
+ adjustStackPtrBig(SP, FrameSize, MBB, I, Mips::A0, Mips::A1);
+ // lw ra, -4[sp]
+ // lw s1, -8[sp]
+ // lw s0, -12[sp]
+ MachineInstrBuilder MIB1 = BuildMI(MBB, I, DL, get(Mips::LwRxSpImmX16),
+ Mips::A0);
+ MIB1.addReg(Mips::SP);
+ MIB1.addImm(-4);
+ MachineInstrBuilder MIB0 = BuildMI(MBB, I, DL, get(Mips::Move32R16),
+ Mips::RA);
+ MIB0.addReg(Mips::A0);
+ MachineInstrBuilder MIB2 = BuildMI(MBB, I, DL, get(Mips::LwRxSpImmX16),
+ Mips::S1);
+ MIB2.addReg(Mips::SP);
+ MIB2.addImm(-8);
+ MachineInstrBuilder MIB3 = BuildMI(MBB, I, DL, get(Mips::LwRxSpImmX16),
+ Mips::S0);
+ MIB3.addReg(Mips::SP);
+ MIB3.addImm(-12);
+ }
+
+}
+
+// Adjust SP by Amount bytes where bytes can be up to 32bit number.
+// This can only be called at times that we know that there is at least one free
+// register.
+// This is clearly safe at prologue and epilogue.
+//
+void Mips16InstrInfo::adjustStackPtrBig(unsigned SP, int64_t Amount,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I,
+ unsigned Reg1, unsigned Reg2) const {
+ DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
+// MachineRegisterInfo &RegInfo = MBB.getParent()->getRegInfo();
+// unsigned Reg1 = RegInfo.createVirtualRegister(&Mips::CPU16RegsRegClass);
+// unsigned Reg2 = RegInfo.createVirtualRegister(&Mips::CPU16RegsRegClass);
+ //
+ // li reg1, constant
+ // move reg2, sp
+ // add reg1, reg1, reg2
+ // move sp, reg1
+ //
+ //
+ MachineInstrBuilder MIB1 = BuildMI(MBB, I, DL, get(Mips::LwConstant32), Reg1);
+ MIB1.addImm(Amount);
+ MachineInstrBuilder MIB2 = BuildMI(MBB, I, DL, get(Mips::MoveR3216), Reg2);
+ MIB2.addReg(Mips::SP, RegState::Kill);
+ MachineInstrBuilder MIB3 = BuildMI(MBB, I, DL, get(Mips::AdduRxRyRz16), Reg1);
+ MIB3.addReg(Reg1);
+ MIB3.addReg(Reg2, RegState::Kill);
+ MachineInstrBuilder MIB4 = BuildMI(MBB, I, DL, get(Mips::Move32R16),
+ Mips::SP);
+ MIB4.addReg(Reg1, RegState::Kill);
+}
+
+void Mips16InstrInfo::adjustStackPtrBigUnrestricted(unsigned SP, int64_t Amount,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ assert(false && "adjust stack pointer amount exceeded");
+}
+
/// Adjust SP by Amount bytes.
void Mips16InstrInfo::adjustStackPtr(unsigned SP, int64_t Amount,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
- if (isInt<16>(Amount)) {
- if (Amount < 0)
- BuildMI(MBB, I, DL, get(Mips::SaveDecSpF16)). addImm(-Amount);
- else if (Amount > 0)
- BuildMI(MBB, I, DL, get(Mips::RestoreIncSpF16)).addImm(Amount);
- }
+ if (isInt<16>(Amount)) // need to change to addiu sp, ....and isInt<16>
+ BuildMI(MBB, I, DL, get(Mips::AddiuSpImmX16)). addImm(Amount);
else
- // not implemented for large values yet
- assert(false && "adjust stack pointer amount exceeded");
+ adjustStackPtrBigUnrestricted(SP, Amount, MBB, I);
+}
+
+/// This function generates the sequence of instructions needed to get the
+/// result of adding register REG and immediate IMM.
+unsigned
+Mips16InstrInfo::loadImmediate(int64_t Imm, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator II, DebugLoc DL,
+ unsigned *NewImm) const {
+
+ return 0;
}
unsigned Mips16InstrInfo::GetAnalyzableBrOpc(unsigned Opc) const {
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