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//===-- MipsMachineFunctionInfo.cpp - Private data used for Mips ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "MipsMachineFunction.h"
#include "MCTargetDesc/MipsABIInfo.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
static cl::opt<bool>
FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
cl::desc("Always use $gp as the global base register."));
MipsFunctionInfo::~MipsFunctionInfo() = default;
bool MipsFunctionInfo::globalBaseRegSet() const {
return GlobalBaseReg;
}
static const TargetRegisterClass &getGlobalBaseRegClass(MachineFunction &MF) {
auto &STI = static_cast<const MipsSubtarget &>(MF.getSubtarget());
auto &TM = static_cast<const MipsTargetMachine &>(MF.getTarget());
if (STI.inMips16Mode())
return Mips::CPU16RegsRegClass;
if (STI.inMicroMipsMode())
return Mips::GPRMM16RegClass;
if (TM.getABI().IsN64())
return Mips::GPR64RegClass;
return Mips::GPR32RegClass;
}
Register MipsFunctionInfo::getGlobalBaseReg(MachineFunction &MF) {
if (!GlobalBaseReg)
GlobalBaseReg =
MF.getRegInfo().createVirtualRegister(&getGlobalBaseRegClass(MF));
return GlobalBaseReg;
}
Register MipsFunctionInfo::getGlobalBaseRegForGlobalISel(MachineFunction &MF) {
if (!GlobalBaseReg) {
getGlobalBaseReg(MF);
initGlobalBaseReg(MF);
}
return GlobalBaseReg;
}
void MipsFunctionInfo::initGlobalBaseReg(MachineFunction &MF) {
if (!GlobalBaseReg)
return;
MachineBasicBlock &MBB = MF.front();
MachineBasicBlock::iterator I = MBB.begin();
MachineRegisterInfo &RegInfo = MF.getRegInfo();
const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
DebugLoc DL;
const TargetRegisterClass *RC;
const MipsABIInfo &ABI =
static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI();
RC = (ABI.IsN64()) ? &Mips::GPR64RegClass : &Mips::GPR32RegClass;
Register V0 = RegInfo.createVirtualRegister(RC);
Register V1 = RegInfo.createVirtualRegister(RC);
if (ABI.IsN64()) {
MF.getRegInfo().addLiveIn(Mips::T9_64);
MBB.addLiveIn(Mips::T9_64);
// lui $v0, %hi(%neg(%gp_rel(fname)))
// daddu $v1, $v0, $t9
// daddiu $globalbasereg, $v1, %lo(%neg(%gp_rel(fname)))
const GlobalValue *FName = &MF.getFunction();
BuildMI(MBB, I, DL, TII.get(Mips::LUi64), V0)
.addGlobalAddress(FName, 0, MipsII::MO_GPOFF_HI);
BuildMI(MBB, I, DL, TII.get(Mips::DADDu), V1).addReg(V0)
.addReg(Mips::T9_64);
BuildMI(MBB, I, DL, TII.get(Mips::DADDiu), GlobalBaseReg).addReg(V1)
.addGlobalAddress(FName, 0, MipsII::MO_GPOFF_LO);
return;
}
if (!MF.getTarget().isPositionIndependent()) {
// Set global register to __gnu_local_gp.
//
// lui $v0, %hi(__gnu_local_gp)
// addiu $globalbasereg, $v0, %lo(__gnu_local_gp)
BuildMI(MBB, I, DL, TII.get(Mips::LUi), V0)
.addExternalSymbol("__gnu_local_gp", MipsII::MO_ABS_HI);
BuildMI(MBB, I, DL, TII.get(Mips::ADDiu), GlobalBaseReg).addReg(V0)
.addExternalSymbol("__gnu_local_gp", MipsII::MO_ABS_LO);
return;
}
MF.getRegInfo().addLiveIn(Mips::T9);
MBB.addLiveIn(Mips::T9);
if (ABI.IsN32()) {
// lui $v0, %hi(%neg(%gp_rel(fname)))
// addu $v1, $v0, $t9
// addiu $globalbasereg, $v1, %lo(%neg(%gp_rel(fname)))
const GlobalValue *FName = &MF.getFunction();
BuildMI(MBB, I, DL, TII.get(Mips::LUi), V0)
.addGlobalAddress(FName, 0, MipsII::MO_GPOFF_HI);
BuildMI(MBB, I, DL, TII.get(Mips::ADDu), V1).addReg(V0).addReg(Mips::T9);
BuildMI(MBB, I, DL, TII.get(Mips::ADDiu), GlobalBaseReg).addReg(V1)
.addGlobalAddress(FName, 0, MipsII::MO_GPOFF_LO);
return;
}
assert(ABI.IsO32());
// For O32 ABI, the following instruction sequence is emitted to initialize
// the global base register:
//
// 0. lui $2, %hi(_gp_disp)
// 1. addiu $2, $2, %lo(_gp_disp)
// 2. addu $globalbasereg, $2, $t9
//
// We emit only the last instruction here.
//
// GNU linker requires that the first two instructions appear at the beginning
// of a function and no instructions be inserted before or between them.
// The two instructions are emitted during lowering to MC layer in order to
// avoid any reordering.
//
// Register $2 (Mips::V0) is added to the list of live-in registers to ensure
// the value instruction 1 (addiu) defines is valid when instruction 2 (addu)
// reads it.
MF.getRegInfo().addLiveIn(Mips::V0);
MBB.addLiveIn(Mips::V0);
BuildMI(MBB, I, DL, TII.get(Mips::ADDu), GlobalBaseReg)
.addReg(Mips::V0).addReg(Mips::T9);
}
void MipsFunctionInfo::createEhDataRegsFI(MachineFunction &MF) {
const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
for (int I = 0; I < 4; ++I) {
const TargetRegisterClass &RC =
static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI().IsN64()
? Mips::GPR64RegClass
: Mips::GPR32RegClass;
EhDataRegFI[I] = MF.getFrameInfo().CreateStackObject(
TRI.getSpillSize(RC), TRI.getSpillAlign(RC), false);
}
}
void MipsFunctionInfo::createISRRegFI(MachineFunction &MF) {
// ISRs require spill slots for Status & ErrorPC Coprocessor 0 registers.
// The current implementation only supports Mips32r2+ not Mips64rX. Status
// is always 32 bits, ErrorPC is 32 or 64 bits dependent on architecture,
// however Mips32r2+ is the supported architecture.
const TargetRegisterClass &RC = Mips::GPR32RegClass;
const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
for (int I = 0; I < 2; ++I)
ISRDataRegFI[I] = MF.getFrameInfo().CreateStackObject(
TRI.getSpillSize(RC), TRI.getSpillAlign(RC), false);
}
bool MipsFunctionInfo::isEhDataRegFI(int FI) const {
return CallsEhReturn && (FI == EhDataRegFI[0] || FI == EhDataRegFI[1]
|| FI == EhDataRegFI[2] || FI == EhDataRegFI[3]);
}
bool MipsFunctionInfo::isISRRegFI(int FI) const {
return IsISR && (FI == ISRDataRegFI[0] || FI == ISRDataRegFI[1]);
}
MachinePointerInfo MipsFunctionInfo::callPtrInfo(MachineFunction &MF,
const char *ES) {
return MachinePointerInfo(MF.getPSVManager().getExternalSymbolCallEntry(ES));
}
MachinePointerInfo MipsFunctionInfo::callPtrInfo(MachineFunction &MF,
const GlobalValue *GV) {
return MachinePointerInfo(MF.getPSVManager().getGlobalValueCallEntry(GV));
}
int MipsFunctionInfo::getMoveF64ViaSpillFI(MachineFunction &MF,
const TargetRegisterClass *RC) {
const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
if (MoveF64ViaSpillFI == -1) {
MoveF64ViaSpillFI = MF.getFrameInfo().CreateStackObject(
TRI.getSpillSize(*RC), TRI.getSpillAlign(*RC), false);
}
return MoveF64ViaSpillFI;
}
void MipsFunctionInfo::anchor() {}
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