blob: b53b4baa00c0f7ed0b46cbfa83520e2d11d27ce4 [file] [log] [blame]
//===- MipsInstrFormats.td - Mips Instruction Formats ------*- tablegen -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Describe MIPS instructions format
//
// CPU INSTRUCTION FORMATS
//
// opcode - operation code.
// rs - src reg.
// rt - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr).
// rd - dst reg, only used on 3 regs instr.
// shamt - only used on shift instructions, contains the shift amount.
// funct - combined with opcode field give us an operation code.
//
//===----------------------------------------------------------------------===//
// Format specifies the encoding used by the instruction. This is part of the
// ad-hoc solution used to emit machine instruction encodings by our machine
// code emitter.
class Format<bits<4> val> {
bits<4> Value = val;
}
def Pseudo : Format<0>;
def FrmR : Format<1>;
def FrmI : Format<2>;
def FrmJ : Format<3>;
def FrmFR : Format<4>;
def FrmFI : Format<5>;
def FrmOther : Format<6>; // Instruction w/ a custom format
// Generic Mips Format
class MipsInst<dag outs, dag ins, string asmstr, list<dag> pattern,
InstrItinClass itin, Format f>: Instruction
{
field bits<32> Inst;
Format Form = f;
let Namespace = "Mips";
bits<6> Opcode = 0;
// Top 6 bits are the 'opcode' field
let Inst{31-26} = Opcode;
let OutOperandList = outs;
let InOperandList = ins;
let AsmString = asmstr;
let Pattern = pattern;
let Itinerary = itin;
//
// Attributes specific to Mips instructions...
//
bits<4> FormBits = Form.Value;
// TSFlags layout should be kept in sync with MipsInstrInfo.h.
let TSFlags{3-0} = FormBits;
}
// Mips Pseudo Instructions Format
class MipsPseudo<dag outs, dag ins, string asmstr, list<dag> pattern>:
MipsInst<outs, ins, asmstr, pattern, IIPseudo, Pseudo> {
let isCodeGenOnly = 1;
let isPseudo = 1;
}
//===----------------------------------------------------------------------===//
// Format R instruction class in Mips : <|opcode|rs|rt|rd|shamt|funct|>
//===----------------------------------------------------------------------===//
class FR<bits<6> op, bits<6> _funct, dag outs, dag ins, string asmstr,
list<dag> pattern, InstrItinClass itin>:
MipsInst<outs, ins, asmstr, pattern, itin, FrmR>
{
bits<5> rd;
bits<5> rs;
bits<5> rt;
bits<5> shamt;
bits<6> funct;
let Opcode = op;
let funct = _funct;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = shamt;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// Format I instruction class in Mips : <|opcode|rs|rt|immediate|>
//===----------------------------------------------------------------------===//
class FI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern,
InstrItinClass itin>: MipsInst<outs, ins, asmstr, pattern, itin, FrmI>
{
bits<5> rt;
bits<5> rs;
bits<16> imm16;
let Opcode = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-0} = imm16;
}
class CBranchBase<bits<6> op, dag outs, dag ins, string asmstr,
list<dag> pattern, InstrItinClass itin>:
MipsInst<outs, ins, asmstr, pattern, itin, FrmI>
{
bits<5> rs;
bits<5> rt;
bits<16> imm16;
let Opcode = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-0} = imm16;
}
//===----------------------------------------------------------------------===//
// Format J instruction class in Mips : <|opcode|address|>
//===----------------------------------------------------------------------===//
class FJ<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern,
InstrItinClass itin>: MipsInst<outs, ins, asmstr, pattern, itin, FrmJ>
{
bits<26> addr;
let Opcode = op;
let Inst{25-0} = addr;
}
//===----------------------------------------------------------------------===//
//
// FLOATING POINT INSTRUCTION FORMATS
//
// opcode - operation code.
// fs - src reg.
// ft - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr).
// fd - dst reg, only used on 3 regs instr.
// fmt - double or single precision.
// funct - combined with opcode field give us an operation code.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Format FR instruction class in Mips : <|opcode|fmt|ft|fs|fd|funct|>
//===----------------------------------------------------------------------===//
class FFR<bits<6> op, bits<6> _funct, bits<5> _fmt, dag outs, dag ins,
string asmstr, list<dag> pattern> :
MipsInst<outs, ins, asmstr, pattern, NoItinerary, FrmFR>
{
bits<5> fd;
bits<5> fs;
bits<5> ft;
bits<5> fmt;
bits<6> funct;
let Opcode = op;
let funct = _funct;
let fmt = _fmt;
let Inst{25-21} = fmt;
let Inst{20-16} = ft;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// Format FI instruction class in Mips : <|opcode|base|ft|immediate|>
//===----------------------------------------------------------------------===//
class FFI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern>:
MipsInst<outs, ins, asmstr, pattern, NoItinerary, FrmFI>
{
bits<5> ft;
bits<5> base;
bits<16> imm16;
let Opcode = op;
let Inst{25-21} = base;
let Inst{20-16} = ft;
let Inst{15-0} = imm16;
}
//===----------------------------------------------------------------------===//
// Compare instruction class in Mips : <|010001|fmt|ft|fs|0000011|condcode|>
//===----------------------------------------------------------------------===//
class FCC<bits<5> _fmt, dag outs, dag ins, string asmstr, list<dag> pattern> :
MipsInst<outs, ins, asmstr, pattern, NoItinerary, FrmOther>
{
bits<5> fs;
bits<5> ft;
bits<4> cc;
bits<5> fmt;
let Opcode = 0x11;
let fmt = _fmt;
let Inst{25-21} = fmt;
let Inst{20-16} = ft;
let Inst{15-11} = fs;
let Inst{10-6} = 0;
let Inst{5-4} = 0b11;
let Inst{3-0} = cc;
}
class FCMOV<bits<1> _tf, dag outs, dag ins, string asmstr,
list<dag> pattern> :
MipsInst<outs, ins, asmstr, pattern, NoItinerary, FrmOther>
{
bits<5> rd;
bits<5> rs;
bits<3> cc;
bits<1> tf;
let Opcode = 0;
let tf = _tf;
let Inst{25-21} = rs;
let Inst{20-18} = cc;
let Inst{17} = 0;
let Inst{16} = tf;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = 1;
}
class FFCMOV<bits<5> _fmt, bits<1> _tf, dag outs, dag ins, string asmstr,
list<dag> pattern> :
MipsInst<outs, ins, asmstr, pattern, NoItinerary, FrmOther>
{
bits<5> fd;
bits<5> fs;
bits<3> cc;
bits<5> fmt;
bits<1> tf;
let Opcode = 17;
let fmt = _fmt;
let tf = _tf;
let Inst{25-21} = fmt;
let Inst{20-18} = cc;
let Inst{17} = 0;
let Inst{16} = tf;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-0} = 17;
}
// FP unary instructions without patterns.
class FFR1<bits<6> funct, bits<5> fmt, string opstr, string fmtstr,
RegisterClass DstRC, RegisterClass SrcRC> :
FFR<0x11, funct, fmt, (outs DstRC:$fd), (ins SrcRC:$fs),
!strconcat(opstr, ".", fmtstr, "\t$fd, $fs"), []> {
let ft = 0;
}
// FP unary instructions with patterns.
class FFR1P<bits<6> funct, bits<5> fmt, string opstr, string fmtstr,
RegisterClass DstRC, RegisterClass SrcRC, SDNode OpNode> :
FFR<0x11, funct, fmt, (outs DstRC:$fd), (ins SrcRC:$fs),
!strconcat(opstr, ".", fmtstr, "\t$fd, $fs"),
[(set DstRC:$fd, (OpNode SrcRC:$fs))]> {
let ft = 0;
}
class FFR2P<bits<6> funct, bits<5> fmt, string opstr,
string fmtstr, RegisterClass RC, SDNode OpNode> :
FFR<0x11, funct, fmt, (outs RC:$fd), (ins RC:$fs, RC:$ft),
!strconcat(opstr, ".", fmtstr, "\t$fd, $fs, $ft"),
[(set RC:$fd, (OpNode RC:$fs, RC:$ft))]>;