llvm-6502/lib/Target/X86/X86ScheduleBtVer2.td

//=- X86ScheduleBtVer2.td - X86 BtVer2 (Jaguar) Scheduling ---*- tablegen -*-=//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the machine model for AMD btver2 (Jaguar) to support
// instruction scheduling and other instruction cost heuristics. Based off AMD Software
// Optimization Guide for AMD Family 16h Processors & Instruction Latency appendix.
//
//===----------------------------------------------------------------------===//

def BtVer2Model : SchedMachineModel {
  // All x86 instructions are modeled as a single micro-op, and btver2 can
  // decode 2 instructions per cycle.
  let IssueWidth = 2;
  let MicroOpBufferSize = 64; // Retire Control Unit
  let LoadLatency = 5; // FPU latency (worse case cf Integer 3 cycle latency)
  let HighLatency = 25;
  let MispredictPenalty = 14; // Minimum branch misdirection penalty
  let PostRAScheduler = 1;

  // FIXME: SSE4/AVX is unimplemented. This flag is set to allow
  // the scheduler to assign a default model to unrecognized opcodes.
  let CompleteModel = 0;
}

let SchedModel = BtVer2Model in {

// Jaguar can issue up to 6 micro-ops in one cycle
def JALU0 : ProcResource<1>; // Integer Pipe0: integer ALU0 (also handle FP->INT jam)
def JALU1 : ProcResource<1>; // Integer Pipe1: integer ALU1/MUL/DIV
def JLAGU : ProcResource<1>; // Integer Pipe2: LAGU
def JSAGU : ProcResource<1>; // Integer Pipe3: SAGU (also handles 3-operand LEA)
def JFPU0 : ProcResource<1>; // Vector/FPU Pipe0: VALU0/VIMUL/FPA
def JFPU1 : ProcResource<1>; // Vector/FPU Pipe1: VALU1/STC/FPM

// Any pipe - FIXME we need this until we can discriminate between int/fpu load/store/moves properly
def JAny : ProcResGroup<[JALU0, JALU1, JLAGU, JSAGU, JFPU0, JFPU1]>;

// Integer Pipe Scheduler
def JALU01 : ProcResGroup<[JALU0, JALU1]> {
  let BufferSize=20;
}

// AGU Pipe Scheduler
def JLSAGU : ProcResGroup<[JLAGU, JSAGU]> {
  let BufferSize=12;
}

// Fpu Pipe Scheduler
def JFPU01 : ProcResGroup<[JFPU0, JFPU1]> {
  let BufferSize=18;
}

def JDiv    : ProcResource<1>; // integer division
def JMul    : ProcResource<1>; // integer multiplication
def JVALU0  : ProcResource<1>; // vector integer
def JVALU1  : ProcResource<1>; // vector integer
def JVIMUL  : ProcResource<1>; // vector integer multiplication
def JSTC    : ProcResource<1>; // vector store/convert
def JFPM    : ProcResource<1>; // FP multiplication
def JFPA    : ProcResource<1>; // FP addition

// Integer loads are 3 cycles, so ReadAfterLd registers needn't be available until 3
// cycles after the memory operand.
def : ReadAdvance<ReadAfterLd, 3>;

// Many SchedWrites are defined in pairs with and without a folded load.
// Instructions with folded loads are usually micro-fused, so they only appear
// as two micro-ops when dispatched by the schedulers.
// This multiclass defines the resource usage for variants with and without
// folded loads.
multiclass JWriteResIntPair<X86FoldableSchedWrite SchedRW,
                          ProcResourceKind ExePort,
                          int Lat> {
  // Register variant is using a single cycle on ExePort.
  def : WriteRes<SchedRW, [ExePort]> { let Latency = Lat; }

  // Memory variant also uses a cycle on JLAGU and adds 3 cycles to the
  // latency.
  def : WriteRes<SchedRW.Folded, [JLAGU, ExePort]> {
     let Latency = !add(Lat, 3);
  }
}

multiclass JWriteResFpuPair<X86FoldableSchedWrite SchedRW,
                          ProcResourceKind ExePort,
                          int Lat> {
  // Register variant is using a single cycle on ExePort.
  def : WriteRes<SchedRW, [ExePort]> { let Latency = Lat; }

  // Memory variant also uses a cycle on JLAGU and adds 5 cycles to the
  // latency.
  def : WriteRes<SchedRW.Folded, [JLAGU, ExePort]> {
     let Latency = !add(Lat, 5);
  }
}

// A folded store needs a cycle on the SAGU for the store data.
def : WriteRes<WriteRMW, [JSAGU]>;

////////////////////////////////////////////////////////////////////////////////
// Arithmetic.
////////////////////////////////////////////////////////////////////////////////

defm : JWriteResIntPair<WriteALU,   JALU01, 1>;
defm : JWriteResIntPair<WriteIMul,  JALU1,  3>;

def  : WriteRes<WriteIMulH, [JALU1]> {
  let Latency = 6;
  let ResourceCycles = [4];
}

// FIXME 8/16 bit divisions
def : WriteRes<WriteIDiv, [JALU1, JDiv]> {
  let Latency = 25;
  let ResourceCycles = [1, 25];
}
def : WriteRes<WriteIDivLd, [JALU1, JLAGU, JDiv]> {
  let Latency = 41;
  let ResourceCycles = [1, 1, 25];
}

// This is for simple LEAs with one or two input operands.
// FIXME: SAGU 3-operand LEA
def : WriteRes<WriteLEA, [JALU01]>;

////////////////////////////////////////////////////////////////////////////////
// Integer shifts and rotates.
////////////////////////////////////////////////////////////////////////////////

defm : JWriteResIntPair<WriteShift, JALU01, 1>;

////////////////////////////////////////////////////////////////////////////////
// Loads, stores, and moves, not folded with other operations.
// FIXME: Split x86 and SSE load/store/moves
////////////////////////////////////////////////////////////////////////////////

def : WriteRes<WriteLoad,  [JLAGU]> { let Latency = 5; }
def : WriteRes<WriteStore, [JSAGU]>;
def : WriteRes<WriteMove,  [JAny]>;

////////////////////////////////////////////////////////////////////////////////
// Idioms that clear a register, like xorps %xmm0, %xmm0.
// These can often bypass execution ports completely.
////////////////////////////////////////////////////////////////////////////////

def : WriteRes<WriteZero,  []>;

////////////////////////////////////////////////////////////////////////////////
// Branches don't produce values, so they have no latency, but they still
// consume resources. Indirect branches can fold loads.
////////////////////////////////////////////////////////////////////////////////

defm : JWriteResIntPair<WriteJump,  JALU01, 1>;

////////////////////////////////////////////////////////////////////////////////
// Floating point. This covers both scalar and vector operations.
// FIXME: should we bother splitting JFPU pipe + unit stages for fast instructions?
// FIXME: Double precision latencies
// FIXME: SS vs PS latencies
// FIXME: RSQRT latencies
// FIXME: ymm latencies
////////////////////////////////////////////////////////////////////////////////

defm : JWriteResFpuPair<WriteFAdd,      JFPU0,  3>;
defm : JWriteResFpuPair<WriteFMul,      JFPU1,  2>;
defm : JWriteResFpuPair<WriteFRcp,      JFPU1,  2>;
defm : JWriteResFpuPair<WriteFShuffle, JFPU01,  1>;
defm : JWriteResFpuPair<WriteFBlend,   JFPU01,  1>;
defm : JWriteResFpuPair<WriteFShuffle256, JFPU01, 1>;

def : WriteRes<WriteFSqrt, [JFPU1, JLAGU, JFPM]> {
  let Latency = 21;
  let ResourceCycles = [1, 1, 21];
}
def : WriteRes<WriteFSqrtLd, [JFPU1, JLAGU, JFPM]> {
  let Latency = 26;
  let ResourceCycles = [1, 1, 21];
}

def : WriteRes<WriteFDiv, [JFPU1, JLAGU, JFPM]> {
  let Latency = 19;
  let ResourceCycles = [1, 1, 19];
}
def : WriteRes<WriteFDivLd, [JFPU1, JLAGU, JFPM]> {
  let Latency = 24;
  let ResourceCycles = [1, 1, 19];
}

// FIXME: integer pipes
defm : JWriteResFpuPair<WriteCvtF2I,    JFPU1,  3>; // Float -> Integer.
defm : JWriteResFpuPair<WriteCvtI2F,    JFPU1,  3>; // Integer -> Float.
defm : JWriteResFpuPair<WriteCvtF2F,    JFPU1,  3>; // Float -> Float size conversion.

def : WriteRes<WriteFVarBlend, [JFPU01]> {
  let Latency = 2;
  let ResourceCycles = [2];
}
def : WriteRes<WriteFVarBlendLd, [JLAGU, JFPU01]> {
  let Latency = 7;
  let ResourceCycles = [1, 2];
}

// Vector integer operations.
defm : JWriteResFpuPair<WriteVecALU,   JFPU01,  1>;
defm : JWriteResFpuPair<WriteVecShift, JFPU01,  1>;
defm : JWriteResFpuPair<WriteVecIMul,  JFPU0,   2>;
defm : JWriteResFpuPair<WriteShuffle,  JFPU01,  1>;
defm : JWriteResFpuPair<WriteBlend,    JFPU01,  1>;
defm : JWriteResFpuPair<WriteVecLogic, JFPU01,  1>;
defm : JWriteResFpuPair<WriteShuffle256, JFPU01, 1>;

def : WriteRes<WriteVarBlend, [JFPU01]> {
  let Latency = 2;
  let ResourceCycles = [2];
}
def : WriteRes<WriteVarBlendLd, [JLAGU, JFPU01]> {
  let Latency = 7;
  let ResourceCycles = [1, 2];
}

// FIXME: why do we need to define AVX2 resource on CPU that doesn't have AVX2?
def : WriteRes<WriteVarVecShift, [JFPU01]> {
  let Latency = 1;
  let ResourceCycles = [1];
}
def : WriteRes<WriteVarVecShiftLd, [JLAGU, JFPU01]> {
  let Latency = 6;
  let ResourceCycles = [1, 1];
}

def : WriteRes<WriteMPSAD, [JFPU0]> {
  let Latency = 3;
  let ResourceCycles = [2];
}
def : WriteRes<WriteMPSADLd, [JLAGU, JFPU0]> {
  let Latency = 8;
  let ResourceCycles = [1, 2];
}

////////////////////////////////////////////////////////////////////////////////
// String instructions.
// Packed Compare Implicit Length Strings, Return Mask
// FIXME: approximate latencies + pipe dependencies
////////////////////////////////////////////////////////////////////////////////

def : WriteRes<WritePCmpIStrM, [JFPU01]> {
  let Latency = 7;
  let ResourceCycles = [2];
}
def : WriteRes<WritePCmpIStrMLd, [JLAGU, JFPU01]> {
  let Latency = 12;
  let ResourceCycles = [1, 2];
}

// Packed Compare Explicit Length Strings, Return Mask
def : WriteRes<WritePCmpEStrM, [JFPU01]> {
  let Latency = 13;
  let ResourceCycles = [5];
}
def : WriteRes<WritePCmpEStrMLd, [JLAGU, JFPU01]> {
  let Latency = 18;
  let ResourceCycles = [1, 5];
}

// Packed Compare Implicit Length Strings, Return Index
def : WriteRes<WritePCmpIStrI, [JFPU01]> {
  let Latency = 6;
  let ResourceCycles = [2];
}
def : WriteRes<WritePCmpIStrILd, [JLAGU, JFPU01]> {
  let Latency = 11;
  let ResourceCycles = [1, 2];
}

// Packed Compare Explicit Length Strings, Return Index
def : WriteRes<WritePCmpEStrI, [JFPU01]> {
  let Latency = 13;
  let ResourceCycles = [5];
}
def : WriteRes<WritePCmpEStrILd, [JLAGU, JFPU01]> {
  let Latency = 18;
  let ResourceCycles = [1, 5];
}

////////////////////////////////////////////////////////////////////////////////
// AES Instructions.
////////////////////////////////////////////////////////////////////////////////

def : WriteRes<WriteAESDecEnc, [JFPU01, JVIMUL]> {
  let Latency = 3;
  let ResourceCycles = [1, 1];
}
def : WriteRes<WriteAESDecEncLd, [JFPU01, JLAGU, JVIMUL]> {
  let Latency = 8;
  let ResourceCycles = [1, 1, 1];
}

def : WriteRes<WriteAESIMC, [JVIMUL]> {
  let Latency = 2;
  let ResourceCycles = [1];
}
def : WriteRes<WriteAESIMCLd, [JLAGU, JVIMUL]> {
  let Latency = 7;
  let ResourceCycles = [1, 1];
}

def : WriteRes<WriteAESKeyGen, [JVIMUL]> {
  let Latency = 2;
  let ResourceCycles = [1];
}
def : WriteRes<WriteAESKeyGenLd, [JLAGU, JVIMUL]> {
  let Latency = 7;
  let ResourceCycles = [1, 1];
}

////////////////////////////////////////////////////////////////////////////////
// Carry-less multiplication instructions.
////////////////////////////////////////////////////////////////////////////////

def : WriteRes<WriteCLMul, [JVIMUL]> {
  let Latency = 2;
  let ResourceCycles = [1];
}
def : WriteRes<WriteCLMulLd, [JLAGU, JVIMUL]> {
  let Latency = 7;
  let ResourceCycles = [1, 1];
}

// FIXME: pipe for system/microcode?
def : WriteRes<WriteSystem,     [JAny]> { let Latency = 100; }
def : WriteRes<WriteMicrocoded, [JAny]> { let Latency = 100; }
def : WriteRes<WriteFence,  [JSAGU]>;
def : WriteRes<WriteNop, []>;
} // SchedModel