llvm/lib/Target/RISCV/RISCVSchedSyntacoreSCR1.td

//==- RISCVSchedSyntacoreSCR1.td - Syntacore SCR1 Scheduling Definitions --------*- tablegen -*-=//
//
// 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
//
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//

// SCR1: https://github.com/syntacore/scr1

// This model covers SYNTACORE_SCR1_CFG_RV32IMC_MAX configuration (syntacore-scr1-max).
// SYNTACORE_SCR1_CFG_RV32IC_BASE (syntacore-scr1-base) configuration has essentially
// same scheduling characteristics.

// SCR1 is single-issue in-order processor
def SyntacoreSCR1Model : SchedMachineModel {
  let MicroOpBufferSize = 0;
  let IssueWidth = 1;
  let LoadLatency = 2;
  let MispredictPenalty = 3;
  let CompleteModel = 0;
  let UnsupportedFeatures = [HasStdExtZbkb, HasStdExtZbkc, HasStdExtZbkx,
                             HasStdExtZknd, HasStdExtZkne, HasStdExtZknh,
                             HasStdExtZksed, HasStdExtZksh, HasStdExtZkr,
                             HasVInstructions];
}

let SchedModel = SyntacoreSCR1Model in {

let BufferSize = 0 in {
def SCR1_ALU : ProcResource<1>;
def SCR1_LSU : ProcResource<1>;
def SCR1_MUL : ProcResource<1>;
def SCR1_DIV : ProcResource<1>;
def SCR1_CFU : ProcResource<1>;
}

// Branching
def : WriteRes<WriteJmp, [SCR1_CFU]>;
def : WriteRes<WriteJal, [SCR1_CFU]>;
def : WriteRes<WriteJalr, [SCR1_CFU]>;

// Integer arithmetic and logic
def : WriteRes<WriteIALU32, [SCR1_ALU]>;
def : WriteRes<WriteIALU, [SCR1_ALU]>;
def : WriteRes<WriteShiftImm32, [SCR1_ALU]>;
def : WriteRes<WriteShiftImm, [SCR1_ALU]>;
def : WriteRes<WriteShiftReg32, [SCR1_ALU]>;
def : WriteRes<WriteShiftReg, [SCR1_ALU]>;

// Integer multiplication: single-cycle multiplier in SCR1_CFG_RV32IMC_MAX
def : WriteRes<WriteIMul, [SCR1_MUL]>;
def : WriteRes<WriteIMul32, [SCR1_MUL]>;

// Integer division/remainder: latency 33, inverse throughput 33
let Latency = 33, ReleaseAtCycles = [33] in {
def : WriteRes<WriteIDiv32, [SCR1_DIV]>;
def : WriteRes<WriteIDiv, [SCR1_DIV]>;
def : WriteRes<WriteIRem32, [SCR1_DIV]>;
def : WriteRes<WriteIRem, [SCR1_DIV]>;
}

// Load/store instructions on SCR1 have latency 2 and inverse throughput 2
// (SCR1_CFG_RV32IMC_MAX includes TCM)
let Latency = 2, ReleaseAtCycles=[2] in {
// Memory
def : WriteRes<WriteSTB, [SCR1_LSU]>;
def : WriteRes<WriteSTH, [SCR1_LSU]>;
def : WriteRes<WriteSTW, [SCR1_LSU]>;
def : WriteRes<WriteSTD, [SCR1_LSU]>;
def : WriteRes<WriteLDB, [SCR1_LSU]>;
def : WriteRes<WriteLDH, [SCR1_LSU]>;
def : WriteRes<WriteLDW, [SCR1_LSU]>;
def : WriteRes<WriteLDD, [SCR1_LSU]>;
}

// Others
def : WriteRes<WriteCSR, []>;
def : WriteRes<WriteNop, []>;

def : InstRW<[WriteIALU], (instrs COPY)>;

//===----------------------------------------------------------------------===//
// Bypasses (none)
def : ReadAdvance<ReadJmp, 0>;
def : ReadAdvance<ReadJalr, 0>;
def : ReadAdvance<ReadCSR, 0>;
def : ReadAdvance<ReadStoreData, 0>;
def : ReadAdvance<ReadMemBase, 0>;
def : ReadAdvance<ReadIALU, 0>;
def : ReadAdvance<ReadIALU32, 0>;
def : ReadAdvance<ReadShiftImm, 0>;
def : ReadAdvance<ReadShiftImm32, 0>;
def : ReadAdvance<ReadShiftReg, 0>;
def : ReadAdvance<ReadShiftReg32, 0>;
def : ReadAdvance<ReadIDiv, 0>;
def : ReadAdvance<ReadIDiv32, 0>;
def : ReadAdvance<ReadIRem, 0>;
def : ReadAdvance<ReadIRem32, 0>;
def : ReadAdvance<ReadIMul, 0>;
def : ReadAdvance<ReadIMul32, 0>;

//===----------------------------------------------------------------------===//
// Unsupported extensions
defm : UnsupportedSchedA;
defm : UnsupportedSchedF;
defm : UnsupportedSchedSFB;
defm : UnsupportedSchedV;
defm : UnsupportedSchedZabha;
defm : UnsupportedSchedZba;
defm : UnsupportedSchedZbb;
defm : UnsupportedSchedZbc;
defm : UnsupportedSchedZbs;
defm : UnsupportedSchedZbkb;
defm : UnsupportedSchedZbkx;
defm : UnsupportedSchedZfa;
defm : UnsupportedSchedXsfvcp;
defm : UnsupportedSchedZvk;
}