riscv/riscv_zfh.isa

// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// This file contains the ISA description of the RiscV ZFH extention
// instructions.

isa ZFH {
  namespace mpact::sim::riscv::zfh;
  slots {
    riscv32_zfh;
  }
}

// First disasm field is 18 char wide and left justified.
disasm widths = {-18};

slot riscv_zfh_min {
  includes {
    #include "riscv/riscv_zfh_instructions.h"
  }
  default size = 4;
  default latency = 0;
  default opcode =
    disasm: "Unimplemented instruction at 0x%(@:08x)",
    semfunc: "&RV32VUnimplementedInstruction";
  opcodes {
    fmv_hx{: rs1 : frd},
      resources: {next_pc, rs1 : frd[0..]},
      semfunc: "&RiscVZfhFMvhx",
      disasm: "fmv.h.x", "%frd, %rs1";
    fcvt_sh{: frs1, rm : frd, fflags},
      resources: {next_pc, frs1 : frd[0..]},
      semfunc: "&RiscVZfhCvtSh",
      disasm: "fcvt.s.h", "%frd, %frs1";
    fcvt_hs{: frs1, rm : frd, fflags},
      resources: {next_pc, frs1 : frd[0..]},
      semfunc: "&RiscVZfhCvtHs",
      disasm: "fcvt.h.s", "%frd, %frs1";
    fcvt_dh{: frs1, rm : frd, fflags},
      resources: {next_pc, frs1 : frd[0..]},
      semfunc: "&RiscVZfhCvtDh",
      disasm: "fcvt.d.h", "%frd, %frs1";
    fcvt_hd{: frs1, rm : frd, fflags},
      resources: {next_pc, frs1 : frd[0..]},
      semfunc: "&RiscVZfhCvtHd",
      disasm: "fcvt.h.d", "%frd, %frs1";
  }
}

slot riscv32_zfh_min: riscv_zfh_min {
  includes {
    #include "riscv/riscv_i_instructions.h"
    #include "riscv/riscv_zfh_instructions.h"
  }
  default size = 4;
  default latency = 0;
  default opcode =
    disasm: "Unimplemented instruction at 0x%(@:08x)",
    semfunc: "&RV32VUnimplementedInstruction";
  opcodes {
    flh{(: rs1, I_imm12 : ), (: : frd)},
      resources: {next_pc, rs1 : frd[0..]},
      semfunc: "&RV32::RiscVILhu", "&RiscVZfhFlhChild",
      disasm: "flh", "%frd, %I_imm12(%rs1)";
    fsh{: rs1, S_imm12, frs2},
      resources: {next_pc, rs1, frs2},
      semfunc: "&RV32::RiscVISh",
      disasm: "fsh", "%frs2, %S_imm12(%rs1)";
    fmv_xh{: frs1 : rd},
      resources: {next_pc, frs1 : rd[0..]},
      semfunc: "&RV32::RiscVZfhFMvxh",
      disasm: "fmv.x.h", "%rd, %frs1";
  }
}

slot riscv64_zfh_min: riscv_zfh_min {
  includes {
    #include "riscv/riscv_i_instructions.h"
    #include "riscv/riscv_zfh_instructions.h"
  }
  default size = 4;
  default latency = 0;
  default opcode =
    disasm: "Unimplemented instruction at 0x%(@:08x)",
    semfunc: "&RV32VUnimplementedInstruction";
  opcodes {
    flh{(: rs1, I_imm12 : ), (: : frd)},
      resources: {next_pc, rs1 : frd[0..]},
      semfunc: "&RV64::RiscVILhu", "&RV64::RiscVZfhFlhChild",
      disasm: "flh", "%frd, %I_imm12(%rs1)";
    fsh{: rs1, S_imm12, frs2},
      resources: {next_pc, rs1, frs2},
      semfunc: "&RV64::RiscVISh",
      disasm: "fsh", "%frs2, %S_imm12(%rs1)";
    fmv_xh{: frs1 : rd},
      resources: {next_pc, frs1 : rd[0..]},
      semfunc: "&RV64::RiscVZfhFMvxh",
      disasm: "fmv.x.h", "%rd, %frs1";
  }
}

slot riscv32_zfh : riscv32_zfh_min {
  includes {
    #include "riscv/riscv_zfh_instructions.h"
  }
  default size = 4;
  default latency = 0;
  default opcode =
    disasm: "Unimplemented instruction at 0x%(@:08x)",
    semfunc: "&RV32VUnimplementedInstruction";
  opcodes {
    fadd_h{: frs1, frs2, rm : frd, fflags},
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFadd",
      disasm: "fadd.h", "%frd, %frs1, %frs2";
    fsub_h{: frs1, frs2, rm : frd, fflags},
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFsub",
      disasm: "fsub.h", "%frd, %frs1, %frs2";
    fmul_h{: frs1, frs2, rm : frd, fflags},
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFmul",
      disasm: "fmul.h", "%frd, %frs1, %frs2";
    fdiv_h{: frs1, frs2, rm : frd, fflags},
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFdiv",
      disasm: "fdiv.h", "%frd, %frs1, %frs2";
    fmin_h{: frs1, frs2, rm : frd, fflags},
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFmin",
      disasm: "fmin.h", "%frd, %frs1, %frs2";
    fmax_h{: frs1, frs2, rm : frd, fflags},
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFmax",
      disasm: "fmax.h", "%frd, %frs1, %frs2";
    fsgnj_h{: frs1, frs2 : frd },
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFsgnj",
      disasm: "fsgnj.h", "%frd, %frs1, %frs2";
    fsgnjn_h{: frs1, frs2 : frd },
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFsgnjn",
      disasm: "fsgnjn.h", "%frd, %frs1, %frs2";
    fsgnjx_h{: frs1, frs2 : frd },
      resources: {next_pc, frs1, frs2 : frd[0..]},
      semfunc: "&RiscVZfhFsgnjx",
      disasm: "fsgnjnx.h", "%frd, %frs1, %frs2";
  }
}