mpact/sim/decoder/test/push_pop.bin_fmt

// Copyright 2024 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 defines the push and pop instructions for a test ISA to test
// "array" or "list" operands.

decoder PushPopInst {
  namespace mpact::sim::decoder::test;
  opcode_enum = "OpcodeEnum";
  includes {
    #include "mpact/sim/decoder/test/push_pop_inst_decoder.h"
  }
  PushPop;
}

format Inst16Format[16] {
  fields:
    unsigned func3[3];
    unsigned bits[11];
    unsigned op[2];
}

format PType[16] : Inst16Format {
  fields:
    unsigned func8[8];
    unsigned rlist[4];
    unsigned spimm[2];
    unsigned op[2];
  overlays:
    unsigned spimm6[6] = spimm, 0b0000;
}

instruction group PushPop[16] : Inst16Format {
  push : PType : func8 == 0b101'11000, rlist > 3, op == 0b10;
  pop  : PType : func8 == 0b101'11010, rlist > 3, op == 0b10;
}