/*
 * Copyright (c) 2012-2015 Etnaviv Project
 *
 * SPDX-License-Identifier: MIT
 *
 * Authors:
 *    Wladimir J. van der Laan <laanwj@gmail.com>
 */

#pragma once

#include <stdbool.h>
#include <stdint.h>

#include "etnaviv/isa/enums.h"

/* Number of source operands per instruction */
#define ETNA_NUM_SRC (3)

#define SWIZ_X(x) (((x) & 0x03) << 0)
#define SWIZ_Y(y) (((y) & 0x03) << 2)
#define SWIZ_Z(z) (((z) & 0x03) << 4)
#define SWIZ_W(w) (((w) & 0x03) << 6)

/* clang-format off */
/* Broadcast swizzle to all four components */
#define INST_SWIZ_BROADCAST(x) \
        (SWIZ_X(x) | SWIZ_Y(x) | SWIZ_Z(x) | SWIZ_W(x))
/* Identity (NOP) swizzle */
#define INST_SWIZ_IDENTITY \
        (SWIZ_X(0) | SWIZ_Y(1) | SWIZ_Z(2) | SWIZ_W(3))
/* Fully specified swizzle */
#define INST_SWIZ(x, y, z, w) \
        (SWIZ_X(x) | SWIZ_Y(y) | SWIZ_Z(z) | SWIZ_W(w))
#define SWIZZLE(c0, c1, c2, c3) \
        INST_SWIZ(ISA_SWIZ_##c0, \
                  ISA_SWIZ_##c1, \
                  ISA_SWIZ_##c2, \
                  ISA_SWIZ_##c3)
/* clang-format on */

/*** operands ***/

/* destination operand */
struct etna_inst_dst {
   unsigned use                       : 1; /* 0: not in use, 1: in use */
   enum isa_reg_addressing_mode amode : 3;
   unsigned reg                       : 7; /* register number 0..127 */
   enum isa_wrmask write_mask         : 4;
};

/* texture operand */
struct etna_inst_tex {
   unsigned id                        : 5; /* sampler id */
   enum isa_reg_addressing_mode amode : 3;
   unsigned swiz                      : 8; /* INST_SWIZ */
};

/* source operand */
struct etna_inst_src {
   unsigned use              : 1; /* 0: not in use, 1: in use */
   enum isa_reg_group rgroup : 3;
   union {
      struct __attribute__((__packed__)) {
         unsigned reg                       : 9; /* register or uniform number 0..511 */
         unsigned swiz                      : 8; /* INST_SWIZ */
         unsigned neg                       : 1; /* negate (flip sign) if set */
         unsigned abs                       : 1; /* absolute (remove sign) if set */
         enum isa_reg_addressing_mode amode : 3;
      };
      struct __attribute__((__packed__)) {
         unsigned imm_val  : 20;
         unsigned imm_type : 2;
      };
   };
};

/*** instruction ***/
struct etna_inst {
   enum isa_opc opcode;
   enum isa_type type;
   enum isa_rounding rounding;
   enum isa_cond cond     : 5;
   unsigned sat           : 1; /* saturate result between 0..1 */
   enum isa_thread thread : 2; /* select low/high half mediump */
   unsigned dst_full      : 1; /* write to highp register */
   unsigned pmode         : 1;
   unsigned skphp         : 1;
   unsigned denorm        : 1;
   unsigned local         : 1;
   unsigned left_shift    : 3;
   struct etna_inst_dst dst;               /* destination operand */
   struct etna_inst_tex tex;               /* texture operand */
   struct etna_inst_src src[ETNA_NUM_SRC]; /* source operand */
   unsigned imm;                           /* takes place of src[2] for BRANCH/CALL */
};

struct etna_asm_result {
   struct etna_inst *instr;
   char *error;
   size_t num_instr;
   size_t capacity_instr;
   bool success;
};