/* AXPbox Alpha Emulator
 * Copyright (C) 2020 Tomáš Glozar
 * Website: https://github.com/lenticularis39/axpbox
 *
 * Forked from: ES40 emulator
 * Copyright (C) 2007-2008 by the ES40 Emulator Project
 * Copyright (C) 2007 by Camiel Vanderhoeven
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * Although this is not required, the author would appreciate being notified of,
 * and receiving any modifications you may make to the source code that might
 * serve the general public.
 */

/**
 * \file
 * Contains code macros for the processor control instructions.
 * Based on ARM chapter 4.3
 **/
#define DO_BEQ                                                                 \
  if (!state.r[REG_1])                                                         \
    add_pc(DISP_21 * 4);

#define DO_BGE                                                                 \
  if ((s64)state.r[REG_1] >= 0)                                                \
    add_pc(DISP_21 * 4);

#define DO_BGT                                                                 \
  if ((s64)state.r[REG_1] > 0)                                                 \
    add_pc(DISP_21 * 4);

#define DO_BLBC                                                                \
  if (!(state.r[REG_1] & 1))                                                   \
    add_pc(DISP_21 * 4);

#define DO_BLBS                                                                \
  if (state.r[REG_1] & 1)                                                      \
    add_pc(DISP_21 * 4);

#define DO_BLE                                                                 \
  if ((s64)state.r[REG_1] <= 0)                                                \
    add_pc(DISP_21 * 4);

#define DO_BLT                                                                 \
  if ((s64)state.r[REG_1] < 0)                                                 \
    add_pc(DISP_21 * 4);

#define DO_BNE                                                                 \
  if (state.r[REG_1])                                                          \
    add_pc(DISP_21 * 4);

/* BR/BSR/JMP link store: per HRM 3.1.1, PC<1:0> read as zero — the
   architectural link value has both bits clear. ES40 uses pc<0> internally
   as a PALmode marker instead of a environment flag like other emulations
   It must be stripped when exposing PC as an integer in a GPR (PAL code,
   dispatch tables, and pointer arithmetic on the link expect a clean byte
   address). */
#define DO_BR                                                                  \
  {                                                                            \
    state.r[REG_1] = state.pc & ~U64(0x3);                                     \
    add_pc(DISP_21 * 4);                                                       \
  }

#define DO_BSR DO_BR

#define DO_JMP                                                                 \
  {                                                                            \
    temp_64 = state.r[REG_2] & ~U64(0x3);                                      \
    state.r[REG_1] = state.pc & ~U64(0x3);                                     \
    set_pc(temp_64 | (state.pc & 3));                                          \
  }

// JSR, RET and JSR_COROUTINE is really JMP, just with different prediction
// bits.
