/* 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 floating-point branch instructions.
 * Based on ARM chapter 4.9.
 **/
#define FP_IS_ZERO(val) (((val) & ~FPR_SIGN) == 0)
#define FP_IS_NEGATIVE(val) (((val)&FPR_SIGN) != 0)

// Branch if equal to zero (+0 or -0)
#define DO_FBEQ                                                                \
  FPSTART;                                                                     \
  if (FP_IS_ZERO(state.f[FREG_1]))                                             \
    add_pc(DISP_21 * 4);

// Branch if >= 0 (positive or zero, including -0)
#define DO_FBGE                                                                \
  FPSTART;                                                                     \
  if (!FP_IS_NEGATIVE(state.f[FREG_1]) || FP_IS_ZERO(state.f[FREG_1]))         \
    add_pc(DISP_21 * 4);

// Branch if > 0 (positive and non-zero)
#define DO_FBGT                                                                \
  FPSTART;                                                                     \
  if (!FP_IS_NEGATIVE(state.f[FREG_1]) && !FP_IS_ZERO(state.f[FREG_1]))        \
    add_pc(DISP_21 * 4);

// Branch if <= 0 (negative or zero)
#define DO_FBLE                                                                \
  FPSTART;                                                                     \
  if (FP_IS_NEGATIVE(state.f[FREG_1]) || FP_IS_ZERO(state.f[FREG_1]))          \
    add_pc(DISP_21 * 4);

// Branch if < 0 (negative and non-zero)
#define DO_FBLT                                                                \
  FPSTART;                                                                     \
  if (FP_IS_NEGATIVE(state.f[FREG_1]) && !FP_IS_ZERO(state.f[FREG_1]))         \
    add_pc(DISP_21 * 4);

// Branch if not equal to zero
#define DO_FBNE                                                                \
  FPSTART;                                                                     \
  if (!FP_IS_ZERO(state.f[FREG_1]))                                            \
    add_pc(DISP_21 * 4);
