musix 0.3.5

/**
 * @ingroup   emu68_lib
 * @file      emu68/cc68.h
 * @author    Benjamin Gerard
 * @date      1999/03/13
 * @brief     Condition code header.
 *
 */

/* $Id: cc68.h 141 2011-08-07 23:30:20Z benjihan $ */

/* Copyright (C) 1998-2009 Benjamin Gerard */

#ifndef _EMU68_CC68_H_
#define _EMU68_CC68_H_

#include "emu68_api.h"
#include "srdef68.h"

/** @addtogroup   emu68_lib_core
 *  @{
 */

/** Code Conditions. */
enum {
  CC68_TR = 0x0,  CC68_FA = 0x1,  CC68_HI = 0x2,  CC68_LS = 0x3,
  CC68_CC = 0x4,  CC68_CS = 0x5,  CC68_NE = 0x6,  CC68_EQ = 0x7,
  CC68_VC = 0x8,  CC68_VS = 0x9,  CC68_PL = 0xA,  CC68_MI = 0xB,
  CC68_GE = 0xC,  CC68_LT = 0xD,  CC68_GT = 0xE,  CC68_LE = 0xF
};

/** @name  Condition tests.
 *
 *  Theses macros perform conditionnal tests depending on CCR value.
 *
 *  @return  1  condition true
 *  @return  0  condition false
 *  @{
 */

/** 0000 True.
 *  @param  sr  current SR value
 *  @retval always true
 */
static inline int inl_is_cc0(const int sr)
{
  return 1;
}

/** 0001 False.
 *  @param  sr  current SR value
 *  @return always false
 */
static inline int inl_is_cc1(const int sr)
{
  return 0;
}

/** 0010 High.
 *  @param  sr  current SR value
 *  @retval ¬(C|Z) <-> ¬C&¬Z
 */
static inline int inl_is_cc2(const int sr)
{
  return ~
    ( ( sr >> SR_C_BIT )
      |
      ( sr >> SR_Z_BIT )
      ) & 1;
}

/** 0011 Low or Same.
 *  @param  sr  current SR value
 *  @return (C|Z)
 */
static inline int inl_is_cc3(const int sr)
{
  return
    ( ( sr >> SR_C_BIT )
      |
      ( sr >> SR_Z_BIT )
      ) & 1;
}
/* #define IS_LS(SR) inl_is_cc3(SR) */

/** 0100 Carry Clear.
 *  @param  sr  current SR value
 *  @return ¬C
 */
static inline int inl_is_cc4(const int sr)
{
  return ~
    ( sr >> SR_C_BIT ) & 1;
}

/** 0101 Carry Set.
 *  @param  sr  current SR value
 *  @return C
 */
static inline int inl_is_cc5(const int sr)
{
  return
    ( sr >> SR_C_BIT ) & 1;
}

/** 0110 Not Equal (not zero).
 *  @param  sr  current SR value
 *  @return ¬Z
 */
static inline int inl_is_cc6(const int sr)
{
  return ~
    ( sr >> SR_Z_BIT ) & 1;
}

/** 0111 Equal (zero).
 *  @param  sr  current SR value
 *  @return Z
 */
static inline int inl_is_cc7(const int sr)
{
  return
    ( sr >> SR_Z_BIT ) & 1;
}
/* #define IS_EQ(SR) (  */

/** 1000 Overflow Clear.
 *  @param  sr  current SR value
 *  @return ¬V
 */
static inline int inl_is_cc8(const int sr)
{
  return ~
    ( sr >> SR_V_BIT ) & 1;
}

/** 1001 Overflow Set.
 *  @param  sr  current SR value
 *  @return V
 */
static inline int inl_is_cc9(const int sr)
{
  return
    ( sr >> SR_V_BIT ) & 1;
}

/** 1010 Plus.
 *  @param  sr  current SR value
 *  @return ¬N
 */
static inline int inl_is_ccA(const int sr)
{
  return ~
    ( sr >> SR_N_BIT ) & 1;
}

/** 1011 Minus.
 *  @param  sr  current SR value
 *  @return N
 */
static inline int inl_is_ccB(const int sr)
{
  return
    ( sr >> SR_N_BIT ) & 1;
}

/** 1100 Greater or Equal.
 *  @param  sr  current SR value
 *  @return ¬(N^V)
 */
static inline int inl_is_ccC(const int sr)
{
  return ~
    ( ( sr >> SR_N_BIT )
      ^
      ( sr >> SR_V_BIT )
      ) & 1;
}

/** 1101 Less Than.
 *  @param  sr  current SR value
 *  @return N^V
 */
static inline int inl_is_ccD(const int sr)
{
  return
    ( ( sr >> SR_N_BIT )
      ^
      ( sr >> SR_V_BIT )
      ) & 1;
}

/** 1110 Greater Than.
 *  @param  sr  current SR value
 *  @return ¬(Z|(N^V))
 */
static inline int inl_is_ccE(const int sr)
{
  return ~
    ( ( sr >> SR_Z_BIT )
      |
      ( ( sr >> SR_N_BIT )
        ^
        ( sr >> SR_V_BIT ) )
      ) & 1;
}

/** 1111 Less or Equal.
 *  @param  sr  current SR value
 *  @return (Z|(N^V))
 */
static inline int inl_is_ccF(const int sr)
{
  return
    ( ( sr >> SR_Z_BIT )
      |
      ( ( sr >> SR_N_BIT )
        ^
        ( sr >> SR_V_BIT ) )
      ) & 1;
}

/** @} */

/**
 *  @}
 */

#endif /* #ifndef _EMU68_CC68_H_ */