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Annotation of uae/src/md-amiga/m68k.h, revision 1.1.1.1

1.1       root        1:  /* 
                      2:   * UAE - The Un*x Amiga Emulator
                      3:   * 
                      4:   * MC68000 emulation - machine dependent bits
                      5:   *
                      6:   * Copyright 1996 Bernd Schmidt, Samuel Devulder
                      7:   */
                      8: 
                      9:  
                     10: struct flag_struct {
                     11:     /* tricky: be sure that bit-offset(x)=bit-offset(c) in word representation. */
                     12:     /* This depends heavily on the bit-order and the compiler used. I am not    */
                     13:     /* sure the generated code is better than uae-0.6.1 */
                     14:     int :12;           /* First word */
                     15:     unsigned int n:1;
                     16:     unsigned int z:1;
                     17:     unsigned int v:1;
                     18:     unsigned int c:1;
                     19:     
                     20:     int :15;           /* Second word */
                     21:     unsigned int x:1;
                     22: };
                     23: 
                     24: extern struct flag_struct regflags;
                     25: 
                     26: #define ZFLG (regflags.z)
                     27: #define NFLG (regflags.n)
                     28: #define CFLG (regflags.c)
                     29: #define VFLG (regflags.v)
                     30: #define XFLG (regflags.x)
                     31: 
                     32: static __inline__ int cctrue(const int cc)
                     33: {
                     34:     switch(cc){
                     35:      case 0: return 1;                       /* T */
                     36:      case 1: return 0;                       /* F */
                     37:      case 2: return !CFLG && !ZFLG;          /* HI */
                     38:      case 3: return CFLG || ZFLG;            /* LS */
                     39:      case 4: return !CFLG;                   /* CC */
                     40:      case 5: return CFLG;                    /* CS */
                     41:      case 6: return !ZFLG;                   /* NE */
                     42:      case 7: return ZFLG;                    /* EQ */
                     43:      case 8: return !VFLG;                   /* VC */
                     44:      case 9: return VFLG;                    /* VS */
                     45:      case 10:return !NFLG;                   /* PL */
                     46:      case 11:return NFLG;                    /* MI */
                     47:      case 12:return NFLG == VFLG;            /* GE */
                     48:      case 13:return NFLG != VFLG;            /* LT */
                     49:      case 14:return !ZFLG && (NFLG == VFLG); /* GT */
                     50:      case 15:return ZFLG || (NFLG != VFLG);  /* LE */
                     51:     }
                     52:     abort();
                     53:     return 0;
                     54: }
                     55: 

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