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Annotation of cci/usr/src/usr.lib/libF77/bit.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     "@(#)bit.c      1.1"
        !             3:  *
        !             4:  * bit set, clear, test routines
        !             5:  *
        !             6:  * calling sequences:
        !             7:  *     logical l, bit, state
        !             8:  *     call bis (bitnum, word)
        !             9:  *     call bic (bitnum, word)
        !            10:  *     call setbit (bitnum, word, state)
        !            11:  *     l = bit (bitnum, word)
        !            12:  * where:
        !            13:  *     bis(bic) sets(clears) bitnum in word
        !            14:  *     setbit sets bitnum in word to 1 if state is .true.
        !            15:  *     bit tests bitnum in word and returns a logical (t/f) value
        !            16:  */
        !            17: 
        !            18: long bis_(n, w)
        !            19: long *n, *w;
        !            20: {
        !            21: /* No parameter check needed; SHLL results 0 when n is out of range, */
        !            22: /*             and w|0 == w.                                        */
        !            23: /*     if (*n >= 0 && *n <= 31)                                     */
        !            24: 
        !            25:                *w |= (1L << (*n));
        !            26: }
        !            27: 
        !            28: long bic_(n, w)
        !            29: long *n, *w;
        !            30: {
        !            31: /* No parameter check needed; SHLL results 0 when n is out of range, */
        !            32: /*             and w|~0 == w.                                       */
        !            33: /*     if (*n >= 0 && *n <= 31)                                     */
        !            34: 
        !            35:                *w &= ~(1L << (*n));
        !            36: }
        !            37: 
        !            38: long bit_(n, w)
        !            39: long *n, *w;
        !            40: {
        !            41: /*
        !            42:        if (*n < 0 || *n > 31)
        !            43:                return(0);
        !            44:        return((*w & (1L << (*n))) != 0);
        !            45: */
        !            46: asm("  clrl    r0");
        !            47: asm("  tstl    *4(fp)");
        !            48: asm("  jlss    out");
        !            49: asm("  cmpl    *4(fp),$31");
        !            50: asm("  jgtr    out");
        !            51: asm("  jbc     *4(fp),*8(fp),out");
        !            52: asm("  movl    $1,r0");
        !            53: asm("out:      ret");
        !            54: }
        !            55: 
        !            56: setbit_(n, w, s)
        !            57: long *n, *w, *s;
        !            58: {
        !            59:        if (*s)
        !            60: /* Skip the call               */
        !            61: /*             bis_(n, w);     */
        !            62: 
        !            63:                *w |= (1L << (*n));
        !            64:        else
        !            65: /* Skip the call               */
        !            66: /*             bic_(n, w);     */
        !            67: 
        !            68:                *w &= ~(1L << (*n));
        !            69: }

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