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Annotation of 43BSDReno/lib/libc/tahoe/fpe/negd.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Computer Consoles Inc.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted
        !             9:  * provided that: (1) source distributions retain this entire copyright
        !            10:  * notice and comment, and (2) distributions including binaries display
        !            11:  * the following acknowledgement:  ``This product includes software
        !            12:  * developed by the University of California, Berkeley and its contributors''
        !            13:  * in the documentation or other materials provided with the distribution
        !            14:  * and in all advertising materials mentioning features or use of this
        !            15:  * software. Neither the name of the University nor the names of its
        !            16:  * contributors may be used to endorse or promote products derived
        !            17:  * from this software without specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #if defined(SYSLIBC_SCCS) && !defined(lint)
        !            24:        .asciz "@(#)negd.s      1.3 (Berkeley) 6/1/90"
        !            25: #endif /* SYSLIBC_SCCS and not lint */
        !            26: 
        !            27: #include <tahoemath/fp.h>
        !            28: #include "DEFS.h"
        !            29: 
        !            30: XENTRY(negd, 0)
        !            31:        andl3   $EXPMASK,4(fp),r0       /* check for reserved operand,zero. */
        !            32:        beql    isreserved
        !            33:        movl    4(fp),r0                /* fetch operand. */
        !            34:        movl    8(fp),r1
        !            35:        bbc     $31,r0,seton
        !            36:        andl2   $(0!SIGNBIT),r0         /* turn it off. */
        !            37:        ret
        !            38: seton: orl2    $SIGNBIT,r0             /* turn it on. */
        !            39:        ret
        !            40: isreserved:
        !            41:        bbc     $31,4(fp),retzero
        !            42:        callf   $4,fpresop
        !            43:        ret
        !            44: retzero:
        !            45:        clrl    r0
        !            46:        clrl    r1
        !            47:        ret

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