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Annotation of 43BSDReno/lib/libc/tahoe/fpe/negd.s, revision 1.1.1.1

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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