usr/src/lib/libc/tahoe/fpe/negf.s

#ifdef LIBC_SCCS
        .asciz  "@(#)negf.s     1.1 (Berkeley/CCI) %G%"
#endif LIBC_SCCS

#include <tahoemath/fp.h>
#include "DEFS.h"

XENTRY(negf, 0)
        clrl    r1
        andl3   $EXPMASK,4(fp),r0       /* check for reserved operand,zero. */
        beql    isreserved
        movl    4(fp),r0                /* fetch operand. */
        bbc     $31,r0,seton
        andl2   $(0!SIGNBIT),r0         /* turn it off. */
        ret
seton:  orl2    $SIGNBIT,r0             /* turn it on. */
        ret
isreserved:
        bbc     $31,4(fp),retzero
        callf   $4,sfpresop
        ret
retzero:
        clrl    r0
        ret