usr/src/sys/tahoe/math/Knegf.s

/*      Knegf.s 1.3     86/01/05        */

#include "../tahoemath/fp.h"
#include "../tahoemath/Kfp.h"
#include "../tahoe/SYS.h"

        .text
ENTRY(Knegf, 0)
        clrl    r1
        andl3   $EXPMASK,4(fp),r0       /* check for reserved operand,zero. */
        beql    retzero
        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
retzero:
        clrl    r0
        ret