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 the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 */ 20 21#if defined(SYSLIBC_SCCS) && !defined(lint) 22 .asciz "@(#)negf.s 1.2 (Berkeley) 02/17/89" 23#endif /* SYSLIBC_SCCS and not lint */ 24 25#include <tahoemath/fp.h> 26#include "DEFS.h" 27 28XENTRY(negf, 0) 29 clrl r1 30 andl3 $EXPMASK,4(fp),r0 /* check for reserved operand,zero. */ 31 beql isreserved 32 movl 4(fp),r0 /* fetch operand. */ 33 bbc $31,r0,seton 34 andl2 $(0!SIGNBIT),r0 /* turn it off. */ 35 ret 36seton: orl2 $SIGNBIT,r0 /* turn it on. */ 37 ret 38isreserved: 39 bbc $31,4(fp),retzero 40 callf $4,sfpresop 41 ret 42retzero: 43 clrl r0 44 ret 45