/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Computer Consoles Inc.
 *
 * %sccs.include.redist.c%
 */

#if defined(SYSLIBC_SCCS) && !defined(lint)
	.asciz "@(#)negf.s	1.3 (Berkeley) 06/01/90"
#endif /* SYSLIBC_SCCS and not lint */

#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