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modf.S revision 1.1 
      1  1.1  glass /*-
      2  1.1  glass  * Copyright (c) 1991, 1993
      3  1.1  glass  *	The Regents of the University of California.  All rights reserved.
      4  1.1  glass  *
      5  1.1  glass  * This code is derived from software contributed to Berkeley by
      6  1.1  glass  * Ralph Campbell.
      7  1.1  glass  *
      8  1.1  glass  * Redistribution and use in source and binary forms, with or without
      9  1.1  glass  * modification, are permitted provided that the following conditions
     10  1.1  glass  * are met:
     11  1.1  glass  * 1. Redistributions of source code must retain the above copyright
     12  1.1  glass  *    notice, this list of conditions and the following disclaimer.
     13  1.1  glass  * 2. Redistributions in binary form must reproduce the above copyright
     14  1.1  glass  *    notice, this list of conditions and the following disclaimer in the
     15  1.1  glass  *    documentation and/or other materials provided with the distribution.
     16  1.1  glass  * 3. All advertising materials mentioning features or use of this software
     17  1.1  glass  *    must display the following acknowledgement:
     18  1.1  glass  *	This product includes software developed by the University of
     19  1.1  glass  *	California, Berkeley and its contributors.
     20  1.1  glass  * 4. Neither the name of the University nor the names of its contributors
     21  1.1  glass  *    may be used to endorse or promote products derived from this software
     22  1.1  glass  *    without specific prior written permission.
     23  1.1  glass  *
     24  1.1  glass  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  1.1  glass  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  1.1  glass  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  1.1  glass  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  1.1  glass  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  1.1  glass  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  1.1  glass  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  1.1  glass  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  1.1  glass  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  1.1  glass  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  1.1  glass  * SUCH DAMAGE.
     35  1.1  glass  */
     36  1.1  glass 
     37  1.1  glass #include <machine/machAsmDefs.h>
     38  1.1  glass 
     39  1.1  glass #if defined(LIBC_SCCS) && !defined(lint)
     40  1.1  glass 	ASMSTR("from: @(#)modf.s	8.1 (Berkeley) 6/4/93")
     41  1.1  glass 	ASMSTR("$Id: modf.S,v 1.1 1994/05/24 07:12:36 glass Exp $")
     42  1.1  glass #endif /* LIBC_SCCS and not lint */
     43  1.1  glass 
     44  1.1  glass /*
     45  1.1  glass  * double modf(val, iptr)
     46  1.1  glass  *	double val, *iptr;
     47  1.1  glass  * returns: xxx and n (in *iptr) where val == n.xxx
     48  1.1  glass  */
     49  1.1  glass LEAF(modf)
     50  1.1  glass 	cfc1	t0, $31			# get the control register
     51  1.1  glass 	cfc1	t0, $31			# get the control register
     52  1.1  glass 	or	t1, t0, 0x3		# set rounding mode to round to zero
     53  1.1  glass 	xor	t1, t1, 0x2		#  (i.e., 01)
     54  1.1  glass 	ctc1	t1, $31
     55  1.1  glass 	cvt.w.d	$f0, $f12		# convert val to integer
     56  1.1  glass 	cvt.d.w	$f0, $f0		# convert back to double
     57  1.1  glass 	ctc1	t0, $31			# restore old rounding mode
     58  1.1  glass 	s.d	$f0, 0(a2)		# save the integer part
     59  1.1  glass 	sub.d	$f0, $f12, $f0		# subtract val - integer part
     60  1.1  glass 	j	ra
     61  1.1  glass END(modf)
     62