1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Ralph Campbell. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#include <machine/machAsmDefs.h> 38 39#if defined(LIBC_SCCS) && !defined(lint) 40 ASMSTR("from: @(#)modf.s 8.1 (Berkeley) 6/4/93") 41 ASMSTR("$Id: modf.S,v 1.3 1994/12/15 17:24:50 mycroft Exp $") 42#endif /* LIBC_SCCS and not lint */ 43 44/* 45 * double modf(val, iptr) 46 * double val, *iptr; 47 * returns: xxx and n (in *iptr) where val == n.xxx 48 */ 49LEAF(modf) 50 cfc1 t0, $31 # get the control register 51 cfc1 t0, $31 # get the control register 52 or t1, t0, 0x3 # set rounding mode to round to zero 53 xor t1, t1, 0x2 # (i.e., 01) 54 ctc1 t1, $31 55 cvt.w.d $f0, $f12 # convert val to integer 56 cvt.d.w $f0, $f0 # convert back to double 57 ctc1 t0, $31 # restore old rounding mode 58 s.d $f0, 0(a2) # save the integer part 59 sub.d $f0, $f12, $f0 # subtract val - integer part 60 j ra 61END(modf) 62