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Annotation of 43BSDReno/lib/libc/i386/gen/modf.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Sean Eric Fagan
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted
        !             9:  * provided that: (1) source distributions retain this entire copyright
        !            10:  * notice and comment, and (2) distributions including binaries display
        !            11:  * the following acknowledgement:  ``This product includes software
        !            12:  * developed by the University of California, Berkeley and its contributors''
        !            13:  * in the documentation or other materials provided with the distribution
        !            14:  * and in all advertising materials mentioning features or use of this
        !            15:  * software. Neither the name of the University nor the names of its
        !            16:  * contributors may be used to endorse or promote products derived
        !            17:  * from this software without specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24: static char sccsid[] = "@(#)modf.c     5.1 (Berkeley) 4/23/90";
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: /*
        !            28:  * modf(value, iptr): return fractional part of value, and stores the
        !            29:  * integral part into iptr (a pointer to double).
        !            30:  *
        !            31:  * Written by Sean Eric Fagan ([email protected])
        !            32:  * Sun Mar 11 20:27:30 PST 1990
        !            33:  */
        !            34: 
        !            35: /* With CHOP mode on, frndint behaves as TRUNC does.  Useful. */
        !            36: double
        !            37: modf(double value, double *iptr)
        !            38: {
        !            39:        double temp;
        !            40:        short i87flag, i87temp;
        !            41:        __asm ("fnstcw %0" : "=g" (i87flag) : );
        !            42:        i87temp = i87flag | 0xc00 ; /* turn on chop mode [truncation] */
        !            43:        __asm ("fldcw %0" : : "g" (i87temp));
        !            44:        __asm ("frndint" : "=f" (temp) : "0" (value)); /* temp = int of value */
        !            45:        __asm ("fldcw %0" : : "g" (i87flag));
        !            46:        *iptr = temp;
        !            47:        return (value - temp);
        !            48: }

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