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Annotation of 43BSDReno/lib/libc/i386/gen/modf.c, revision 1.1.1.1

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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