1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma weak modff = __modff 31 #pragma weak _modff = __modff 32 33 #include "libm.h" 34 35 float 36 __modff(float x, float *iptr) { 37 union { 38 unsigned i; 39 float f; 40 } xx, yy; 41 unsigned hx, s; 42 43 xx.f = x; 44 hx = xx.i & ~0x80000000; 45 46 if (hx >= 0x4b000000) { /* x is NaN, infinite, or integral */ 47 *iptr = x; 48 if (hx <= 0x7f800000) 49 xx.i &= 0x80000000; 50 return (xx.f); 51 } 52 53 if (hx < 0x3f800000) { /* |x| < 1 */ 54 xx.i &= 0x80000000; 55 *iptr = xx.f; 56 return (x); 57 } 58 59 /* split x at the binary point */ 60 s = xx.i & 0x80000000; 61 yy.i = xx.i & ~((1 << (0x96 - (hx >> 23))) - 1); 62 *iptr = yy.f; 63 xx.f -= yy.f; 64 xx.i = (xx.i & ~0x80000000) | s; 65 /* restore sign in case difference is 0 */ 66 return (xx.f); 67 } 68