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 #if defined(ELFOBJ) 31 #pragma weak modff = __modff 32 #pragma weak _modff = __modff 33 #endif 34 35 #include "libm.h" 36 37 float 38 __modff(float x, float *iptr) { 39 union { 40 unsigned i; 41 float f; 42 } xx, yy; 43 unsigned hx, s; 44 45 xx.f = x; 46 hx = xx.i & ~0x80000000; 47 48 if (hx >= 0x4b000000) { /* x is NaN, infinite, or integral */ 49 *iptr = x; 50 if (hx <= 0x7f800000) 51 xx.i &= 0x80000000; 52 return (xx.f); 53 } 54 55 if (hx < 0x3f800000) { /* |x| < 1 */ 56 xx.i &= 0x80000000; 57 *iptr = xx.f; 58 return (x); 59 } 60 61 /* split x at the binary point */ 62 s = xx.i & 0x80000000; 63 yy.i = xx.i & ~((1 << (0x96 - (hx >> 23))) - 1); 64 *iptr = yy.f; 65 xx.f -= yy.f; 66 xx.i = (xx.i & ~0x80000000) | s; 67 /* restore sign in case difference is 0 */ 68 return (xx.f); 69 } 70