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 __lroundf = lroundf 31 32 #include <sys/isa_defs.h> /* _ILP32 */ 33 #include "libm.h" 34 35 #if defined(_ILP32) 36 long 37 lroundf(float x) { 38 union { 39 unsigned i; 40 float f; 41 } xx; 42 unsigned hx, sx, i; 43 44 xx.f = x; 45 hx = xx.i & ~0x80000000; 46 sx = xx.i & 0x80000000; 47 if (hx < 0x4b000000) { /* |x| < 2^23 */ 48 if (hx < 0x3f800000) { /* |x| < 1 */ 49 if (hx >= 0x3f000000) 50 return (sx ? -1L : 1L); 51 return (0L); 52 } 53 54 /* round x at the integer bit */ 55 i = 1 << (0x95 - (hx >> 23)); 56 xx.i = (xx.i + i) & ~((i << 1) - 1); 57 return ((long) xx.f); 58 } 59 60 /* now x is nan, inf, or integral */ 61 return ((long) x); 62 } 63 #else 64 #error Unsupported architecture 65 #endif /* defined(_ILP32) */ 66