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 llroundf = __llroundf 32 #if defined(__sparcv9) || defined(__amd64) 33 #pragma weak lroundf = __llroundf 34 #pragma weak __lroundf = __llroundf 35 #endif 36 #endif 37 38 #include "libm.h" 39 40 long long 41 llroundf(float x) { 42 union { 43 unsigned i; 44 float f; 45 } xx; 46 unsigned hx, sx, i; 47 48 xx.f = x; 49 hx = xx.i & ~0x80000000; 50 sx = xx.i & 0x80000000; 51 52 if (hx < 0x4b000000) { /* |x| < 2^23 */ 53 /* handle |x| < 1 */ 54 if (hx < 0x3f800000) { 55 if (hx >= 0x3f000000) 56 return (sx ? -1LL : 1LL); 57 return (0LL); 58 } 59 60 /* round x at the integer bit */ 61 i = 1 << (0x95 - (hx >> 23)); 62 xx.i = (xx.i + i) & ~((i << 1) - 1); 63 64 /* 65 * on LP32 architectures, we can just convert x to a 32-bit 66 * integer and sign-extend it 67 */ 68 return ((long) xx.f); 69 } 70 71 /* now x is nan, inf, or integral */ 72 return ((long long) x); 73 } 74