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 __llroundf = llroundf 31 #if defined(__sparcv9) || defined(__amd64) 32 #pragma weak lroundf = llroundf 33 #pragma weak __lroundf = llroundf 34 #endif 35 36 #include "libm.h" 37 38 long long 39 llroundf(float x) { 40 union { 41 unsigned i; 42 float f; 43 } xx; 44 unsigned hx, sx, i; 45 46 xx.f = x; 47 hx = xx.i & ~0x80000000; 48 sx = xx.i & 0x80000000; 49 50 if (hx < 0x4b000000) { /* |x| < 2^23 */ 51 /* handle |x| < 1 */ 52 if (hx < 0x3f800000) { 53 if (hx >= 0x3f000000) 54 return (sx ? -1LL : 1LL); 55 return (0LL); 56 } 57 58 /* round x at the integer bit */ 59 i = 1 << (0x95 - (hx >> 23)); 60 xx.i = (xx.i + i) & ~((i << 1) - 1); 61 62 /* 63 * on LP32 architectures, we can just convert x to a 32-bit 64 * integer and sign-extend it 65 */ 66 return ((long) xx.f); 67 } 68 69 /* now x is nan, inf, or integral */ 70 return ((long long) x); 71 } 72