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 __llrintf = llrintf 31 #if defined(__sparcv9) || defined(__amd64) 32 #pragma weak lrintf = llrintf 33 #pragma weak __lrintf = llrintf 34 #endif 35 36 #include "libm.h" 37 38 long long 39 llrintf(float x) { 40 /* 41 * Note: The following code works on x86 (in the default rounding 42 * precision mode), but one should just use the fistpll instruction 43 * instead. 44 */ 45 union { 46 unsigned i; 47 float f; 48 } xx, yy; 49 unsigned hx; 50 51 xx.f = x; 52 hx = xx.i & ~0x80000000; 53 54 if (hx < 0x4b000000) { /* |x| < 2^23 */ 55 /* add and subtract a power of two to round x to an integer */ 56 #if defined(__sparc) || defined(__amd64) 57 yy.i = (xx.i & 0x80000000) | 0x4b000000; 58 #elif defined(__i386) 59 /* assume 64-bit precision */ 60 yy.i = (xx.i & 0x80000000) | 0x5f000000; 61 #else 62 #error Unknown architecture 63 #endif 64 x = (x + yy.f) - yy.f; 65 66 /* 67 * on LP32 architectures, we can just convert x to a 32-bit 68 * integer and sign-extend it 69 */ 70 return ((long) x); 71 } 72 73 /* now x is nan, inf, or integral */ 74 return ((long long) x); 75 } 76