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 __lrintf = lrintf 31 32 #include <sys/isa_defs.h> /* _ILP32 */ 33 #include "libm.h" 34 35 #if defined(_ILP32) 36 long 37 lrintf(float x) { 38 /* 39 * Note: The following code works on x86 (in the default rounding 40 * precision mode), but one should just use the fistpl instruction 41 * instead. 42 */ 43 union { 44 unsigned i; 45 float f; 46 } xx, yy; 47 unsigned hx; 48 49 xx.f = x; 50 hx = xx.i & ~0x80000000; 51 if (hx < 0x4b000000) { /* |x| < 2^23 */ 52 /* add and subtract a power of two to round x to an integer */ 53 #if defined(__sparc) 54 yy.i = (xx.i & 0x80000000) | 0x4b000000; 55 #elif defined(__x86) 56 /* assume 64-bit precision */ 57 yy.i = (xx.i & 0x80000000) | 0x5f000000; 58 #else 59 #error Unknown architecture 60 #endif 61 x = (x + yy.f) - yy.f; 62 return ((long) x); 63 } 64 65 /* now x is nan, inf, or integral */ 66 return ((long) x); 67 } 68 #else 69 #error Unsupported architecture 70 #endif /* defined(_ILP32) */ 71