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 lrintf = __lrintf 32 #endif 33 34 #include <sys/isa_defs.h> /* _ILP32 */ 35 #include "libm.h" 36 37 #if defined(_ILP32) 38 long 39 lrintf(float x) { 40 /* 41 * Note: The following code works on x86 (in the default rounding 42 * precision mode), but one should just use the fistpl 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 if (hx < 0x4b000000) { /* |x| < 2^23 */ 54 /* add and subtract a power of two to round x to an integer */ 55 #if defined(__sparc) 56 yy.i = (xx.i & 0x80000000) | 0x4b000000; 57 #elif defined(__x86) 58 /* assume 64-bit precision */ 59 yy.i = (xx.i & 0x80000000) | 0x5f000000; 60 #else 61 #error Unknown architecture 62 #endif 63 x = (x + yy.f) - yy.f; 64 return ((long) x); 65 } 66 67 /* now x is nan, inf, or integral */ 68 return ((long) x); 69 } 70 #else 71 #error Unsupported architecture 72 #endif /* defined(_ILP32) */ 73