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 lroundl = __lroundl 31 32 #include <sys/isa_defs.h> /* _ILP32 */ 33 #include "libm.h" 34 35 #if defined(_ILP32) 36 #if defined(__sparc) 37 long 38 lroundl(long double x) { 39 union { 40 unsigned i[4]; 41 long double q; 42 } xx; 43 union { 44 unsigned i; 45 float f; 46 } tt; 47 unsigned hx, sx, frac, l; 48 int j; 49 50 xx.q = x; 51 sx = xx.i[0] & 0x80000000; 52 hx = xx.i[0] & ~0x80000000; 53 54 /* handle trivial cases */ 55 if (hx > 0x401e0000) { /* |x| > 2^31 + ... or x is nan */ 56 /* convert an out-of-range float */ 57 tt.i = sx | 0x7f000000; 58 return ((long) tt.f); 59 } 60 61 /* handle |x| < 1 */ 62 if (hx < 0x3fff0000) { 63 if (hx >= 0x3ffe0000) 64 return (sx ? -1L : 1L); 65 return (0L); 66 } 67 68 /* extract the integer and fractional parts of x */ 69 j = 0x406f - (hx >> 16); /* 91 <= j <= 112 */ 70 xx.i[0] = 0x10000 | (xx.i[0] & 0xffff); 71 if (j >= 96) { /* 96 <= j <= 112 */ 72 l = xx.i[0] >> (j - 96); 73 frac = ((xx.i[0] << 1) << (127 - j)) | (xx.i[1] >> (j - 96)); 74 if (((xx.i[1] << 1) << (127 - j)) | xx.i[2] | xx.i[3]) 75 frac |= 1; 76 } else { /* 91 <= j <= 95 */ 77 l = (xx.i[0] << (96 - j)) | (xx.i[1] >> (j - 64)); 78 frac = (xx.i[1] << (96 - j)) | (xx.i[2] >> (j - 64)); 79 if ((xx.i[2] << (96 - j)) | xx.i[3]) 80 frac |= 1; 81 } 82 83 /* round */ 84 if (frac >= 0x80000000U) 85 l++; 86 87 /* check for result out of range (note that z is |x| at this point) */ 88 if (l > 0x80000000U || (l == 0x80000000U && !sx)) { 89 tt.i = sx | 0x7f000000; 90 return ((long) tt.f); 91 } 92 93 /* negate result if need be */ 94 if (sx) 95 l = -l; 96 return ((long) l); 97 } 98 #elif defined(__x86) 99 long 100 lroundl(long double x) { 101 union { 102 unsigned i[3]; 103 long double e; 104 } xx; 105 int ex, sx, i; 106 107 xx.e = x; 108 ex = xx.i[2] & 0x7fff; 109 sx = xx.i[2] & 0x8000; 110 if (ex < 0x403e) { /* |x| < 2^63 */ 111 if (ex < 0x3fff) { /* |x| < 1 */ 112 if (ex >= 0x3ffe) 113 return (sx ? -1L : 1L); 114 return (0L); 115 } 116 117 /* round x at the integer bit */ 118 if (ex < 0x401e) { 119 i = 1 << (0x401d - ex); 120 xx.i[1] = (xx.i[1] + i) & ~(i | (i - 1)); 121 xx.i[0] = 0; 122 } else { 123 i = 1 << (0x403d - ex); 124 xx.i[0] += i; 125 if (xx.i[0] < i) 126 xx.i[1]++; 127 xx.i[0] &= ~(i | (i - 1)); 128 } 129 if (xx.i[1] == 0) { 130 xx.i[2] = sx | ++ex; 131 xx.i[1] = 0x80000000U; 132 } 133 } 134 135 /* now x is nan, inf, or integral */ 136 return ((long) xx.e); 137 } 138 #else 139 #error Unknown architecture 140 #endif /* defined(__sparc) || defined(__x86) */ 141 #else 142 #error Unsupported architecture 143 #endif /* defined(_ILP32) */ 144