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 llroundl = __llroundl 32 #if defined(__sparcv9) || defined(__amd64) 33 #pragma weak lroundl = __llroundl 34 #pragma weak __lroundl = __llroundl 35 #endif 36 #endif 37 38 #include "libm.h" 39 40 #if defined(__sparc) 41 long long 42 llroundl(long double x) { 43 union { 44 unsigned i[4]; 45 long double q; 46 } xx; 47 union { 48 unsigned i[2]; 49 long long l; 50 } zz; 51 union { 52 unsigned i; 53 float f; 54 } tt; 55 unsigned hx, sx, frac; 56 int j; 57 58 xx.q = x; 59 sx = xx.i[0] & 0x80000000; 60 hx = xx.i[0] & ~0x80000000; 61 62 /* handle trivial cases */ 63 if (hx > 0x403e0000) { /* |x| > 2^63 + ... or x is nan */ 64 /* convert an out-of-range float */ 65 tt.i = sx | 0x7f000000; 66 return ((long long) tt.f); 67 } 68 69 /* handle |x| < 1 */ 70 if (hx < 0x3fff0000) { 71 if (hx >= 0x3ffe0000) 72 return (sx ? -1LL : 1LL); 73 return (0LL); 74 } 75 76 /* extract the integer and fractional parts of x */ 77 j = 0x406f - (hx >> 16); 78 xx.i[0] = 0x10000 | (xx.i[0] & 0xffff); 79 if (j >= 96) { 80 zz.i[0] = 0; 81 zz.i[1] = xx.i[0] >> (j - 96); 82 frac = ((xx.i[0] << 1) << (127 - j)) | (xx.i[1] >> (j - 96)); 83 if (((xx.i[1] << 1) << (127 - j)) | xx.i[2] | xx.i[3]) 84 frac |= 1; 85 } else if (j >= 64) { 86 zz.i[0] = xx.i[0] >> (j - 64); 87 zz.i[1] = ((xx.i[0] << 1) << (95 - j)) | (xx.i[1] >> (j - 64)); 88 frac = ((xx.i[1] << 1) << (95 - j)) | (xx.i[2] >> (j - 64)); 89 if (((xx.i[2] << 1) << (95 - j)) | xx.i[3]) 90 frac |= 1; 91 } else { 92 zz.i[0] = ((xx.i[0] << 1) << (63 - j)) | (xx.i[1] >> (j - 32)); 93 zz.i[1] = ((xx.i[1] << 1) << (63 - j)) | (xx.i[2] >> (j - 32)); 94 frac = ((xx.i[2] << 1) << (63 - j)) | (xx.i[3] >> (j - 32)); 95 if ((xx.i[3] << 1) << (63 - j)) 96 frac |= 1; 97 } 98 99 /* round */ 100 if (frac >= 0x80000000u) { 101 if (++zz.i[1] == 0) 102 zz.i[0]++; 103 } 104 105 /* check for result out of range (note that z is |x| at this point) */ 106 if (zz.i[0] > 0x80000000u || (zz.i[0] == 0x80000000 && (zz.i[1] || 107 !sx))) { 108 tt.i = sx | 0x7f000000; 109 return ((long long) tt.f); 110 } 111 112 /* negate result if need be */ 113 if (sx) { 114 zz.i[0] = ~zz.i[0]; 115 zz.i[1] = -zz.i[1]; 116 if (zz.i[1] == 0) 117 zz.i[0]++; 118 } 119 120 return (zz.l); 121 } 122 #elif defined(__x86) 123 long long 124 llroundl(long double x) { 125 union { 126 unsigned i[3]; 127 long double e; 128 } xx; 129 int ex, sx, i; 130 131 xx.e = x; 132 ex = xx.i[2] & 0x7fff; 133 sx = xx.i[2] & 0x8000; 134 135 if (ex < 0x403e) { /* |x| < 2^63 */ 136 /* handle |x| < 1 */ 137 if (ex < 0x3fff) { 138 if (ex >= 0x3ffe) 139 return (sx ? -1LL : 1LL); 140 return (0LL); 141 } 142 143 /* round x at the integer bit */ 144 if (ex < 0x401e) { 145 i = 1 << (0x401d - ex); 146 xx.i[1] = (xx.i[1] + i) & ~(i | (i - 1)); 147 xx.i[0] = 0; 148 } else { 149 i = 1 << (0x403d - ex); 150 xx.i[0] += i; 151 if (xx.i[0] < i) 152 xx.i[1]++; 153 xx.i[0] &= ~(i | (i - 1)); 154 } 155 if (xx.i[1] == 0) { 156 xx.i[2] = sx | ++ex; 157 xx.i[1] = 0x80000000U; 158 } 159 } 160 161 /* now x is nan, inf, or integral */ 162 return ((long long) xx.e); 163 } 164 #else 165 #error Unknown architecture 166 #endif 167