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 __lrintl = lrintl 31 32 #include <sys/isa_defs.h> /* _ILP32 */ 33 #include "libm.h" 34 35 #if defined(_ILP32) 36 #if defined(__sparc) 37 38 #include "fma.h" 39 #include "fenv_inlines.h" 40 41 long 42 lrintl(long double x) { 43 union { 44 unsigned int i[4]; 45 long double q; 46 } xx; 47 union { 48 unsigned int i; 49 float f; 50 } tt; 51 unsigned int hx, sx, frac, l, fsr; 52 int rm, j; 53 volatile float dummy; 54 55 xx.q = x; 56 sx = xx.i[0] & 0x80000000; 57 hx = xx.i[0] & ~0x80000000; 58 59 /* handle trivial cases */ 60 if (hx > 0x401e0000) { /* |x| > 2^31 + ... or x is nan */ 61 /* convert an out-of-range float */ 62 tt.i = sx | 0x7f000000; 63 return ((long) tt.f); 64 } else if ((hx | xx.i[1] | xx.i[2] | xx.i[3]) == 0) /* x is zero */ 65 return (0L); 66 67 /* get the rounding mode */ 68 __fenv_getfsr32(&fsr); 69 rm = fsr >> 30; 70 71 /* flip the sense of directed roundings if x is negative */ 72 if (sx) 73 rm ^= rm >> 1; 74 75 /* handle |x| < 1 */ 76 if (hx < 0x3fff0000) { 77 dummy = 1.0e30F; /* x is nonzero, so raise inexact */ 78 dummy += 1.0e-30F; 79 if (rm == FSR_RP || (rm == FSR_RN && (hx >= 0x3ffe0000 && 80 ((hx & 0xffff) | xx.i[1] | xx.i[2] | xx.i[3])))) 81 return (sx ? -1L : 1L); 82 return (0L); 83 } 84 85 /* extract the integer and fractional parts of x */ 86 j = 0x406f - (hx >> 16); /* 91 <= j <= 112 */ 87 xx.i[0] = 0x10000 | (xx.i[0] & 0xffff); 88 if (j >= 96) { /* 96 <= j <= 112 */ 89 l = xx.i[0] >> (j - 96); 90 frac = ((xx.i[0] << 1) << (127 - j)) | (xx.i[1] >> (j - 96)); 91 if (((xx.i[1] << 1) << (127 - j)) | xx.i[2] | xx.i[3]) 92 frac |= 1; 93 } else { /* 91 <= j <= 95 */ 94 l = (xx.i[0] << (96 - j)) | (xx.i[1] >> (j - 64)); 95 frac = (xx.i[1] << (96 - j)) | (xx.i[2] >> (j - 64)); 96 if ((xx.i[2] << (96 - j)) | xx.i[3]) 97 frac |= 1; 98 } 99 100 /* round */ 101 if (frac && (rm == FSR_RP || (rm == FSR_RN && (frac > 0x80000000U || 102 (frac == 0x80000000 && (l & 1)))))) 103 l++; 104 105 /* check for result out of range (note that z is |x| at this point) */ 106 if (l > 0x80000000U || (l == 0x80000000U && !sx)) { 107 tt.i = sx | 0x7f000000; 108 return ((long) tt.f); 109 } 110 111 /* raise inexact if need be */ 112 if (frac) { 113 dummy = 1.0e30F; 114 dummy += 1.0e-30F; 115 } 116 117 /* negate result if need be */ 118 if (sx) 119 l = -l; 120 return ((long) l); 121 } 122 #elif defined(__x86) 123 long 124 lrintl(long double x) { 125 /* 126 * Note: The following code works on x86 (in the default rounding 127 * precision mode), but one ought to just use the fistpl instruction 128 * instead. 129 */ 130 union { 131 unsigned i[3]; 132 long double e; 133 } xx, yy; 134 int ex; 135 136 xx.e = x; 137 ex = xx.i[2] & 0x7fff; 138 if (ex < 0x403e) { /* |x| < 2^63 */ 139 /* add and subtract a power of two to round x to an integer */ 140 yy.i[2] = (xx.i[2] & 0x8000) | 0x403e; 141 yy.i[1] = 0x80000000; 142 yy.i[0] = 0; 143 x = (x + yy.e) - yy.e; 144 } 145 146 /* now x is nan, inf, or integral */ 147 return ((long) x); 148 } 149 #else 150 #error Unknown architecture 151 #endif /* defined(__sparc) || defined(__x86) */ 152 #else 153 #error Unsupported architecture 154 #endif /* defined(_ILP32) */ 155