1/* Round argument to nearest integral value according to current rounding 2 direction. 3 Copyright (C) 1997-2018 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and 6 Jakub Jelinek <jj@ultra.linux.cz>, 1999. 7 8 The GNU C Library is free software; you can redistribute it and/or 9 modify it under the terms of the GNU Lesser General Public 10 License as published by the Free Software Foundation; either 11 version 2.1 of the License, or (at your option) any later version. 12 13 The GNU C Library is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 Lesser General Public License for more details. 17 18 You should have received a copy of the GNU Lesser General Public 19 License along with the GNU C Library; if not, see 20 <http://www.gnu.org/licenses/>. */ 21 22#include "quadmath-imp.h" 23 24static const __float128 two112[2] = 25{ 26 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */ 27 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */ 28}; 29 30long long int 31llrintq (__float128 x) 32{ 33 int32_t j0; 34 uint64_t i0,i1; 35 __float128 w; 36 __float128 t; 37 long long int result; 38 int sx; 39 40 GET_FLT128_WORDS64 (i0, i1, x); 41 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; 42 sx = i0 >> 63; 43 i0 &= 0x0000ffffffffffffLL; 44 i0 |= 0x0001000000000000LL; 45 46 if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) 47 { 48#if defined FE_INVALID || defined FE_INEXACT 49 /* X < LLONG_MAX + 1 implied by J0 < 63. */ 50 if (x > (__float128) LLONG_MAX) 51 { 52 /* In the event of overflow we must raise the "invalid" 53 exception, but not "inexact". */ 54 t = nearbyintq (x); 55 feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID); 56 } 57 else 58#endif 59 { 60 w = two112[sx] + x; 61 t = w - two112[sx]; 62 } 63 GET_FLT128_WORDS64 (i0, i1, t); 64 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; 65 i0 &= 0x0000ffffffffffffLL; 66 i0 |= 0x0001000000000000LL; 67 68 if (j0 < 0) 69 result = 0; 70 else if (j0 <= 48) 71 result = i0 >> (48 - j0); 72 else 73 result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0)); 74 } 75 else 76 { 77 /* The number is too large. Unless it rounds to LLONG_MIN, 78 FE_INVALID must be raised and the return value is 79 unspecified. */ 80#if defined FE_INVALID || defined FE_INEXACT 81 if (x < (__float128) LLONG_MIN 82 && x > (__float128) LLONG_MIN - 1) 83 { 84 /* If truncation produces LLONG_MIN, the cast will not raise 85 the exception, but may raise "inexact". */ 86 t = nearbyintq (x); 87 feraiseexcept (t == LLONG_MIN ? FE_INEXACT : FE_INVALID); 88 return LLONG_MIN; 89 } 90 else if (FIX_FLT128_LLONG_CONVERT_OVERFLOW && x != (__float128) LLONG_MIN) 91 { 92 feraiseexcept (FE_INVALID); 93 return sx == 0 ? LLONG_MAX : LLONG_MIN; 94 } 95 96#endif 97 return (long long int) x; 98 } 99 100 return sx ? -result : result; 101} 102