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a1981ecbfd
This patch is using the corresponding GCC builtin for llrintf, llrint, llrintl and llrintf128 if the USE_FUNCTION_BUILTIN macros are defined to one in math-use-builtins-function.h. Co-Authored-By: Xi Ruoyao <xry111@xry111.site>
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/* Round argument to nearest integral value according to current rounding
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direction.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <limits.h>
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-ldouble.h>
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#include <fix-fp-int-convert-overflow.h>
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#include <math-use-builtins.h>
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long long int
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__llrintl (_Float128 x)
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{
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#if USE_LLRINTL_BUILTIN
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return __builtin_round (x);
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#else
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/* Use generic implementation. */
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static const _Float128 two112[2] =
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{
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L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
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L(-5.19229685853482762853049632922009600E+33) /* 0xC06F000000000000, 0 */
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};
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int32_t j0;
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uint64_t i0,i1;
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_Float128 w;
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_Float128 t;
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long long int result;
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int sx;
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GET_LDOUBLE_WORDS64 (i0, i1, x);
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j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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sx = i0 >> 63;
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i0 &= 0x0000ffffffffffffLL;
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i0 |= 0x0001000000000000LL;
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if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
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{
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#if defined FE_INVALID || defined FE_INEXACT
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/* X < LLONG_MAX + 1 implied by J0 < 63. */
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if (x > (_Float128) LLONG_MAX)
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{
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/* In the event of overflow we must raise the "invalid"
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exception, but not "inexact". */
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t = __nearbyintl (x);
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feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID);
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}
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else
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#endif
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{
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w = two112[sx] + x;
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t = w - two112[sx];
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}
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GET_LDOUBLE_WORDS64 (i0, i1, t);
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j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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i0 &= 0x0000ffffffffffffLL;
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i0 |= 0x0001000000000000LL;
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if (j0 < 0)
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result = 0;
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else if (j0 <= 48)
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result = i0 >> (48 - j0);
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else
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result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
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}
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else
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{
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/* The number is too large. Unless it rounds to LLONG_MIN,
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FE_INVALID must be raised and the return value is
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unspecified. */
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#if defined FE_INVALID || defined FE_INEXACT
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if (x < (_Float128) LLONG_MIN
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&& x > (_Float128) LLONG_MIN - 1)
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{
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/* If truncation produces LLONG_MIN, the cast will not raise
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the exception, but may raise "inexact". */
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t = __nearbyintl (x);
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feraiseexcept (t == LLONG_MIN ? FE_INEXACT : FE_INVALID);
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return LLONG_MIN;
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}
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else if (FIX_LDBL_LLONG_CONVERT_OVERFLOW && x != (_Float128) LLONG_MIN)
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{
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feraiseexcept (FE_INVALID);
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return sx == 0 ? LLONG_MAX : LLONG_MIN;
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}
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#endif
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return (long long int) x;
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}
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return sx ? -result : result;
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#endif /* ! USE_LLRINTL_BUILTIN */
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}
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libm_alias_ldouble (__llrint, llrint)
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