mirror of git://sourceware.org/git/glibc.git
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* Round to integer type (C23 version). ldbl-96 version.
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Copyright (C) 2016-2025 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 <errno.h>
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#include <fenv.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 <stdbool.h>
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#include <stdint.h>
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#include <shlib-compat.h>
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#define FLOAT long double
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#define PREFIX LDBL_
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#define SUFFIX l
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#define BIAS 0x3fff
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#define MANT_DIG 64
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#include <fromfp.h>
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long double
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FUNC (long double x, int round, unsigned int width)
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{
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width = fromfp_adjust_width (width);
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long double rx = fromfp_round (x, round);
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if (width == 0 || !isfinite (rx))
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return fromfp_domain_error ();
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uint16_t se;
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uint32_t hx, lx;
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GET_LDOUBLE_WORDS (se, hx, lx, rx);
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bool negative = (se & 0x8000) != 0;
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int exponent = se & 0x7fff;
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exponent -= BIAS;
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int max_exponent = fromfp_max_exponent (negative, width);
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uint64_t ix = (((uint64_t) hx) << 32) | lx;
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if (exponent > max_exponent
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|| (!UNSIGNED
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&& negative
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&& exponent == max_exponent
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&& ix != 0x8000000000000000ULL))
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return fromfp_domain_error ();
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return fromfp_return (x, rx);
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}
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