89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/* Copyright (C) 1996-2022 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 <math.h>
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#include <get-rounding-mode.h>
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#include <stdint.h>
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#include <math-barriers.h>
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#include <libm-alias-double.h>
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# define IREG_SIZE 64
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# ifdef __ILP32__
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# define OREG_SIZE 32
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# else
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# define OREG_SIZE 64
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# endif
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# define IREGS "d"
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#if OREG_SIZE == 32
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# define OREGS "w"
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#else
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# define OREGS "x"
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#endif
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long int
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__lrint (double x)
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{
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#if IREG_SIZE == 64 && OREG_SIZE == 32
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long int result;
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if (__builtin_fabs (x) > INT32_MAX)
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{
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/* Converting large values to a 32 bit int may cause the frintx/fcvtza
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sequence to set both FE_INVALID and FE_INEXACT. To avoid this
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check the rounding mode and do a single instruction with the
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appropriate rounding mode. */
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switch (get_rounding_mode ())
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{
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case FE_TONEAREST:
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asm volatile ("fcvtns" "\t%" OREGS "0, %" IREGS "1"
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: "=r" (result) : "w" (x));
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break;
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case FE_UPWARD:
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asm volatile ("fcvtps" "\t%" OREGS "0, %" IREGS "1"
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: "=r" (result) : "w" (x));
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break;
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case FE_DOWNWARD:
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asm volatile ("fcvtms" "\t%" OREGS "0, %" IREGS "1"
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: "=r" (result) : "w" (x));
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break;
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case FE_TOWARDZERO:
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default:
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asm volatile ("fcvtzs" "\t%" OREGS "0, %" IREGS "1"
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: "=r" (result) : "w" (x));
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}
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return result;
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}
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#endif
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double r = __builtin_rint (x);
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/* Prevent gcc from calling lrint directly when compiled with
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-fno-math-errno by inserting a barrier. */
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math_opt_barrier (r);
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return r;
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}
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libm_alias_double (__lrint, lrint)
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