74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* Round float value to long int.
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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-float.h>
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#include <fix-fp-int-convert-overflow.h>
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long int
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__lroundf (float x)
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{
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int32_t j0;
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uint32_t i;
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long int result;
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int sign;
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GET_FLOAT_WORD (i, x);
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j0 = ((i >> 23) & 0xff) - 0x7f;
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sign = (i & 0x80000000) != 0 ? -1 : 1;
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i &= 0x7fffff;
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i |= 0x800000;
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if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
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{
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if (j0 < 0)
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return j0 < -1 ? 0 : sign;
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else if (j0 >= 23)
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result = (long int) i << (j0 - 23);
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else
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{
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i += 0x400000 >> j0;
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result = i >> (23 - j0);
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}
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}
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else
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{
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#ifdef FE_INVALID
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/* The number is too large. Unless it rounds to LONG_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 (FIX_FLT_LONG_CONVERT_OVERFLOW && x != (float) LONG_MIN)
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{
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feraiseexcept (FE_INVALID);
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return sign == 1 ? LONG_MAX : LONG_MIN;
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}
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#endif
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return (long int) x;
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}
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return sign * result;
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}
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libm_alias_float (__lround, lround)
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