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/* Truncate argument to nearest integral value not larger than the argument.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define NO_MATH_REDIRECT
#include <math.h>
#include <math_private.h>
#include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
_Float128
__truncl (_Float128 x)
{
#if USE_TRUNCL_BUILTIN
return __builtin_truncl (x);
#else
/* Use generic implementation. */
int32_t j0;
uint64_t i0, i1, sx;
GET_LDOUBLE_WORDS64 (i0, i1, x);
sx = i0 & 0x8000000000000000ULL;
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
if (j0 < 48)
{
if (j0 < 0)
/* The magnitude of the number is < 1 so the result is +-0. */
SET_LDOUBLE_WORDS64 (x, sx, 0);
else
SET_LDOUBLE_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
}
else if (j0 > 111)
{
if (j0 == 0x4000)
/* x is inf or NaN. */
return x + x;
}
else
{
SET_LDOUBLE_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
}
return x;
#endif /* ! USE_TRUNCL_BUILTIN */
}
libm_alias_ldouble (__trunc, trunc)
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