mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* Single-precision math error handling.
|
|
Copyright (C) 2017-2023 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/>. */
|
|
|
|
#include "math_config.h"
|
|
|
|
#if WANT_ERRNO
|
|
# include <errno.h>
|
|
/* NOINLINE reduces code size. */
|
|
NOINLINE static float
|
|
with_errnof (float y, int e)
|
|
{
|
|
errno = e;
|
|
return y;
|
|
}
|
|
#else
|
|
# define with_errnof(x, e) (x)
|
|
#endif
|
|
|
|
/* NOINLINE prevents fenv semantics breaking optimizations. */
|
|
NOINLINE static float
|
|
xflowf (uint32_t sign, float y)
|
|
{
|
|
y = (sign ? -y : y) * y;
|
|
return with_errnof (y, ERANGE);
|
|
}
|
|
|
|
attribute_hidden float
|
|
__math_uflowf (uint32_t sign)
|
|
{
|
|
return xflowf (sign, 0x1p-95f);
|
|
}
|
|
|
|
#if WANT_ERRNO_UFLOW
|
|
/* Underflows to zero in some non-nearest rounding mode, setting errno
|
|
is valid even if the result is non-zero, but in the subnormal range. */
|
|
attribute_hidden float
|
|
__math_may_uflowf (uint32_t sign)
|
|
{
|
|
return xflowf (sign, 0x1.4p-75f);
|
|
}
|
|
#endif
|
|
|
|
attribute_hidden float
|
|
__math_oflowf (uint32_t sign)
|
|
{
|
|
return xflowf (sign, 0x1p97f);
|
|
}
|
|
|
|
attribute_hidden float
|
|
__math_divzerof (uint32_t sign)
|
|
{
|
|
float y = 0;
|
|
return with_errnof ((sign ? -1 : 1) / y, ERANGE);
|
|
}
|
|
|
|
attribute_hidden float
|
|
__math_invalidf (float x)
|
|
{
|
|
float y = (x - x) / (x - x);
|
|
return isnan (x) ? y : with_errnof (y, EDOM);
|
|
}
|