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/*
* Single-precision math error handling.
*
* Copyright (c) 2017, Arm Limited.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "math_config.h"
#if WANT_ERRNO
#include <errno.h>
/* NOINLINE reduces code size and avoids making math functions non-leaf
when the error handling is inlined. */
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);
}
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. */
HIDDEN float
__math_may_uflowf (uint32_t sign)
{
return xflowf (sign, 0x1.4p-75f);
}
#endif
HIDDEN float
__math_oflowf (uint32_t sign)
{
return xflowf (sign, 0x1p97f);
}
HIDDEN float
__math_divzerof (uint32_t sign)
{
float y = 0;
return with_errnof ((sign ? -1 : 1) / y, ERANGE);
}
HIDDEN float
__math_invalidf (float x)
{
float y = (x - x) / (x - x);
return isnan (x) ? y : with_errnof (y, EDOM);
}
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