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/*
* Single-precision math error handling.
*
* Copyright (c) 2017-2020, Arm Limited.
* SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
*/
#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 reduces code size. */
NOINLINE static float
xflowf (uint32_t sign, float y)
{
y = eval_as_float (opt_barrier_float (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 = opt_barrier_float (sign ? -1.0f : 1.0f) / 0.0f;
return with_errnof (y, ERANGE);
}
HIDDEN float
__math_invalidf (float x)
{
float y = (x - x) / (x - x);
return isnan (x) ? y : with_errnof (y, EDOM);
}
/* Check result and set errno if necessary. */
HIDDEN float
__math_check_uflowf (float y)
{
return y == 0.0f ? with_errnof (y, ERANGE) : y;
}
HIDDEN float
__math_check_oflowf (float y)
{
return isinf (y) ? with_errnof (y, ERANGE) : y;
}
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