90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* Single-precision math error handling.
|
|
Copyright (c) 2017 ARM Ltd. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
1. Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
3. The name of the company may not be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS AND ANY EXPRESS OR IMPLIED
|
|
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
|
|
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
|
|
|
|
#include "fdlibm.h"
|
|
#if !__OBSOLETE_MATH
|
|
|
|
#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 (unsigned long sign, float y)
|
|
{
|
|
y = (sign ? -y : y) * y;
|
|
return with_errnof (y, ERANGE);
|
|
}
|
|
|
|
HIDDEN float
|
|
__math_uflowf (unsigned long 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 (unsigned long sign)
|
|
{
|
|
return xflowf (sign, 0x1.4p-75f);
|
|
}
|
|
#endif
|
|
|
|
HIDDEN float
|
|
__math_oflowf (unsigned long sign)
|
|
{
|
|
return xflowf (sign, 0x1p97f);
|
|
}
|
|
|
|
HIDDEN float
|
|
__math_divzerof (unsigned long 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);
|
|
}
|
|
#endif /* !__OBSOLETE_MATH */
|