mirror of
git://sourceware.org/git/newlib-cygwin.git
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cfbcbd1c95
This change is equivalent to the commit
c65db17340
and only affects code that is from the Arm optimized-routines project.
It does not affect the observable behaviour, but the code generation
can be different on 64bit targets. The intention is to make the
portable semantics of the code obvious by using a fixed size type.
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* Single-precision math error handling.
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Copyright (c) 2017-2018 ARM Ltd. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the company may not be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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#include "fdlibm.h"
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#if !__OBSOLETE_MATH
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#include "math_config.h"
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#if WANT_ERRNO
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#include <errno.h>
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/* NOINLINE reduces code size and avoids making math functions non-leaf
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when the error handling is inlined. */
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NOINLINE static float
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with_errnof (float y, int e)
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{
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errno = e;
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return y;
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}
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#else
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#define with_errnof(x, e) (x)
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#endif
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/* NOINLINE prevents fenv semantics breaking optimizations. */
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NOINLINE static float
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xflowf (uint32_t sign, float y)
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{
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y = (sign ? -y : y) * y;
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return with_errnof (y, ERANGE);
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}
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HIDDEN float
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__math_uflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1p-95f);
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}
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#if WANT_ERRNO_UFLOW
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/* Underflows to zero in some non-nearest rounding mode, setting errno
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is valid even if the result is non-zero, but in the subnormal range. */
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HIDDEN float
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__math_may_uflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1.4p-75f);
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}
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#endif
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HIDDEN float
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__math_oflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1p97f);
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}
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HIDDEN float
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__math_divzerof (uint32_t sign)
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{
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float y = 0;
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return with_errnof ((sign ? -1 : 1) / y, ERANGE);
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}
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HIDDEN float
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__math_invalidf (float x)
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{
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float y = (x - x) / (x - x);
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return isnan (x) ? y : with_errnof (y, EDOM);
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}
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#endif /* !__OBSOLETE_MATH */
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