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avutil/tablegen: add tablegen libm compatibility shims

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This is useful for build-time table generation (--enable-hardcoded-tables),
by providing compat shims for hosts that have broken libms.

This file is deliberately kept minimal; functions can always be added on
an as-needed basis.

Reviewed-by: Clément Bœsch <u@pkh.me>
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-11-26 09:43:52 -05:00
parent 789ef087c6
commit 538e8ab512
1 changed files with 53 additions and 0 deletions
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53
libavutil/tablegen.h Normal file
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/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Compatibility libm for table generation files
*/
#ifndef AVUTIL_TABLEGEN_H
#define AVUTIL_TABLEGEN_H
// we lack some functions on all host platforms, and we don't care about
// performance and/or strict ISO C semantics as it's performed at build time
static inline double ff_cbrt(double x)
{
return x < 0 ? -pow(-x, 1.0 / 3.0) : pow(x, 1.0 / 3.0);
}
#define cbrt ff_cbrt
static inline double ff_rint(double x)
{
return x >= 0 ? floor(x + 0.5) : ceil(x - 0.5);
}
#define rint ff_rint
static inline long long ff_llrint(double x)
{
return rint(x);
}
#define llrint ff_llrint
static inline long ff_lrint(double x)
{
return rint(x);
}
#define lrint ff_lrint
#endif /* AVUTIL_TABLEGEN_H */