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Create libretro-common/include/compat/intrinsics.h

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This commit is contained in:
twinaphex 2016-06-07 04:07:12 +02:00
parent d44062d841
commit 6fc943228e
2 changed files with 66 additions and 26 deletions
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27
libretro-common/algorithms/mismatch.c
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@ -26,6 +26,7 @@
#include <retro_inline.h>
#include <algorithms/mismatch.h>
#include <compat/intrinsics.h>
#if defined(__x86_64__) || defined(__i386__) || defined(__i486__) || defined(__i686__)
#define CPU_X86
@ -40,32 +41,6 @@
#include <emmintrin.h>
#endif
#if __SSE2__
#if defined(__GNUC__)
static INLINE int compat_ctz(unsigned x)
{
return __builtin_ctz(x);
}
#else
/* Only checks at nibble granularity,
* because that's what we need. */
static INLINE int compat_ctz(unsigned x)
{
if (x & 0x000f)
return 0;
if (x & 0x00f0)
return 4;
if (x & 0x0f00)
return 8;
if (x & 0xf000)
return 12;
return 16;
}
#endif
#endif
/* There's no equivalent in libc, you'd think so ...
* std::mismatch exists, but it's not optimized at all. */
size_t find_change(const uint16_t *a, const uint16_t *b)

65
libretro-common/include/compat/intrinsics.h Normal file
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@ -0,0 +1,65 @@
/* Copyright (C) 2010-2016 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (intrinsics.h).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __LIBRETRO_SDK_COMPAT_INTRINSICS_H
#define __LIBRETRO_SDK_COMPAT_INTRINSICS_H
#include <string.h>
#include <stddef.h>
#include <retro_common_api.h>
#include <retro_inline.h>
RETRO_BEGIN_DECLS
#if defined(__GNUC__)
static INLINE int compat_ctz(unsigned x)
{
return __builtin_ctz(x);
}
#elif defined(_MSC_VER) && defined(_MSC_VER >= 1400)
static INLINE int compat_ctz(unsigned x)
{
int r = 0;
_BitScanReverse(&r, x);
return r;
}
#else
/* Only checks at nibble granularity,
* because that's what we need. */
static INLINE int compat_ctz(unsigned x)
{
if (x & 0x000f)
return 0;
if (x & 0x00f0)
return 4;
if (x & 0x0f00)
return 8;
if (x & 0xf000)
return 12;
return 16;
}
#endif
RETRO_END_DECLS
#endif