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ARM: optimised integer clip functions

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Originally committed as revision 24089 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-07-07 17:27:51 +00:00
parent edd7fa82d7
commit 9077e29ecc
1 changed files with 45 additions and 0 deletions
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45
libavutil/arm/intmath.h
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@ -21,6 +21,8 @@
#ifndef AVUTIL_ARM_INTMATH_H
#define AVUTIL_ARM_INTMATH_H
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
@ -40,6 +42,38 @@ static inline av_const int FASTDIV(int a, int b)
return r;
}
#define av_clip_uint8 av_clip_uint8_arm
static inline av_const uint8_t av_clip_uint8_arm(int a)
{
unsigned x;
__asm__ volatile ("usat %0, #8, %1" : "=r"(x) : "r"(a));
return x;
}
#define av_clip_int8 av_clip_int8_arm
static inline av_const uint8_t av_clip_int8_arm(int a)
{
unsigned x;
__asm__ volatile ("ssat %0, #8, %1" : "=r"(x) : "r"(a));
return x;
}
#define av_clip_uint16 av_clip_uint16_arm
static inline av_const uint16_t av_clip_uint16_arm(int a)
{
unsigned x;
__asm__ volatile ("usat %0, #16, %1" : "=r"(x) : "r"(a));
return x;
}
#define av_clip_int16 av_clip_int16_arm
static inline av_const int16_t av_clip_int16_arm(int a)
{
int x;
__asm__ volatile ("ssat %0, #16, %1" : "=r"(x) : "r"(a));
return x;
}
#else /* HAVE_ARMV6 */
#define FASTDIV FASTDIV
@ -53,6 +87,17 @@ static inline av_const int FASTDIV(int a, int b)
#endif /* HAVE_ARMV6 */
#define av_clipl_int32 av_clipl_int32_arm
static inline av_const int32_t av_clipl_int32_arm(int64_t a)
{
int x, y;
__asm__ volatile ("adds %1, %R2, %Q2, lsr #31 \n\t"
"mvnne %1, #1<<31 \n\t"
"eorne %0, %1, %R2, asr #31 \n\t"
: "=r"(x), "=&r"(y) : "r"(a));
return x;
}
#endif /* HAVE_INLINE_ASM */
#endif /* AVUTIL_ARM_INTMATH_H */