ARM: optimised integer clip functions
Originally committed as revision 24089 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -21,6 +21,8 @@
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#ifndef AVUTIL_ARM_INTMATH_H
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#define AVUTIL_ARM_INTMATH_H
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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@ -40,6 +42,38 @@ static inline av_const int FASTDIV(int a, int b)
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return r;
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}
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#define av_clip_uint8 av_clip_uint8_arm
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static inline av_const uint8_t av_clip_uint8_arm(int a)
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{
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unsigned x;
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__asm__ volatile ("usat %0, #8, %1" : "=r"(x) : "r"(a));
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return x;
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}
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#define av_clip_int8 av_clip_int8_arm
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static inline av_const uint8_t av_clip_int8_arm(int a)
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{
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unsigned x;
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__asm__ volatile ("ssat %0, #8, %1" : "=r"(x) : "r"(a));
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return x;
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}
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#define av_clip_uint16 av_clip_uint16_arm
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static inline av_const uint16_t av_clip_uint16_arm(int a)
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{
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unsigned x;
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__asm__ volatile ("usat %0, #16, %1" : "=r"(x) : "r"(a));
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return x;
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}
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#define av_clip_int16 av_clip_int16_arm
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static inline av_const int16_t av_clip_int16_arm(int a)
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{
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int x;
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__asm__ volatile ("ssat %0, #16, %1" : "=r"(x) : "r"(a));
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return x;
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}
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#else /* HAVE_ARMV6 */
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#define FASTDIV FASTDIV
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@ -53,6 +87,17 @@ static inline av_const int FASTDIV(int a, int b)
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#endif /* HAVE_ARMV6 */
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#define av_clipl_int32 av_clipl_int32_arm
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static inline av_const int32_t av_clipl_int32_arm(int64_t a)
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{
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int x, y;
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__asm__ volatile ("adds %1, %R2, %Q2, lsr #31 \n\t"
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"mvnne %1, #1<<31 \n\t"
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"eorne %0, %1, %R2, asr #31 \n\t"
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: "=r"(x), "=&r"(y) : "r"(a));
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return x;
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}
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#endif /* HAVE_INLINE_ASM */
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#endif /* AVUTIL_ARM_INTMATH_H */
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