ARM: optimised integer clip functions

Originally committed as revision 24089 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/arm/intmath.h

@@ -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 */