optimizing av_log2

Originally committed as revision 1515 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/common.c b/libavcodec/common.c
index 4868bc0..aa76628 100644 (file)
--- a/libavcodec/common.c
+++ b/libavcodec/common.c
@@ -27,6 +27,17 @@ const UINT8 ff_sqrt_tab[128]={
         9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
 };
 
         9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
 };
 

+const uint8_t ff_log2_tab[256]={
+        0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+        5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
+        6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+        6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
+};
+

 void init_put_bits(PutBitContext *s, 
                    UINT8 *buffer, int buffer_size,
                    void *opaque,
 void init_put_bits(PutBitContext *s, 
                    UINT8 *buffer, int buffer_size,
                    void *opaque,

diff --git a/libavcodec/common.h b/libavcodec/common.h
index bdfa398..dadc184 100644 (file)
--- a/libavcodec/common.h
+++ b/libavcodec/common.h
@@ -804,6 +804,7 @@ void print_stats(void);
 #endif
 
 /* misc math functions */
 #endif
 
 /* misc math functions */

+extern const uint8_t ff_log2_tab[256];

 
 static inline int av_log2(unsigned int v)
 {
 
 static inline int av_log2(unsigned int v)
 {


@@ -818,20 +819,26 @@ static inline int av_log2(unsigned int v)
         v >>= 8;
         n += 8;
     }
         v >>= 8;
         n += 8;
     }

-    if (v & 0xf0) {
-        v >>= 4;
-        n += 4;
-    }
-    if (v & 0xc) {
-        v >>= 2;
-        n += 2;
-    }
-    if (v & 0x2) {
-        n++;
+    n += ff_log2_tab[v];
+
+    return n;
+}
+
+static inline int av_log2_16bit(unsigned int v)
+{
+    int n;
+
+    n = 0;
+    if (v & 0xff00) {
+        v >>= 8;
+        n += 8;

     }
     }

+    n += ff_log2_tab[v];
+

     return n;
 }
 
     return n;
 }
 

+

 /* median of 3 */
 static inline int mid_pred(int a, int b, int c)
 {
 /* median of 3 */
 static inline int mid_pred(int a, int b, int c)
 {


@@ -861,7 +868,7 @@ static inline int clip(int a, int amin, int amax)
 }
 
 /* math */
 }
 
 /* math */

-extern const UINT8 ff_sqrt_tab[128];
+extern const uint8_t ff_sqrt_tab[128];

 
 int ff_gcd(int a, int b);
 
 
 int ff_gcd(int a, int b);