Move av_log2 function and asociated table to the codec lib, remove 3 identical implementations, always have LUT in iram (gives a *tiny* speedup on coldfire), make the clz based function return the same value as the non clz based function for 0 input to be safe (slows down flac ~2% on the gigabeat S)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23858 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 1 insertions, 50 deletions

diff --git a/apps/codecs/libffmpegFLAC/SOURCES b/apps/codecs/libffmpegFLAC/SOURCES
index 823a2b7..deed19b 100644
--- a/apps/codecs/libffmpegFLAC/SOURCES
+++ b/apps/codecs/libffmpegFLAC/SOURCES
@@ -1,9 +1,6 @@
 bitstream.c
 decoder.c
 shndec.c
-#if !(defined(CPU_ARM) && (ARM_ARCH > 4))
-tables.c
-#endif
 #if defined(CPU_COLDFIRE)
 coldfire.S
 #elif defined(CPU_ARM)
diff --git a/apps/codecs/libffmpegFLAC/golomb.h b/apps/codecs/libffmpegFLAC/golomb.h
index 11753fc..4f99671 100644
--- a/apps/codecs/libffmpegFLAC/golomb.h
+++ b/apps/codecs/libffmpegFLAC/golomb.h
@@ -20,35 +20,7 @@
  */
 
 #include <limits.h>
-
-#if (defined(CPU_ARM) && (ARM_ARCH > 4))
-static inline int av_log2(uint32_t v)
-{
-    return 31 - __builtin_clz(v);
-}
-#else
-
-/* From libavutil/common.h */
-extern const uint8_t ff_log2_tab[256];
-
-static inline int av_log2(unsigned int v)
-{
-    int n;
-
-    n = 0;
-    if (v & 0xffff0000) {
-        v >>= 16;
-        n += 16;
-    }
-    if (v & 0xff00) {
-        v >>= 8;
-        n += 8;
-    }
-    n += ff_log2_tab[v];
-
-    return n;
-}
-#endif
+#include "codeclib.h"
 
 /**
  * @file golomb.h
diff --git a/apps/codecs/libffmpegFLAC/tables.c b/apps/codecs/libffmpegFLAC/tables.c
deleted file mode 100644
index 58b1bb6..0000000
--- a/apps/codecs/libffmpegFLAC/tables.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifdef BUILD_STANDALONE
-#define ICONST_ATTR
-#else
-#include "codeclib.h"
-#endif
-#include <inttypes.h>
-
-/* From ffmpeg - libavutil/common.h */
-const uint8_t ff_log2_tab[256] ICONST_ATTR = {
-    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
-};