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Mark index as unsigend so gcc knows it doesnt need a sign extension o…

…n x86_64.

Any tips on how i can convince gcc that it doesnt need a
mov     %eax, %eax
in every get_bits() ?

Originally committed as revision 21433 to svn://svn.ffmpeg.org/ffmpeg/trunk
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1 parent 449d144 commit d9ef0d2e143341be0a543e328ccc247ad2905888 @michaelni michaelni committed Jan 24, 2010
Showing with 6 additions and 4 deletions.
  1. +6 −4 libavcodec/get_bits.h
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10 libavcodec/get_bits.h
@@ -152,7 +152,7 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
# define MIN_CACHE_BITS 25
# define OPEN_READER(name, gb)\
- int name##_index= (gb)->index;\
+ unsigned int name##_index= (gb)->index;\
int name##_cache= 0;\
# define CLOSE_READER(name, gb)\
@@ -413,7 +413,7 @@ static inline void skip_bits(GetBitContext *s, int n){
static inline unsigned int get_bits1(GetBitContext *s){
#ifdef ALT_BITSTREAM_READER
- int index= s->index;
+ unsigned int index= s->index;
uint8_t result= s->buffer[ index>>3 ];
#ifdef ALT_BITSTREAM_READER_LE
result>>= (index&0x07);
@@ -557,7 +557,8 @@ void free_vlc(VLC *vlc);
*/
#define GET_VLC(code, name, gb, table, bits, max_depth)\
{\
- int n, index, nb_bits;\
+ int n, nb_bits;\
+ unsigned int index;\
\
index= SHOW_UBITS(name, gb, bits);\
code = table[index][0];\
@@ -588,7 +589,8 @@ void free_vlc(VLC *vlc);
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
{\
- int n, index, nb_bits;\
+ int n, nb_bits;\
+ unsigned int index;\
\
index= SHOW_UBITS(name, gb, bits);\
level = table[index].level;\

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