Remove redundant checks against MIN_CACHE_BITS

With the removal of the libmpeg2 bitstream reader, MIN_CACHE_BITS
is always >= 25, so tests against smaller values can be removed.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit f162e988aa)

libavcodec/aacdec.c

@@ -1062,9 +1062,6 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
 
                             UPDATE_CACHE(re, gb);
                             GET_VLC(code, re, gb, vlc_tab, 8, 2);
-#if MIN_CACHE_BITS < 20
-                            UPDATE_CACHE(re, gb);
-#endif
                             cb_idx = cb_vector_idx[code];
                             nnz = cb_idx >> 8 & 15;
                             bits = SHOW_UBITS(re, gb, nnz) << (32-nnz);
@@ -1157,12 +1154,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
                                         return -1;
                                     }
 
-#if MIN_CACHE_BITS < 21
-                                    LAST_SKIP_BITS(re, gb, b + 1);
-                                    UPDATE_CACHE(re, gb);
-#else
                                     SKIP_BITS(re, gb, b + 1);
-#endif
                                     b += 4;
                                     n = (1 << b) + SHOW_UBITS(re, gb, b);
                                     LAST_SKIP_BITS(re, gb, b);

libavcodec/mpeg12.c

@@ -718,9 +718,6 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 goto end;
         }
-#if MIN_CACHE_BITS < 19
-        UPDATE_CACHE(re, &s->gb);
-#endif
         /* now quantify & encode AC coefficients */
         for(;;) {
             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
@@ -760,14 +757,9 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
             }
 
             block[j] = level;
-#if MIN_CACHE_BITS < 19
-            UPDATE_CACHE(re, &s->gb);
-#endif
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 break;
-#if MIN_CACHE_BITS >= 19
             UPDATE_CACHE(re, &s->gb);
-#endif
         }
 end:
         LAST_SKIP_BITS(re, &s->gb, 2);
@@ -800,9 +792,6 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *bloc
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 goto end;
         }
-#if MIN_CACHE_BITS < 19
-        UPDATE_CACHE(re, &s->gb);
-#endif
 
         /* now quantify & encode AC coefficients */
         for(;;) {
@@ -839,14 +828,9 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *bloc
             }
 
             block[j] = level;
-#if MIN_CACHE_BITS < 19
-            UPDATE_CACHE(re, &s->gb);
-#endif
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 break;
-#if MIN_CACHE_BITS >= 19
             UPDATE_CACHE(re, &s->gb);
-#endif
         }
 end:
         LAST_SKIP_BITS(re, &s->gb, 2);
@@ -891,9 +875,6 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 goto end;
         }
-#if MIN_CACHE_BITS < 19
-        UPDATE_CACHE(re, &s->gb);
-#endif
 
         /* now quantify & encode AC coefficients */
         for(;;) {
@@ -927,14 +908,9 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 
             mismatch ^= level;
             block[j] = level;
-#if MIN_CACHE_BITS < 19
-            UPDATE_CACHE(re, &s->gb);
-#endif
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 break;
-#if MIN_CACHE_BITS >= 19
             UPDATE_CACHE(re, &s->gb);
-#endif
         }
 end:
         LAST_SKIP_BITS(re, &s->gb, 2);
@@ -969,9 +945,6 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
             goto end;
     }
-#if MIN_CACHE_BITS < 19
-    UPDATE_CACHE(re, &s->gb);
-#endif
 
     /* now quantify & encode AC coefficients */
     for(;;) {
@@ -1000,14 +973,9 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
         }
 
         block[j] = level;
-#if MIN_CACHE_BITS < 19
-        UPDATE_CACHE(re, &s->gb);
-#endif
         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
             break;
-#if MIN_CACHE_BITS >=19
         UPDATE_CACHE(re, &s->gb);
-#endif
     }
 end:
     LAST_SKIP_BITS(re, &s->gb, 2);

libavcodec/mpeg4videodec.c

@@ -1023,12 +1023,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
                     if(last) i+=192;
                 } else {
                     /* second escape */
-#if MIN_CACHE_BITS < 20
-                    LAST_SKIP_BITS(re, &s->gb, 2);
-                    UPDATE_CACHE(re, &s->gb);
-#else
                     SKIP_BITS(re, &s->gb, 2);
-#endif
                     GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
                     i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
                     level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
@@ -1036,12 +1031,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
                 }
             } else {
                 /* first escape */
-#if MIN_CACHE_BITS < 19
-                LAST_SKIP_BITS(re, &s->gb, 1);
-                UPDATE_CACHE(re, &s->gb);
-#else
                 SKIP_BITS(re, &s->gb, 1);
-#endif
                 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
                 i+= run;
                 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing

libavcodec/msmpeg4.c

@@ -1797,12 +1797,7 @@ int ff_msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
 #endif
                 } else {
                     /* second escape */
-#if MIN_CACHE_BITS < 23
-                    LAST_SKIP_BITS(re, &s->gb, 2);
-                    UPDATE_CACHE(re, &s->gb);
-#else
                     SKIP_BITS(re, &s->gb, 2);
-#endif
                     GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
                     i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
                     level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
@@ -1816,12 +1811,7 @@ int ff_msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
                 }
             } else {
                 /* first escape */
-#if MIN_CACHE_BITS < 22
-                LAST_SKIP_BITS(re, &s->gb, 1);
-                UPDATE_CACHE(re, &s->gb);
-#else
                 SKIP_BITS(re, &s->gb, 1);
-#endif
                 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
                 i+= run;
                 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing