help some gcc version to optimize out those functions

Originally committed as revision 9785 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dsputil.c

@@ -2641,6 +2641,7 @@ static void put_mspel8_mc22_c(uint8_t *dst, uint8_t *src, int stride){
 }
 
 static void h263_v_loop_filter_c(uint8_t *src, int stride, int qscale){
+    if(ENABLE_ANY_H263) {
     int x;
     const int strength= ff_h263_loop_filter_strength[qscale];
 
@@ -2674,8 +2675,10 @@ static void h263_v_loop_filter_c(uint8_t *src, int stride, int qscale){
         src[x+  stride] = p3 + d2;
     }
     }
+}
 
 static void h263_h_loop_filter_c(uint8_t *src, int stride, int qscale){
+    if(ENABLE_ANY_H263) {
     int y;
     const int strength= ff_h263_loop_filter_strength[qscale];
 
@@ -2709,6 +2712,7 @@ static void h263_h_loop_filter_c(uint8_t *src, int stride, int qscale){
         src[y*stride+1] = p3 + d2;
     }
     }
+}
 
 static void h261_loop_filter_c(uint8_t *src, int stride){
     int x,y,xy,yz;

libavcodec/i386/dsputil_mmx.c

@@ -622,6 +622,7 @@ static void add_bytes_mmx(uint8_t *dst, uint8_t *src, int w){
         "paddb %%mm1, %%mm6             \n\t"
 
 static void h263_v_loop_filter_mmx(uint8_t *src, int stride, int qscale){
+    if(ENABLE_ANY_H263) {
     const int strength= ff_h263_loop_filter_strength[qscale];
 
     asm volatile(
@@ -639,6 +640,7 @@ static void h263_v_loop_filter_mmx(uint8_t *src, int stride, int qscale){
         : "g" (2*strength), "m"(ff_pb_FC)
     );
     }
+}
 
 static inline void transpose4x4(uint8_t *dst, uint8_t *src, int dst_stride, int src_stride){
     asm volatile( //FIXME could save 1 instruction if done as 8x4 ...
@@ -670,6 +672,7 @@ static inline void transpose4x4(uint8_t *dst, uint8_t *src, int dst_stride, int
 }
 
 static void h263_h_loop_filter_mmx(uint8_t *src, int stride, int qscale){
+    if(ENABLE_ANY_H263) {
     const int strength= ff_h263_loop_filter_strength[qscale];
     uint64_t temp[4] __attribute__ ((aligned(8)));
     uint8_t *btemp= (uint8_t*)temp;
@@ -719,6 +722,7 @@ static void h263_h_loop_filter_mmx(uint8_t *src, int stride, int qscale){
            "r" ((long)(3*stride))
     );
     }
+}
 
 #ifdef CONFIG_ENCODERS
 static int pix_norm1_mmx(uint8_t *pix, int line_size) {