diff --git a/apps/codecs/libtremor/bitwise.c b/apps/codecs/libtremor/bitwise.c
index caa42f4277..dabba468b9 100644
--- a/apps/codecs/libtremor/bitwise.c
+++ b/apps/codecs/libtremor/bitwise.c
@@ -131,8 +131,8 @@ static int _halt_one(oggpack_buffer *b){
 }
 
 /* bits <= 32 */
-long oggpack_read(oggpack_buffer *b,int bits) ICODE_ATTR_TREMOR_NOT_MDCT;
-long oggpack_read(oggpack_buffer *b,int bits){
+long oggpack_read(oggpack_buffer *b,register int bits) ICODE_ATTR_TREMOR_NOT_MDCT;
+long oggpack_read(oggpack_buffer *b,register int bits){
   unsigned long m=oggpack_mask[bits];
   ogg_uint32_t ret=-1;
 
diff --git a/apps/codecs/libtremor/codebook.c b/apps/codecs/libtremor/codebook.c
index f291686870..dd0908ba6a 100644
--- a/apps/codecs/libtremor/codebook.c
+++ b/apps/codecs/libtremor/codebook.c
@@ -451,7 +451,7 @@ static long vorbis_book_decodevv_add_2ch_even(codebook *book,ogg_int32_t **a,
 long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,
 			      long offset,int ch,
 			      oggpack_buffer *b,int n,int point){
-  if(book->used_entries>0){
+  if(LIKELY(book->used_entries>0)){
     long i,j,k,chunk,read;
     int chptr=0;
     int shift=point-book->binarypoint;
diff --git a/apps/codecs/libtremor/floor1.c b/apps/codecs/libtremor/floor1.c
index 4ee58c18ca..fa81b0d197 100644
--- a/apps/codecs/libtremor/floor1.c
+++ b/apps/codecs/libtremor/floor1.c
@@ -299,7 +299,7 @@ static void render_line(int n, int x0,register int x1,int y0,int y1,ogg_int32_t
   if(n>x1)n=x1;
   ady-=abs(base*adx);
 
-  if(x<n)
+  if(LIKELY(x<n))
     d[x]= MULT31_SHIFT15(d[x],FLOOR_fromdB_LOOKUP[y]);
 
   while(++x<n){
diff --git a/apps/codecs/libtremor/ogg.h b/apps/codecs/libtremor/ogg.h
index 7e2785f117..15ca46b3cd 100644
--- a/apps/codecs/libtremor/ogg.h
+++ b/apps/codecs/libtremor/ogg.h
@@ -142,7 +142,7 @@ typedef struct {
 
 extern void  oggpack_readinit(oggpack_buffer *b,ogg_reference *r);
 extern long  oggpack_look_full(oggpack_buffer *b,int bits);
-extern long  oggpack_read(oggpack_buffer *b,int bits);
+extern long  oggpack_read(oggpack_buffer *b,register int bits);
 
 /* Inline a few, often called functions */