Introduce likely/unlikely macros, use them in saa.c

Introduce the likely() and unlikely() macros, as used in Linux.
They are compiler-dependent hints that a particular boolean expression
is likely to be true or false, respectively.

Currently only implemented for gcc.

1 files changed, 2 insertions, 2 deletions

diff --git a/saa.c b/saa.c
index 51123da..1704b7d 100644
--- a/saa.c
+++ b/saa.c
@@ -211,7 +211,7 @@ void saa_fread(struct SAA *s, size_t posn, void *data, size_t len)
 	return;
     }
 
-    if (s->blk_len == SAA_BLKLEN) {
+    if (likely(s->blk_len == SAA_BLKLEN)) {
 	ix = posn >> SAA_BLKSHIFT;
 	s->rpos = posn & (SAA_BLKLEN-1);
     } else {
@@ -235,7 +235,7 @@ void saa_fwrite(struct SAA *s, size_t posn, const void *data, size_t len)
 	return;
     }
     
-    if (s->blk_len == SAA_BLKLEN) {
+    if (likely(s->blk_len == SAA_BLKLEN)) {
 	ix = posn >> SAA_BLKSHIFT;
 	s->wpos = posn & (SAA_BLKLEN-1);
     } else {