tor

commit 5e582c7ffafd9075373131e5e55b69507f54206e
parent bb465be085ff8d1640f1d1c0bbb65605d85b5528
Author: Nick Mathewson <nickm@torproject.org>
Date:   Mon, 15 Oct 2018 10:16:34 -0400

Explain a bit more about branch prediction in the unit-test case

Diffstat:
M
src/common/util_bug.h
 | 
4
++++

1 file changed, 4 insertions(+), 0 deletions(-)
diff --git a/src/common/util_bug.h b/src/common/util_bug.h
@@ -38,6 +38,10 @@
  * and then passed right to a conditional.  If you do anything else to the
  * expression here, or introduce any more parentheses, the compiler won't
  * help you.
+ *
+ * We only do this for the unit-test build case because it interferes with
+ * the likely-branch labeling.  Note below that in the other case, we define
+ * these macros to just be synonyms for PREDICT_(UN)LIKELY.
  */
 #define ASSERT_PREDICT_UNLIKELY_(e)             \
   ({                                            \