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

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Nick Mathewson 2018-10-15 10:16:34 -04:00
parent bb465be085
commit 5e582c7ffa
1 changed files with 4 additions and 0 deletions
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src/common/util_bug.h
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@ -38,6 +38,10 @@
* and then passed right to a conditional. If you do anything else to the * 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 * expression here, or introduce any more parentheses, the compiler won't
* help you. * 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) \ #define ASSERT_PREDICT_UNLIKELY_(e) \
({ \ ({ \