[libc-commits] [libc] [libc] Add `__builtin_expect` tag on assert conditions; NFC (PR #99498)

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https://github.com/goldsteinn created https://github.com/llvm/llvm-project/pull/99498

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>From 709a7f16d5b9335ca49401db087495b0b9358651 Mon Sep 17 00:00:00 2001
From: Noah Goldstein <goldstein.w.n at gmail.com>
Date: Thu, 18 Jul 2024 22:26:47 +0800
Subject: [PATCH] [libc] Add `__builtin_expect` tag on assert conditions; NFC

---
 libc/src/__support/libc_assert.h | 2 +-
 libc/src/assert/assert.h         | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libc/src/__support/libc_assert.h b/libc/src/__support/libc_assert.h
index e3235199780c2..8bbd06c14fb66 100644
--- a/libc/src/__support/libc_assert.h
+++ b/libc/src/__support/libc_assert.h
@@ -71,7 +71,7 @@ LIBC_INLINE void report_assertion_failure(const char *assertion,
 
 #define LIBC_ASSERT(COND)                                                      \
   do {                                                                         \
-    if (!(COND)) {                                                             \
+    if (LIBC_UNLIKELY(!(COND))) {                                              \
       LIBC_NAMESPACE::write_to_stderr(__FILE__ ":" __LIBC_LINE_STR__           \
                                                ": Assertion failed: '" #COND   \
                                                "' in function: '");            \
diff --git a/libc/src/assert/assert.h b/libc/src/assert/assert.h
index 6f352af1988b3..a1104a79bfc3e 100644
--- a/libc/src/assert/assert.h
+++ b/libc/src/assert/assert.h
@@ -19,7 +19,7 @@
 #define assert(e) (void)0
 #else
 #define assert(e)                                                              \
-  ((e) ? (void)0                                                               \
-       : LIBC_NAMESPACE::__assert_fail(#e, __FILE__, __LINE__,                 \
-                                       __PRETTY_FUNCTION__))
+  (LIBC_LIKELY(e) ? (void)0                                                    \
+                  : LIBC_NAMESPACE::__assert_fail(#e, __FILE__, __LINE__,      \
+                                                  __PRETTY_FUNCTION__))
 #endif // NDEBUG