From e3a7eab78923e84cb2301797590583279880cf6c Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Sat, 24 Apr 2021 10:05:18 +0100
Subject: [PATCH] unlikely annotation introduction proposal.

---
 src/ds/defines.h | 4 +++-
 src/pal/pal.h    | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ds/defines.h b/src/ds/defines.h
index 7ccbdb2..e67e36d 100644
--- a/src/ds/defines.h
+++ b/src/ds/defines.h
@@ -8,6 +8,7 @@
 #  define SNMALLOC_SLOW_PATH NOINLINE
 #  define SNMALLOC_FAST_PATH ALWAYSINLINE
 #  define SNMALLOC_PURE
+#  define SNMALLOC_COLD
 #else
 #  define likely(x) __builtin_expect(!!(x), 1)
 #  define unlikely(x) __builtin_expect(!!(x), 0)
@@ -16,6 +17,7 @@
 #  define SNMALLOC_SLOW_PATH NOINLINE
 #  define SNMALLOC_FAST_PATH inline ALWAYSINLINE
 #  define SNMALLOC_PURE __attribute__((const))
+#  define SNMALLOC_COLD __attribute__((cold))
 #endif
 
 #if !defined(__clang__) && defined(__GNUC__)
@@ -37,7 +39,7 @@
 namespace snmalloc
 {
   // Forwards reference so that the platform can define how to handle errors.
-  [[noreturn]] void error(const char* const str);
+  [[noreturn]] SNMALLOC_COLD void error(const char* const str);
 } // namespace snmalloc
 
 #define TOSTRING(expr) TOSTRING2(expr)
diff --git a/src/pal/pal.h b/src/pal/pal.h
index bcd9293..10f9cd8 100644
--- a/src/pal/pal.h
+++ b/src/pal/pal.h
@@ -61,7 +61,8 @@ namespace snmalloc
     DefaultPal;
 #endif
 
-  [[noreturn]] SNMALLOC_SLOW_PATH inline void error(const char* const str)
+  [[noreturn]] SNMALLOC_SLOW_PATH inline SNMALLOC_COLD void
+  error(const char* const str)
   {
     Pal::error(str);
   }