From 3e0df5d2d75326f49f5bad55f870cb927a0e6802 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Wed, 8 Oct 2025 12:23:22 +0200
Subject: [PATCH] BLI: inline fast case of CacheMutex.ensure

I can measure a few percent speedup by doing that in the file from #146949.

Pull Request: https://projects.blender.org/blender/blender/pulls/147608
---
 source/blender/blenlib/BLI_cache_mutex.hh    | 12 +++++++++++-
 source/blender/blenlib/intern/cache_mutex.cc |  2 +-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/source/blender/blenlib/BLI_cache_mutex.hh b/source/blender/blenlib/BLI_cache_mutex.hh
index 884984cc5fb..5dbb8efd3c7 100644
--- a/source/blender/blenlib/BLI_cache_mutex.hh
+++ b/source/blender/blenlib/BLI_cache_mutex.hh
@@ -82,7 +82,14 @@ class CacheMutex {
    * This function is thread-safe under the assumption that the same parameters are passed from
    * every thread.
    */
-  void ensure(FunctionRef<void()> compute_cache);
+  void ensure(const FunctionRef<void()> compute_cache)
+  {
+    /* Handle fast case when the cache is up-to-date. */
+    if (cache_valid_.load(std::memory_order_acquire)) {
+      return;
+    }
+    this->ensure_impl(compute_cache);
+  }
 
   /**
    * Reset the cache. The next time #ensure is called, it will recompute that code.
@@ -107,6 +114,9 @@ class CacheMutex {
   {
     return cache_valid_.load(std::memory_order_relaxed);
   }
+
+ private:
+  void ensure_impl(FunctionRef<void()> compute_cache);
 };
 
 }  // namespace blender
diff --git a/source/blender/blenlib/intern/cache_mutex.cc b/source/blender/blenlib/intern/cache_mutex.cc
index 4c83f31ed04..bc3cdfd1ee7 100644
--- a/source/blender/blenlib/intern/cache_mutex.cc
+++ b/source/blender/blenlib/intern/cache_mutex.cc
@@ -11,7 +11,7 @@
 
 namespace blender {
 
-void CacheMutex::ensure(const FunctionRef<void()> compute_cache)
+void CacheMutex::ensure_impl(const FunctionRef<void()> compute_cache)
 {
   if (cache_valid_.load(std::memory_order_acquire)) {
     return;