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-rw-r--r--absl/base/call_once.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/absl/base/call_once.h b/absl/base/call_once.h
index 5d823a11a013..25c783e5f3e0 100644
--- a/absl/base/call_once.h
+++ b/absl/base/call_once.h
@@ -134,7 +134,10 @@ enum {
   kOnceInit = 0,
   kOnceRunning = 0x65C2937B,
   kOnceWaiter = 0x05A308D2,
-  kOnceDone = 0x3F2D8AB0,
+  // A very small constant is chosen for kOnceDone so that it fit in a single
+  // compare with immediate instruction for most common ISAs.  This is verified
+  // for x86, POWER and ARM.
+  kOnceDone = 221,    // Random Number
 };
 
 template <typename Callable, typename... Args>