add doc

c8ef · c8ef · commit 55f945c6ca9d · 2024-11-26T08:58:45.000+08:00
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
@@ -647,6 +647,9 @@ elementwise to the input.
 
 Unless specified otherwise operation(±0) = ±0 and operation(±infinity) = ±infinity
 
+The integer elementwise intrinsics, including ``__builtin_elementwise_popcount``,
+can be called in a ``constexpr`` context.
+
 ============================================== ====================================================================== =========================================
          Name                                   Operation                                                             Supported element types
 ============================================== ====================================================================== =========================================
