From 8fb0d6df11e4d2b4a534c96fcc1b55459940151e Mon Sep 17 00:00:00 2001 From: Anastasia Stulova Date: Thu, 29 Apr 2021 14:02:29 +0100 Subject: [PATCH] [OpenCL][Docs] Describe extension for legacy atomics with generic addr space. This extension is primarily targeting SPIR-V compilations flow as the IR translation is the same between 1.x and 2.x atomics. Differential Revision: https://reviews.llvm.org/D101089 --- clang/docs/LanguageExtensions.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst index 0075911..5e53828 100644 --- a/clang/docs/LanguageExtensions.rst +++ b/clang/docs/LanguageExtensions.rst @@ -1813,6 +1813,23 @@ supporting the variadic arguments e.g. majority of CPU targets. #pragma OPENCL EXTENSION __cl_clang_variadic_functions : disable void bar(int a, ...); // error - variadic prototype is not allowed +Legacy 1.x atomics with generic address space +--------------------------------------------- + +Clang allows use of atomic functions from the OpenCL 1.x standards +with the generic address space pointer in C++ for OpenCL mode. + +This is a non-portable feature and might not be supported by all +targets. + +**Example of Use**: + +.. code-block:: c++ + + void foo(__generic volatile unsigned int* a) { + atomic_add(a, 1); + } + Builtin Functions ================= -- 2.7.4