llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang Author: Pavel Iliin (ilinpv) <details> <summary>Changes</summary> --- Full diff: https://github.com/llvm/llvm-project/pull/84098.diff 1 Files Affected: - (modified) clang/docs/LanguageExtensions.rst (+28) ``````````diff diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst index bcd69198eafdbe..f939d1c765e91a 100644 --- a/clang/docs/LanguageExtensions.rst +++ b/clang/docs/LanguageExtensions.rst @@ -2799,6 +2799,34 @@ counter's true frequency will need to be provided by the user. Query for this feature with ``__has_builtin(__builtin_readsteadycounter)``. +``__builtin_cpu_supports`` +-------------------------- + +**Syntax**: + +.. code-block:: c++ + + int __builtin_cpu_supports(const char *features); + +**Example of Use:**: + +.. code-block:: c++ + + if (__builtin_cpu_supports("sve")) + sve_code(); + +**Description**: + +The ``__builtin_cpu_supports`` function detects at runtime if target CPU +supports features specified in string argument. It returns positive integer +if all features are supported and 0 otherwise. Names of features and format is +target specific. For example on AArch64 features are combined using ``+`` like +this ``__builtin_cpu_supports("flagm+sha3+lse+rcpc2+fcma+memtag+bti+sme2")``. +If feature name is not supported or format is wrong, compiler will issue a +warning and replace builtin by constant 0. + +Query for this feature with ``__has_builtin(__builtin_cpu_supports)``. + ``__builtin_dump_struct`` ------------------------- `````````` </details> https://github.com/llvm/llvm-project/pull/84098 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits