https://github.com/ilinpv created
https://github.com/llvm/llvm-project/pull/84098
None
>From 528af71d043d306a4aeb5c448a0780fa42644c15 Mon Sep 17 00:00:00 2001
From: Pavel Iliin <pavel.il...@arm.com>
Date: Wed, 6 Mar 2024 00:23:36 +0000
Subject: [PATCH] [NFC][Docs] Documenting __builtin_cpu_supports.
---
clang/docs/LanguageExtensions.rst | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
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``
-------------------------
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