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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B9F.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB9647 X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, FORGED_SPF_HELO, GIT_PATCH_0, KAM_DMARC_NONE, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Hi All, This documents the behavior of the generic CPU options on AArch64. Bootstrapped Regtested on aarch64-none-linux-gnu and no issues. Ok for master? Thanks, Tamar gcc/ChangeLog: * doc/invoke.texi (generic): Update defintion. (generic-armv8-a, generic-armv9-a): Document. --- inline copy of patch -- diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index d0b55fb106f908e8222394bbd07670aa583c5680..77684c5d7c9c0bdd587250acc190da81e0f7f032 100644 --- diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index d0b55fb106f908e8222394bbd07670aa583c5680..77684c5d7c9c0bdd587250acc190da81e0f7f032 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -20759,7 +20759,8 @@ processors implementing the target architecture. @item -mtune=@var{name} Specify the name of the target processor for which GCC should tune the performance of the code. Permissible values for this option are: -@samp{generic}, @samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a55}, +@samp{generic}, @samp{generic-armv8-a}, @samp{generic-armv9-a}, +@samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a55}, @samp{cortex-a57}, @samp{cortex-a72}, @samp{cortex-a73}, @samp{cortex-a75}, @samp{cortex-a76}, @samp{cortex-a76ae}, @samp{cortex-a77}, @samp{cortex-a65}, @samp{cortex-a65ae}, @samp{cortex-a34}, @@ -20798,6 +20799,11 @@ arithmetic instructions per cycle (2 for 256-bit SVE, 4 for 128-bit SVE). This is more general than tuning for a specific core like Neoverse V1 but is more specific than the default tuning described below. +The value @samp{generic} should not be assumed to be a static configuration. +Starting with GCC 14 this value can change over time in order to better reflect +advancements in CPU microarchitecture. If a specific version is required you are encouraged +to use one of the architecture specific generic processors, e.g. @samp{generic-armv8-a}. + Additionally on native AArch64 GNU/Linux systems the value @samp{native} tunes performance to the host system. This option has no effect if the compiler is unable to recognize the processor of the host system. --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -20759,7 +20759,8 @@ processors implementing the target architecture. @item -mtune=@var{name} Specify the name of the target processor for which GCC should tune the performance of the code. Permissible values for this option are: -@samp{generic}, @samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a55}, +@samp{generic}, @samp{generic-armv8-a}, @samp{generic-armv9-a}, +@samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a55}, @samp{cortex-a57}, @samp{cortex-a72}, @samp{cortex-a73}, @samp{cortex-a75}, @samp{cortex-a76}, @samp{cortex-a76ae}, @samp{cortex-a77}, @samp{cortex-a65}, @samp{cortex-a65ae}, @samp{cortex-a34}, @@ -20798,6 +20799,11 @@ arithmetic instructions per cycle (2 for 256-bit SVE, 4 for 128-bit SVE). This is more general than tuning for a specific core like Neoverse V1 but is more specific than the default tuning described below. +The value @samp{generic} should not be assumed to be a static configuration. +Starting with GCC 14 this value can change over time in order to better reflect +advancements in CPU microarchitecture. If a specific version is required you are encouraged +to use one of the architecture specific generic processors, e.g. @samp{generic-armv8-a}. + Additionally on native AArch64 GNU/Linux systems the value @samp{native} tunes performance to the host system. This option has no effect if the compiler is unable to recognize the processor of the host system.