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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id jc20-20020a17090325d400b001d403969b65sm4588056plb.187.2024.01.08.05.48.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jan 2024 05:48:04 -0800 (PST) From: Kito Cheng To: gcc-patches@gcc.gnu.org, kito.cheng@gmail.com, jim.wilson.gcc@gmail.com, palmer@dabbelt.com, andrew@sifive.com, jeffreyalaw@gmail.com, christoph.muellner@vrull.eu Cc: Kito Cheng Subject: [PATCH 5/5] RISC-V: Document the syntax of -march Date: Mon, 8 Jan 2024 21:47:38 +0800 Message-Id: <20240108134738.998804-6-kito.cheng@sifive.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240108134738.998804-1-kito.cheng@sifive.com> References: <20240108134738.998804-1-kito.cheng@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: --- gcc/doc/invoke.texi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 68d1f364ac0..81ee7ac758a 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -30037,6 +30037,22 @@ Generate code for given RISC-V ISA (e.g.@: @samp{rv64im}). ISA strings must be lower-case. Examples include @samp{rv64i}, @samp{rv32g}, @samp{rv32e}, and @samp{rv32imaf}. +The syntax of the ISA string is defined as follows: + +@table @code +@item The string must start with @samp{rv32} or @samp{rv64}, followed by +@samp{i}, @samp{e}, or @samp{g}, referred to as the base ISA. +@item The subsequent part of the string is a list of extension names. Extension +names can be categorized as multi-letter (e.g.@: @samp{zba}) and single-letter +(e.g.@: @samp{v}). Single-letter extensions can appear consecutively, +but multi-letter extensions must be separated by underscores. +@item An underscore can appear anywhere after the base ISA. It has no specific +effect but is used to improve readability and can act as a separator. +@item Extension names may include an optional version number, following the +syntax @samp{p} or @samp{}, (e.g.@: @samp{m2p1} or +@samp{m2}). +@end table + When @option{-march=} is not specified, use the setting from @option{-mcpu}. If both @option{-march} and @option{-mcpu=} are not specified, the default for -- 2.34.1