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([2804:14d:8084:92c5::1001]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b2a5ef4396sm7038136d6.122.2024.06.13.07.04.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Jun 2024 07:04:16 -0700 (PDT) Message-ID: Date: Thu, 13 Jun 2024 11:04:12 -0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Question about YMM register availability in x86 CPUs To: "Willgerodt, Felix" , "gdb@sourceware.org" References: <1ea5f9b9-3e73-4d51-ae77-fe0d1f77a161@redhat.com> In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-5.3 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, 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 X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Guinevere Larsen via Gdb Reply-To: Guinevere Larsen Errors-To: gdb-bounces+public-inbox=simark.ca@sourceware.org Sender: "Gdb" On 6/13/24 10:19 AM, Willgerodt, Felix wrote: >> -----Original Message----- >> From: Gdb On Behalf >> Of Guinevere Larsen via Gdb >> Sent: Mittwoch, 12. Juni 2024 22:31 >> To: gdb@sourceware.org >> Subject: Question about YMM register availability in x86 CPUs >> >> Hello gdb list! >> >> TL;DR: Is it reasonable to assume that all x86 CPUs that have AVX >> capabilities will have both XMM and YMM registers? >> > Hi Guinivere, > > The Intel Software Development Manual tells you about AVX > in Volume 1, Chapter 14.1.1: > > "Intel AVX introduces support for 256-bit wide SIMD registers (YMM0-YMM7 > in operating modes that are 32-bit or less, YMM0-YMM15 in 64-bit mode). > The lower 128-bits of the YMM registers are aliased to the respective 128-bit > XMM registers" > > In chapter 14.6.1 it tells you what AVX2 added. It is just extending old > instructions to 256 bit and adding new ones. No new register space. > > So I think yes it is reasonable to assume that. > Hi Felix, Thank you for confirming this for me! I'll keep this in mind for future AVX recording development. -- Cheers, Guinevere Larsen She/Her/Hers