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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c24591dc662sm456537966b.42.2026.08.21.06.07.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Aug 2026 06:07:45 -0700 (PDT) Message-ID: Date: Fri, 21 Aug 2026 15:07:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH 1/4] x86/APX: handle EVEX.V4 in build_evex_prefix() From: Jan Beulich To: Binutils Cc: "H.J. Lu" References: Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: X-Spam-Status: No, score=-3015.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NONE, TXREP shortcircuit=no autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on sourceware.org X-BeenThere: binutils@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Binutils mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: binutils-bounces~patchwork=sourceware.org@sourceware.org There's no need to defer to the more expensive build_apx_evex_prefix(). This way is_apx_evex_encoding() ends up simpler / cheaper as well. --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -4547,9 +4547,7 @@ is_any_vex_encoding (const insn_template static INLINE bool is_apx_evex_encoding (void) { - return i.rex2 || i.tm.opcode_space == SPACE_MAP4 || pp.has_nf - || (i.vex.register_specifier - && (i.vex.register_specifier->reg_flags & RegRex2)); + return i.rex2 || i.tm.opcode_space == SPACE_MAP4 || pp.has_nf; } static INLINE bool @@ -4649,7 +4647,7 @@ build_evex_prefix (void) register_specifier += 8; /* The upper 16 registers are encoded in the fourth byte of the EVEX prefix. */ - if (!(i.vex.register_specifier->reg_flags & RegVRex)) + if (!(i.vex.register_specifier->reg_flags & (RegVRex | RegRex2))) i.vex.bytes[3] = 0x8; register_specifier = ~register_specifier & 0xf; } @@ -4879,9 +4877,6 @@ build_apx_evex_prefix (bool force_nd) gas_assert (i.rm.mode != 3); i.vex.bytes[2] &= ~0x04; } - if (i.vex.register_specifier - && i.vex.register_specifier->reg_flags & RegRex2) - i.vex.bytes[3] &= ~0x08; /* Encode the NDD bit of the instruction promoted from the legacy space. ZU shares the same bit with NDD. */