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[122.150.204.179]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-24905da4784sm39551685ad.90.2025.08.29.20.39.30 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Aug 2025 20:39:32 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 0/5] tcg/i386: Improve vector shifts Date: Sat, 30 Aug 2025 13:39:21 +1000 Message-ID: <20250830033926.372955-1-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org x86 doesn't directly support 8-bit vector shifts, so we have some 2 to 5 insn expansions. With VGF2P8AFFINEQB, we can do it in 1 insn, plus a (possibly shared) constant load. Changes for v2: - Use PCMPGT for arithmetic right-shift of bits-1 (paolo). - Tidy an instance of non-canonical operand ordering. r~ Richard Henderson (5): cpuinfo/i386: Detect GFNI as an AVX extension tcg/i386: Expand sari of bits-1 as pcmpgt tcg/i386: Use canonical operand ordering in expand_vec_sari tcg/i386: Add INDEX_op_x86_vgf2p8affineqb_vec tcg/i386: Use vgf2p8affineqb for MO_8 vector shifts host/include/i386/host/cpuinfo.h | 1 + include/qemu/cpuid.h | 3 ++ util/cpuinfo-i386.c | 1 + tcg/i386/tcg-target-opc.h.inc | 1 + tcg/i386/tcg-target.c.inc | 91 +++++++++++++++++++++++++++++--- 5 files changed, 91 insertions(+), 6 deletions(-) -- 2.43.0