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Thu, 31 Aug 2023 16:26:47 -0700 (PDT) Message-ID: <9fa6450c-4133-ac8d-05fb-84f6430ae491@linaro.org> Date: Thu, 31 Aug 2023 16:26:46 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH] target/mips: Simplify Loongson MULTU.G opcode To: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , qemu-devel@nongnu.org Cc: Aurelien Jarno , Aleksandar Rikalo , Jiaxun Yang References: <20230831201140.85799-1-philmd@linaro.org> Content-Language: en-US From: Richard Henderson In-Reply-To: <20230831201140.85799-1-philmd@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed 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: -55 X-Spam_score: -5.6 X-Spam_bar: ----- X-Spam_report: (-5.6 / 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, NICE_REPLY_A=-3.478, 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 On 8/31/23 13:11, Philippe Mathieu-Daudé wrote: > Since MULTU opcodes don't record the most significant bits > of the infinite result, sign-extending the sources make no > difference in the result. > > Once we remove the sign extension of source registers, MULT > and MULTU are identical (as are DMULT and DMULTU). > > Suggested-by: Richard Henderson > Signed-off-by: Philippe Mathieu-Daudé > --- > target/mips/tcg/translate.c | 2 -- > 1 file changed, 2 deletions(-) Reviewed-by: Richard Henderson r~