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Tue, 06 Apr 2021 18:25:06 -0700 (PDT) Received: from [192.168.1.11] ([71.212.131.83]) by smtp.gmail.com with ESMTPSA id j1sm3001239pjn.26.2021.04.06.18.25.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Apr 2021 18:25:06 -0700 (PDT) Subject: Re: [PATCH 02/27] arc: Decoder code To: cupertinomiranda@gmail.com, qemu-devel@nongnu.org References: <20210405143138.17016-1-cupertinomiranda@gmail.com> <20210405143138.17016-3-cupertinomiranda@gmail.com> From: Richard Henderson Message-ID: <44722d06-8fe2-0d9b-9b42-1442c5625aa0@linaro.org> Date: Tue, 6 Apr 2021 18:25:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <20210405143138.17016-3-cupertinomiranda@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::531; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x531.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, NICE_REPLY_A=-0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: shahab@synopsys.com, linux-snps-arc@lists.infradead.org, claziss@synopsys.com, cmiranda@synopsys.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 4/5/21 7:31 AM, cupertinomiranda@gmail.com wrote: > +static long long int > +extract_uimm6_20(unsigned long long insn ATTRIBUTE_UNUSED, global replace long long int with int64_t, and unsigned long long int with uint64_t. > +{ > + unsigned value = 0; > + > + value |= ((insn >> 6) & 0x003f) << 0; > + > + return value; > +} return extract64(insn, 6, 6); and so forth. Please minimize the by-hand bit manipulation. > +static const struct arc_opcode *find_format(insn_t *pinsn, > + uint64_t insn, > + uint8_t insn_len, > + uint32_t isa_mask) > +{ > + uint32_t i = 0; > + const struct arc_opcode *opcode = NULL; > + const uint8_t *opidx; > + const uint8_t *flgidx; > + bool has_limm = false; > + > + do { > + bool invalid = false; > + uint32_t noperands = 0; > + > + opcode = &arc_opcodes[i++]; > + memset(pinsn, 0, sizeof(*pinsn)); > + > + if (!(opcode->cpu & isa_mask)) { > + continue; > + } > + > + if (arc_opcode_len(opcode) != (int) insn_len) { > + continue; > + } > + > + if ((insn & opcode->mask) != opcode->opcode) { > + continue; > + } A linear search through the entire opcode table, really? You can do better. Before you re-invent the wheel, please first have a look at docs/devel/decodetree.rst. I see no reason why you can't take those tables that you import your tables from binutils, as you're doing now, and then have a small program that converts to decodetree at build-time. r~