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Thu, 12 Jan 2023 04:26:45 +0000 Received: by smtphe5006.mail.kks.ynwp.yahoo.co.jp (YJ Hermes SMTP Server) with ESMTPA ID 4af41384d4fe308683cd1350d1b18f61; Thu, 12 Jan 2023 13:26:44 +0900 (JST) Message-ID: Date: Thu, 12 Jan 2023 13:26:42 +0900 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 To: GCC Patches Cc: Max Filippov Subject: [PATCH 2/2] xtensa: Optimize ctzsi2 and ffssi2 a bit References: X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP 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: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Takayuki 'January June' Suwa via Gcc-patches From: Takayuki 'January June' Suwa Reply-To: Takayuki 'January June' Suwa Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org Sender: "Gcc-patches" X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754789493604305332?= X-GMAIL-MSGID: =?utf-8?q?1754789493604305332?= This patch saves one byte when the Code Density Option is enabled, gcc/ChangeLog: * config/xtensa/xtensa.md (ctzsi2, ffssi2): Rearrange the emitting codes. --- gcc/config/xtensa/xtensa.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md index b4989832169..764da63f91c 100644 --- a/gcc/config/xtensa/xtensa.md +++ b/gcc/config/xtensa/xtensa.md @@ -477,8 +477,8 @@ emit_insn (gen_negsi2 (temp, operands[1])); emit_insn (gen_andsi3 (temp, temp, operands[1])); emit_insn (gen_clzsi2 (temp, temp)); - emit_insn (gen_negsi2 (temp, temp)); - emit_insn (gen_addsi3 (operands[0], temp, GEN_INT (31))); + emit_move_insn (operands[0], GEN_INT (31)); + emit_insn (gen_subsi3 (operands[0], operands[0], temp)); DONE; }) @@ -491,8 +491,8 @@ emit_insn (gen_negsi2 (temp, operands[1])); emit_insn (gen_andsi3 (temp, temp, operands[1])); emit_insn (gen_clzsi2 (temp, temp)); - emit_insn (gen_negsi2 (temp, temp)); - emit_insn (gen_addsi3 (operands[0], temp, GEN_INT (32))); + emit_move_insn (operands[0], GEN_INT (32)); + emit_insn (gen_subsi3 (operands[0], operands[0], temp)); DONE; })