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[97.126.123.70]) by smtp.gmail.com with ESMTPSA id c83sm6772831pfb.44.2020.03.20.19.42.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Mar 2020 19:42:38 -0700 (PDT) To: gcc-patches@gcc.gnu.org Subject: [PATCH v2 4/9] aarch64: Add cmp_carryinC_m2 Date: Fri, 20 Mar 2020 19:42:26 -0700 Message-Id: <20200321024231.13778-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200321024231.13778-1-richard.henderson@linaro.org> References: <20200321024231.13778-1-richard.henderson@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-26.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) 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: Richard Henderson via Gcc-patches From: "Li, Pan2 via Gcc-patches" Reply-To: Richard Henderson Cc: richard.earnshaw@arm.com, Wilco.Dijkstra@arm.com, marcus.shawcroft@arm.com Errors-To: gcc-patches-bounces@gcc.gnu.org Sender: "Gcc-patches" Combine will fold immediate -1 differently than the other *cmp*_carryinC* patterns. In this case we can use adcs with an xzr input, and it occurs frequently when comparing 128-bit values to small negative constants. * config/aarch64/aarch64.md (cmp_carryinC_m2): New. --- gcc/config/aarch64/aarch64.md | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md index 9b1c3f797f9..076158b0071 100644 --- a/gcc/config/aarch64/aarch64.md +++ b/gcc/config/aarch64/aarch64.md @@ -3452,6 +3452,7 @@ "" ) +;; Substituting zero into the first input operand. (define_insn "*usub3_carryinC_z1" [(set (reg:CC CC_REGNUM) (compare:CC @@ -3482,6 +3483,7 @@ [(set_attr "type" "adc_reg")] ) +;; Substituting zero into the second input operand. (define_insn "*usub3_carryinC_z2" [(set (reg:CC CC_REGNUM) (compare:CC @@ -3508,6 +3510,19 @@ [(set_attr "type" "adc_reg")] ) +;; Substituting -1 into the second input operand. +(define_insn "*cmp3_carryinC_m2" + [(set (reg:CC CC_REGNUM) + (compare:CC + (neg: + (match_operand: 1 "aarch64_carry_operation" "")) + (ANY_EXTEND: + (match_operand:GPI 0 "register_operand" "r"))))] + "" + "adcs\\tzr, %0, zr" + [(set_attr "type" "adc_reg")] +) + (define_insn "*usub3_carryinC" [(set (reg:CC CC_REGNUM) (compare:CC