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[149.172.150.237]) by smtp.gmail.com with ESMTPSA id v20-20020a170906489400b009adc77fe164sm6833759ejq.66.2023.12.05.07.13.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Dec 2023 07:13:23 -0800 (PST) Message-ID: <6e9a07e9-7b5b-40f7-8a7f-e2abcc37e283@gmail.com> Date: Tue, 5 Dec 2023 16:13:22 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: rdapp.gcc@gmail.com Content-Language: en-US To: gcc-patches , palmer , Kito Cheng , jeffreyalaw , "juzhe.zhong@rivai.ai" From: Robin Dapp Subject: [PATCH] RISC-V: Add vec_init expander for masks [PR112854]. X-Spam-Status: No, score=-9.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE 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: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784455346900892730 X-GMAIL-MSGID: 1784455346900892730 Hi, PR112854 shows a problem on rv32 with zvl1024b. During the course of expand_constructor we try to overlay/subreg a 64-element mask by a scalar (Pmode) register. This works for zvle512b and its maximum of 32 elements but fails for rv32 and 64 elements. To circumvent this this patch adds a vec_init expander for vector masks by initializing a QImode vector and comparing that against 0. This also ensures we don't do element initialization of masks. Regards Robin gcc/ChangeLog: PR target/112854 * config/riscv/autovec.md (vec_initqi): New expander. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/autovec/pr112854.c: New test. --- gcc/config/riscv/autovec.md | 16 ++++++++++++++++ .../gcc.target/riscv/rvv/autovec/pr112854.c | 12 ++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112854.c diff --git a/gcc/config/riscv/autovec.md b/gcc/config/riscv/autovec.md index 3c4d68367f0..65ab76b3e0c 100644 --- a/gcc/config/riscv/autovec.md +++ b/gcc/config/riscv/autovec.md @@ -394,6 +394,22 @@ (define_expand "vec_init" } ) +;; Provide a vec_init for mask registers by initializing +;; a QImode vector and comparing it against 0. +(define_expand "vec_initqi" + [(match_operand:VB 0 "register_operand") + (match_operand 1 "")] + "TARGET_VECTOR" + { + machine_mode qimode = riscv_vector::get_vector_mode + (QImode, GET_MODE_NUNITS (mode)).require (); + rtx tmp = gen_reg_rtx (qimode); + riscv_vector::expand_vec_init (tmp, operands[1]); + riscv_vector::expand_vec_cmp (operands[0], NE, tmp, CONST0_RTX (qimode)); + DONE; + } +) + ;; Slide an RVV vector left and insert a scalar into element 0. (define_expand "vec_shl_insert_" [(match_operand:VI 0 "register_operand") diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112854.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112854.c new file mode 100644 index 00000000000..8f7f13f9dc1 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/pr112854.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-options "-march=rv32gcv_zvl1024b -mabi=ilp32d --param=riscv-autovec-preference=fixed-vlmax" } */ + +short a, b; +void c(int d) { + for (; a; a--) { + b = 0; + for (; b <= 8; b++) + if (d) + break; + } +}