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([2a01:4f9:3a:1e26::2]) by smtp.gmail.com with ESMTPSA id v21-20020a50d595000000b004aaa09d50adsm4742249edi.94.2023.02.07.06.39.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Feb 2023 06:39:50 -0800 (PST) From: Philipp Tomsich To: qemu-devel@nongnu.org Cc: Kito Cheng , Christoph Muellner , Richard Henderson , Alistair Francis , Philipp Tomsich Subject: [PATCH v3 1/2] target/riscv: add Zicond as an experimental extension Date: Tue, 7 Feb 2023 15:39:43 +0100 Message-Id: <20230207143944.1883400-1-philipp.tomsich@vrull.eu> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::529; envelope-from=philipp.tomsich@vrull.eu; helo=mail-ed1-x529.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, 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This implements the Zicond (conditional integer operations) extension, as of version 1.0-draft-20230120 as an experimental extension in QEMU ("x-zicond"). The Zicond extension acts as a building block for branchless sequences including conditional-{arithmetic,logic,select,move}. Refer to the specification for usage scenarios and application guidance. The following instructions constitute Zicond: - czero.eqz rd, rs1, rs2 => rd = (rs2 == 0) ? 0 : rs1 - czero.nez rd, rs1, rs2 => rd = (rs2 != 0) ? 0 : rs1 See https://github.com/riscv/riscv-zicond/releases/download/v1.0-draft-20230120/riscv-zicond_1.0-draft-20230120.pdf for the (current version of the) Zicond specification and usage details. Signed-off-by: Philipp Tomsich --- Changes in v3: - don't add this to MAINTAINERS, as it is an official extension Changes in v2: - gates availability of the instructions through a REQUIRE_ZICOND macro (these were previously always enabled) target/riscv/cpu.c | 4 ++ target/riscv/cpu.h | 1 + target/riscv/insn32.decode | 4 ++ target/riscv/insn_trans/trans_rvzicond.c.inc | 54 ++++++++++++++++++++ target/riscv/translate.c | 1 + 5 files changed, 64 insertions(+) create mode 100644 target/riscv/insn_trans/trans_rvzicond.c.inc diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 14a7027095..98177d8328 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -73,6 +73,7 @@ struct isa_ext_data { static const struct isa_ext_data isa_edata_arr[] = { ISA_EXT_DATA_ENTRY(h, false, PRIV_VERSION_1_12_0, ext_h), ISA_EXT_DATA_ENTRY(v, false, PRIV_VERSION_1_12_0, ext_v), + ISA_EXT_DATA_ENTRY(zicond, true, PRIV_VERSION_1_12_0, ext_zicond), ISA_EXT_DATA_ENTRY(zicsr, true, PRIV_VERSION_1_10_0, ext_icsr), ISA_EXT_DATA_ENTRY(zifencei, true, PRIV_VERSION_1_10_0, ext_ifencei), ISA_EXT_DATA_ENTRY(zihintpause, true, PRIV_VERSION_1_10_0, ext_zihintpause), @@ -1097,6 +1098,9 @@ static Property riscv_cpu_extensions[] = { DEFINE_PROP_BOOL("x-smaia", RISCVCPU, cfg.ext_smaia, false), DEFINE_PROP_BOOL("x-ssaia", RISCVCPU, cfg.ext_ssaia, false), + /* Zicond 1.0-draft-20230120 */ + DEFINE_PROP_BOOL("x-zicond", RISCVCPU, cfg.ext_zicond, false), + DEFINE_PROP_END_OF_LIST(), }; diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index bcf0826753..aaf3acb753 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -446,6 +446,7 @@ struct RISCVCPUConfig { bool ext_zkt; bool ext_ifencei; bool ext_icsr; + bool ext_zicond; bool ext_zihintpause; bool ext_smstateen; bool ext_sstc; diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode index b7e7613ea2..ca812c2f7a 100644 --- a/target/riscv/insn32.decode +++ b/target/riscv/insn32.decode @@ -890,3 +890,7 @@ sm3p1 00 01000 01001 ..... 001 ..... 0010011 @r2 # *** RV32 Zksed Standard Extension *** sm4ed .. 11000 ..... ..... 000 ..... 0110011 @k_aes sm4ks .. 11010 ..... ..... 000 ..... 0110011 @k_aes + +# *** Zicond Standard Extension *** +czero_eqz 0000111 ..... ..... 101 ..... 0110011 @r +czero_nez 0000111 ..... ..... 111 ..... 0110011 @r diff --git a/target/riscv/insn_trans/trans_rvzicond.c.inc b/target/riscv/insn_trans/trans_rvzicond.c.inc new file mode 100644 index 0000000000..20e9694a2c --- /dev/null +++ b/target/riscv/insn_trans/trans_rvzicond.c.inc @@ -0,0 +1,54 @@ +/* + * RISC-V translation routines for the XVentanaCondOps extension. + * + * Copyright (c) 2022 VRULL GmbH. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + */ + +#define REQUIRE_ZICOND(ctx) do { \ + if (!ctx->cfg_ptr->ext_zicond) { \ + return false; \ + } \ +} while (0) + +/* Emits "$rd = ($rs2 $zero) ? $zero : $rs1" */ +static inline void gen_czero(TCGv dest, TCGv src1, TCGv src2, TCGCond cond) +{ + TCGv zero = tcg_constant_tl(0); + tcg_gen_movcond_tl(cond, dest, src2, zero, zero, src1); +} + +static inline void gen_czero_eqz(TCGv dest, TCGv src1, TCGv src2) +{ + gen_czero(dest, src1, src2, TCG_COND_EQ); +} + +static inline void gen_czero_nez(TCGv dest, TCGv src1, TCGv src2) +{ + gen_czero(dest, src1, src2, TCG_COND_NE); +} + +static bool trans_czero_eqz(DisasContext *ctx, arg_r *a) +{ + REQUIRE_ZICOND(ctx); + + return gen_logic(ctx, a, gen_czero_eqz); +} + +static bool trans_czero_nez(DisasContext *ctx, arg_r *a) +{ + REQUIRE_ZICOND(ctx); + + return gen_logic(ctx, a, gen_czero_nez); +} diff --git a/target/riscv/translate.c b/target/riscv/translate.c index 01cc30a365..93850938ae 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -1076,6 +1076,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc) #include "insn_trans/trans_rvv.c.inc" #include "insn_trans/trans_rvb.c.inc" #include "insn_trans/trans_rvzawrs.c.inc" +#include "insn_trans/trans_rvzicond.c.inc" #include "insn_trans/trans_rvzfh.c.inc" #include "insn_trans/trans_rvk.c.inc" #include "insn_trans/trans_privileged.c.inc"