From patchwork Sat Sep 4 20:35:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Tomsich X-Patchwork-Id: 1524657 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=vrull-eu.20150623.gappssmtp.com header.i=@vrull-eu.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=J+X/Oahd; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4H26H063F7z9sR4 for ; Sun, 5 Sep 2021 06:49:48 +1000 (AEST) Received: from localhost ([::1]:55322 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMcbi-000520-6l for incoming@patchwork.ozlabs.org; Sat, 04 Sep 2021 16:49:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54444) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mMcO1-00063U-Pm for qemu-devel@nongnu.org; Sat, 04 Sep 2021 16:35:37 -0400 Received: from mail-lf1-x133.google.com ([2a00:1450:4864:20::133]:35545) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mMcNw-0002yh-Bo for qemu-devel@nongnu.org; Sat, 04 Sep 2021 16:35:37 -0400 Received: by mail-lf1-x133.google.com with SMTP id k13so5373012lfv.2 for ; Sat, 04 Sep 2021 13:35:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vrull-eu.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=D/PR4KybwFYEcV2Wqnr+C/gdpOXd3FlzLBUedNaXmFM=; b=J+X/OahdSKDmlKCEWR/TbTgfBCz49yTUB3GB2+N1w0fRMVPXSWnV8pPeLE7u5hTIQ1 Pz2FEHcpQma7WjOcVSVl5S7yiHv2elk+EckG9pv3dTa+BTa6V6kEUdOnSp2SFUdxW1+8 l95CWOD53llgBoL/FDlYOHMHW7TpRbUh4IWX8uDxktD4rRBbMVOAb41nTz6vfJrBQA+R yUw4TH3ibZjpW2NpbURwLwbEimfTf7eDBoCKfc2laT8+Ssbp1xP4RmzJuHUcwD2JwtWG 8wWDlY8ypcgmaSzTDev6ic5GZkqR7YvYP/k4pDHKnwqgk8zFyEQsWNiFUnwL1/AwrsA7 Lyvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=D/PR4KybwFYEcV2Wqnr+C/gdpOXd3FlzLBUedNaXmFM=; b=l6Lo2kRBlpgBMLvOL+FTt7MYLQN/L+h15caKTi55E7oPSQFfnJg51L0kJeOY0ATv/R EiTcK0yHQgNi24tSEFhmjE0aWshW9g4w1cUmPRFkO7266BRaxIM2LFmt5VaxGlLfIdh9 xKWDE5jtNfHI1uWrQGnUrMpgvgxLKmLkYXt2Jo3+FBP6ZPDFNThLfkJ+IdkUH6w4/eeJ V0bgfl6463oaMklKUqxEK0+GQ2p5ij3+lRNzWz7tzU05YO+TDO5ZjmneokdqYci7Zyiw JCiWelJyerh/vHbVDOHY6vmQ5dztFTJdeacADd/EX2tzk5H72SMjQNAiKSDeGoMx2s6/ fpTA== X-Gm-Message-State: AOAM5302CmpzGxjLfyTS35lcqDlplIPEGTYR1JtYzpOaWkBz40mcx4Pk SX59zR2KCJgc4ZSr2Ffq3Xs2/3emgbgIPEbMNhY= X-Google-Smtp-Source: ABdhPJzQzOBT4KsyvoF+N2KDWnPnERHW5N5hgVsnWtgyq6gWqslnvkZ6K3VY5M/BeJlLeKBDYHX28w== X-Received: by 2002:ac2:4d17:: with SMTP id r23mr4207127lfi.234.1630787729254; Sat, 04 Sep 2021 13:35:29 -0700 (PDT) Received: from localhost.localdomain ([2a01:4f9:3a:1e26::2]) by smtp.gmail.com with ESMTPSA id v15sm326304lfq.142.2021.09.04.13.35.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Sep 2021 13:35:29 -0700 (PDT) From: Philipp Tomsich To: qemu-devel@nongnu.org Subject: [PATCH v10 13/16] target/riscv: Add rev8 instruction, removing grev/grevi Date: Sat, 4 Sep 2021 22:35:12 +0200 Message-Id: <20210904203516.2570119-14-philipp.tomsich@vrull.eu> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210904203516.2570119-1-philipp.tomsich@vrull.eu> References: <20210904203516.2570119-1-philipp.tomsich@vrull.eu> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::133; envelope-from=philipp.tomsich@vrull.eu; helo=mail-lf1-x133.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , Kito Cheng , Alistair Francis , Philipp Tomsich Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The 1.0.0 version of Zbb does not contain grev/grevi. Instead, a rev8 instruction (equivalent to the rev8 pseudo-instruction built on grevi from pre-0.93 draft-B) is available. This commit adds the new rev8 instruction and removes grev/grevi. Note that there is no W-form of this instruction (both a sign-extending and zero-extending 32-bit version can easily be synthesized by following rev8 with either a srai or srli instruction on RV64) and that the opcode encodings for rev8 in RV32 and RV64 are different. Signed-off-by: Philipp Tomsich Reviewed-by: Richard Henderson Reviewed-by: Alistair Francis --- (no changes since v9) Changes in v9: - Rebased to 8880cc4362. - Fixes a whitespace-at-the-end-of-line warning for the rev8 comment in insn32.decode Changes in v4: - reorder trans_rev8* functions to be sequential - rename rev8 to rev8_32 in decoder Changes in v3: - rev8-addition & grevi*-removal moved to a separate commit target/riscv/bitmanip_helper.c | 40 ------------------------- target/riscv/helper.h | 2 -- target/riscv/insn32.decode | 12 ++++---- target/riscv/insn_trans/trans_rvb.c.inc | 40 +++++-------------------- 4 files changed, 15 insertions(+), 79 deletions(-) diff --git a/target/riscv/bitmanip_helper.c b/target/riscv/bitmanip_helper.c index bb48388fcd..f1b5e5549f 100644 --- a/target/riscv/bitmanip_helper.c +++ b/target/riscv/bitmanip_helper.c @@ -24,46 +24,6 @@ #include "exec/helper-proto.h" #include "tcg/tcg.h" -static const uint64_t adjacent_masks[] = { - dup_const(MO_8, 0x55), - dup_const(MO_8, 0x33), - dup_const(MO_8, 0x0f), - dup_const(MO_16, 0xff), - dup_const(MO_32, 0xffff), - UINT32_MAX -}; - -static inline target_ulong do_swap(target_ulong x, uint64_t mask, int shift) -{ - return ((x & mask) << shift) | ((x & ~mask) >> shift); -} - -static target_ulong do_grev(target_ulong rs1, - target_ulong rs2, - int bits) -{ - target_ulong x = rs1; - int i, shift; - - for (i = 0, shift = 1; shift < bits; i++, shift <<= 1) { - if (rs2 & shift) { - x = do_swap(x, adjacent_masks[i], shift); - } - } - - return x; -} - -target_ulong HELPER(grev)(target_ulong rs1, target_ulong rs2) -{ - return do_grev(rs1, rs2, TARGET_LONG_BITS); -} - -target_ulong HELPER(grevw)(target_ulong rs1, target_ulong rs2) -{ - return do_grev(rs1, rs2, 32); -} - target_ulong HELPER(clmul)(target_ulong rs1, target_ulong rs2) { target_ulong result = 0; diff --git a/target/riscv/helper.h b/target/riscv/helper.h index a9bda2c8ac..c7a5376227 100644 --- a/target/riscv/helper.h +++ b/target/riscv/helper.h @@ -59,8 +59,6 @@ DEF_HELPER_FLAGS_2(fcvt_d_lu, TCG_CALL_NO_RWG, i64, env, tl) DEF_HELPER_FLAGS_1(fclass_d, TCG_CALL_NO_RWG_SE, tl, i64) /* Bitmanip */ -DEF_HELPER_FLAGS_2(grev, TCG_CALL_NO_RWG_SE, tl, tl, tl) -DEF_HELPER_FLAGS_2(grevw, TCG_CALL_NO_RWG_SE, tl, tl, tl) DEF_HELPER_FLAGS_2(clmul, TCG_CALL_NO_RWG_SE, tl, tl, tl) DEF_HELPER_FLAGS_2(clmulr, TCG_CALL_NO_RWG_SE, tl, tl, tl) diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode index 59202196dc..901a66c0f5 100644 --- a/target/riscv/insn32.decode +++ b/target/riscv/insn32.decode @@ -683,6 +683,9 @@ min 0000101 .......... 100 ..... 0110011 @r minu 0000101 .......... 101 ..... 0110011 @r orc_b 001010 000111 ..... 101 ..... 0010011 @r2 orn 0100000 .......... 110 ..... 0110011 @r +# The encoding for rev8 differs between RV32 and RV64. +# rev8_32 denotes the RV32 variant. +rev8_32 011010 011000 ..... 101 ..... 0010011 @r2 rol 0110000 .......... 001 ..... 0110011 @r ror 0110000 .......... 101 ..... 0110011 @r rori 01100 ............ 101 ..... 0010011 @sh @@ -694,6 +697,10 @@ xnor 0100000 .......... 100 ..... 0110011 @r clzw 0110000 00000 ..... 001 ..... 0011011 @r2 ctzw 0110000 00001 ..... 001 ..... 0011011 @r2 cpopw 0110000 00010 ..... 001 ..... 0011011 @r2 +# The encoding for rev8 differs between RV32 and RV64. +# When executing on RV64, the encoding used in RV32 is an illegal +# instruction, so we use different handler functions to differentiate. +rev8_64 011010 111000 ..... 101 ..... 0010011 @r2 rolw 0110000 .......... 001 ..... 0111011 @r roriw 0110000 .......... 101 ..... 0011011 @sh5 rorw 0110000 .......... 101 ..... 0111011 @r @@ -702,15 +709,10 @@ rorw 0110000 .......... 101 ..... 0111011 @r pack 0000100 .......... 100 ..... 0110011 @r packu 0100100 .......... 100 ..... 0110011 @r packh 0000100 .......... 111 ..... 0110011 @r -grev 0110100 .......... 101 ..... 0110011 @r -grevi 01101. ........... 101 ..... 0010011 @sh # *** RV64B Standard Extension (in addition to RV32B) *** packw 0000100 .......... 100 ..... 0111011 @r packuw 0100100 .......... 100 ..... 0111011 @r -grevw 0110100 .......... 101 ..... 0111011 @r - -greviw 0110100 .......... 101 ..... 0011011 @sh5 # *** RV32 Zbc Standard Extension *** clmul 0000101 .......... 001 ..... 0110011 @r diff --git a/target/riscv/insn_trans/trans_rvb.c.inc b/target/riscv/insn_trans/trans_rvb.c.inc index 05102d54b5..6fd1a020b3 100644 --- a/target/riscv/insn_trans/trans_rvb.c.inc +++ b/target/riscv/insn_trans/trans_rvb.c.inc @@ -273,26 +273,18 @@ static bool trans_rol(DisasContext *ctx, arg_rol *a) return gen_shift(ctx, a, EXT_NONE, tcg_gen_rotl_tl); } -static bool trans_grev(DisasContext *ctx, arg_grev *a) +static bool trans_rev8_32(DisasContext *ctx, arg_rev8_32 *a) { - REQUIRE_EXT(ctx, RVB); - return gen_shift(ctx, a, EXT_NONE, gen_helper_grev); -} - -static void gen_grevi(TCGv dest, TCGv src, target_long shamt) -{ - if (shamt == TARGET_LONG_BITS - 8) { - /* rev8, byte swaps */ - tcg_gen_bswap_tl(dest, src); - } else { - gen_helper_grev(dest, src, tcg_constant_tl(shamt)); - } + REQUIRE_32BIT(ctx); + REQUIRE_ZBB(ctx); + return gen_unary(ctx, a, EXT_NONE, tcg_gen_bswap_tl); } -static bool trans_grevi(DisasContext *ctx, arg_grevi *a) +static bool trans_rev8_64(DisasContext *ctx, arg_rev8_64 *a) { - REQUIRE_EXT(ctx, RVB); - return gen_shift_imm_fn(ctx, a, EXT_NONE, gen_grevi); + REQUIRE_64BIT(ctx); + REQUIRE_ZBB(ctx); + return gen_unary(ctx, a, EXT_NONE, tcg_gen_bswap_tl); } static void gen_orc_b(TCGv ret, TCGv source1) @@ -471,22 +463,6 @@ static bool trans_rolw(DisasContext *ctx, arg_rolw *a) return gen_shift(ctx, a, EXT_NONE, gen_rolw); } -static bool trans_grevw(DisasContext *ctx, arg_grevw *a) -{ - REQUIRE_64BIT(ctx); - REQUIRE_EXT(ctx, RVB); - ctx->w = true; - return gen_shift(ctx, a, EXT_ZERO, gen_helper_grev); -} - -static bool trans_greviw(DisasContext *ctx, arg_greviw *a) -{ - REQUIRE_64BIT(ctx); - REQUIRE_EXT(ctx, RVB); - ctx->w = true; - return gen_shift_imm_tl(ctx, a, EXT_ZERO, gen_helper_grev); -} - #define GEN_SHADD_UW(SHAMT) \ static void gen_sh##SHAMT##add_uw(TCGv ret, TCGv arg1, TCGv arg2) \ { \