From nobody Wed Nov 27 12:40:14 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1699028658; cv=none; d=zohomail.com; s=zohoarc; b=U8XLIWpepFYOnBEZ5dDNWAaPruzbbdSAdsXHYMa2c862xXhACpIXdZkz3YOBswBywr6pXTQxDUS44hSYpyDwA9tk9IGDWzSB49ydAvs79Ci6YA9Kye7NVg6Dvpn0J6IElL8ySyeYIgcyDAo0Um0Fo7/TevFs7+RN07JDaP3BL4w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1699028658; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=Dj0lmMHru47k51oEUfPxD/8OwW94ztW1wUywnekyGis=; b=enOAs76G0qLSypkLVhLbGM3ZlYXhntOuaYsavjmU6dp+AgPCwwk38Rh8ys+kRHDuzNXIq2n4KoISmf4pUZxEjFlvEBtuTLYF6+4LaIOvKEflsMLydCKwGypQybgPjCEj05DaybDtWWELz3XzW0sJOecwaFwHR3+azDWdps2zAIk= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1699028658567511.123021794711; Fri, 3 Nov 2023 09:24:18 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qywwc-00034w-OR; Fri, 03 Nov 2023 12:22:50 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qywwa-00034C-PN for qemu-devel@nongnu.org; Fri, 03 Nov 2023 12:22:48 -0400 Received: from mail-ot1-x332.google.com ([2607:f8b0:4864:20::332]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qywwX-0001i9-Vk for qemu-devel@nongnu.org; Fri, 03 Nov 2023 12:22:48 -0400 Received: by mail-ot1-x332.google.com with SMTP id 46e09a7af769-6ce344fa7e4so1306422a34.0 for ; Fri, 03 Nov 2023 09:22:45 -0700 (PDT) Received: from taylor-ubuntu.austin.rr.com (cpe-68-203-8-61.austin.res.rr.com. [68.203.8.61]) by smtp.gmail.com with ESMTPSA id t7-20020a9d7747000000b006ce2c31dd9bsm316039otl.20.2023.11.03.09.22.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Nov 2023 09:22:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1699028564; x=1699633364; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Dj0lmMHru47k51oEUfPxD/8OwW94ztW1wUywnekyGis=; b=kz43nY0vaCLu2qZlQOgzZ9ZhkNQsgVrhTsuIk+2sZtmul9BgBhdIjnx5i0SJTtsXnE 5O52rql1kdg3tiXQqpoawna/R3pnJorHddR6raJ2gYmCb5oJobv26uMgFzfdCxzx4hYK uVnk+s3m84u4uoAmpZG+79RWeXFE/bkyHcU2SZd54GrXrBn5rajpjIXRQ6d0ZPc/D3N3 dtC5zBlTp/281OzztUDew0h2DH1SjQl/0wduO6W4cscyGjD48ACNjvTSFdsqwOFFokVr yX6wuJfAd/0O97Rbbo8ICSg1RhWJciSZy82avFWtJ07i7J4Vcg9bcYsQTyKGPdFymieo IZ+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699028564; x=1699633364; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Dj0lmMHru47k51oEUfPxD/8OwW94ztW1wUywnekyGis=; b=pADfeWUnUho7R7p9LckhCixfuszLlV3cRV608HztuOVd/HmuU0AxzuMPHhLjeLcI7M xAGgHD9YyQ/d+QAaiWwfYTFsKhaPekcJ2QPXCcqZVbkPquGvOUBo+Dk9Pi13kH0SRXW4 SW+AoQ9oGW5EOeiSq+Lu35dkmYpYzhIdDsQ62HWtNlFj7Bb0SQlwpGIFimn67uPY9lwX Fgl6yTomjeoa9f2f9C7BtXE+yviHe9/VZkXJu8IAdFJajMiZH5/ltUdG69TnLeHi2TN3 00mWKbYAAi7Ik4ZhGF+GYIJBEJk89lI3EPRhzmZVDDtp859PAXY3wj4WZA1GCrybOe3y ibHQ== X-Gm-Message-State: AOJu0YwtLrVIWmKiV+kV14TADsaC4oJPX8NNSIr3lF0mCBA5ID/2Y4z0 e52lXrFXPpwhSJfsFA3z8O77MW+JycVIMw== X-Google-Smtp-Source: AGHT+IFSVHfsfpsTWIoyqhW9Cw1onIPQYM6e++HyWUrH4fNnVscqg9fcQkJT+cEvbCDlD1xx/xyX2w== X-Received: by 2002:a9d:748d:0:b0:6c4:c151:8ebe with SMTP id t13-20020a9d748d000000b006c4c1518ebemr22968738otk.22.1699028564157; Fri, 03 Nov 2023 09:22:44 -0700 (PDT) From: Taylor Simpson To: qemu-devel@nongnu.org Cc: bcain@quicinc.com, quic_mathbern@quicinc.com, richard.henderson@linaro.org, philmd@linaro.org, ale@rev.ng, anjo@rev.ng, ltaylorsimpson@gmail.com Subject: [PATCH 1/3] Hexagon (target/hexagon) Analyze reads before writes Date: Fri, 3 Nov 2023 10:22:39 -0600 Message-Id: <20231103162241.92926-2-ltaylorsimpson@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231103162241.92926-1-ltaylorsimpson@gmail.com> References: <20231103162241.92926-1-ltaylorsimpson@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::332; envelope-from=ltaylorsimpson@gmail.com; helo=mail-ot1-x332.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1699028660135100006 We divide gen_analyze_funcs.py into 3 phases Declare the operands Analyze the register reads Analyze the register writes We also create special versions of ctx_log_*_read for new operands Check that the operand is written before the read This is a precursor to improving the analysis for short-circuiting the packet semantics in a subsequent commit Signed-off-by: Taylor Simpson --- target/hexagon/translate.h | 24 ++- target/hexagon/README | 7 +- target/hexagon/gen_analyze_funcs.py | 221 +++++++++++----------------- 3 files changed, 111 insertions(+), 141 deletions(-) diff --git a/target/hexagon/translate.h b/target/hexagon/translate.h index 4dd59c6726..b2fe3a048d 100644 --- a/target/hexagon/translate.h +++ b/target/hexagon/translate.h @@ -75,6 +75,8 @@ typedef struct DisasContext { TCGv dczero_addr; } DisasContext; =20 +bool is_gather_store_insn(DisasContext *ctx); + static inline void ctx_log_pred_write(DisasContext *ctx, int pnum) { if (!test_bit(pnum, ctx->pregs_written)) { @@ -89,6 +91,12 @@ static inline void ctx_log_pred_read(DisasContext *ctx, = int pnum) set_bit(pnum, ctx->pregs_read); } =20 +static inline void ctx_log_pred_read_new(DisasContext *ctx, int pnum) +{ + g_assert(test_bit(pnum, ctx->pregs_written)); + set_bit(pnum, ctx->pregs_read); +} + static inline void ctx_log_reg_write(DisasContext *ctx, int rnum, bool is_predicated) { @@ -120,6 +128,12 @@ static inline void ctx_log_reg_read(DisasContext *ctx,= int rnum) set_bit(rnum, ctx->regs_read); } =20 +static inline void ctx_log_reg_read_new(DisasContext *ctx, int rnum) +{ + g_assert(test_bit(rnum, ctx->regs_written)); + set_bit(rnum, ctx->regs_read); +} + static inline void ctx_log_reg_read_pair(DisasContext *ctx, int rnum) { ctx_log_reg_read(ctx, rnum); @@ -171,6 +185,15 @@ static inline void ctx_log_vreg_read(DisasContext *ctx= , int rnum) set_bit(rnum, ctx->vregs_read); } =20 +static inline void ctx_log_vreg_read_new(DisasContext *ctx, int rnum) +{ + g_assert(is_gather_store_insn(ctx) || + test_bit(rnum, ctx->vregs_updated) || + test_bit(rnum, ctx->vregs_select) || + test_bit(rnum, ctx->vregs_updated_tmp)); + set_bit(rnum, ctx->vregs_read); +} + static inline void ctx_log_vreg_read_pair(DisasContext *ctx, int rnum) { ctx_log_vreg_read(ctx, rnum ^ 0); @@ -205,7 +228,6 @@ extern TCGv hex_vstore_addr[VSTORES_MAX]; extern TCGv hex_vstore_size[VSTORES_MAX]; extern TCGv hex_vstore_pending[VSTORES_MAX]; =20 -bool is_gather_store_insn(DisasContext *ctx); void process_store(DisasContext *ctx, int slot_num); =20 FIELD(PROBE_PKT_SCALAR_STORE_S0, MMU_IDX, 0, 2) diff --git a/target/hexagon/README b/target/hexagon/README index 69b2ffe9bb..7dd74629eb 100644 --- a/target/hexagon/README +++ b/target/hexagon/README @@ -183,10 +183,11 @@ when the override is present. } =20 We also generate an analyze_ function for each instruction. Currentl= y, -these functions record the writes to registers by calling ctx_log_*. Duri= ng +these functions record the reads and writes to registers by calling ctx_lo= g_*. During gen_start_packet, we invoke the analyze_ function for each instructio= n in -the packet, and we mark the implicit writes. After the analysis is perfor= med, -we initialize the result register for each of the predicated assignments. +the packet, and we mark the implicit writes. The analysis determines if t= he packet +semantics can be short-circuited. If not, we initialize the result regist= er for each +of the predicated assignments. =20 In addition to instruction semantics, we use a generator to create the dec= ode tree. This generation is also a two step process. The first step is to r= un diff --git a/target/hexagon/gen_analyze_funcs.py b/target/hexagon/gen_analy= ze_funcs.py index c3b521abef..40b9473c44 100755 --- a/target/hexagon/gen_analyze_funcs.py +++ b/target/hexagon/gen_analyze_funcs.py @@ -22,157 +22,90 @@ import string import hex_common =20 - ## ## Helpers for gen_analyze_func ## def is_predicated(tag): return "A_CONDEXEC" in hex_common.attribdict[tag] =20 +def vreg_write_type(tag): + newv =3D "EXT_DFL" + if hex_common.is_new_result(tag): + newv =3D "EXT_NEW" + elif hex_common.is_tmp_result(tag): + newv =3D "EXT_TMP" + return newv =20 -def analyze_opn_old(f, tag, regtype, regid, regno): +def declare_regn(f, tag, regtype, regid, regno): regN =3D f"{regtype}{regid}N" - predicated =3D "true" if is_predicated(tag) else "false" - if regtype =3D=3D "R": - if regid in {"ss", "tt"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_reg_read_pair(ctx, {regN});\n") - elif regid in {"dd", "ee", "xx", "yy"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_reg_write_pair(ctx, {regN}, {predicated}= );\n") - elif regid in {"s", "t", "u", "v"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_reg_read(ctx, {regN});\n") - elif regid in {"d", "e", "x", "y"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_reg_write(ctx, {regN}, {predicated});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "P": - if regid in {"s", "t", "u", "v"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_pred_read(ctx, {regN});\n") - elif regid in {"d", "e", "x"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_pred_write(ctx, {regN});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "C": - if regid =3D=3D "ss": - f.write( - f" const int {regN} =3D insn->regno[{regno}] " - "+ HEX_REG_SA0;\n" - ) + if regtype =3D=3D "C": + f.write( + f" const int {regN} =3D insn->regno[{regno}] " + "+ HEX_REG_SA0;\n" + ) + else: + f.write(f" const int {regN} =3D insn->regno[{regno}];\n") + +def analyze_read(f, tag, regtype, regid, regno): + regN =3D f"{regtype}{regid}N" + if hex_common.is_pair(regid): + if regtype in {"R", "C"}: f.write(f" ctx_log_reg_read_pair(ctx, {regN});\n") - elif regid =3D=3D "dd": - f.write(f" const int {regN} =3D insn->regno[{regno}] " "+ H= EX_REG_SA0;\n") - f.write(f" ctx_log_reg_write_pair(ctx, {regN}, {predicated}= );\n") - elif regid =3D=3D "s": - f.write( - f" const int {regN} =3D insn->regno[{regno}] " - "+ HEX_REG_SA0;\n" - ) - f.write(f" ctx_log_reg_read(ctx, {regN});\n") - elif regid =3D=3D "d": - f.write(f" const int {regN} =3D insn->regno[{regno}] " "+ H= EX_REG_SA0;\n") - f.write(f" ctx_log_reg_write(ctx, {regN}, {predicated});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "M": - if regid =3D=3D "u": - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_reg_read(ctx, {regN});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "V": - newv =3D "EXT_DFL" - if hex_common.is_new_result(tag): - newv =3D "EXT_NEW" - elif hex_common.is_tmp_result(tag): - newv =3D "EXT_TMP" - if regid in {"dd", "xx"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write( - f" ctx_log_vreg_write_pair(ctx, {regN}, {newv}, " f"{pr= edicated});\n" - ) - elif regid in {"uu", "vv"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") + elif regtype =3D=3D "V": f.write(f" ctx_log_vreg_read_pair(ctx, {regN});\n") - elif regid in {"s", "u", "v", "w"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_vreg_read(ctx, {regN});\n") - elif regid in {"d", "x", "y"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_vreg_write(ctx, {regN}, {newv}, " f"{pre= dicated});\n") else: hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "Q": - if regid in {"d", "e", "x"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_qreg_write(ctx, {regN});\n") - elif regid in {"s", "t", "u", "v"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_qreg_read(ctx, {regN});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "G": - if regid in {"dd"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - elif regid in {"d"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - elif regid in {"ss"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - elif regid in {"s"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "S": - if regid in {"dd"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - elif regid in {"d"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - elif regid in {"ss"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") - elif regid in {"s"}: - f.write(f"// const int {regN} =3D insn->regno[{regno}];\n") + elif hex_common.is_single(regid): + if hex_common.is_old_val(regtype, regid, tag): + if regtype in {"R", "C", "M"}: + f.write(f" ctx_log_reg_read(ctx, {regN});\n") + elif regtype =3D=3D "P": + f.write(f" ctx_log_pred_read(ctx, {regN});\n") + elif regtype in {"V", "O"}: + f.write(f" ctx_log_vreg_read(ctx, {regN});\n") + elif regtype =3D=3D "Q": + f.write(f" ctx_log_qreg_read(ctx, {regN});\n") + else: + hex_common.bad_register(regtype, regid) + elif hex_common.is_new_val(regtype, regid, tag): + if regtype =3D=3D "N": + f.write(f" ctx_log_reg_read_new(ctx, {regN});\n") + elif regtype =3D=3D "P": + f.write(f" ctx_log_pred_read_new(ctx, {regN});\n") + elif regtype =3D=3D "O": + f.write(f" ctx_log_vreg_read_new(ctx, {regN});\n") + else: + hex_common.bad_register(regtype, regid) else: hex_common.bad_register(regtype, regid) else: hex_common.bad_register(regtype, regid) =20 - -def analyze_opn_new(f, tag, regtype, regid, regno): +def analyze_write(f, tag, regtype, regid, regno): regN =3D f"{regtype}{regid}N" - if regtype =3D=3D "N": - if regid in {"s", "t"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_reg_read(ctx, {regN});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "P": - if regid in {"t", "u", "v"}: - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_pred_read(ctx, {regN});\n") - else: - hex_common.bad_register(regtype, regid) - elif regtype =3D=3D "O": - if regid =3D=3D "s": - f.write(f" const int {regN} =3D insn->regno[{regno}];\n") - f.write(f" ctx_log_vreg_read(ctx, {regN});\n") + predicated =3D "true" if is_predicated(tag) else "false" + if hex_common.is_pair(regid): + if regtype in {"R", "C"}: + f.write(f" ctx_log_reg_write_pair(ctx, {regN}, {predicated}= );\n") + elif regtype =3D=3D "V": + f.write( + f" ctx_log_vreg_write_pair(ctx, {regN}, " + f"{vreg_write_type(tag)}, {predicated});\n" + ) else: hex_common.bad_register(regtype, regid) - else: - hex_common.bad_register(regtype, regid) - - -def analyze_opn(f, tag, regtype, regid, i): - if hex_common.is_pair(regid): - analyze_opn_old(f, tag, regtype, regid, i) elif hex_common.is_single(regid): - if hex_common.is_old_val(regtype, regid, tag): - analyze_opn_old(f, tag, regtype, regid, i) - elif hex_common.is_new_val(regtype, regid, tag): - analyze_opn_new(f, tag, regtype, regid, i) + if regtype in {"R", "C"}: + f.write(f" ctx_log_reg_write(ctx, {regN}, {predicated});\n") + elif regtype =3D=3D "P": + f.write(f" ctx_log_pred_write(ctx, {regN});\n") + elif regtype =3D=3D "V": + f.write( + f" ctx_log_vreg_write(ctx, {regN}, " + f"{vreg_write_type(tag)}, {predicated});\n" + ) + elif regtype =3D=3D "Q": + f.write(f" ctx_log_qreg_write(ctx, {regN});\n") else: hex_common.bad_register(regtype, regid) else: @@ -187,11 +120,11 @@ def analyze_opn(f, tag, regtype, regid, i): ## { ## Insn *insn G_GNUC_UNUSED =3D ctx->insn; ## const int RdN =3D insn->regno[0]; -## ctx_log_reg_write(ctx, RdN, false); ## const int RsN =3D insn->regno[1]; -## ctx_log_reg_read(ctx, RsN); ## const int RtN =3D insn->regno[2]; +## ctx_log_reg_read(ctx, RsN); ## ctx_log_reg_read(ctx, RtN); +## ctx_log_reg_write(ctx, RdN, false); ## } ## def gen_analyze_func(f, tag, regs, imms): @@ -200,10 +133,24 @@ def gen_analyze_func(f, tag, regs, imms): =20 f.write(" Insn *insn G_GNUC_UNUSED =3D ctx->insn;\n") =20 + ## Declare the operands + i =3D 0 + for regtype, regid in regs: + declare_regn(f, tag, regtype, regid, i) + i +=3D 1 + + ## Analyze the register reads + i =3D 0 + for regtype, regid in regs: + if hex_common.is_read(regid): + analyze_read(f, tag, regtype, regid, i) + i +=3D 1 + + ## Analyze the register writes i =3D 0 - ## Analyze all the registers for regtype, regid in regs: - analyze_opn(f, tag, regtype, regid, i) + if hex_common.is_written(regid): + analyze_write(f, tag, regtype, regid, i) i +=3D 1 =20 has_generated_helper =3D not hex_common.skip_qemu_helper( @@ -240,13 +187,13 @@ def main(): tagimms =3D hex_common.get_tagimms() =20 with open(sys.argv[-1], "w") as f: - f.write("#ifndef HEXAGON_TCG_FUNCS_H\n") - f.write("#define HEXAGON_TCG_FUNCS_H\n\n") + f.write("#ifndef HEXAGON_ANALYZE_FUNCS_H\n") + f.write("#define HEXAGON_ANALYZE_FUNCS_H\n\n") =20 for tag in hex_common.tags: gen_analyze_func(f, tag, tagregs[tag], tagimms[tag]) =20 - f.write("#endif /* HEXAGON_TCG_FUNCS_H */\n") + f.write("#endif /* HEXAGON_ANALYZE_FUNCS_H */\n") =20 =20 if __name__ =3D=3D "__main__": --=20 2.34.1 From nobody Wed Nov 27 12:40:14 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1699028659; cv=none; d=zohomail.com; s=zohoarc; b=BgR/ltqTCxSnVGuFRKSItiHmUqEnPXCHamJ1/VLZ+toVvQrvNXpDsB1yWPZXNm+PvqU5L8mGRhK6prpVdl+ooX//Zt6RY7oTt102a83AfRc9NX/DVeO+gn1b0Ge7d82tpZxo5N4mrubVYvBqYRT/i7rtK2pCDPzdD7PD5vgmX0g= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1699028659; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=l7NDoqZemMXsjA53+STr4Q/JGMDoeNsO3GVH3o1yeV4=; b=V+ZCCfWsLpKUNZuSBvhHtCwnef+f30IxidBPnjpxpO4qa83RFD3ykhwpRCW/5yKw/V8sd5xamN2b7jNzLnQbrrAYMwo9c45xVkchmvLh3t253SwYfx4E4b+j595xAatcqZwB2Qk6+tLaVrhITyVlQ2zrDajAvXYF6R6anYlpLEM= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1699028659282727.2772409870491; Fri, 3 Nov 2023 09:24:19 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qywwc-00034r-KE; Fri, 03 Nov 2023 12:22:50 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qywwb-00034Y-K8 for qemu-devel@nongnu.org; Fri, 03 Nov 2023 12:22:49 -0400 Received: from mail-ot1-x330.google.com ([2607:f8b0:4864:20::330]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qywwZ-0001iP-JO for qemu-devel@nongnu.org; Fri, 03 Nov 2023 12:22:49 -0400 Received: by mail-ot1-x330.google.com with SMTP id 46e09a7af769-6ce2cc39d12so1252891a34.1 for ; Fri, 03 Nov 2023 09:22:47 -0700 (PDT) Received: from taylor-ubuntu.austin.rr.com (cpe-68-203-8-61.austin.res.rr.com. [68.203.8.61]) by smtp.gmail.com with ESMTPSA id t7-20020a9d7747000000b006ce2c31dd9bsm316039otl.20.2023.11.03.09.22.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Nov 2023 09:22:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1699028565; x=1699633365; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=l7NDoqZemMXsjA53+STr4Q/JGMDoeNsO3GVH3o1yeV4=; b=F3YH2sUjsYeue80qEErZDPPTf9m7baRpuhrdz7rfXnFX9zSYBypAi+h1lupqsXq/SP zXZFJ3TJ9s2uBtagfyww5x5BqnjU7LOhSmO8z1fZ5CW273yiGv8ArYk4ln2WFKteoJvA EyFn5jHwom3dcPJnv6xwmyupXcrm6+ohY9dpX7nhWtrgBd0LdBIkC+sJado3ouWXQ+Lc zxYJc3K7gXXLD2KLxkph/FNFPt3WO1TrhinxGByxaSKuNY8wrzieqh+oBe10T38EKp3r 2XgIsFtPrpyR0OwWgGFdaegUveh25eTH1FxVHsxwEDt6gCwbXmhr8VGRi67zMq/+x2Nv YBdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699028565; x=1699633365; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=l7NDoqZemMXsjA53+STr4Q/JGMDoeNsO3GVH3o1yeV4=; b=G+drMDNUBXN0M7LffjQ7VzSouzXDsl0Md4SLnbds6J1r3r6BkhFnGuKf6LW3gSqCN1 nxzeK0M+zAVnqB+ZSlZ3i5XIjcwrsqGI6mIikaIkcyZXp0yFNfAdVhsPMUhhfbJCUBYU S1i8eYuAQgeX2/te92EQ33p3tP2AKTg8MC5iLqeSkk3CuvnTZhLkVWfNhJBOjyKpbZUX 0433Cd/IFOgArhHpNDgKyLejG40xPCegkVko2mf8e7UqhjuoRlUzPdeoi/OksSAIvTMo oQ8QRcsDpYRbfhrSBGNYM1+FNT/Me7S+LDtzHMc02tTnQALhtrid5Oc9tnKJoC4KE/Vb nffw== X-Gm-Message-State: AOJu0Yyqy8x5iCw5BS/DQPai+vHtCQ7UOdpCzykG0oPGxDfbBIGctIDd KiMVHAQ8sYpZnJhCDCi39zFcjEnK27zCOw== X-Google-Smtp-Source: AGHT+IGEReq3r3zKgkADJ9cPsjRzhBKtdSgiDnNVxeH4cEftI70/FRfGLBtfZxdhZt/nn/dDVpWRhQ== X-Received: by 2002:a9d:768f:0:b0:6c2:2bca:7a14 with SMTP id j15-20020a9d768f000000b006c22bca7a14mr21696282otl.23.1699028565532; Fri, 03 Nov 2023 09:22:45 -0700 (PDT) From: Taylor Simpson To: qemu-devel@nongnu.org Cc: bcain@quicinc.com, quic_mathbern@quicinc.com, richard.henderson@linaro.org, philmd@linaro.org, ale@rev.ng, anjo@rev.ng, ltaylorsimpson@gmail.com Subject: [PATCH 2/3] Hexagon (target/hexagon) Enable more short-circuit packets (scalar core) Date: Fri, 3 Nov 2023 10:22:40 -0600 Message-Id: <20231103162241.92926-3-ltaylorsimpson@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231103162241.92926-1-ltaylorsimpson@gmail.com> References: <20231103162241.92926-1-ltaylorsimpson@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::330; envelope-from=ltaylorsimpson@gmail.com; helo=mail-ot1-x330.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1699028660164100009 Look for read-after-write instead of overlap of reads and writes Here is an example with overalp but no read-after-write: 0x000200fc: 0x38103876 { R0 =3D add(R0,R1); R6 =3D add(R6,R7) } BEFORE: ---- 00000000000200fc mov_i32 loc2,$0x0 mov_i32 loc2,r0 add_i32 loc3,loc2,r1 mov_i32 loc2,loc3 mov_i32 loc4,$0x0 mov_i32 loc4,r6 add_i32 loc5,loc4,r7 mov_i32 loc4,loc5 mov_i32 r0,loc2 mov_i32 r6,loc4 AFTER: ---- 00000000000200fc add_i32 loc2,r0,r1 mov_i32 r0,loc2 add_i32 loc3,r6,r7 mov_i32 r6,loc3 We can also short-circuit packets with .new values by reading from the real destination instead of the temporary. 0x00020100: 0x78005ff3 { R19 =3D #0xff 0x00020104: 0x2002e204 if (cmp.eq(N19.new,R2)) jump:t PC+8 } BEFORE: ---- 0000000000020100 mov_i32 pc,$0x20108 mov_i32 loc8,$0x0 mov_i32 loc8,$0xff setcond_i32 loc10,loc8,r2,eq mov_i32 loc6,loc10 mov_i32 r19,loc8 add_i32 pkt_cnt,pkt_cnt,$0x2 add_i32 insn_cnt,insn_cnt,$0x4 brcond_i32 loc6,$0x0,eq,$L1 goto_tb $0x0 mov_i32 pc,$0x20108 exit_tb $0x7fbb54000040 set_label $L1 goto_tb $0x1 exit_tb $0x7fbb54000041 set_label $L0 exit_tb $0x7fbb54000043 AFTER: ---- 0000000000020100 mov_i32 pc,$0x20108 mov_i32 r19,$0xff setcond_i32 loc7,r19,r2,eq mov_i32 loc4,loc7 add_i32 pkt_cnt,pkt_cnt,$0x2 add_i32 insn_cnt,insn_cnt,$0x4 brcond_i32 loc4,$0x0,eq,$L1 goto_tb $0x0 mov_i32 pc,$0x20108 exit_tb $0x7f9764000040 set_label $L1 goto_tb $0x1 exit_tb $0x7f9764000041 set_label $L0 exit_tb $0x7f9764000043 Signed-off-by: Taylor Simpson --- target/hexagon/translate.h | 13 +++++++------ target/hexagon/translate.c | 19 +++---------------- target/hexagon/gen_tcg_funcs.py | 2 +- 3 files changed, 11 insertions(+), 23 deletions(-) diff --git a/target/hexagon/translate.h b/target/hexagon/translate.h index b2fe3a048d..7bb19ee672 100644 --- a/target/hexagon/translate.h +++ b/target/hexagon/translate.h @@ -38,12 +38,10 @@ typedef struct DisasContext { int reg_log[REG_WRITES_MAX]; int reg_log_idx; DECLARE_BITMAP(regs_written, TOTAL_PER_THREAD_REGS); - DECLARE_BITMAP(regs_read, TOTAL_PER_THREAD_REGS); DECLARE_BITMAP(predicated_regs, TOTAL_PER_THREAD_REGS); int preg_log[PRED_WRITES_MAX]; int preg_log_idx; DECLARE_BITMAP(pregs_written, NUM_PREGS); - DECLARE_BITMAP(pregs_read, NUM_PREGS); uint8_t store_width[STORES_MAX]; bool s1_store_processed; int future_vregs_idx; @@ -68,6 +66,7 @@ typedef struct DisasContext { bool is_tight_loop; bool short_circuit; bool has_hvx_helper; + bool read_after_write; TCGv new_value[TOTAL_PER_THREAD_REGS]; TCGv new_pred_value[NUM_PREGS]; TCGv pred_written; @@ -88,13 +87,14 @@ static inline void ctx_log_pred_write(DisasContext *ctx= , int pnum) =20 static inline void ctx_log_pred_read(DisasContext *ctx, int pnum) { - set_bit(pnum, ctx->pregs_read); + if (test_bit(pnum, ctx->pregs_written)) { + ctx->read_after_write =3D true; + } } =20 static inline void ctx_log_pred_read_new(DisasContext *ctx, int pnum) { g_assert(test_bit(pnum, ctx->pregs_written)); - set_bit(pnum, ctx->pregs_read); } =20 static inline void ctx_log_reg_write(DisasContext *ctx, int rnum, @@ -125,13 +125,14 @@ static inline void ctx_log_reg_write_pair(DisasContex= t *ctx, int rnum, =20 static inline void ctx_log_reg_read(DisasContext *ctx, int rnum) { - set_bit(rnum, ctx->regs_read); + if (test_bit(rnum, ctx->regs_written)) { + ctx->read_after_write =3D true; + } } =20 static inline void ctx_log_reg_read_new(DisasContext *ctx, int rnum) { g_assert(test_bit(rnum, ctx->regs_written)); - set_bit(rnum, ctx->regs_read); } =20 static inline void ctx_log_reg_read_pair(DisasContext *ctx, int rnum) diff --git a/target/hexagon/translate.c b/target/hexagon/translate.c index 666c061180..9dab26ee17 100644 --- a/target/hexagon/translate.c +++ b/target/hexagon/translate.c @@ -394,20 +394,8 @@ static bool need_commit(DisasContext *ctx) } } =20 - /* Check for overlap between register reads and writes */ - for (int i =3D 0; i < ctx->reg_log_idx; i++) { - int rnum =3D ctx->reg_log[i]; - if (test_bit(rnum, ctx->regs_read)) { - return true; - } - } - - /* Check for overlap between predicate reads and writes */ - for (int i =3D 0; i < ctx->preg_log_idx; i++) { - int pnum =3D ctx->preg_log[i]; - if (test_bit(pnum, ctx->pregs_read)) { - return true; - } + if (ctx->read_after_write) { + return true; } =20 /* Check for overlap between HVX reads and writes */ @@ -466,6 +454,7 @@ static void analyze_packet(DisasContext *ctx) { Packet *pkt =3D ctx->pkt; ctx->has_hvx_helper =3D false; + ctx->read_after_write =3D false; for (int i =3D 0; i < pkt->num_insns; i++) { Insn *insn =3D &pkt->insn[i]; ctx->insn =3D insn; @@ -490,11 +479,9 @@ static void gen_start_packet(DisasContext *ctx) ctx->next_PC =3D next_PC; ctx->reg_log_idx =3D 0; bitmap_zero(ctx->regs_written, TOTAL_PER_THREAD_REGS); - bitmap_zero(ctx->regs_read, TOTAL_PER_THREAD_REGS); bitmap_zero(ctx->predicated_regs, TOTAL_PER_THREAD_REGS); ctx->preg_log_idx =3D 0; bitmap_zero(ctx->pregs_written, NUM_PREGS); - bitmap_zero(ctx->pregs_read, NUM_PREGS); ctx->future_vregs_idx =3D 0; ctx->tmp_vregs_idx =3D 0; ctx->vreg_log_idx =3D 0; diff --git a/target/hexagon/gen_tcg_funcs.py b/target/hexagon/gen_tcg_funcs= .py index f5246cee6d..3d24ae7960 100755 --- a/target/hexagon/gen_tcg_funcs.py +++ b/target/hexagon/gen_tcg_funcs.py @@ -198,7 +198,7 @@ def genptr_decl_new(f, tag, regtype, regid, regno): if regid in {"t", "u", "v"}: f.write( f" TCGv {regtype}{regid}N =3D " - f"ctx->new_pred_value[insn->regno[{regno}]];\n" + f"get_result_pred(ctx, insn->regno[{regno}]);\n" ) else: hex_common.bad_register(regtype, regid) --=20 2.34.1 From nobody Wed Nov 27 12:40:14 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1699028658; cv=none; d=zohomail.com; s=zohoarc; b=nq/N3g70nvmV6gyXTdmhNzAxojS+FeEL5xmXhAUC/n9UGvOc7SoCddAy37FEBflxQoid1CAiCMccOUscILIeVnifAxrdmc2hWWcluxRdeTs20hbRxxFXFP1MOZVyg6DOJf525hVvxcAPDGE49Qyu7XGzmQYCD+oNOyTdO6jX6Ks= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1699028658; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=I5FNvjn0ATHflRyMpKMII8LXHmYInbpSNP8db9bDXig=; b=TJ/wqLBdXA+6s9+/614h8MtFYjqvCmBSjWRB8h/bSxFhFsoxgwT80R5fq2bK6HoKQpNtQSYkZxwIZfvDEXdENjUw63DTp7+LIx9lZT9N5WBprB4/CWtuK7cGPBMsJn5Y4a7v+BxK/rLi3LJihc8/9BCWv0igdUnisykGxMuvaWk= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1699028658699735.6738356413267; Fri, 3 Nov 2023 09:24:18 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qywwk-00035o-AZ; Fri, 03 Nov 2023 12:22:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qywwi-00035Z-My for qemu-devel@nongnu.org; Fri, 03 Nov 2023 12:22:56 -0400 Received: from mail-ot1-x333.google.com ([2607:f8b0:4864:20::333]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qywwa-0001ig-P5 for qemu-devel@nongnu.org; Fri, 03 Nov 2023 12:22:56 -0400 Received: by mail-ot1-x333.google.com with SMTP id 46e09a7af769-6ce2cc39d12so1252907a34.1 for ; Fri, 03 Nov 2023 09:22:48 -0700 (PDT) Received: from taylor-ubuntu.austin.rr.com (cpe-68-203-8-61.austin.res.rr.com. [68.203.8.61]) by smtp.gmail.com with ESMTPSA id t7-20020a9d7747000000b006ce2c31dd9bsm316039otl.20.2023.11.03.09.22.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Nov 2023 09:22:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1699028567; x=1699633367; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=I5FNvjn0ATHflRyMpKMII8LXHmYInbpSNP8db9bDXig=; b=EbyHV3yMCaLCo+MdPJhX+yLSDlhsPGTRbb1DLiFRE3n3ZI03LeKisvb9q5n+tb7m7k yCAvkpuuVm77FSTlpGNC7VF9BadCCi0Up/Pglsk9xA1hl10MmsUWqa6tVLaJrfn08FB+ Nbf7gTIxYU86ph4XDW7t3l8CSXhayR00JQ7w479h+sq2aOXnJq/URj76Qp/WN0sfnH3m d2/3Fswq1vEENDmrwjMHpaTVKXBiw5qVrgUKLIaEDtXu3ywR9MZLWncno4hzBk5liyFa 1HyUTzrGS81eCJuj8VFqsjCxH3M5PyWUqL8a/1JLrEn31SATYgDKQ9dpOPVNoQoQlKN5 rz5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699028567; x=1699633367; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=I5FNvjn0ATHflRyMpKMII8LXHmYInbpSNP8db9bDXig=; b=CYt8WS+vyhOf8DWgqpG9/5cDiHR6mgIzwX3DjbJ6bo0ohoZAk9xCJhfUDT9ULOrzsF cBM6U827rFNdMUcjGvRaIbuWgquFNGuZ12gIahu2vck7VBylk1BynNRM8qhrBL0tFohx 3JF8NZs8SbLszzgk9CDtfrfJ69FVgpEpOaMwxD5X3cfUgK83nWZtpAaWwo6bB5ajy7UY a7CygUcHfKaez2ArUJr/4LCUjQI0v3wuQpAqdSxZoNpLEUX6F53cHrddwhTeAAEwT7T2 uWocICJd4A08qYcXLtrs1blY+OCTi+FvrrDgwB+T+vHRqDMaLT0bvaJqLFq74oDeBrAG SQNQ== X-Gm-Message-State: AOJu0YzYMDw7dUDsjL+G3yP7lwQahLvi2kIQS3+l/kFG3nw691Zg1nTJ KWdwKH5+Yd3u74y3KghRSNZPwonG39g6Aw== X-Google-Smtp-Source: AGHT+IHep/2rp/KJrq9DGG6IYcXqK07Lr0dtpmjST/sgGqjI+dt6j7RK5zjXFvAkzxUDc8ERM/2lzw== X-Received: by 2002:a05:6830:3144:b0:6c4:d08c:6a2 with SMTP id c4-20020a056830314400b006c4d08c06a2mr27152625ots.9.1699028567196; Fri, 03 Nov 2023 09:22:47 -0700 (PDT) From: Taylor Simpson To: qemu-devel@nongnu.org Cc: bcain@quicinc.com, quic_mathbern@quicinc.com, richard.henderson@linaro.org, philmd@linaro.org, ale@rev.ng, anjo@rev.ng, ltaylorsimpson@gmail.com Subject: [PATCH 3/3] Hexagon (target/hexagon) Enable more short-circuit packets (HVX) Date: Fri, 3 Nov 2023 10:22:41 -0600 Message-Id: <20231103162241.92926-4-ltaylorsimpson@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231103162241.92926-1-ltaylorsimpson@gmail.com> References: <20231103162241.92926-1-ltaylorsimpson@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::333; envelope-from=ltaylorsimpson@gmail.com; helo=mail-ot1-x333.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, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1699028660142100008 Look for read-after-write instead of overlap of reads and writes HVX instructions with helpers have pass-by-reference semantics, so we check for overlaps of reads and writes within the same instruction. Signed-off-by: Taylor Simpson --- target/hexagon/translate.h | 88 +++++++++++++++++++++++------ target/hexagon/translate.c | 58 ++----------------- target/hexagon/gen_analyze_funcs.py | 51 +++++++++++------ target/hexagon/hex_common.py | 10 ++++ 4 files changed, 120 insertions(+), 87 deletions(-) diff --git a/target/hexagon/translate.h b/target/hexagon/translate.h index 7bb19ee672..7f47db71e8 100644 --- a/target/hexagon/translate.h +++ b/target/hexagon/translate.h @@ -50,23 +50,27 @@ typedef struct DisasContext { int tmp_vregs_num[VECTOR_TEMPS_MAX]; int vreg_log[NUM_VREGS]; int vreg_log_idx; + DECLARE_BITMAP(vregs_written, NUM_VREGS); + DECLARE_BITMAP(insn_vregs_written, NUM_VREGS); DECLARE_BITMAP(vregs_updated_tmp, NUM_VREGS); DECLARE_BITMAP(vregs_updated, NUM_VREGS); DECLARE_BITMAP(vregs_select, NUM_VREGS); DECLARE_BITMAP(predicated_future_vregs, NUM_VREGS); DECLARE_BITMAP(predicated_tmp_vregs, NUM_VREGS); - DECLARE_BITMAP(vregs_read, NUM_VREGS); + DECLARE_BITMAP(insn_vregs_read, NUM_VREGS); int qreg_log[NUM_QREGS]; int qreg_log_idx; - DECLARE_BITMAP(qregs_read, NUM_QREGS); + DECLARE_BITMAP(qregs_written, NUM_QREGS); + DECLARE_BITMAP(insn_qregs_written, NUM_QREGS); + DECLARE_BITMAP(insn_qregs_read, NUM_QREGS); bool pre_commit; bool need_commit; TCGCond branch_cond; target_ulong branch_dest; bool is_tight_loop; bool short_circuit; - bool has_hvx_helper; bool read_after_write; + bool has_hvx_overlap; TCGv new_value[TOTAL_PER_THREAD_REGS]; TCGv new_pred_value[NUM_PREGS]; TCGv pred_written; @@ -146,10 +150,25 @@ intptr_t ctx_future_vreg_off(DisasContext *ctx, int r= egnum, intptr_t ctx_tmp_vreg_off(DisasContext *ctx, int regnum, int num, bool alloc_ok); =20 +static inline void ctx_start_hvx_insn(DisasContext *ctx) +{ + bitmap_zero(ctx->insn_vregs_written, NUM_VREGS); + bitmap_zero(ctx->insn_vregs_read, NUM_VREGS); + bitmap_zero(ctx->insn_qregs_written, NUM_QREGS); + bitmap_zero(ctx->insn_qregs_read, NUM_QREGS); +} + static inline void ctx_log_vreg_write(DisasContext *ctx, int rnum, VRegWriteType type, - bool is_predicated) + bool is_predicated, bool has_helper) { + if (has_helper) { + set_bit(rnum, ctx->insn_vregs_written); + if (test_bit(rnum, ctx->insn_vregs_read)) { + ctx->has_hvx_overlap =3D true; + } + } + set_bit(rnum, ctx->vregs_written); if (type !=3D EXT_TMP) { if (!test_bit(rnum, ctx->vregs_updated)) { ctx->vreg_log[ctx->vreg_log_idx] =3D rnum; @@ -175,42 +194,77 @@ static inline void ctx_log_vreg_write(DisasContext *c= tx, =20 static inline void ctx_log_vreg_write_pair(DisasContext *ctx, int rnum, VRegWriteType type, - bool is_predicated) + bool is_predicated, bool has_he= lper) { - ctx_log_vreg_write(ctx, rnum ^ 0, type, is_predicated); - ctx_log_vreg_write(ctx, rnum ^ 1, type, is_predicated); + ctx_log_vreg_write(ctx, rnum ^ 0, type, is_predicated, has_helper); + ctx_log_vreg_write(ctx, rnum ^ 1, type, is_predicated, has_helper); } =20 -static inline void ctx_log_vreg_read(DisasContext *ctx, int rnum) +static inline void ctx_log_vreg_read(DisasContext *ctx, int rnum, + bool has_helper) { - set_bit(rnum, ctx->vregs_read); + if (has_helper) { + set_bit(rnum, ctx->insn_vregs_read); + if (test_bit(rnum, ctx->insn_vregs_written)) { + ctx->has_hvx_overlap =3D true; + } + } + if (test_bit(rnum, ctx->vregs_written)) { + ctx->read_after_write =3D true; + } } =20 -static inline void ctx_log_vreg_read_new(DisasContext *ctx, int rnum) +static inline void ctx_log_vreg_read_new(DisasContext *ctx, int rnum, + bool has_helper) { g_assert(is_gather_store_insn(ctx) || test_bit(rnum, ctx->vregs_updated) || test_bit(rnum, ctx->vregs_select) || test_bit(rnum, ctx->vregs_updated_tmp)); - set_bit(rnum, ctx->vregs_read); + if (has_helper) { + set_bit(rnum, ctx->insn_vregs_read); + if (test_bit(rnum, ctx->insn_vregs_written)) { + ctx->has_hvx_overlap =3D true; + } + } + if (is_gather_store_insn(ctx)) { + ctx->read_after_write =3D true; + } } =20 -static inline void ctx_log_vreg_read_pair(DisasContext *ctx, int rnum) +static inline void ctx_log_vreg_read_pair(DisasContext *ctx, int rnum, + bool has_helper) { - ctx_log_vreg_read(ctx, rnum ^ 0); - ctx_log_vreg_read(ctx, rnum ^ 1); + ctx_log_vreg_read(ctx, rnum ^ 0, has_helper); + ctx_log_vreg_read(ctx, rnum ^ 1, has_helper); } =20 static inline void ctx_log_qreg_write(DisasContext *ctx, - int rnum) + int rnum, bool has_helper) { + if (has_helper) { + set_bit(rnum, ctx->insn_qregs_written); + if (test_bit(rnum, ctx->insn_qregs_read)) { + ctx->has_hvx_overlap =3D true; + } + } + set_bit(rnum, ctx->qregs_written); ctx->qreg_log[ctx->qreg_log_idx] =3D rnum; ctx->qreg_log_idx++; } =20 -static inline void ctx_log_qreg_read(DisasContext *ctx, int qnum) +static inline void ctx_log_qreg_read(DisasContext *ctx, + int qnum, bool has_helper) { - set_bit(qnum, ctx->qregs_read); + if (has_helper) { + set_bit(qnum, ctx->insn_qregs_read); + if (test_bit(qnum, ctx->insn_qregs_written)) { + ctx->has_hvx_overlap =3D true; + } + } + if (test_bit(qnum, ctx->qregs_written)) { + ctx->read_after_write =3D true; + } } =20 extern TCGv hex_gpr[TOTAL_PER_THREAD_REGS]; diff --git a/target/hexagon/translate.c b/target/hexagon/translate.c index 9dab26ee17..3545480080 100644 --- a/target/hexagon/translate.c +++ b/target/hexagon/translate.c @@ -378,60 +378,10 @@ static bool need_commit(DisasContext *ctx) return true; } =20 - if (pkt->num_insns =3D=3D 1) { - if (pkt->pkt_has_hvx) { - /* - * The HVX instructions with generated helpers use - * pass-by-reference, so they need the read/write overlap - * check below. - * The HVX instructions with overrides are OK. - */ - if (!ctx->has_hvx_helper) { - return false; - } - } else { - return false; - } - } - - if (ctx->read_after_write) { + if (ctx->read_after_write || ctx->has_hvx_overlap) { return true; } =20 - /* Check for overlap between HVX reads and writes */ - for (int i =3D 0; i < ctx->vreg_log_idx; i++) { - int vnum =3D ctx->vreg_log[i]; - if (test_bit(vnum, ctx->vregs_read)) { - return true; - } - } - if (!bitmap_empty(ctx->vregs_updated_tmp, NUM_VREGS)) { - int i =3D find_first_bit(ctx->vregs_updated_tmp, NUM_VREGS); - while (i < NUM_VREGS) { - if (test_bit(i, ctx->vregs_read)) { - return true; - } - i =3D find_next_bit(ctx->vregs_updated_tmp, NUM_VREGS, i + 1); - } - } - if (!bitmap_empty(ctx->vregs_select, NUM_VREGS)) { - int i =3D find_first_bit(ctx->vregs_select, NUM_VREGS); - while (i < NUM_VREGS) { - if (test_bit(i, ctx->vregs_read)) { - return true; - } - i =3D find_next_bit(ctx->vregs_select, NUM_VREGS, i + 1); - } - } - - /* Check for overlap between HVX predicate reads and writes */ - for (int i =3D 0; i < ctx->qreg_log_idx; i++) { - int qnum =3D ctx->qreg_log[i]; - if (test_bit(qnum, ctx->qregs_read)) { - return true; - } - } - return false; } =20 @@ -453,8 +403,8 @@ static void mark_implicit_pred_reads(DisasContext *ctx) static void analyze_packet(DisasContext *ctx) { Packet *pkt =3D ctx->pkt; - ctx->has_hvx_helper =3D false; ctx->read_after_write =3D false; + ctx->has_hvx_overlap =3D false; for (int i =3D 0; i < pkt->num_insns; i++) { Insn *insn =3D &pkt->insn[i]; ctx->insn =3D insn; @@ -485,13 +435,13 @@ static void gen_start_packet(DisasContext *ctx) ctx->future_vregs_idx =3D 0; ctx->tmp_vregs_idx =3D 0; ctx->vreg_log_idx =3D 0; + bitmap_zero(ctx->vregs_written, NUM_VREGS); bitmap_zero(ctx->vregs_updated_tmp, NUM_VREGS); bitmap_zero(ctx->vregs_updated, NUM_VREGS); bitmap_zero(ctx->vregs_select, NUM_VREGS); bitmap_zero(ctx->predicated_future_vregs, NUM_VREGS); bitmap_zero(ctx->predicated_tmp_vregs, NUM_VREGS); - bitmap_zero(ctx->vregs_read, NUM_VREGS); - bitmap_zero(ctx->qregs_read, NUM_QREGS); + bitmap_zero(ctx->qregs_written, NUM_QREGS); ctx->qreg_log_idx =3D 0; for (i =3D 0; i < STORES_MAX; i++) { ctx->store_width[i] =3D 0; diff --git a/target/hexagon/gen_analyze_funcs.py b/target/hexagon/gen_analy= ze_funcs.py index 40b9473c44..4541174590 100755 --- a/target/hexagon/gen_analyze_funcs.py +++ b/target/hexagon/gen_analyze_funcs.py @@ -52,7 +52,10 @@ def analyze_read(f, tag, regtype, regid, regno): if regtype in {"R", "C"}: f.write(f" ctx_log_reg_read_pair(ctx, {regN});\n") elif regtype =3D=3D "V": - f.write(f" ctx_log_vreg_read_pair(ctx, {regN});\n") + f.write( + f" ctx_log_vreg_read_pair(ctx, {regN}, " + "insn_has_hvx_helper);\n" + ) else: hex_common.bad_register(regtype, regid) elif hex_common.is_single(regid): @@ -62,9 +65,15 @@ def analyze_read(f, tag, regtype, regid, regno): elif regtype =3D=3D "P": f.write(f" ctx_log_pred_read(ctx, {regN});\n") elif regtype in {"V", "O"}: - f.write(f" ctx_log_vreg_read(ctx, {regN});\n") + f.write( + f" ctx_log_vreg_read(ctx, {regN}, " + "insn_has_hvx_helper);\n" + ) elif regtype =3D=3D "Q": - f.write(f" ctx_log_qreg_read(ctx, {regN});\n") + f.write( + f" ctx_log_qreg_read(ctx, {regN}, " + "insn_has_hvx_helper);\n" + ) else: hex_common.bad_register(regtype, regid) elif hex_common.is_new_val(regtype, regid, tag): @@ -73,7 +82,10 @@ def analyze_read(f, tag, regtype, regid, regno): elif regtype =3D=3D "P": f.write(f" ctx_log_pred_read_new(ctx, {regN});\n") elif regtype =3D=3D "O": - f.write(f" ctx_log_vreg_read_new(ctx, {regN});\n") + f.write( + f" ctx_log_vreg_read_new(ctx, {regN}, " + "insn_has_hvx_helper);\n" + ) else: hex_common.bad_register(regtype, regid) else: @@ -90,7 +102,8 @@ def analyze_write(f, tag, regtype, regid, regno): elif regtype =3D=3D "V": f.write( f" ctx_log_vreg_write_pair(ctx, {regN}, " - f"{vreg_write_type(tag)}, {predicated});\n" + f"{vreg_write_type(tag)}, {predicated}, " + "insn_has_hvx_helper);\n" ) else: hex_common.bad_register(regtype, regid) @@ -102,10 +115,14 @@ def analyze_write(f, tag, regtype, regid, regno): elif regtype =3D=3D "V": f.write( f" ctx_log_vreg_write(ctx, {regN}, " - f"{vreg_write_type(tag)}, {predicated});\n" + f"{vreg_write_type(tag)}, {predicated}, " + "insn_has_hvx_helper);\n" ) elif regtype =3D=3D "Q": - f.write(f" ctx_log_qreg_write(ctx, {regN});\n") + f.write( + f" ctx_log_qreg_write(ctx, {regN}, " + "insn_has_hvx_helper);\n" + ) else: hex_common.bad_register(regtype, regid) else: @@ -132,6 +149,17 @@ def gen_analyze_func(f, tag, regs, imms): f.write("{\n") =20 f.write(" Insn *insn G_GNUC_UNUSED =3D ctx->insn;\n") + if (hex_common.is_hvx_insn(tag)): + if hex_common.has_hvx_helper(tag): + f.write( + " const bool G_GNUC_UNUSED insn_has_hvx_helper =3D true= ;\n" + ) + f.write(" ctx_start_hvx_insn(ctx);\n") + else: + f.write( + " const bool G_GNUC_UNUSED insn_has_hvx_helper =3D fals= e;\n" + ) + =20 ## Declare the operands i =3D 0 @@ -153,15 +181,6 @@ def gen_analyze_func(f, tag, regs, imms): analyze_write(f, tag, regtype, regid, i) i +=3D 1 =20 - has_generated_helper =3D not hex_common.skip_qemu_helper( - tag - ) and not hex_common.is_idef_parser_enabled(tag) - - ## Mark HVX instructions with generated helpers - if (has_generated_helper and - "A_CVI" in hex_common.attribdict[tag]): - f.write(" ctx->has_hvx_helper =3D true;\n") - f.write("}\n\n") =20 =20 diff --git a/target/hexagon/hex_common.py b/target/hexagon/hex_common.py index 0da65d6dd6..befe3590c2 100755 --- a/target/hexagon/hex_common.py +++ b/target/hexagon/hex_common.py @@ -307,6 +307,16 @@ def is_idef_parser_enabled(tag): return tag in idef_parser_enabled =20 =20 +def is_hvx_insn(tag): + return "A_CVI" in attribdict[tag] + + +def has_hvx_helper(tag): + return (is_hvx_insn(tag) and + not skip_qemu_helper(tag) and + not is_idef_parser_enabled(tag)) + + def imm_name(immlett): return f"{immlett}iV" =20 --=20 2.34.1