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Tue, 08 Nov 2022 04:05:57 +0000 Received: from pps.filterd (NALASPPMTA04.qualcomm.com [127.0.0.1]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 2A845tE0022946; Tue, 8 Nov 2022 04:05:56 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA04.qualcomm.com (PPS) with ESMTPS id 3kngwksv3h-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 08 Nov 2022 04:05:56 +0000 Received: from NALASPPMTA04.qualcomm.com (NALASPPMTA04.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 2A845tDM022917; Tue, 8 Nov 2022 04:05:55 GMT Received: from hu-devc-lv-u18-c.qualcomm.com (hu-tsimpson-lv.qualcomm.com [10.47.235.220]) by NALASPPMTA04.qualcomm.com (PPS) with ESMTP id 2A845soB022911; Tue, 08 Nov 2022 04:05:55 +0000 Received: by hu-devc-lv-u18-c.qualcomm.com (Postfix, from userid 47164) id 2B2BB500117; Mon, 7 Nov 2022 20:05:54 -0800 (PST) From: Taylor Simpson To: qemu-devel@nongnu.org Cc: tsimpson@quicinc.com, richard.henderson@linaro.org, philmd@linaro.org, ale@rev.ng, anjo@rev.ng, bcain@quicinc.com, quic_mathbern@quicinc.com Subject: [PATCH v4 10/11] Hexagon (target/hexagon) Use direct block chaining for direct jump/branch Date: Mon, 7 Nov 2022 20:05:51 -0800 Message-Id: <20221108040552.22175-11-tsimpson@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221108040552.22175-1-tsimpson@quicinc.com> References: <20221108040552.22175-1-tsimpson@quicinc.com> MIME-Version: 1.0 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: C-XK3Uz7IotoFb3pveCtsOZUacuU6L0a X-Proofpoint-GUID: C-XK3Uz7IotoFb3pveCtsOZUacuU6L0a X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-07_11,2022-11-07_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 phishscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=993 impostorscore=0 clxscore=1015 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211080020 Received-SPF: pass client-ip=205.220.168.131; envelope-from=tsimpson@qualcomm.com; helo=mx0a-0031df01.pphosted.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_LOW=-0.7, 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 Direct block chaining is documented here https://qemu.readthedocs.io/en/latest/devel/tcg.html#direct-block-chaining Recall that Hexagon allows packets with multiple jumps where only the first one with a true predicate will actually jump. We can use tcg_gen_goto_tb/tcg_gen_exit_tb when the packet contains a single PC-relative branch or jump. If not, we use tcg_gen_lookup_and_goto_ptr. We add the following to DisasContext in order to delay the branching until the end of packet commit (in gen_end_tb) branch_cond The TCGCond condition under which the branch is taken When branch_cond == TCG_COND_NEVER, there isn't a single direct branch in this packet. When branch_cond != TCG_COND_ALWAYS, the value is in hex_branch_taken branch_dest The destination of the branch Reviewed-by: Richard Henderson Signed-off-by: Taylor Simpson --- target/hexagon/translate.h | 2 ++ target/hexagon/genptr.c | 12 +++++++++++- target/hexagon/translate.c | 35 ++++++++++++++++++++++++++++++++++- 3 files changed, 47 insertions(+), 2 deletions(-) diff --git a/target/hexagon/translate.h b/target/hexagon/translate.h index 96509a4da7..aacf0b0921 100644 --- a/target/hexagon/translate.h +++ b/target/hexagon/translate.h @@ -57,6 +57,8 @@ typedef struct DisasContext { bool qreg_is_predicated[NUM_QREGS]; int qreg_log_idx; bool pre_commit; + TCGCond branch_cond; + target_ulong branch_dest; } DisasContext; static inline void ctx_log_reg_write(DisasContext *ctx, int rnum) diff --git a/target/hexagon/genptr.c b/target/hexagon/genptr.c index b8808ae17a..584e6415c0 100644 --- a/target/hexagon/genptr.c +++ b/target/hexagon/genptr.c @@ -484,7 +484,17 @@ static void gen_write_new_pc_pcrel(DisasContext *ctx, int pc_off, TCGCond cond, TCGv pred) { target_ulong dest = ctx->pkt->pc + pc_off; - gen_write_new_pc_addr(ctx, tcg_constant_tl(dest), cond, pred); + if (ctx->pkt->pkt_has_multi_cof) { + gen_write_new_pc_addr(ctx, tcg_constant_tl(dest), cond, pred); + } else { + /* Defer this jump to the end of the TB */ + ctx->branch_cond = TCG_COND_ALWAYS; + if (pred != NULL) { + ctx->branch_cond = cond; + tcg_gen_mov_tl(hex_branch_taken, pred); + } + ctx->branch_dest = dest; + } } static void gen_compare(TCGCond cond, TCGv res, TCGv arg1, TCGv arg2) diff --git a/target/hexagon/translate.c b/target/hexagon/translate.c index fa6415936c..8e5814a3ea 100644 --- a/target/hexagon/translate.c +++ b/target/hexagon/translate.c @@ -116,10 +116,41 @@ static void gen_exec_counters(DisasContext *ctx) hex_gpr[HEX_REG_QEMU_HVX_CNT], ctx->num_hvx_insns); } +static bool use_goto_tb(DisasContext *ctx, target_ulong dest) +{ + return translator_use_goto_tb(&ctx->base, dest); +} + +static void gen_goto_tb(DisasContext *ctx, int idx, target_ulong dest) +{ + if (use_goto_tb(ctx, dest)) { + tcg_gen_goto_tb(idx); + tcg_gen_movi_tl(hex_gpr[HEX_REG_PC], dest); + tcg_gen_exit_tb(ctx->base.tb, idx); + } else { + tcg_gen_movi_tl(hex_gpr[HEX_REG_PC], dest); + tcg_gen_lookup_and_goto_ptr(); + } +} + static void gen_end_tb(DisasContext *ctx) { gen_exec_counters(ctx); - tcg_gen_exit_tb(NULL, 0); + + if (ctx->branch_cond != TCG_COND_NEVER) { + if (ctx->branch_cond != TCG_COND_ALWAYS) { + TCGLabel *skip = gen_new_label(); + tcg_gen_brcondi_tl(ctx->branch_cond, hex_branch_taken, 0, skip); + gen_goto_tb(ctx, 0, ctx->branch_dest); + gen_set_label(skip); + gen_goto_tb(ctx, 1, ctx->next_PC); + } else { + gen_goto_tb(ctx, 0, ctx->branch_dest); + } + } else { + tcg_gen_lookup_and_goto_ptr(); + } + ctx->base.is_jmp = DISAS_NORETURN; } @@ -811,6 +842,8 @@ static void hexagon_tr_init_disas_context(DisasContextBase *dcbase, static void hexagon_tr_tb_start(DisasContextBase *db, CPUState *cpu) { + DisasContext *ctx = container_of(db, DisasContext, base); + ctx->branch_cond = TCG_COND_NEVER; } static void hexagon_tr_insn_start(DisasContextBase *dcbase, CPUState *cpu)