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Mon, 06 May 2024 02:42:49 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 4462gllM007500 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 6 May 2024 02:42:47 GMT Received: from hu-bcain-lv.qualcomm.com (10.49.16.6) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 5 May 2024 19:42:47 -0700 From: Brian Cain To: CC: , , , , , , , , , , Subject: [PULL 01/15] Hexagon (target/hexagon) Analyze reads before writes Date: Sun, 5 May 2024 19:42:13 -0700 Message-ID: <20240506024227.3345791-2-bcain@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240506024227.3345791-1-bcain@quicinc.com> References: <20240506024227.3345791-1-bcain@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: sozzpi0KoDIpkNNFnT2mD78sZzuanZ5I X-Proofpoint-GUID: sozzpi0KoDIpkNNFnT2mD78sZzuanZ5I X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1011,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-05-05_17,2024-05-03_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 mlxscore=0 adultscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=564 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2404010003 definitions=main-2405060012 Received-SPF: pass client-ip=205.220.180.131; envelope-from=bcain@quicinc.com; helo=mx0b-0031df01.pphosted.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, 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 From: Taylor Simpson 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 Reviewed-by: Brian Cain Message-Id: <20240201103340.119081-2-ltaylorsimpson@gmail.com> Signed-off-by: Brian Cain --- target/hexagon/README | 9 +++-- target/hexagon/gen_analyze_funcs.py | 34 ++++++++++------ target/hexagon/hex_common.py | 63 +++++++++++++++-------------- target/hexagon/translate.h | 26 +++++++++++- 4 files changed, 83 insertions(+), 49 deletions(-) diff --git a/target/hexagon/README b/target/hexagon/README index 746ebec378..c1d8c8d0ab 100644 --- a/target/hexagon/README +++ b/target/hexagon/README @@ -183,10 +183,11 @@ when the override is present. } We also generate an analyze_ function for each instruction. Currently, -these functions record the writes to registers by calling ctx_log_*. During -gen_start_packet, we invoke the analyze_ function for each instruction in -the packet, and we mark the implicit writes. After the analysis is performed, -we initialize the result register for each of the predicated assignments. +these functions record the reads and writes to registers by calling ctx_log_*. +During gen_start_packet, we invoke the analyze_ function for each instruction in +the packet, and we mark the implicit writes. The analysis determines if the packet +semantics can be short-circuited. If not, we initialize the result register for each +of the predicated assignments. In addition to instruction semantics, we use a generator to create the decode tree. This generation is a four step process. diff --git a/target/hexagon/gen_analyze_funcs.py b/target/hexagon/gen_analyze_funcs.py index a9af666cef..890e6a3a95 100755 --- a/target/hexagon/gen_analyze_funcs.py +++ b/target/hexagon/gen_analyze_funcs.py @@ -1,7 +1,7 @@ #!/usr/bin/env python3 ## -## Copyright(c) 2022-2023 Qualcomm Innovation Center, Inc. All Rights Reserved. +## Copyright(c) 2022-2024 Qualcomm Innovation Center, Inc. All Rights Reserved. ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by @@ -44,15 +44,25 @@ def gen_analyze_func(f, tag, regs, imms): f.write(" Insn *insn G_GNUC_UNUSED = ctx->insn;\n") - i = 0 - ## Analyze all the registers - for regtype, regid in regs: - reg = hex_common.get_register(tag, regtype, regid) + ## Declare all the registers + for regno, register in enumerate(regs): + reg_type, reg_id = register + reg = hex_common.get_register(tag, reg_type, reg_id) + reg.decl_reg_num(f, regno) + + ## Analyze the register reads + for regno, register in enumerate(regs): + reg_type, reg_id = register + reg = hex_common.get_register(tag, reg_type, reg_id) + if reg.is_read(): + reg.analyze_read(f, regno) + + ## Analyze the register writes + for regno, register in enumerate(regs): + reg_type, reg_id = register + reg = hex_common.get_register(tag, reg_type, reg_id) if reg.is_written(): - reg.analyze_write(f, tag, i) - else: - reg.analyze_read(f, i) - i += 1 + reg.analyze_write(f, tag, regno) has_generated_helper = not hex_common.skip_qemu_helper( tag @@ -89,13 +99,13 @@ def main(): tagimms = hex_common.get_tagimms() 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_C_INC\n") + f.write("#define HEXAGON_ANALYZE_FUNCS_C_INC\n\n") for tag in hex_common.tags: gen_analyze_func(f, tag, tagregs[tag], tagimms[tag]) - f.write("#endif /* HEXAGON_TCG_FUNCS_H */\n") + f.write("#endif /* HEXAGON_ANALYZE_FUNCS_C_INC */\n") if __name__ == "__main__": diff --git a/target/hexagon/hex_common.py b/target/hexagon/hex_common.py index 195620c7ec..33801e4bd7 100755 --- a/target/hexagon/hex_common.py +++ b/target/hexagon/hex_common.py @@ -1,7 +1,7 @@ #!/usr/bin/env python3 ## -## Copyright(c) 2019-2023 Qualcomm Innovation Center, Inc. All Rights Reserved. +## Copyright(c) 2019-2024 Qualcomm Innovation Center, Inc. All Rights Reserved. ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by @@ -425,7 +425,6 @@ def log_write(self, f, tag): gen_log_reg_write(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ ctx_log_reg_write(ctx, {self.reg_num}, {predicated}); @@ -438,7 +437,6 @@ def decl_tcg(self, f, tag, regno): TCGv {self.reg_tcg()} = hex_gpr[{self.reg_num}]; """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_reg_read(ctx, {self.reg_num}); """)) @@ -449,9 +447,8 @@ def decl_tcg(self, f, tag, regno): TCGv {self.reg_tcg()} = get_result_gpr(ctx, insn->regno[{regno}]); """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ - ctx_log_reg_read(ctx, {self.reg_num}); + ctx_log_reg_read_new(ctx, {self.reg_num}); """)) class GprReadWrite(Register, Single, ReadWrite): @@ -471,8 +468,11 @@ def log_write(self, f, tag): f.write(code_fmt(f"""\ gen_log_reg_write(ctx, {self.reg_num}, {self.reg_tcg()}); """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_reg_read(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ ctx_log_reg_write(ctx, {self.reg_num}, {predicated}); @@ -493,7 +493,6 @@ def log_write(self, f, tag): gen_write_ctrl_reg(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ ctx_log_reg_write(ctx, {self.reg_num}, {predicated}); @@ -511,7 +510,6 @@ def decl_tcg(self, f, tag, regno): gen_read_ctrl_reg(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_reg_read(ctx, {self.reg_num}); """)) @@ -532,7 +530,6 @@ def idef_arg(self, declared): declared.append(self.reg_tcg()) declared.append("CS") def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_reg_read(ctx, {self.reg_num}); """)) @@ -548,7 +545,6 @@ def log_write(self, f, tag): gen_log_pred_write(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_pred_write(ctx, {self.reg_num}); """)) @@ -560,7 +556,6 @@ def decl_tcg(self, f, tag, regno): TCGv {self.reg_tcg()} = hex_pred[{self.reg_num}]; """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_pred_read(ctx, {self.reg_num}); """)) @@ -571,9 +566,8 @@ def decl_tcg(self, f, tag, regno): TCGv {self.reg_tcg()} = get_result_pred(ctx, insn->regno[{regno}]); """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ - ctx_log_pred_read(ctx, {self.reg_num}); + ctx_log_pred_read_new(ctx, {self.reg_num}); """)) class PredReadWrite(Register, Single, ReadWrite): @@ -587,8 +581,11 @@ def log_write(self, f, tag): f.write(code_fmt(f"""\ gen_log_pred_write(ctx, {self.reg_num}, {self.reg_tcg()}); """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_pred_read(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_pred_write(ctx, {self.reg_num}); """)) @@ -605,7 +602,6 @@ def log_write(self, f, tag): gen_log_reg_write_pair(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ ctx_log_reg_write_pair(ctx, {self.reg_num}, {predicated}); @@ -621,7 +617,6 @@ def decl_tcg(self, f, tag, regno): hex_gpr[{self.reg_num} + 1]); """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_reg_read_pair(ctx, {self.reg_num}); """)) @@ -640,8 +635,11 @@ def log_write(self, f, tag): f.write(code_fmt(f"""\ gen_log_reg_write_pair(ctx, {self.reg_num}, {self.reg_tcg()}); """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_reg_read_pair(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ ctx_log_reg_write_pair(ctx, {self.reg_num}, {predicated}); @@ -663,7 +661,6 @@ def log_write(self, f, tag): gen_write_ctrl_reg_pair(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ ctx_log_reg_write_pair(ctx, {self.reg_num}, {predicated}); @@ -681,7 +678,6 @@ def decl_tcg(self, f, tag, regno): gen_read_ctrl_reg_pair(ctx, {self.reg_num}, {self.reg_tcg()}); """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_reg_read_pair(ctx, {self.reg_num}); """)) @@ -705,7 +701,6 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMVector *)({self.helper_arg_name()}) */ """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) newv = hvx_newv(tag) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ @@ -728,7 +723,6 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMVector *)({self.helper_arg_name()}) */ """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_vreg_read(ctx, {self.reg_num}); """)) @@ -746,9 +740,8 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMVector *)({self.helper_arg_name()}) */ """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ - ctx_log_vreg_read(ctx, {self.reg_num}); + ctx_log_vreg_read_new(ctx, {self.reg_num}); """)) class VRegReadWrite(Register, Hvx, ReadWrite): @@ -772,8 +765,11 @@ def helper_hvx_desc(self, f): f.write(code_fmt(f"""\ /* {self.reg_tcg()} is *(MMVector *)({self.helper_arg_name()}) */ """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_vreg_read(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) newv = hvx_newv(tag) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ @@ -803,8 +799,11 @@ def helper_hvx_desc(self, f): f.write(code_fmt(f"""\ /* {self.reg_tcg()} is *(MMVector *)({self.helper_arg_name()}) */ """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_vreg_read(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) newv = hvx_newv(tag) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ @@ -830,7 +829,6 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMVectorPair *)({self.helper_arg_name()}) */ """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) newv = hvx_newv(tag) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ @@ -860,7 +858,6 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMVectorPair *)({self.helper_arg_name()}) */ """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_vreg_read_pair(ctx, {self.reg_num}); """)) @@ -892,8 +889,11 @@ def helper_hvx_desc(self, f): f.write(code_fmt(f"""\ /* {self.reg_tcg()} is *(MMVectorPair *)({self.helper_arg_name()}) */ """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_vreg_read_pair(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) newv = hvx_newv(tag) predicated = "true" if is_predicated(tag) else "false" f.write(code_fmt(f"""\ @@ -919,7 +919,6 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMQReg *)({self.helper_arg_name()}) */ """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_qreg_write(ctx, {self.reg_num}); """)) @@ -941,7 +940,6 @@ def helper_hvx_desc(self, f): /* {self.reg_tcg()} is *(MMQReg *)({self.helper_arg_name()}) */ """)) def analyze_read(self, f, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_qreg_read(ctx, {self.reg_num}); """)) @@ -967,8 +965,11 @@ def helper_hvx_desc(self, f): f.write(code_fmt(f"""\ /* {self.reg_tcg()} is *(MMQReg *)({self.helper_arg_name()}) */ """)) + def analyze_read(self, f, regno): + f.write(code_fmt(f"""\ + ctx_log_qreg_read(ctx, {self.reg_num}); + """)) def analyze_write(self, f, tag, regno): - self.decl_reg_num(f, regno) f.write(code_fmt(f"""\ ctx_log_qreg_write(ctx, {self.reg_num}); """)) diff --git a/target/hexagon/translate.h b/target/hexagon/translate.h index 4dd59c6726..f06d71fc53 100644 --- a/target/hexagon/translate.h +++ b/target/hexagon/translate.h @@ -1,5 +1,5 @@ /* - * Copyright(c) 2019-2023 Qualcomm Innovation Center, Inc. All Rights Reserved. + * Copyright(c) 2019-2024 Qualcomm Innovation Center, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -75,6 +75,8 @@ typedef struct DisasContext { TCGv dczero_addr; } DisasContext; +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); } +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); } +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); } +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]; -bool is_gather_store_insn(DisasContext *ctx); void process_store(DisasContext *ctx, int slot_num); FIELD(PROBE_PKT_SCALAR_STORE_S0, MMU_IDX, 0, 2)