[{"id":3678409,"web_url":"http://patchwork.ozlabs.org/comment/3678409/","msgid":"","list_archive_url":null,"date":"2026-04-16T22:18:04","subject":"Re: [PATCH v4] ipa: honor memory clobbers in ipa-reference [PR124218]","submitter":{"id":88921,"url":"http://patchwork.ozlabs.org/api/people/88921/","name":"Kugan Vivekanandarajah","email":"kvivekananda@nvidia.com"},"content":"Hi,\n\n\n> On 15 Apr 2026, at 5:19 pm, Chris Copeland wrote:\n> \n> +#include \"tree-vrp.h\"\n> +#include \"sreal.h\"\n> +#include \"ipa-cp.h\"\n> +#include \"ipa-prop.h”\n\nDo we need these headers?\n\nThanks,\nKugan","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=rMHeyaJC;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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charset=utf-8","Content-Transfer-Encoding":"quoted-printable","From":"Chris Copeland ","Mime-Version":"1.0 (1.0)","Subject":"Re: [PATCH v4] ipa: honor memory clobbers in ipa-reference [PR124218]","Date":"Thu, 16 Apr 2026 16:01:19 -0700","Message-Id":"<2D0A6A7D-6CF6-4702-9802-1EE51FD94F50@chrisnc.net>","References":"","Cc":"gcc-patches@gcc.gnu.org","In-Reply-To":"","To":"Kugan Vivekanandarajah ","X-Mailer":"iPhone Mail (23E254)","X-Authority-Info-Out":"v=2.4 cv=U/qfzOru c=1 sm=1 tr=0 ts=69e16a4b\n cx=c_apl:c_pps:t_out a=qkKslKyYc0ctBTeLUVfTFg==:117 a=IkcTkHD0fZMA:10\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Ikd4Dj_1AAAA:8 a=EJHnG6ylAAAA:8\n a=wr4gfqvqRWNyhMbEmEMA:9 a=QEXdDO2ut3YA:10 a=3Es6Gil5AuxR-dLjfNE0:22","X-Proofpoint-GUID":"6bWYLNB4qfEbRuenge-J81kLkX49al5q","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDE2MDIxOCBTYWx0ZWRfX4ghkLQjrAqSn\n ndkLR9BNUBCzC7QmW0nfZD0rjz1oU8jM7rOyJM+EeNsT1WNxj+2lgbPTE6nYTR7kpICPcsTCSRg\n zeLRbOeaCVzgmKiSCbYoNwyZPSxvsRQ15VffyGNsoG5lAH8yZKPqnAJtMszV46MNRrtOeLEOHYd\n vrbgkIZWyJcVYF7pQQ+OivxTg9F/dxt1BIdiIug89r1ht6q1HIfnLLetUFHMrVl/evtVHn5xZT/\n hCvmde4IWcKebEbxciB2jMRIM+ipgSlTfhdqJoPyB07olWbvwPJiO1kJdnBQGP2Xe9hI1/Wc2iR\n qcX/GtxVurhZEMx2/gOZ8B8t8EFioA+Ewwp3LgwOXNsTC1yhA9teChTrSH4dTI=","X-Proofpoint-ORIG-GUID":"6bWYLNB4qfEbRuenge-J81kLkX49al5q","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-16_03,2026-04-16_03,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=notspam policy=default score=0\n lowpriorityscore=0 clxscore=1030 phishscore=0 mlxlogscore=550 spamscore=0\n adultscore=0 mlxscore=0 bulkscore=0 malwarescore=0 suspectscore=0\n classifier=spam authscore=0 adjust=0 reason=mlx scancount=1\n engine=8.22.0-2601150000 definitions=main-2604160218","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3681559,"web_url":"http://patchwork.ozlabs.org/comment/3681559/","msgid":"","list_archive_url":null,"date":"2026-04-23T16:10:08","subject":"Re: [PATCH v4] ipa: honor memory clobbers in ipa-reference [PR124218]","submitter":{"id":92775,"url":"http://patchwork.ozlabs.org/api/people/92775/","name":"Chris Copeland","email":"chris@chrisnc.net"},"content":"Bumping this with the reviewers of v1 to request any other feedback.\n\nThanks,\nChris\n\n> On Apr 15, 2026, at 12:19 AM, Chris Copeland wrote:\n> \n> v4: Remove ChangeLog edits from the patch.\n> \n> ---\n> \n> Record the presence of asm memory clobbers in ipa_fn_summary and use it\n> in ipa-reference's analyze_function to mark all module statics as read\n> and written. Move pass_ipa_reference before pass_ipa_free_fn_summary so\n> the summary is still available when needed.\n> \n> gcc/ChangeLog:\n> \n> \tPR ipa/124218\n> \t* ipa-fnsummary.h (ipa_fn_summary): Add asm_memory_clobber field.\n> \t* ipa-fnsummary.cc (analyze_function_body): Set asm_memory_clobber\n> \twhen a GIMPLE_ASM with a memory clobber is found.\n> \t(ipa_merge_fn_summary_after_inlining): Merge asm_memory_clobber.\n> \t(inline_read_section): Stream in asm_memory_clobber.\n> \t(ipa_fn_summary_write): Stream out asm_memory_clobber.\n> \t* ipa-reference.cc (analyze_function): Use asm_memory_clobber from\n> \tfn summary to mark all module statics as read and written.\n> \t* passes.def: Move pass_ipa_reference before pass_ipa_free_fn_summary.\n> \n> gcc/testsuite/ChangeLog:\n> \n> \tPR ipa/124218\n> \t* gcc.dg/ipa/pr124218.c: New test.\n> \t* g++.dg/guality/pr55665.C: Remove memory clobber. This memory clobber\n> \twas being ignored before, and leaving it in now triggers PR124864,\n> \tbreaking the test. Correct PR number in first comment.\n> ---\n> gcc/ipa-fnsummary.cc | 9 ++++++++\n> gcc/ipa-fnsummary.h | 6 +++++-\n> gcc/ipa-reference.cc | 13 +++++++++++\n> gcc/passes.def | 2 +-\n> gcc/testsuite/g++.dg/guality/pr55665.C | 4 ++--\n> gcc/testsuite/gcc.dg/ipa/pr124218.c | 30 ++++++++++++++++++++++++++\n> 6 files changed, 60 insertions(+), 4 deletions(-)\n> create mode 100644 gcc/testsuite/gcc.dg/ipa/pr124218.c\n> \n> diff --git a/gcc/ipa-fnsummary.cc b/gcc/ipa-fnsummary.cc\n> index e187231dfb6..2e1387ec746 100644\n> --- a/gcc/ipa-fnsummary.cc\n> +++ b/gcc/ipa-fnsummary.cc\n> @@ -3200,6 +3200,11 @@ analyze_function_body (struct cgraph_node *node, bool early)\n> \t\t}\n> \t }\n> \n> +\t if (!info->asm_memory_clobber\n> +\t && gimple_code (stmt) == GIMPLE_ASM\n> +\t && gimple_asm_clobbers_memory_p (as_a (stmt)))\n> +\t info->asm_memory_clobber = true;\n> +\n> \t /* For target specific information, we want to scan all statements\n> \t rather than those statements with non-zero weights, to avoid\n> \t missing to scan something interesting for target information,\n> @@ -4492,6 +4497,7 @@ ipa_merge_fn_summary_after_inlining (struct cgraph_edge *edge)\n> toplev_predicate = true;\n> \n> info->fp_expressions |= callee_info->fp_expressions;\n> + info->asm_memory_clobber |= callee_info->asm_memory_clobber;\n> info->target_info |= callee_info->target_info;\n> \n> if (callee_info->conds)\n> @@ -4838,11 +4844,13 @@ inline_read_section (struct lto_file_decl_data *file_data, const char *data,\n> \t{\n> \t info->inlinable = bp_unpack_value (&bp, 1);\n> \t info->fp_expressions = bp_unpack_value (&bp, 1);\n> +\t info->asm_memory_clobber = bp_unpack_value (&bp, 1);\n> \t if (!lto_stream_offload_p)\n> \t info->target_info = streamer_read_uhwi (&ib);\n> \t}\n> else\n> \t{\n> +\t bp_unpack_value (&bp, 1);\n> \t bp_unpack_value (&bp, 1);\n> \t bp_unpack_value (&bp, 1);\n> \t if (!lto_stream_offload_p)\n> @@ -5084,6 +5092,7 @@ ipa_fn_summary_write (void)\n> \t bp = bitpack_create (ob->main_stream);\n> \t bp_pack_value (&bp, info->inlinable, 1);\n> \t bp_pack_value (&bp, info->fp_expressions, 1);\n> +\t bp_pack_value (&bp, info->asm_memory_clobber, 1);\n> \t streamer_write_bitpack (&bp);\n> \t if (!lto_stream_offload_p)\n> \t streamer_write_uhwi (ob, info->target_info);\n> diff --git a/gcc/ipa-fnsummary.h b/gcc/ipa-fnsummary.h\n> index de7b7f61cb1..896cb6c1725 100644\n> --- a/gcc/ipa-fnsummary.h\n> +++ b/gcc/ipa-fnsummary.h\n> @@ -126,7 +126,8 @@ public:\n> ipa_fn_summary ()\n> : min_size (0),\n> inlinable (false), single_caller (false),\n> - fp_expressions (false), safe_to_inline_to_always_inline (0),\n> + fp_expressions (false), asm_memory_clobber (false),\n> + safe_to_inline_to_always_inline (0),\n> target_info (0), estimated_stack_size (false),\n> time (0), conds (NULL),\n> size_time_table (), call_size_time_table (vNULL),\n> @@ -141,6 +142,7 @@ public:\n> : min_size (s.min_size),\n> inlinable (s.inlinable), single_caller (s.single_caller),\n> fp_expressions (s.fp_expressions),\n> + asm_memory_clobber (s.asm_memory_clobber),\n> target_info (s.target_info),\n> estimated_stack_size (s.estimated_stack_size),\n> time (s.time), conds (s.conds), size_time_table (),\n> @@ -165,6 +167,8 @@ public:\n> unsigned int single_caller : 1;\n> /* True if function contains any floating point expressions. */\n> unsigned int fp_expressions : 1;\n> + /* True if function contains an asm statement that clobbers memory. */\n> + unsigned int asm_memory_clobber : 1;\n> /* Cache for analysis of can_early_inline_edge_p. */\n> unsigned int safe_to_inline_to_always_inline : 2;\n> /* Like fp_expressions field above, but it's to hold some target specific\n> diff --git a/gcc/ipa-reference.cc b/gcc/ipa-reference.cc\n> index c5699312c8f..12b593b0f50 100644\n> --- a/gcc/ipa-reference.cc\n> +++ b/gcc/ipa-reference.cc\n> @@ -50,6 +50,11 @@ along with GCC; see the file COPYING3. If not see\n> #include \"ipa-reference.h\"\n> #include \"alloc-pool.h\"\n> #include \"symbol-summary.h\"\n> +#include \"tree-vrp.h\"\n> +#include \"sreal.h\"\n> +#include \"ipa-cp.h\"\n> +#include \"ipa-prop.h\"\n> +#include \"ipa-fnsummary.h\"\n> \n> /* The static variables defined within the compilation unit that are\n> loaded or stored directly by function that owns this structure. */\n> @@ -507,6 +512,7 @@ analyze_function (struct cgraph_node *fn)\n> {\n> ipa_reference_local_vars_info_t local;\n> struct ipa_ref *ref = NULL;\n> + ipa_fn_summary *sum;\n> int i;\n> tree var;\n> \n> @@ -548,6 +554,13 @@ analyze_function (struct cgraph_node *fn)\n> \t}\n> }\n> \n> + sum = ipa_fn_summaries->get (fn);\n> + if (sum && sum->asm_memory_clobber)\n> + {\n> + local->statics_read = all_module_statics;\n> + local->statics_written = all_module_statics;\n> + }\n> +\n> if (fn->cannot_return_p ())\n> bitmap_clear (local->statics_written);\n> }\n> diff --git a/gcc/passes.def b/gcc/passes.def\n> index cdddb87302f..8344ea1a584 100644\n> --- a/gcc/passes.def\n> +++ b/gcc/passes.def\n> @@ -176,8 +176,8 @@ along with GCC; see the file COPYING3. If not see\n> NEXT_PASS (pass_ipa_locality_cloning);\n> NEXT_PASS (pass_ipa_pure_const);\n> NEXT_PASS (pass_ipa_modref);\n> - NEXT_PASS (pass_ipa_free_fn_summary, false /* small_p */);\n> NEXT_PASS (pass_ipa_reference);\n> + NEXT_PASS (pass_ipa_free_fn_summary, false /* small_p */);\n> /* This pass needs to be scheduled after any IP code duplication. */\n> NEXT_PASS (pass_ipa_single_use);\n> /* Comdat privatization come last, as direct references to comdat local\n> diff --git a/gcc/testsuite/g++.dg/guality/pr55665.C b/gcc/testsuite/g++.dg/guality/pr55665.C\n> index 16c6d281661..d100d0abc29 100644\n> --- a/gcc/testsuite/g++.dg/guality/pr55665.C\n> +++ b/gcc/testsuite/g++.dg/guality/pr55665.C\n> @@ -1,4 +1,4 @@\n> -// PR debug/55655\n> +// PR debug/55665\n> // { dg-do run }\n> // { dg-options \"-g\" }\n> \n> @@ -14,7 +14,7 @@ bar (void)\n> __attribute__((noinline, noclone)) void\n> foo (int x)\n> {\n> - __asm volatile (\"\" : : \"r\" (x) : \"memory\");\n> + __asm volatile (\"\" : : \"r\" (x));\n> }\n> \n> A::A (int x)\n> diff --git a/gcc/testsuite/gcc.dg/ipa/pr124218.c b/gcc/testsuite/gcc.dg/ipa/pr124218.c\n> new file mode 100644\n> index 00000000000..67e95914d6b\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.dg/ipa/pr124218.c\n> @@ -0,0 +1,30 @@\n> +/* { dg-do run { target arm*-*-eabi* } } */\n> +/* { dg-options \"-O1 -fwhole-program\" } */\n> +\n> +/* PR ipa/124218: ipa-reference must honor memory clobbers in inline asm. */\n> +\n> +int flag;\n> +\n> +__attribute__ ((used))\n> +void\n> +asm_set (void)\n> +{\n> + flag = 1;\n> +}\n> +\n> +__attribute__ ((noinline))\n> +static void\n> +clobber_and_set (void)\n> +{\n> + __asm__ volatile (\"bl asm_set\" ::: \"r0\", \"r1\", \"r2\", \"r3\",\n> +\t\t \"ip\", \"lr\", \"memory\", \"cc\");\n> +}\n> +\n> +int main (void)\n> +{\n> + flag = 0;\n> + clobber_and_set ();\n> + if (!flag)\n> + __builtin_abort ();\n> + return 0;\n> +}\n> -- \n> 2.53.0\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=chrisnc.net header.i=@chrisnc.net header.a=rsa-sha256\n header.s=sig1 header.b=Qp/pqD2G;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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