[{"id":3676409,"web_url":"http://patchwork.ozlabs.org/comment/3676409/","msgid":"","list_archive_url":null,"date":"2026-04-13T01:57:48","subject":"Re: [PATCH v3] ipa: honor memory clobbers in ipa-reference [PR124218]","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Sun, Apr 12, 2026 at 6:55 PM Chris Copeland wrote:\n>\n> Changes from v2: remove memory clobber from pr55665.C. This memory\n> clobber was being ignored in ipa without these changes, and leaving it\n> in now triggers a DWARF bug which is tracked by\n> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124864. This bug can be\n> reproduced without the changes in this 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> PR ipa/124218\n> * ipa-fnsummary.h (ipa_fn_summary): Add asm_memory_clobber field.\n> * ipa-fnsummary.cc (analyze_function_body): Set asm_memory_clobber\n> when a GIMPLE_ASM with a memory clobber is found.\n> (ipa_merge_fn_summary_after_inlining): Merge asm_memory_clobber.\n> (inline_read_section): Stream in asm_memory_clobber.\n> (ipa_fn_summary_write): Stream out asm_memory_clobber.\n> * ipa-reference.cc (analyze_function): Use asm_memory_clobber from\n> fn summary to mark all module statics as read and written.\n> * passes.def: Move pass_ipa_reference before pass_ipa_free_fn_summary.\n>\n> gcc/testsuite/ChangeLog:\n>\n> PR ipa/124218\n> * gcc.dg/ipa/pr124218.c: New test.\n> * g++.dg/guality/pr55665.C: Remove memory clobber. This memory clobber\n> was being ignored before, and leaving it in now triggers PR124864,\n> breaking the test. Correct PR number in first comment.\n> ---\n> gcc/ChangeLog | 13 +++++++++++\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/ChangeLog | 8 +++++++\n> gcc/testsuite/g++.dg/guality/pr55665.C | 4 ++--\n> gcc/testsuite/gcc.dg/ipa/pr124218.c | 30 ++++++++++++++++++++++++++\n> 8 files changed, 81 insertions(+), 4 deletions(-)\n> create mode 100644 gcc/testsuite/gcc.dg/ipa/pr124218.c\n>\n> diff --git a/gcc/ChangeLog b/gcc/ChangeLog\n> index 51f9c66b071..730423fb1f4 100644\n> --- a/gcc/ChangeLog\n> +++ b/gcc/ChangeLog\n> @@ -1,3 +1,16 @@\n> +2026-04-12 Chris Copeland \n> +\n> + PR ipa/124218\n> + * ipa-fnsummary.h (ipa_fn_summary): Add asm_memory_clobber field.\n> + * ipa-fnsummary.cc (analyze_function_body): Set asm_memory_clobber\n> + when a GIMPLE_ASM with a memory clobber is found.\n> + (ipa_merge_fn_summary_after_inlining): Merge asm_memory_clobber.\n> + (inline_read_section): Stream in asm_memory_clobber.\n> + (ipa_fn_summary_write): Stream out asm_memory_clobber.\n> + * ipa-reference.cc (analyze_function): Use asm_memory_clobber from\n> + fn summary to mark all module statics as read and written.\n> + * passes.def: Move pass_ipa_reference before pass_ipa_free_fn_summary.\n> +\n\nDon't add the change to the changelog as part of the patch/commit.\nChangelogs are auto generated from the commit message now.\n\nThanks,\nAndrea\n\n> 2026-04-11 Christopher Albert \n>\n> PR fortran/93554\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> }\n> }\n>\n> + if (!info->asm_memory_clobber\n> + && gimple_code (stmt) == GIMPLE_ASM\n> + && gimple_asm_clobbers_memory_p (as_a (stmt)))\n> + info->asm_memory_clobber = true;\n> +\n> /* For target specific information, we want to scan all statements\n> rather than those statements with non-zero weights, to avoid\n> 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> {\n> info->inlinable = bp_unpack_value (&bp, 1);\n> info->fp_expressions = bp_unpack_value (&bp, 1);\n> + info->asm_memory_clobber = bp_unpack_value (&bp, 1);\n> if (!lto_stream_offload_p)\n> info->target_info = streamer_read_uhwi (&ib);\n> }\n> else\n> {\n> + bp_unpack_value (&bp, 1);\n> bp_unpack_value (&bp, 1);\n> bp_unpack_value (&bp, 1);\n> if (!lto_stream_offload_p)\n> @@ -5084,6 +5092,7 @@ ipa_fn_summary_write (void)\n> bp = bitpack_create (ob->main_stream);\n> bp_pack_value (&bp, info->inlinable, 1);\n> bp_pack_value (&bp, info->fp_expressions, 1);\n> + bp_pack_value (&bp, info->asm_memory_clobber, 1);\n> streamer_write_bitpack (&bp);\n> if (!lto_stream_offload_p)\n> 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> }\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/ChangeLog b/gcc/testsuite/ChangeLog\n> index 14820bfe8fb..31243de6eb2 100644\n> --- a/gcc/testsuite/ChangeLog\n> +++ b/gcc/testsuite/ChangeLog\n> @@ -1,3 +1,11 @@\n> +2026-04-12 Chris Copeland \n> +\n> + PR ipa/124218\n> + * gcc.dg/ipa/pr124218.c: New test.\n> + * g++.dg/guality/pr55665.C: Remove memory clobber. This memory clobber\n> + was being ignored before, and leaving it in now triggers PR124864,\n> + breaking the test. Correct PR number in first comment.\n> +\n> 2026-04-11 Christopher Albert \n>\n> PR fortran/93554\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> + \"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=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=Hg4a/aTO;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=aaIo/wVf;\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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