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GET /api/patches/2226764/?format=api
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{
    "id": 2226764,
    "url": "http://patchwork.ozlabs.org/api/patches/2226764/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhup4p5wp2.gcc.gcc-TEST.pinskia.84.1.7@forge-stage.sourceware.org/",
    "project": {
        "id": 17,
        "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api",
        "name": "GNU Compiler Collection",
        "link_name": "gcc",
        "list_id": "gcc-patches.gcc.gnu.org",
        "list_email": "gcc-patches@gcc.gnu.org",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null,
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<bmm.hhup4p5wp2.gcc.gcc-TEST.pinskia.84.1.7@forge-stage.sourceware.org>",
    "list_archive_url": null,
    "date": "2026-04-22T18:49:15",
    "name": "[v1,07/10] fab/gimple-fold/forwprop: Move va_args folding to gimple_fold [PR121762]",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "6e7a46c503b1d793401820665d4ce5086c928190",
    "submitter": {
        "id": 93219,
        "url": "http://patchwork.ozlabs.org/api/people/93219/?format=api",
        "name": "Andrew Pinski via Sourceware Forge",
        "email": "forge-bot+pinskia@forge-stage.sourceware.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhup4p5wp2.gcc.gcc-TEST.pinskia.84.1.7@forge-stage.sourceware.org/mbox/",
    "series": [
        {
            "id": 501092,
            "url": "http://patchwork.ozlabs.org/api/series/501092/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=501092",
            "date": "2026-04-22T18:49:11",
            "name": "remove_fab",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/501092/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2226764/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2226764/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>",
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        "ARC-Authentication-Results": "i=1; server2.sourceware.org",
        "From": "Andrew Pinski via Sourceware Forge\n <forge-bot+pinskia@forge-stage.sourceware.org>",
        "Date": "Wed, 22 Apr 2026 18:49:15 +0000",
        "Subject": "[PATCH v1 07/10] fab/gimple-fold/forwprop: Move va_args folding to\n gimple_fold [PR121762]",
        "To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>",
        "Message-ID": "\n <bmm.hhup4p5wp2.gcc.gcc-TEST.pinskia.84.1.7@forge-stage.sourceware.org>",
        "X-Mailer": "batrachomyomachia",
        "X-Pull-Request-Organization": "gcc",
        "X-Pull-Request-Repository": "gcc-TEST",
        "X-Pull-Request": "https://forge.sourceware.org/gcc/gcc-TEST/pulls/84",
        "References": "\n <bmm.hhup4p5wp2.gcc.gcc-TEST.pinskia.84.1.0@forge-stage.sourceware.org>",
        "In-Reply-To": "\n <bmm.hhup4p5wp2.gcc.gcc-TEST.pinskia.84.1.0@forge-stage.sourceware.org>",
        "X-Patch-URL": "\n https://forge.sourceware.org/pinskia/gcc-TEST/commit/e37cc329b2fbb4520cfd1fb1c6f58e5f161dc627",
        "X-BeenThere": "gcc-patches@gcc.gnu.org",
        "X-Mailman-Version": "2.1.30",
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        "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>",
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        "Reply-To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>,\n pinskia@gcc.gnu.org",
        "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"
    },
    "content": "From: Andrew Pinski <andrew.pinski@oss.qualcomm.com>\n\nThis moves the va_args functions folding to gimple-fold. Right now this is still\nkept for the last folding but later it can move sometime after stdargs pass is run by\nchecking PROP_gimple_lva instead.\nAlso for forwprop, if a folding happens for the last folding we need to maybe update the\nvariables as non-addressable like what is done in fab. It was originally added in fab for\n__builtin_sincos->__builtin_cexpi folding (PR39643). After the removal of fab, this will\nalso be the last pass which updates address taken too.\n\ngcc/ChangeLog:\n\n\t* gimple-fold.cc (gimple_fold_builtin_stdarg): New function,\n\tmoved from tree-ssa-ccp.cc (optimize_stdarg_builtin).\n\t(gimple_fold_builtin): Call gimple_fold_builtin_stdarg for\n\tva_start, va_copy and va_end.\n\t* tree-ssa-ccp.cc (optimize_stdarg_builtin): Remove.\n\t(pass_fold_builtins::execute): Remove handling of\n\tva_start, va_copy and va_end.\n\t* tree-ssa-forwprop.cc (pass_forwprop::execute): Update\n\ttodos if fold_stmt return true if last forwprop to include\n\tTODO_update_address_taken.\n\nSigned-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>\n---\n gcc/gimple-fold.cc       | 125 ++++++++++++++++++++++++++++++++++++++\n gcc/tree-ssa-ccp.cc      | 126 ---------------------------------------\n gcc/tree-ssa-forwprop.cc |   5 ++\n 3 files changed, 130 insertions(+), 126 deletions(-)",
    "diff": "diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc\nindex a12fb5e8eab1..2f64de2fb414 100644\n--- a/gcc/gimple-fold.cc\n+++ b/gcc/gimple-fold.cc\n@@ -5252,6 +5252,127 @@ gimple_fold_builtin_assume_aligned (gimple_stmt_iterator *gsi)\n   return true;\n }\n \n+/* If va_list type is a simple pointer and nothing special is needed,\n+   optimize __builtin_va_start (&ap, 0) into ap = __builtin_next_arg (0),\n+   __builtin_va_end (&ap) out as NOP and __builtin_va_copy into a simple\n+   pointer assignment.  Returns true if a change happened.  */\n+\n+static bool\n+gimple_fold_builtin_stdarg (gimple_stmt_iterator *gsi, gcall *call)\n+{\n+  /* These shouldn't be folded before pass_stdarg.  */\n+  if (!(cfun->curr_properties & PROP_last_full_fold))\n+    return false;\n+\n+  tree callee, lhs, rhs, cfun_va_list;\n+  bool va_list_simple_ptr;\n+  location_t loc = gimple_location (call);\n+  gimple *nstmt0, *nstmt;\n+  tree tlhs, oldvdef, newvdef;\n+\n+  callee = gimple_call_fndecl (call);\n+\n+  cfun_va_list = targetm.fn_abi_va_list (callee);\n+  va_list_simple_ptr = POINTER_TYPE_P (cfun_va_list)\n+\t\t       && (TREE_TYPE (cfun_va_list) == void_type_node\n+\t\t\t   || TREE_TYPE (cfun_va_list) == char_type_node);\n+\n+  switch (DECL_FUNCTION_CODE (callee))\n+    {\n+    case BUILT_IN_VA_START:\n+      if (!va_list_simple_ptr\n+\t  || targetm.expand_builtin_va_start != NULL\n+\t  || !builtin_decl_explicit_p (BUILT_IN_NEXT_ARG))\n+\treturn false;\n+\n+      if (gimple_call_num_args (call) != 2)\n+\treturn false;\n+\n+      lhs = gimple_call_arg (call, 0);\n+      if (!POINTER_TYPE_P (TREE_TYPE (lhs))\n+\t  || TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (lhs)))\n+\t     != TYPE_MAIN_VARIANT (cfun_va_list))\n+\treturn false;\n+      /* Create `tlhs = __builtin_next_arg(0);`. */\n+      tlhs = make_ssa_name (cfun_va_list);\n+      nstmt0 = gimple_build_call (builtin_decl_explicit (BUILT_IN_NEXT_ARG), 1, integer_zero_node);\n+      lhs = fold_build2 (MEM_REF, cfun_va_list, lhs, build_zero_cst (TREE_TYPE (lhs)));\n+      gimple_call_set_lhs (nstmt0, tlhs);\n+      gimple_set_location (nstmt0, loc);\n+      gimple_move_vops (nstmt0, call);\n+      gsi_replace (gsi, nstmt0, false);\n+      oldvdef = gimple_vdef (nstmt0);\n+      newvdef = make_ssa_name (gimple_vop (cfun), nstmt0);\n+      gimple_set_vdef (nstmt0, newvdef);\n+\n+      /* Create `*lhs = tlhs;`.  */\n+      nstmt = gimple_build_assign (lhs, tlhs);\n+      gimple_set_location (nstmt, loc);\n+      gimple_set_vuse (nstmt, newvdef);\n+      gimple_set_vdef (nstmt, oldvdef);\n+      SSA_NAME_DEF_STMT (oldvdef) = nstmt;\n+      gsi_insert_after (gsi, nstmt, GSI_NEW_STMT);\n+\n+      if (dump_file && (dump_flags & TDF_DETAILS))\n+\t{\n+\t  fprintf (dump_file, \"Simplified\\n  \");\n+\t  print_gimple_stmt (dump_file, call, 0, dump_flags);\n+\t  fprintf (dump_file, \"into\\n  \");\n+\t  print_gimple_stmt (dump_file, nstmt0, 0, dump_flags);\n+\t  fprintf (dump_file, \"  \");\n+\t  print_gimple_stmt (dump_file, nstmt, 0, dump_flags);\n+\t}\n+      return true;\n+\n+    case BUILT_IN_VA_COPY:\n+      if (!va_list_simple_ptr)\n+\treturn false;\n+\n+      if (gimple_call_num_args (call) != 2)\n+\treturn false;\n+\n+      lhs = gimple_call_arg (call, 0);\n+      if (!POINTER_TYPE_P (TREE_TYPE (lhs))\n+\t  || TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (lhs)))\n+\t     != TYPE_MAIN_VARIANT (cfun_va_list))\n+\treturn false;\n+      rhs = gimple_call_arg (call, 1);\n+      if (TYPE_MAIN_VARIANT (TREE_TYPE (rhs))\n+\t  != TYPE_MAIN_VARIANT (cfun_va_list))\n+\treturn false;\n+\n+      lhs = fold_build2 (MEM_REF, cfun_va_list, lhs, build_zero_cst (TREE_TYPE (lhs)));\n+      nstmt = gimple_build_assign (lhs, rhs);\n+      gimple_set_location (nstmt, loc);\n+      gimple_move_vops (nstmt, call);\n+      gsi_replace (gsi, nstmt, false);\n+\n+      if (dump_file && (dump_flags & TDF_DETAILS))\n+\t{\n+\t  fprintf (dump_file, \"Simplified\\n  \");\n+\t  print_gimple_stmt (dump_file, call, 0, dump_flags);\n+\t  fprintf (dump_file, \"into\\n  \");\n+\t  print_gimple_stmt (dump_file, nstmt, 0, dump_flags);\n+\t}\n+      return true;\n+\n+    case BUILT_IN_VA_END:\n+      /* No effect, so the statement will be deleted.  */\n+      if (dump_file && (dump_flags & TDF_DETAILS))\n+\t{\n+\t  fprintf (dump_file, \"Removed\\n  \");\n+\t  print_gimple_stmt (dump_file, call, 0, dump_flags);\n+\t}\n+      unlink_stmt_vdef (call);\n+      release_defs (call);\n+      gsi_replace (gsi, gimple_build_nop (), true);\n+      return true;\n+\n+    default:\n+      gcc_unreachable ();\n+    }\n+}\n+\n /* Fold the non-target builtin at *GSI and return whether any simplification\n    was made.  */\n \n@@ -5270,6 +5391,10 @@ gimple_fold_builtin (gimple_stmt_iterator *gsi)\n   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);\n   switch (fcode)\n     {\n+    case BUILT_IN_VA_START:\n+    case BUILT_IN_VA_END:\n+    case BUILT_IN_VA_COPY:\n+      return gimple_fold_builtin_stdarg (gsi, stmt);\n     case BUILT_IN_BCMP:\n       return gimple_fold_builtin_bcmp (gsi);\n     case BUILT_IN_BCOPY:\ndiff --git a/gcc/tree-ssa-ccp.cc b/gcc/tree-ssa-ccp.cc\nindex b69a8b64a61b..2d16395ac68e 100644\n--- a/gcc/tree-ssa-ccp.cc\n+++ b/gcc/tree-ssa-ccp.cc\n@@ -3085,124 +3085,6 @@ make_pass_ccp (gcc::context *ctxt)\n   return new pass_ccp (ctxt);\n }\n \n-/* If va_list type is a simple pointer and nothing special is needed,\n-   optimize __builtin_va_start (&ap, 0) into ap = __builtin_next_arg (0),\n-   __builtin_va_end (&ap) out as NOP and __builtin_va_copy into a simple\n-   pointer assignment.  Returns true if a change happened.  */\n-\n-static bool\n-optimize_stdarg_builtin (gimple_stmt_iterator *gsi, gimple *call)\n-{\n-  tree callee, lhs, rhs, cfun_va_list;\n-  bool va_list_simple_ptr;\n-  location_t loc = gimple_location (call);\n-  gimple *nstmt0, *nstmt;\n-  tree tlhs, oldvdef, newvdef;\n-\n-  callee = gimple_call_fndecl (call);\n-\n-  cfun_va_list = targetm.fn_abi_va_list (callee);\n-  va_list_simple_ptr = POINTER_TYPE_P (cfun_va_list)\n-\t\t       && (TREE_TYPE (cfun_va_list) == void_type_node\n-\t\t\t   || TREE_TYPE (cfun_va_list) == char_type_node);\n-\n-  switch (DECL_FUNCTION_CODE (callee))\n-    {\n-    case BUILT_IN_VA_START:\n-      if (!va_list_simple_ptr\n-\t  || targetm.expand_builtin_va_start != NULL\n-\t  || !builtin_decl_explicit_p (BUILT_IN_NEXT_ARG))\n-\treturn false;\n-\n-      if (gimple_call_num_args (call) != 2)\n-\treturn false;\n-\n-      lhs = gimple_call_arg (call, 0);\n-      if (!POINTER_TYPE_P (TREE_TYPE (lhs))\n-\t  || TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (lhs)))\n-\t     != TYPE_MAIN_VARIANT (cfun_va_list))\n-\treturn false;\n-      /* Create `tlhs = __builtin_next_arg(0);`. */\n-      tlhs = make_ssa_name (cfun_va_list);\n-      nstmt0 = gimple_build_call (builtin_decl_explicit (BUILT_IN_NEXT_ARG), 1, integer_zero_node);\n-      lhs = fold_build2 (MEM_REF, cfun_va_list, lhs, build_zero_cst (TREE_TYPE (lhs)));\n-      gimple_call_set_lhs (nstmt0, tlhs);\n-      gimple_set_location (nstmt0, loc);\n-      gimple_move_vops (nstmt0, call);\n-      gsi_replace (gsi, nstmt0, false);\n-      oldvdef = gimple_vdef (nstmt0);\n-      newvdef = make_ssa_name (gimple_vop (cfun), nstmt0);\n-      gimple_set_vdef (nstmt0, newvdef);\n-\n-      /* Create `*lhs = tlhs;`.  */\n-      nstmt = gimple_build_assign (lhs, tlhs);\n-      gimple_set_location (nstmt, loc);\n-      gimple_set_vuse (nstmt, newvdef);\n-      gimple_set_vdef (nstmt, oldvdef);\n-      SSA_NAME_DEF_STMT (oldvdef) = nstmt;\n-      gsi_insert_after (gsi, nstmt, GSI_NEW_STMT);\n-\n-      if (dump_file && (dump_flags & TDF_DETAILS))\n-\t{\n-\t  fprintf (dump_file, \"Simplified\\n  \");\n-\t  print_gimple_stmt (dump_file, call, 0, dump_flags);\n-\t  fprintf (dump_file, \"into\\n  \");\n-\t  print_gimple_stmt (dump_file, nstmt0, 0, dump_flags);\n-\t  fprintf (dump_file, \"  \");\n-\t  print_gimple_stmt (dump_file, nstmt, 0, dump_flags);\n-\t}\n-      return true;\n-\n-    case BUILT_IN_VA_COPY:\n-      if (!va_list_simple_ptr)\n-\treturn false;\n-\n-      if (gimple_call_num_args (call) != 2)\n-\treturn false;\n-\n-      lhs = gimple_call_arg (call, 0);\n-      if (!POINTER_TYPE_P (TREE_TYPE (lhs))\n-\t  || TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (lhs)))\n-\t     != TYPE_MAIN_VARIANT (cfun_va_list))\n-\treturn false;\n-      rhs = gimple_call_arg (call, 1);\n-      if (TYPE_MAIN_VARIANT (TREE_TYPE (rhs))\n-\t  != TYPE_MAIN_VARIANT (cfun_va_list))\n-\treturn false;\n-\n-      lhs = fold_build2 (MEM_REF, cfun_va_list, lhs, build_zero_cst (TREE_TYPE (lhs)));\n-      nstmt = gimple_build_assign (lhs, rhs);\n-      gimple_set_location (nstmt, loc);\n-      gimple_move_vops (nstmt, call);\n-      gsi_replace (gsi, nstmt, false);\n-\n-      if (dump_file && (dump_flags & TDF_DETAILS))\n-\t{\n-\t  fprintf (dump_file, \"Simplified\\n  \");\n-\t  print_gimple_stmt (dump_file, call, 0, dump_flags);\n-\t  fprintf (dump_file, \"into\\n  \");\n-\t  print_gimple_stmt (dump_file, nstmt, 0, dump_flags);\n-\t}\n-      return true;\n-\n-    case BUILT_IN_VA_END:\n-      /* No effect, so the statement will be deleted.  */\n-      if (dump_file && (dump_flags & TDF_DETAILS))\n-\t{\n-\t  fprintf (dump_file, \"Removed\\n  \");\n-\t  print_gimple_stmt (dump_file, call, 0, dump_flags);\n-\t}\n-      unlink_stmt_vdef (call);\n-      release_defs (call);\n-      gsi_replace (gsi, gimple_build_nop (), true);\n-      return true;\n-\n-    default:\n-      gcc_unreachable ();\n-    }\n-}\n-\n-\n /* Convert\n    _1 = __atomic_fetch_or_* (ptr_6, 1, _3);\n    _7 = ~_1;\n@@ -4339,14 +4221,6 @@ pass_fold_builtins::execute (function *fun)\n \t\t\t\t\t\t  false);\n \t\t  break;\n \n-\t\tcase BUILT_IN_VA_START:\n-\t\tcase BUILT_IN_VA_END:\n-\t\tcase BUILT_IN_VA_COPY:\n-\t\t  /* These shouldn't be folded before pass_stdarg.  */\n-\t\t  if (optimize_stdarg_builtin (&i, stmt))\n-\t\t    todoflags |= TODO_update_address_taken;\n-\t\t  break;\n-\n \t\tdefault:;\n \t\t}\n \ndiff --git a/gcc/tree-ssa-forwprop.cc b/gcc/tree-ssa-forwprop.cc\nindex c7ac96a28aa0..f72aac219805 100644\n--- a/gcc/tree-ssa-forwprop.cc\n+++ b/gcc/tree-ssa-forwprop.cc\n@@ -5464,6 +5464,11 @@ pass_forwprop::execute (function *fun)\n \t      if (fold_stmt (&gsi, fwprop_ssa_val, simple_dce_worklist))\n \t\t{\n \t\t  changed = true;\n+\t\t  /* There is no updating of the address\n+\t\t     taken after the last forwprop so update\n+\t\t     the addresses when a folding happened. */\n+\t\t  if (last_p)\n+\t\t    todoflags |= TODO_update_address_taken;\n \t\t  stmt = gsi_stmt (gsi);\n \t\t  /* Cleanup the CFG if we simplified a condition to\n \t\t     true or false.  */\n",
    "prefixes": [
        "v1",
        "07/10"
    ]
}