[{"id":3678303,"web_url":"http://patchwork.ozlabs.org/comment/3678303/","msgid":"","list_archive_url":null,"date":"2026-04-16T18:08:49","subject":"Re: [GCC17-PATCH] cfghooks: Pass data to callback function of\n make_forwarder_block","submitter":{"id":1765,"url":"http://patchwork.ozlabs.org/api/people/1765/","name":"Richard Biener","email":"richard.guenther@gmail.com"},"content":"On Thu, Apr 16, 2026 at 4:39 AM Andrew Pinski\n wrote:\n>\n> This makes a cleanup that is way overdue and should have been done\n> years ago. Instead of setting some global/static variables for the\n> callback function to check here, we pass down the data to the callback\n> function. This reduces the number of global variables (which should help\n> with Parallel GCC project). Plus since mfb_keep_just was exported outside\n> of cfgloopmanip.cc (it was used in tree-ssa-threadupdate.cc), it reduces\n> is shared between files.\n>\n> I found this useful when working on PR 123113 as I needed a new callback\n> function.\n>\n> Bootstrapped and tested on x86_64-linux-gnu.\n\nOK for stage1.\n\nRichard.\n\n> gcc/ChangeLog:\n>\n> * cfghooks.cc (make_forwarder_block): New data argument,\n> pass it down to redirect_edge_p.\n> * cfghooks.h (make_forwarder_block): Add void* argument.\n> * cfgloop.cc (mfb_reis_set): Remove.\n> (mfb_redirect_edges_in_set): Add new data argument.\n> Use it instead of mfb_reis_set.\n> (form_subloop): Create a local variable instead of\n> mfb_areis_set. Update call to make_forwarder_block.\n> (merge_latch_edges): Likewise.\n> * cfgloopmanip.cc (mfb_kj_edge): Remove.\n> (mfb_keep_just): Add new data argument.\n> Use it instead of mfb_kj_edge.\n> (create_preheader): Use local variable instead of\n> mfb_kj_edge. Update call to make_forwarder_block.\n> * cfgloopmanip.h (mfb_keep_just): Add void* argument.\n> * tree-cfgcleanup.cc (mfb_keep_latches): Add unused void* arugment.\n> (cleanup_tree_cfg_noloop): Update call to make_forwarder_block.\n> * tree-ssa-threadupdate.cc\n> (fwd_jt_path_registry::thread_through_loop_header): Use local\n> variable instead of mfb_kj_edge. Update call to make_forwarder_block.\n>\n> Signed-off-by: Andrew Pinski \n> ---\n> gcc/cfghooks.cc | 7 ++++---\n> gcc/cfghooks.h | 2 +-\n> gcc/cfgloop.cc | 24 ++++++++++++------------\n> gcc/cfgloopmanip.cc | 15 ++++++++-------\n> gcc/cfgloopmanip.h | 4 +---\n> gcc/tree-cfgcleanup.cc | 7 +++++--\n> gcc/tree-ssa-threadupdate.cc | 7 ++++---\n> 7 files changed, 35 insertions(+), 31 deletions(-)\n>\n> diff --git a/gcc/cfghooks.cc b/gcc/cfghooks.cc\n> index 063639fe1c9..6415d0fdec2 100644\n> --- a/gcc/cfghooks.cc\n> +++ b/gcc/cfghooks.cc\n> @@ -923,10 +923,11 @@ merge_blocks (basic_block a, basic_block b)\n>\n> /* Split BB into entry part and the rest (the rest is the newly created block).\n> Redirect those edges for that REDIRECT_EDGE_P returns true to the entry\n> - part. Returns the edge connecting the entry part to the rest. */\n> + part. Returns the edge connecting the entry part to the rest.\n> + DATA gets passed on to REDIRECT_EDGE_P. */\n>\n> edge\n> -make_forwarder_block (basic_block bb, bool (*redirect_edge_p) (edge))\n> +make_forwarder_block (basic_block bb, bool (*redirect_edge_p) (edge, void*), void *data)\n> {\n> edge e, fallthru;\n> edge_iterator ei;\n> @@ -947,7 +948,7 @@ make_forwarder_block (basic_block bb, bool (*redirect_edge_p) (edge))\n> {\n> basic_block e_src;\n>\n> - if (redirect_edge_p (e))\n> + if (redirect_edge_p (e, data))\n> {\n> dummy->count += e->count ();\n> ei_next (&ei);\n> diff --git a/gcc/cfghooks.h b/gcc/cfghooks.h\n> index 6cc1b66baef..bc7956be2a8 100644\n> --- a/gcc/cfghooks.h\n> +++ b/gcc/cfghooks.h\n> @@ -245,7 +245,7 @@ extern basic_block create_basic_block (gimple_seq, basic_block);\n> extern basic_block create_empty_bb (basic_block);\n> extern bool can_merge_blocks_p (basic_block, basic_block);\n> extern void merge_blocks (basic_block, basic_block);\n> -extern edge make_forwarder_block (basic_block, bool (*)(edge));\n> +extern edge make_forwarder_block (basic_block, bool (*)(edge, void*), void*);\n> extern basic_block force_nonfallthru (edge);\n> extern void tidy_fallthru_edge (edge);\n> extern void tidy_fallthru_edges (void);\n> diff --git a/gcc/cfgloop.cc b/gcc/cfgloop.cc\n> index fc4d635d8b6..70f2996a416 100644\n> --- a/gcc/cfgloop.cc\n> +++ b/gcc/cfgloop.cc\n> @@ -709,13 +709,13 @@ find_subloop_latch_edge (class loop *loop)\n> }\n>\n> /* Callback for make_forwarder_block. Returns true if the edge E is marked\n> - in the set MFB_REIS_SET. */\n> + in the set SET(DATA). */\n>\n> -static hash_set *mfb_reis_set;\n> static bool\n> -mfb_redirect_edges_in_set (edge e)\n> +mfb_redirect_edges_in_set (edge e, void *data)\n> {\n> - return mfb_reis_set->contains (e);\n> + hash_set *set = (hash_set *)data;\n> + return set->contains (e);\n> }\n>\n> /* Creates a subloop of LOOP with latch edge LATCH. */\n> @@ -727,14 +727,14 @@ form_subloop (class loop *loop, edge latch)\n> edge e, new_entry;\n> class loop *new_loop;\n>\n> - mfb_reis_set = new hash_set;\n> + hash_set *reis_set = new hash_set;\n> FOR_EACH_EDGE (e, ei, loop->header->preds)\n> {\n> if (e != latch)\n> - mfb_reis_set->add (e);\n> + reis_set->add (e);\n> }\n> - new_entry = make_forwarder_block (loop->header, mfb_redirect_edges_in_set);\n> - delete mfb_reis_set;\n> + new_entry = make_forwarder_block (loop->header, mfb_redirect_edges_in_set, reis_set);\n> + delete reis_set;\n>\n> loop->header = new_entry->src;\n>\n> @@ -765,11 +765,11 @@ merge_latch_edges (class loop *loop)\n> if (dump_file)\n> fprintf (dump_file, \"Merged latch edges of loop %d\\n\", loop->num);\n>\n> - mfb_reis_set = new hash_set;\n> + hash_set *reis_set = new hash_set;\n> FOR_EACH_VEC_ELT (latches, i, e)\n> - mfb_reis_set->add (e);\n> - latch = make_forwarder_block (loop->header, mfb_redirect_edges_in_set);\n> - delete mfb_reis_set;\n> + reis_set->add (e);\n> + latch = make_forwarder_block (loop->header, mfb_redirect_edges_in_set, reis_set);\n> + delete reis_set;\n>\n> loop->header = latch->dest;\n> loop->latch = latch->src;\n> diff --git a/gcc/cfgloopmanip.cc b/gcc/cfgloopmanip.cc\n> index c953bc95b40..dd5ae82f73e 100644\n> --- a/gcc/cfgloopmanip.cc\n> +++ b/gcc/cfgloopmanip.cc\n> @@ -1640,14 +1640,14 @@ duplicate_loop_body_to_header_edge (class loop *loop, edge e,\n> }\n>\n> /* A callback for make_forwarder block, to redirect all edges except for\n> - MFB_KJ_EDGE to the entry part. E is the edge for that we should decide\n> + OTHER(DATA) to the entry part. E is the edge for that we should decide\n> whether to redirect it. */\n>\n> -edge mfb_kj_edge;\n> bool\n> -mfb_keep_just (edge e)\n> +mfb_keep_just (edge e, void *data)\n> {\n> - return e != mfb_kj_edge;\n> + edge other = (edge)data;\n> + return e != other;\n> }\n>\n> /* True when a candidate preheader BLOCK has predecessors from LOOP. */\n> @@ -1729,15 +1729,16 @@ create_preheader (class loop *loop, int flags)\n> return NULL;\n> }\n>\n> - mfb_kj_edge = loop_latch_edge (loop);\n> - latch_edge_was_fallthru = (mfb_kj_edge->flags & EDGE_FALLTHRU) != 0;\n> + edge latch;\n> + latch = loop_latch_edge (loop);\n> + latch_edge_was_fallthru = (latch->flags & EDGE_FALLTHRU) != 0;\n> if (nentry == 1\n> && ((flags & CP_FALLTHRU_PREHEADERS) == 0\n> || (single_entry->flags & EDGE_CROSSING) == 0))\n> dummy = split_edge (single_entry);\n> else\n> {\n> - edge fallthru = make_forwarder_block (loop->header, mfb_keep_just);\n> + edge fallthru = make_forwarder_block (loop->header, mfb_keep_just, latch);\n> dummy = fallthru->src;\n> loop->header = fallthru->dest;\n> }\n> diff --git a/gcc/cfgloopmanip.h b/gcc/cfgloopmanip.h\n> index 396e6d69e8c..106cc7d005a 100644\n> --- a/gcc/cfgloopmanip.h\n> +++ b/gcc/cfgloopmanip.h\n> @@ -38,8 +38,6 @@ enum\n> discriminators to\n> distinguish loop\n> iterations. */\n> -extern edge mfb_kj_edge;\n> -\n> extern bool remove_path (edge, bool * = NULL, bitmap = NULL);\n> extern void place_new_loop (struct function *, class loop *);\n> extern void add_loop (class loop *, class loop *);\n> @@ -62,7 +60,7 @@ extern bool can_duplicate_loop_p (const class loop *loop);\n> extern bool\n> duplicate_loop_body_to_header_edge (class loop *, edge, unsigned, sbitmap, edge,\n> vec *, int);\n> -extern bool mfb_keep_just (edge);\n> +extern bool mfb_keep_just (edge, void *);\n> basic_block create_preheader (class loop *, int);\n> extern void create_preheaders (int);\n> extern void force_single_succ_latches (void);\n> diff --git a/gcc/tree-cfgcleanup.cc b/gcc/tree-cfgcleanup.cc\n> index ab3c8c30893..234b45a219f 100644\n> --- a/gcc/tree-cfgcleanup.cc\n> +++ b/gcc/tree-cfgcleanup.cc\n> @@ -1103,8 +1103,11 @@ cleanup_control_flow_pre ()\n> return retval;\n> }\n>\n> +/* Callback function for make_forwarder_block which returns\n> + true when E is not a latch. */\n> +\n> static bool\n> -mfb_keep_latches (edge e)\n> +mfb_keep_latches (edge e, void*)\n> {\n> return !((dom_info_available_p (CDI_DOMINATORS)\n> && dominated_by_p (CDI_DOMINATORS, e->src, e->dest))\n> @@ -1164,7 +1167,7 @@ cleanup_tree_cfg_noloop (unsigned ssa_update_flags)\n> create a forwarder. */\n> if (found_latch && ! any_abnormal && n > 1)\n> {\n> - edge fallthru = make_forwarder_block (bb, mfb_keep_latches);\n> + edge fallthru = make_forwarder_block (bb, mfb_keep_latches, NULL);\n> loop->header = fallthru->dest;\n> if (! loops_state_satisfies_p (LOOPS_NEED_FIXUP))\n> {\n> diff --git a/gcc/tree-ssa-threadupdate.cc b/gcc/tree-ssa-threadupdate.cc\n> index 0e437b14551..db3520b42fc 100644\n> --- a/gcc/tree-ssa-threadupdate.cc\n> +++ b/gcc/tree-ssa-threadupdate.cc\n> @@ -1867,9 +1867,10 @@ fwd_jt_path_registry::thread_through_loop_header (class loop *loop,\n> must have only a single successor, but the original header had at\n> least two successors. */\n> loop->latch = NULL;\n> - mfb_kj_edge = single_succ_edge (new_preheader);\n> - loop->header = mfb_kj_edge->dest;\n> - latch = make_forwarder_block (tgt_bb, mfb_keep_just);\n> + edge keep_edge;\n> + keep_edge = single_succ_edge (new_preheader);\n> + loop->header = keep_edge->dest;\n> + latch = make_forwarder_block (tgt_bb, mfb_keep_just, keep_edge);\n> loop->header = latch->dest;\n> loop->latch = latch->src;\n> return true;\n> --\n> 2.43.0\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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=njFhnvRn;\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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Thu, 16 Apr 2026\n 11:09:01 -0700 (PDT)","MIME-Version":"1.0","References":"<20260416023829.940969-1-andrew.pinski@oss.qualcomm.com>","In-Reply-To":"<20260416023829.940969-1-andrew.pinski@oss.qualcomm.com>","From":"Richard Biener ","Date":"Thu, 16 Apr 2026 20:08:49 +0200","X-Gm-Features":"AQROBzBLtzmMVYYEG6or7DoShDum7quUl0TxVtuXL0y3l3yRRgR5cY760q9_iy8","Message-ID":"\n ","Subject":"Re: [GCC17-PATCH] cfghooks: Pass data to callback function of\n make_forwarder_block","To":"Andrew Pinski ","Cc":"gcc-patches@gcc.gnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","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"}}]