{"id":2229453,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229453/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/20260428091201.E57184BB5899@sourceware.org/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/projects/17/?format=json","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},"msgid":"<20260428091201.E57184BB5899@sourceware.org>","date":"2026-04-28T09:11:25","name":"[4/4] Add comment to vect_estimate_min_profitable_iters","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"c836213d6f55868934e065cd450ed158bfb6c107","submitter":{"id":4338,"url":"http://patchwork.ozlabs.org/api/1.1/people/4338/?format=json","name":"Richard Biener","email":"rguenther@suse.de"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/20260428091201.E57184BB5899@sourceware.org/mbox/","series":[{"id":501803,"url":"http://patchwork.ozlabs.org/api/1.1/series/501803/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=501803","date":"2026-04-28T09:11:06","name":"[1/4] Simplify vect_get_known_peeling_cost","version":1,"mbox":"http://patchwork.ozlabs.org/series/501803/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229453/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229453/checks/","tags":{},"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 (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=akBtl+2q;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=oAucTNqr;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=akBtl+2q;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=oAucTNqr;\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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charset=US-ASCII","X-Spamd-Result":"default: False [-1.80 / 50.00]; BAYES_HAM(-3.00)[100.00%];\n MISSING_MID(2.50)[]; NEURAL_HAM_LONG(-1.00)[-0.998];\n NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain];\n FUZZY_RATELIMITED(0.00)[rspamd.com]; ARC_NA(0.00)[];\n RCPT_COUNT_ONE(0.00)[1];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[];\n RCVD_COUNT_ZERO(0.00)[0]; MISSING_XM_UA(0.00)[];\n FROM_EQ_ENVFROM(0.00)[]; TO_DN_NONE(0.00)[];\n MIME_TRACE(0.00)[0:+]","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","Message-Id":"<20260428091201.E57184BB5899@sourceware.org>"},"content":"The following adds a comment how it's awkward to add the scalar loop\nstmt cost vectors with scaled count to the vector loop cost vector\nto estimate peeling costs.\n\nBootstrapped and tested on x86_64-unknown-linux-gnu, pushed.\n\n\t* tree-vect-loop.cc (vect_estimate_min_profitable_iters):\n\tAdd comment about costing of prologue/epilogue.\n---\n gcc/tree-vect-loop.cc | 5 +++++\n 1 file changed, 5 insertions(+)","diff":"diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc\nindex 94f3d00d60e..ee540028ba9 100644\n--- a/gcc/tree-vect-loop.cc\n+++ b/gcc/tree-vect-loop.cc\n@@ -4130,6 +4130,11 @@ vect_estimate_min_profitable_iters (loop_vec_info loop_vinfo,\n \tepilogue_need_br_taken_cost = true;\n }\n \n+ /* The way we cummulate peeling costs into the vector prologue/epilogue\n+ cost is a bit awkward given we cannot reuse scalar_costs which is\n+ already computed and also because it cannot take into account any\n+ epilogue vectorization we'll carry out in the end. */\n+\n stmt_info_for_cost *si;\n int j;\n /* Add costs associated with peel_iters_prologue. */\n","prefixes":["4/4"]}