[{"id":3684123,"web_url":"http://patchwork.ozlabs.org/comment/3684123/","msgid":"<92652B4D-A92C-4F65-AF69-80CB4943BEE6@gmail.com>","list_archive_url":null,"date":"2026-04-29T15:06:41","subject":"Re: [PATCH] niter: Make MAX_DOMINATORS_TO_WALK configurable at\n runtime","submitter":{"id":1765,"url":"http://patchwork.ozlabs.org/api/people/1765/","name":"Richard Biener","email":"richard.guenther@gmail.com"},"content":"> Am 29.04.2026 um 16:08 schrieb Michiel Derhaeg :\n> \n> MAX_DOMINATORS_TO_WALK can be too small for very large function bodies.\n> Made it an option such that we can increase the value when needed.\n\nParameters need to be doumented in invoke.texi\n\nOtherwise looks OK\n\nRichard \n> gcc/ChangeLog:\n> \n> * params.opt: Added --param=max-niter-dominators-walk.\n> * tree-ssa-loop-niter.cc (MAX_DOMINATORS_TO_WALK): Removed.\n> (determine_value_range): Updated.\n> (bound_difference): Updated.\n> (simplify_using_initial_conditions): Updated.\n> \n> Signed-off-by: Michiel Derhaeg \n> ---\n> gcc/params.opt | 4 ++++\n> gcc/tree-ssa-loop-niter.cc | 14 ++++++--------\n> 2 files changed, 10 insertions(+), 8 deletions(-)\n> \n> diff --git a/gcc/params.opt b/gcc/params.opt\n> index b35ca688cdf..9eeb1f3fa64 100644\n> --- a/gcc/params.opt\n> +++ b/gcc/params.opt\n> @@ -674,6 +674,10 @@ Bound on the cost of an expression to compute the number of iterations.\n> Common Joined UInteger Var(param_max_iterations_to_track) Init(1000) Param Optimization\n> Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates.\n> \n> +-param=max-niter-dominators-walk=\n> +Common Joined UInteger Var(param_max_niter_dominators_walk) Init(8) IntegerRange(1, 1024) Param Optimization\n> +Maximum number of dominators BBs to walk when simplifying loop bounds and conditions.\n> +\n> -param=max-jump-thread-duplication-stmts=\n> Common Joined UInteger Var(param_max_jump_thread_duplication_stmts) Init(15) Param Optimization\n> Maximum number of statements allowed in a block that needs to be duplicated when threading jumps.\n> diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc\n> index 00c4a9c81f8..c39401147ae 100644\n> --- a/gcc/tree-ssa-loop-niter.cc\n> +++ b/gcc/tree-ssa-loop-niter.cc\n> @@ -48,11 +48,6 @@ along with GCC; see the file COPYING3. If not see\n> #include \"sreal.h\"\n> \n> \n> -/* The maximum number of dominator BBs we search for conditions\n> - of loop header copies we use for simplifying a conditional\n> - expression. */\n> -#define MAX_DOMINATORS_TO_WALK 8\n> -\n> /*\n> \n> Analysis of number of iterations of an affine exit test.\n> @@ -441,7 +436,8 @@ determine_value_range (class loop *loop, tree type, tree var, mpz_t off,\n> /* Now walk the dominators of the loop header and use the entry\n> guards to refine the estimates. */\n> for (bb = loop->header;\n> - bb != ENTRY_BLOCK_PTR_FOR_FN (cfun) && cnt < MAX_DOMINATORS_TO_WALK;\n> + bb != ENTRY_BLOCK_PTR_FOR_FN (cfun)\n> + && cnt < param_max_niter_dominators_walk;\n> bb = get_immediate_dominator (CDI_DOMINATORS, bb))\n> {\n> edge e;\n> @@ -769,7 +765,8 @@ bound_difference (class loop *loop, tree x, tree y, bounds *bnds)\n> /* Now walk the dominators of the loop header and use the entry\n> guards to refine the estimates. */\n> for (bb = loop->header;\n> - bb != ENTRY_BLOCK_PTR_FOR_FN (cfun) && cnt < MAX_DOMINATORS_TO_WALK;\n> + bb != ENTRY_BLOCK_PTR_FOR_FN (cfun)\n> + && cnt < param_max_niter_dominators_walk;\n> bb = get_immediate_dominator (CDI_DOMINATORS, bb))\n> {\n> if (!single_pred_p (bb))\n> @@ -3100,7 +3097,8 @@ simplify_using_initial_conditions (class loop *loop, tree expr)\n> the number of BBs times the number of loops in degenerate\n> cases. */\n> for (bb = loop->header;\n> - bb != ENTRY_BLOCK_PTR_FOR_FN (cfun) && cnt < MAX_DOMINATORS_TO_WALK;\n> + bb != ENTRY_BLOCK_PTR_FOR_FN (cfun)\n> + && cnt < param_max_niter_dominators_walk;\n> bb = get_immediate_dominator (CDI_DOMINATORS, bb))\n> {\n> if (!single_pred_p (bb))\n> --\n> 2.37.1\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=Jm13Hl+x;\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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.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=Jm13Hl+x","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; spf=pass smtp.mailfrom=gmail.com","server2.sourceware.org;\n arc=none smtp.remote-ip=209.85.218.54"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5LJF4ZpDz1xqf\n\tfor ; Thu, 30 Apr 2026 01:07:25 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id A20CE4B99F50\n\tfor ; Wed, 29 Apr 2026 15:07:23 +0000 (GMT)","from mail-ej1-f54.google.com (mail-ej1-f54.google.com\n [209.85.218.54])\n by sourceware.org (Postfix) with ESMTPS id 930064BA23D1\n for ; Wed, 29 Apr 2026 15:06:56 +0000 (GMT)","by mail-ej1-f54.google.com with SMTP id\n a640c23a62f3a-ba922426c5cso1137761066b.3\n for ; Wed, 29 Apr 2026 08:06:56 -0700 (PDT)","from smtpclient.apple\n (dynamic-077-007-222-017.77.7.pool.telefonica.de. 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charset=utf-8","Content-Transfer-Encoding":"quoted-printable","From":"Richard Biener ","Mime-Version":"1.0 (1.0)","Subject":"Re: [PATCH] niter: Make MAX_DOMINATORS_TO_WALK configurable at\n runtime","Date":"Wed, 29 Apr 2026 17:06:41 +0200","Message-Id":"<92652B4D-A92C-4F65-AF69-80CB4943BEE6@gmail.com>","References":"<20260429140629.3051323-1-michiel@synopsys.com>","Cc":"gcc-patches@gcc.gnu.org","In-Reply-To":"<20260429140629.3051323-1-michiel@synopsys.com>","To":"Michiel Derhaeg ","X-Mailer":"iPhone Mail (23E261)","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":3684126,"web_url":"http://patchwork.ozlabs.org/comment/3684126/","msgid":"","list_archive_url":null,"date":"2026-04-29T15:09:40","subject":"Re: [PATCH] niter: Make MAX_DOMINATORS_TO_WALK configurable at\n runtime","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Wed, Apr 29, 2026 at 8:07 AM Richard Biener\n wrote:\n>\n>\n>\n> > Am 29.04.2026 um 16:08 schrieb Michiel Derhaeg :\n> >\n> > MAX_DOMINATORS_TO_WALK can be too small for very large function bodies.\n> > Made it an option such that we can increase the value when needed.\n>\n> Parameters need to be doumented in invoke.texi\n\nOr rather params.texi now.\n\nThanks,\nAndrew\n\n\n>\n> Otherwise looks OK\n>\n> Richard\n> > gcc/ChangeLog:\n> >\n> > * params.opt: Added --param=max-niter-dominators-walk.\n> > * tree-ssa-loop-niter.cc (MAX_DOMINATORS_TO_WALK): Removed.\n> > (determine_value_range): Updated.\n> > (bound_difference): Updated.\n> > (simplify_using_initial_conditions): Updated.\n> >\n> > Signed-off-by: Michiel Derhaeg \n> > ---\n> > gcc/params.opt | 4 ++++\n> > gcc/tree-ssa-loop-niter.cc | 14 ++++++--------\n> > 2 files changed, 10 insertions(+), 8 deletions(-)\n> >\n> > diff --git a/gcc/params.opt b/gcc/params.opt\n> > index b35ca688cdf..9eeb1f3fa64 100644\n> > --- a/gcc/params.opt\n> > +++ b/gcc/params.opt\n> > @@ -674,6 +674,10 @@ Bound on the cost of an expression to compute the number of iterations.\n> > Common Joined UInteger Var(param_max_iterations_to_track) Init(1000) Param Optimization\n> > Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates.\n> >\n> > +-param=max-niter-dominators-walk=\n> > +Common Joined UInteger Var(param_max_niter_dominators_walk) Init(8) IntegerRange(1, 1024) Param Optimization\n> > +Maximum number of dominators BBs to walk when simplifying loop bounds and conditions.\n> > +\n> > -param=max-jump-thread-duplication-stmts=\n> > Common Joined UInteger Var(param_max_jump_thread_duplication_stmts) Init(15) Param Optimization\n> > Maximum number of statements allowed in a block that needs to be duplicated when threading jumps.\n> > diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc\n> > index 00c4a9c81f8..c39401147ae 100644\n> > --- a/gcc/tree-ssa-loop-niter.cc\n> > +++ b/gcc/tree-ssa-loop-niter.cc\n> > @@ -48,11 +48,6 @@ along with GCC; see the file COPYING3. If not see\n> > #include \"sreal.h\"\n> >\n> >\n> > -/* The maximum number of dominator BBs we search for conditions\n> > - of loop header copies we use for simplifying a conditional\n> > - expression. */\n> > -#define MAX_DOMINATORS_TO_WALK 8\n> > -\n> > /*\n> >\n> > Analysis of number of iterations of an affine exit test.\n> > @@ -441,7 +436,8 @@ determine_value_range (class loop *loop, tree type, tree var, mpz_t off,\n> > /* Now walk the dominators of the loop header and use the entry\n> > guards to refine the estimates. */\n> > for (bb = loop->header;\n> > - bb != ENTRY_BLOCK_PTR_FOR_FN (cfun) && cnt < MAX_DOMINATORS_TO_WALK;\n> > + bb != ENTRY_BLOCK_PTR_FOR_FN (cfun)\n> > + && cnt < param_max_niter_dominators_walk;\n> > bb = get_immediate_dominator (CDI_DOMINATORS, bb))\n> > {\n> > edge e;\n> > @@ -769,7 +765,8 @@ bound_difference (class loop *loop, tree x, tree y, bounds *bnds)\n> > /* Now walk the dominators of the loop header and use the entry\n> > guards to refine the estimates. */\n> > for (bb = loop->header;\n> > - bb != ENTRY_BLOCK_PTR_FOR_FN (cfun) && cnt < MAX_DOMINATORS_TO_WALK;\n> > + bb != ENTRY_BLOCK_PTR_FOR_FN (cfun)\n> > + && cnt < param_max_niter_dominators_walk;\n> > bb = get_immediate_dominator (CDI_DOMINATORS, bb))\n> > {\n> > if (!single_pred_p (bb))\n> > @@ -3100,7 +3097,8 @@ simplify_using_initial_conditions (class loop *loop, tree expr)\n> > the number of BBs times the number of loops in degenerate\n> > cases. */\n> > for (bb = loop->header;\n> > - bb != ENTRY_BLOCK_PTR_FOR_FN (cfun) && cnt < MAX_DOMINATORS_TO_WALK;\n> > + bb != ENTRY_BLOCK_PTR_FOR_FN (cfun)\n> > + && cnt < param_max_niter_dominators_walk;\n> > bb = get_immediate_dominator (CDI_DOMINATORS, bb))\n> > {\n> > if (!single_pred_p (bb))\n> > --\n> > 2.37.1\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=N+Mlr1vZ;\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=NTb7IT0I;\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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