[{"id":3684488,"web_url":"http://patchwork.ozlabs.org/comment/3684488/","msgid":"","list_archive_url":null,"date":"2026-04-30T07:07:33","subject":"Re: [PATCH v2] 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":"On Wed, Apr 29, 2026 at 5:39 PM Michiel Derhaeg\n wrote:\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\nOK.\n\nThanks,\nRichard.\n\n> gcc/ChangeLog:\n>\n> * doc/params.texi: Added --param=max-niter-dominators-walk.\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> v2: Updated params.texi.\n>\n> gcc/doc/params.texi | 5 +++++\n> gcc/params.opt | 4 ++++\n> gcc/tree-ssa-loop-niter.cc | 14 ++++++--------\n> 3 files changed, 15 insertions(+), 8 deletions(-)\n>\n> diff --git a/gcc/doc/params.texi b/gcc/doc/params.texi\n> index 31b04688cf7..e6c89607e0d 100644\n> --- a/gcc/doc/params.texi\n> +++ b/gcc/doc/params.texi\n> @@ -889,6 +889,11 @@ protection when @option{-fstack-protector} is used.\n> The minimum size of variables taking part in stack slot sharing when not\n> optimizing.\n>\n> +@paindex max-niter-dominators-walk\n> +@item max-niter-dominators-walk\n> +Maximum number of dominators BBs to walk when simplifying loop bounds\n> +and conditions.\n> +\n> @paindex max-jump-thread-duplication-stmts\n> @item max-jump-thread-duplication-stmts\n> Maximum number of statements allowed in a block that needs to be\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 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","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3684491,"web_url":"http://patchwork.ozlabs.org/comment/3684491/","msgid":"","list_archive_url":null,"date":"2026-04-30T07:13:48","subject":"Re: [PATCH v2] niter: Make MAX_DOMINATORS_TO_WALK configurable at\n runtime","submitter":{"id":93030,"url":"http://patchwork.ozlabs.org/api/people/93030/","name":"Michiel Derhaeg","email":"Michiel.Derhaeg@synopsys.com"},"content":"Can someone push this to trunk for me?\n\nThanks!\nMichiel","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=synopsys.com header.i=@synopsys.com header.a=rsa-sha256\n header.s=pfptdkimsnps header.b=ZZ3azqRw;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=synopsys.com header.i=@synopsys.com 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changelog part\n\n>\n> Thanks!\n> Michiel","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=HM1THXGh;\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=HM1THXGh","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 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