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From: "guojiufu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/102087] [12 Regression] ICE on valid code at -O3 on x86_64-linux-gnu: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049 since r12-3136-g3673dcf6d6baeb67 Date: Fri, 27 Aug 2021 13:27:38 +0000 [thread overview] Message-ID: <bug-102087-4-mA6uir4sAM@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-102087-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102087 --- Comment #6 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> --- Drafting patch to calculate three items: control, bound and cmp. ---- diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 7af92d1c893..c6e4b24fd83 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -1482,7 +1482,7 @@ number_of_iterations_until_wrap (class loop *, tree type, affine_iv *iv0, affine_iv *iv1, class tree_niter_desc *niter) { tree niter_type = unsigned_type_for (type); - tree step, num, assumptions, may_be_zero; + tree step, num, assumptions, may_be_zero, span; wide_int high, low, max, min; may_be_zero = fold_build2 (LE_EXPR, boolean_type_node, iv1->base, iv0->base); @@ -1513,6 +1513,8 @@ number_of_iterations_until_wrap (class loop *, tree type, affine_iv *iv0, low = wi::to_wide (iv0->base); else low = min; + + niter->control = *iv1; } /* {base, -C} < n. */ else if (tree_int_cst_sign_bit (iv0->step) && integer_zerop (iv1->step)) @@ -1533,6 +1535,8 @@ number_of_iterations_until_wrap (class loop *, tree type, affine_iv *iv0, high = wi::to_wide (iv1->base); else high = max; + + niter->control = *iv0; } else return false; @@ -1556,6 +1560,14 @@ number_of_iterations_until_wrap (class loop *, tree type, affine_iv *iv0, niter->assumptions, assumptions); niter->control.no_overflow = false; + tree niter_m1 = fold_build2 (MINUS_EXPR, niter_type, niter->niter, + build_int_cst (niter_type, 1)); + span = fold_build2 (MULT_EXPR, niter_type, niter_m1, + fold_convert (niter_type, niter->control.step)); + niter->bound = fold_build2 (PLUS_EXPR, niter_type, span, + fold_convert (niter_type, niter->control.base)); + niter->bound = fold_convert (type, niter->bound); + niter->cmp = NE_EXPR; return true; } ------------------------ While this code may generate complicated niter->bound if the step is not +-1.
next prev parent reply other threads:[~2021-08-27 13:27 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-26 20:35 [Bug tree-optimization/102087] New: ICE on valid code at -O3 on x86_64-linux-gnu: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049 zhendong.su at inf dot ethz.ch 2021-08-27 7:05 ` [Bug tree-optimization/102087] [12 Regression] " rguenth at gcc dot gnu.org 2021-08-27 7:55 ` [Bug tree-optimization/102087] [12 Regression] ICE on valid code at -O3 on x86_64-linux-gnu: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049 since r12-3136-g3673dcf6d6baeb67 marxin at gcc dot gnu.org 2021-08-27 7:55 ` marxin at gcc dot gnu.org 2021-08-27 10:04 ` guojiufu at gcc dot gnu.org 2021-08-27 12:52 ` hjl.tools at gmail dot com 2021-08-27 12:53 ` hjl.tools at gmail dot com 2021-08-27 13:27 ` guojiufu at gcc dot gnu.org [this message] 2021-08-27 14:08 ` guojiufu at gcc dot gnu.org 2021-08-28 20:32 ` dcb314 at hotmail dot com 2021-08-28 20:41 ` dcb314 at hotmail dot com 2021-08-30 3:26 ` guojiufu at gcc dot gnu.org 2021-09-02 9:22 ` pinskia at gcc dot gnu.org 2021-09-22 13:03 ` cvs-commit at gcc dot gnu.org 2021-09-24 7:58 ` dcb314 at hotmail dot com 2021-09-24 12:15 ` rguenth at gcc dot gnu.org 2021-09-24 17:47 ` dcb314 at hotmail dot com 2021-10-09 5:51 ` guojiufu at gcc dot gnu.org 2021-12-06 15:42 ` asolokha at gmx dot com 2021-12-06 17:43 ` dcb314 at hotmail dot com 2021-12-16 1:47 ` guojiufu at gcc dot gnu.org 2022-01-18 9:27 ` dcb314 at hotmail dot com 2022-01-18 9:37 ` marxin at gcc dot gnu.org 2022-01-19 9:32 ` guojiufu at gcc dot gnu.org 2022-01-24 9:07 ` cvs-commit at gcc dot gnu.org 2022-02-15 12:58 ` rguenth at gcc dot gnu.org
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