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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113210] [14 Regression] ICE: tree check: expected integer_cst, have cond_expr in get_len, at tree.h:6481
Date: Mon, 08 Jan 2024 10:25:08 +0000 [thread overview]
Message-ID: <bug-113210-4-RqBFaUijLk@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-113210-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113210
--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #13)
> (In reply to Richard Biener from comment #12)
> > (In reply to Jakub Jelinek from comment #11)
> > > (In reply to Richard Biener from comment #9)
> > > > That is, another fix might be to adjust NITERSM1 to NITERS - 1 when
> > > > NITERS went constant ... (btw, I want to get rid of _NITERS and only
> > >
> > > Or we could only use fold_build2 for the PLUS_EXPR 1 computation if NITERSM1
> > > is INTEGER_CST, otherwise use build2...
> >
> > I think we should see where the original expression is built but not folded.
>
> Hmm, probably in estimate_numbers_of_iterations,
>
> if (TREE_CODE (niter_desc.may_be_zero) != INTEGER_CST)
> niter = build3 (COND_EXPR, type, niter_desc.may_be_zero,
> build_int_cst (type, 0),
> niter);
>
> I vaguely remember code trying to pattern match the COND_EXPR created
> by this (though it should instead use number_of_iterations_exit). It
> should be safe to replace the above with fold_build3.
No, it's not that. The COND_EXPR is folded, but we see
(short unsigned int) (a.0_1 + 255) + 1 > 256 ? ~(short unsigned int) (a.0_1 +
255) : 0
and that isn't catched.
#0 0x00000000014d3464 in fold_build3_loc (loc=0, code=COND_EXPR,
type=<integer_type 0x7ffff704b540 short unsigned int>,
op0=<gt_expr 0x7ffff7207f50>, op1=<bit_not_expr 0x7ffff6e13540>,
op2=<integer_cst 0x7ffff7047378>)
at /space/rguenther/src/gcc/gcc/fold-const.cc:14174
#1 0x00000000014d0513 in fold_ternary_loc (loc=0, code=COND_EXPR,
type=<integer_type 0x7ffff704b540 short unsigned int>,
op0=<le_expr 0x7ffff7207f00>, op1=<integer_cst 0x7ffff7047378>,
op2=<bit_not_expr 0x7ffff6e13540>)
at /space/rguenther/src/gcc/gcc/fold-const.cc:13238
#2 0x00000000014d3436 in fold_build3_loc (loc=0, code=COND_EXPR,
type=<integer_type 0x7ffff704b540 short unsigned int>,
op0=<le_expr 0x7ffff7207f00>, op1=<integer_cst 0x7ffff7047378>,
op2=<bit_not_expr 0x7ffff6e13540>)
at /space/rguenther/src/gcc/gcc/fold-const.cc:14172
#3 0x0000000001d4de50 in vect_get_loop_niters (loop=0x7ffff71e3600,
main_exit=0x7ffff7203990, assumptions=0x7fffffffd200,
number_of_iterations=0x7fffffffd1f0, number_of_iterationsm1=0x7fffffffd1f8)
at /space/rguenther/src/gcc/gcc/tree-vect-loop.cc:919
So I suggest to either try fixing that or, when adding one folds to a constant
make sure M1 is constant as well.
next prev parent reply other threads:[~2024-01-08 10:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-02 23:33 [Bug target/113210] New: [14] RISC-V vector " patrick at rivosinc dot com
2024-01-02 23:38 ` [Bug target/113210] " juzhe.zhong at rivai dot ai
2024-01-02 23:48 ` patrick at rivosinc dot com
2024-01-03 1:33 ` [Bug tree-optimization/113210] [14 Regression] " pinskia at gcc dot gnu.org
2024-01-03 1:34 ` pinskia at gcc dot gnu.org
2024-01-03 1:39 ` pinskia at gcc dot gnu.org
2024-01-03 1:42 ` pinskia at gcc dot gnu.org
2024-01-05 14:37 ` jakub at gcc dot gnu.org
2024-01-05 16:09 ` jakub at gcc dot gnu.org
2024-01-05 16:21 ` jakub at gcc dot gnu.org
2024-01-08 9:44 ` rguenth at gcc dot gnu.org
2024-01-08 10:02 ` jakub at gcc dot gnu.org
2024-01-08 10:09 ` jakub at gcc dot gnu.org
2024-01-08 10:16 ` rguenth at gcc dot gnu.org
2024-01-08 10:18 ` rguenth at gcc dot gnu.org
2024-01-08 10:25 ` rguenth at gcc dot gnu.org [this message]
2024-01-08 15:58 ` jakub at gcc dot gnu.org
2024-01-09 8:36 ` rguenth at gcc dot gnu.org
2024-01-09 9:32 ` cvs-commit at gcc dot gnu.org
2024-01-09 9:32 ` jakub at gcc dot gnu.org
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