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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109137] [12/13 regression] Compiling ffmpeg with -m32 on
 x86_64-pc-linux-gnu hangs on libavcodec/h264_cabac.c since
 r12-9086-g489c81db7d4f75
Date: Thu, 16 Mar 2023 10:41:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109137

--- Comment #13 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 16 Mar 2023, jakub at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109137
>=20
> --- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Ah, but
> 1690      if (flag_checking
> 1691          && (lra_assignment_iter_after_spill
> 1692              > LRA_MAX_ASSIGNMENT_ITERATION_NUMBER))
> 1693        internal_error
> 1694          ("maximum number of LRA assignment passes is achieved (%d)",
> 1695           LRA_MAX_ASSIGNMENT_ITERATION_NUMBER);
> is guarded with -fchecking.  So it really hangs with -fno-checking.
> Now, on the
> error: =E2=80=98asm=E2=80=99 operand has impossible constraints
> errors the problematic insns are removed:
> 1864                  PATTERN (insn) =3D gen_rtx_USE (VOIDmode, const0_rt=
x);
> 1865                  lra_set_insn_deleted (insn);
> or nulified in case of asm goto, so wonder whether some LRA state shouldn=
't be
> reset at that point as well or what is the reason for the > 30 iterations.

"easy" out would be to do flag_checking || error_count?=