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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/112380] [14 regression] ICE when building Mesa
 (in combine, internal compiler error: in simplify_subreg) since
 r14-4612-g6decda1a35be57
Date: Sat, 04 Nov 2023 19:40:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112380

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-11-04
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #7)
> That almost definitely just exposed the issue. Let me see if I can get a
> testcase that fails without depending on that.

New testcase which seems to have the same IR going into expand for GCC 13.2=
.0
and the trunk:
```
struct ureg_src {
  unsigned File : 4;
  unsigned : 2;
  unsigned : 2;
  unsigned : 2;
  unsigned : 1;
  unsigned IndirectFile : 4;
  unsigned IndirectSwizzle : 2;
  int : 16;
  int : 6;
  int : 16;
  int : 16;
  unsigned : 10;
} __trans_tmp_1;

int hh, nn;

void ureg_scalar(struct ureg_src);

void ntt_emit_texture_instr() {
  struct ureg_src sampler;
  unsigned char *t =3D ((char*)&sampler);
  unsigned char t1;
  unsigned t2, t3;
  if (nn) {
    sampler =3D __trans_tmp_1;
    t1 =3D *t;
    t2 =3D sampler.IndirectFile;
    t3 =3D sampler.IndirectSwizzle;
  }
  struct ureg_src reg =3D sampler;
  *t =3D t1;
  ureg_scalar(reg);
}
```=