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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/97633] New: ICE at -O3: verify_gimple failed
Date: Thu, 29 Oct 2020 20:27:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97633

            Bug ID: 97633
           Summary: ICE at -O3: verify_gimple failed
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

[508] % gcctk -v
Using built-in specs.
COLLECT_GCC=3Dgcctk
COLLECT_LTO_WRAPPER=3D/local/suz-local/software/local/gcc-trunk/libexec/gcc=
/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=3D/local/suz-local/software/local/gcc-trunk --enable-languages=3Dc=
,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201029 (experimental) [master revision
e1344fe7b6a:a1208522e1a:79991e2348a864ace6ea2bf108a7502862f1129f] (GCC)=20
[509] %=20
[509] % gcctk -O2 -c small.c
[510] %=20
[510] % gcctk -O3 -c small.c
small.c: In function =E2=80=98g=E2=80=99:
small.c:11:6: error: missing =E2=80=98PHI=E2=80=99 def
   11 | void g () {
      |      ^
vect_j_11.9_7 =3D PHI <(10), _8(3)>
during GIMPLE pass: slp
small.c:11:6: internal compiler error: verify_gimple failed
0xd4c3b5 verify_gimple_in_cfg(function*, bool)
        ../../gcc-trunk/gcc/tree-cfg.c:5461
0xbfb79e execute_function_todo
        ../../gcc-trunk/gcc/passes.c:1992
0xbfc682 execute_todo
        ../../gcc-trunk/gcc/passes.c:2046
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[511] %=20
[511] % cat small.c
extern short i (void);

struct {
  short a;
  short b;
} c;

int d, e;
static int f =3D 1;

void g () {
  if (e) {
    if (f)
      goto L;
    while (d) {
      i ();
      short j =3D d, k =3D i (), l =3D k;
    L:
      if (!(d && e) || l)
        goto L;
      c.a =3D j;
      c.b =3D k;
    }
  }
}=