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From: "doko at debian dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/94670] New: ICE in extract_insn, at
 recog.c:2310 on s390x-linux-gnu with -march=z13
Date: Mon, 20 Apr 2020 12:54:18 +0000
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X-Bugzilla-Component: rtl-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94670

            Bug ID: 94670
           Summary: ICE in extract_insn, at recog.c:2310 on
                    s390x-linux-gnu with -march=3Dz13
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at debian dot org
  Target Milestone: ---

Seen on the gcc-8, gcc-9 branches and trunk, worked around with -O2.

$ cat hb-set.ii
struct f {
  long operator[](int i) { return c.d[i]; }
  struct {
    long d[sizeof 0];
  } c;
};
template <typename e> struct o {
  int g;
  e h;
  e &operator[](int i) {
    e *j;
    unsigned b =3D i;
    j =3D &h;
    return j[b];
  }
};
int k, m;
unsigned l;
struct n {
  struct C {
    int t() {
      int p =3D l =3D sizeof(d);
      for (unsigned b =3D 0; b < l; b++) {
        long q =3D d[b], d =3D q;
        k =3D __builtin_popcountl(d);
        p +=3D k;
      }
      return p;
    }
    f d;
  };
  o<C> pages;
  int m_fn1() {
    unsigned a =3D pages.g;
    for (unsigned b =3D 0; b < a; b++)
      m +=3D pages[b].t();
    return m;
  }
} r;
void s() { r.m_fn1(); }


$ s390x-linux-gnu-g++ -c -mbackchain -march=3Dz13 -mzarch -O3 -Wall
-Wno-strict-aliasing -std=3Dgnu++98 -fno-stack-protector hb-set.ii
hb-set.ii: In function =E2=80=98void s()=E2=80=99:
hb-set.ii:40:23: error: unrecognizable insn:
   40 | void s() { r.m_fn1(); }
      |                       ^
(insn 109 108 110 7 (set (reg:V16QI 1302)
        (unspec:V16QI [
                (subreg:V16QI (subreg:V2DI (reg:V16QI 1300) 0) 0)
            ] UNSPEC_POPCNT)) "hb-set.ii":25:32 -1
     (nil))
during RTL pass: vregs
hb-set.ii:40:23: internal compiler error: in extract_insn, at recog.c:2310
Please submit a full bug report,
with preprocessed source if appropriate.=