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From: "cnsun at uwaterloo dot ca" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/104178] New: -fcompare-debug failure at -O3 -m32
Date: Sat, 22 Jan 2022 05:04:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104178

            Bug ID: 104178
           Summary: -fcompare-debug failure at -O3 -m32
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cnsun at uwaterloo dot ca
  Target Milestone: ---

$ gcc-trunk small.c -w -m32 -fcompare-debug -O3
gcc-trunk: error: small.c: =E2=80=98-fcompare-debug=E2=80=99 failure (lengt=
h)
$ cat small.c
static int a, g, h, k, l, m, p, r, s, u, w, z, aa, ab, ac, ad;
char b, ae, af;
struct c {
  int d;
  int e;
} e[1];
static char f;
static short i;
static struct c j, x;
static unsigned n;
int *o, *t;
static char q;
int v;
int y;
int ag;
int ah;
int ai;
int aj;
int ak;
static char al() {
  int am[] =3D {0, 1, 9, 6, 3, 4, 3, 0, 3, 4, 3, 9, 0, 6, 1, 1, 6, 0, 2, 4,
              6, 4, 2, 4, 6, 1, 1, 6, 0, 9, 9, 0, 3, 0, 3, 4, 3, 0, 3};
  int an =3D 8, ao =3D r;
  int c[] =3D {2, 2, 2, 2, 2};
  char ap;
  if (ao) {
    ap =3D af;
    for (; t; t++)
      printf("index =3D \n");
  }
  af =3D r =3D ao;
  int *aq =3D 0;
  {
    int *b[] =3D {o, o, o, o, o, o, o, o, o, o, o, o, o};
    if (r) {
      struct c c[] =3D {*e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e,=
 *e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *e, *=
e,
                      *e, *e, *e, *e, *e, *e, *e, *e};
      k =3D ab;
      for (; u;) {
        struct c d =3D {1};
        ak =3D 0;
        int ar =3D f ^ p;
      as:
        if (ar) {
          printf("", p);
          p =3D a ^ p;
        }
      }
    }
    if (z)
      goto at;
    a =3D l;
    an =3D 5;
  }
  if (f) {
    int *au[10];
    aa =3D 0;
    for (; aa < 10; aa++)
      au[aa] =3D &an;
    for (; m;)
      ;
    a =3D r;
  }
  if (g)
    f =3D 1;
  for (; f;) {
    while (an < 5 || i)
      ae =3D q;
    int c[] =3D {*o, *o, *o, *o, *o, *o, *o, *o, *o, *o, *o, *o, *o};
    if (w)
      for (;;) {
        if (r)
          break;
        a =3D a ^ printf(&b);
        for (; ac; ac++)
          ;
      }
    else
      *aq =3D r;
    ai =3D r;
    n =3D (an || ~r) + n || j.d;
    if (r)
      a =3D a ^ 5;
    if (s)
      printf(&b);
    printf("", s);
    if (p) {
      s =3D 3;
      for (; s;)
        if (ap)
          ap =3D 0;
    }
    int av =3D h ^ q, aw =3D j.e ^ av;
    while (h++) {
      a =3D a ^ 5;
      if (k)
        printf(&b);
    }
    if (aw)
      v =3D j.e ^ q;
  at:
    b =3D ag =3D w =3D 0;
    if (f)
      goto ax;
    z =3D h;
    a =3D k;
    if (n)
      printf("", m);
    if (k) {
      printf("", k);
      m =3D n & m + k;
    }
    a =3D j.d;
    u =3D n + l;
    if (ah)
      break;
  ay:
    if (l)
      q =3D j.d;
  }
  int az =3D i || m;
  int ba =3D g || f;
  g =3D i =3D az;
  *e =3D x;
  char bb =3D n & m & p || r;
ax:
  if (y) {
    printf("", ba);
    goto as;
  }
  af =3D bb;
  b =3D i | n;
  if (j.d)
    printf("", e);
  char bc =3D p & n | i;
  n =3D bc;
  int bd =3D l & m;
  m =3D bd;
  if (aj) {
    printf("", ad);
    m =3D l;
    goto ay;
  }
  l =3D f;
  j =3D e[0];
}
int main() { al(); }
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=3Dgcc-trunk
COLLECT_LTO_WRAPPER=3D/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-lin=
ux-gnu/12.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.OLkXuGPSxC-gcc-builder/gcc/configure
--enable-languages=3Dc,c++,lto --enable-checking-yes --enable-multiarch
--prefix=3D/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.1 20220121 (experimental) [master -gcaca8eddd] (GCC)=20
$=