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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/60508] internal compiler error: in lra_set_insn_recog_data, at lra.c:1082
Date: Wed, 12 Mar 2014 12:05:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60508

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-03-12
                 CC|                            |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Cleaned up testcase:
int a = 1, g, h = 1, d, e, *f;
char b;
static int c[] = { 0, 0 };
void fn2 (void);

void
fn1 (short x, int l)
{
lab:
  {
    int k, m[0];
    long j = h ? 0 : 0 / 0;
    unsigned char n = j;
    unsigned char i = x >= 0 ? n : n >> x;
    g = i;
    for (;;)
      {
        if (a)
          goto lab;
        while (d)
          {
            e = b = c[l];
            fn2 ();
          }
        int o = m[0];
        f = &k;
      }
  }
}

m[0] is undefined behavior of course, but with the above global variables
unchanged and x >= 0 argument the function should be just endless loop without
triggering undefined behavior.