[Bug tree-optimization/55124] [4.8 Regression] ICE in find_or_generate_expression, at tree-ssa-pre.c:2803

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55124

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.8.0
            Summary|ICE in                      |[4.8 Regression] ICE in
                   |find_or_generate_expression |find_or_generate_expression
                   |, at tree-ssa-pre.c:2803    |, at tree-ssa-pre.c:2803

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2012-10-30 10:18:15 UTC ---
Before the revision we were successfully able to insert

Inserted pretmp_46 = c;
 in predecessor 4
Inserted pretmp_47 = (int) pretmp_46;
 in predecessor 4

while after the revision we ICE.

Simplified testcase:

int a, b;
long c;

static void f2(void)
{
  unsigned long k = 1;

  foo(b ? k = 0 : 0);

  b = ((c = b) ? (k ? : (c = 0)) : a) * c;
}

void f1(void)
{
  f2();

  a = b | c;
}