[Bug optimization/11403] [3.4 regression] ICE in cgraph_remove_edge with -O3 (unit-at-a-time problem)

["bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11403


bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jh at suse dot cz
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-07-02 14:36:17
               date|                            |
            Summary|ICE in cgraph_remove_edge,  |[3.4 regression] ICE in
                   |at cgraph.c:182 when        |cgraph_remove_edge with -O3
                   |compiling with -O3          |(unit-at-a-time problem)


------- Additional Comments From bangerth at dealii dot org  2003-07-02 14:36 -------
Indeed. Using -O3 -fno-unit-at-a-time makes the ICE go away.

Surprisingly, I don't need the include. Here's my minimal testcase:
----------------------------------
struct S {
    double *d;
    double &operator[] (int n) {return d[n];}
};

void foo (bool b) {
  S s;
  s[3] = b ? 1. : 2.;
}
-----------------------------------

tmp/gg> ../build-gcc/gcc-install/bin/c++ -c -O3 x.ii
<internal>: In function `void foo(bool)':
<internal>:8: internal compiler error: in cgraph_remove_edge, at cgraph.c:182
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

tmp/gg> ../build-gcc/gcc-install/bin/c++ -c -O3 x.ii -fno-unit-at-a-time

This is with a snapshot built tonight. Jan, would you mind taking a look?

W.