[Bug target/16909] [3.5 Regression] "unrecognizable insn" ICE during bootstrap

["hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From hjl at lucon dot org  2004-08-07 01:37 -------
[hjl@gnu-20 gcc]$ cat foo.c
typedef struct bitmap_head_def {
  void *first;
  void *current;
  unsigned int indx;
  int using_obstack;
} bitmap_head;

bitmap_head c;

void
bitmap_equal_p ()
{
  memset (&c, 0, sizeof (c));
}
[hjl@gnu-20 gcc]$ stage1/xgcc -Bstage1/ -O2 -S foo.c
foo.c: In function `bitmap_equal_p':
foo.c:13: warning: incompatible implicit declaration of built-in 
function 'memset'
foo.c:14: error: unrecognizable insn:
(insn:HI 17 16 18 0 (parallel [
            (set (mem/s:DI (reg/f:DI 62) [2 c+16 S8 A64])
                (reg:DI 60))
            (set (reg/f:DI 63)
                (plus:DI (reg/f:DI 62)
                    (const_int 8 [0x8])))
            (use (reg:SI 19 dirflag))
        ]) -1 (insn_list 16 (nil))
    (expr_list:REG_DEAD (reg:SI 19 dirflag)
        (expr_list:REG_DEAD (reg:DI 60)
            (expr_list:REG_DEAD (reg/f:DI 62)
                (expr_list:REG_UNUSED (reg/f:DI 63)
                    (nil))))))
foo.c:14: internal compiler error: in extract_insn, at recog.c:2040
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

See

http://gcc.gnu.org/ml/gcc/2004-08/msg00247.html

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16909