[Bug rtl-optimization/24257] New: ICE: in extract_insn, at recog.c:2084 with -O -fgcse -fgcse-sm

[ferdinandw+gcc at gmail dot com]

/tmp/gcc41/libexec/gcc/i686-pc-linux-gnu/4.1.0/cc1 -quiet -v icefoo.c -dumpbase
icefoo.c -auxbase icefoo -O -version -fgcse -fgcse-sm -o icefoo.s

GNU C version 4.1.0 20051007 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 4.1.0 20051007 (experimental).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129306
Compiler executable checksum: a278381769db4d67bad1ec630ceb45dd
icefoo.c: In function 'oof':
icefoo.c:23: error: unrecognizable insn:
(insn 47 15 19 0 (set (reg:SI 61)
        (ashift:SI (mem/s/j:SI (reg/v/f:SI 59 [ s ]) [0 <variable>.buf+0 S4
A32])
            (subreg:QI (reg/v:SI 60 [ n ]) 0))) -1 (nil)
    (expr_list:REG_DEAD (reg/v:SI 60 [ n ])
        (nil)))
icefoo.c:23: internal compiler error: in extract_insn, at recog.c:2084

Configured with: ../gcc/configure --prefix=/tmp/gcc41 --enable-languages=c
--disable-nls --enable-checking=assert,rtlflag,misc

========================================================

typedef struct A {
    int buf, left;
} A;

static void flush(A *s, int n)
{
    s->buf <<= n;

    while (s->left < 32) {
        s->buf <<= 8;
        s->left += 8;
    }

    s->buf=0;
}

void oof(A *s, int n)
{
    s->buf = n;
    s->left = n;

    flush(s, n);
}

========================================================


-- 
           Summary: ICE: in extract_insn, at recog.c:2084 with -O -fgcse -
                    fgcse-sm
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ferdinandw+gcc at gmail dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24257