[Bug c/43973] New: alpha libiberty/regex.c fails to compile with -O2 without -mbwx (internal compiler error)

[jay dot krell at cornell dot edu]

This code reduced from libiberty/regex.c

typedef unsigned char UCHAR;

void insert_op2 (UCHAR *loc, UCHAR *end)
{
   UCHAR *pfrom = end;
   UCHAR *pto = end + 1;

  while (pfrom != loc)
    *--pto = *--pfrom;
}


jbook2:~ jay$ alpha-dec-vms-gcc -c re.c

jbook2:~ jay$ alpha-dec-vms-gcc -c -O2 re.c
re.c: In function 'insert_op2':
re.c:10:1: error: unrecognizable insn:
(insn 58 57 59 5 re.c:9 (set (reg:DI 120)
        (plus:SI (subreg/s:SI (reg/v/f:DI 108 [ pfrom ]) 0)
            (const_int 1 [0x1]))) -1 (nil))
re.c:10:1: internal compiler error: in extract_insn, at recog.c:2103
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: alpha libiberty/regex.c fails to compile with -O2
                    without -mbwx (internal compiler error)
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jay dot krell at cornell dot edu
 GCC build triplet: Mac/x86
  GCC host triplet: alpha-dec-vms
GCC target triplet: alpha-dec-vms


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43973