[Bug middle-end/46461] New: [4.6 Regression] ICE: invalid argument to gimple call at -O with __builtin_memset()

["zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46461

           Summary: [4.6 Regression] ICE: invalid argument to gimple call
                    at -O with __builtin_memset()
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


----- testcase.c -----
void
foo (char *c)
{
  c[7] = 0xff;
  __builtin_memset (c + 8, 0xff, 8);
}
----------------------

Compiler output:
$ gcc -O testcase.c
testcase.c: In function 'foo':
testcase.c:6:1: error: invalid argument to gimple call
&MEM[(char *)c_1(D) + 7B]

Strangely, no regular ICE message i s given.

With -foptimize-sibling-calls, there is the message:
$ gcc -O -foptimize-sibling-calls testcase.c 
testcase.c: In function 'foo':
testcase.c:6:1: error: invalid argument to gimple call
&MEM[(char *)c_1(D) + 7B]
testcase.c:6:1: internal compiler error: in refs_may_alias_p_1, at
tree-ssa-alias.c:989
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.

Tested revisions:
r166604 - crash
r166509 - crash
r163636 - OK
4.5 r166509 - OK