[Bug target/49714] New: [4.7 Regression] Revision 176128 introduced many ICEs in insn_default_length, at config/i386/i386.md:600

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49714

           Summary: [4.7 Regression] Revision 176128  introduced many ICEs
                    in insn_default_length, at config/i386/i386.md:600
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: rth@gcc.gnu.org, iains@gcc.gnu.org
              Host: x86_64-apple-darwin10
            Target: x86_64-apple-darwin10
             Build: x86_64-apple-darwin10


On x86_64-apple-darwin10, revision 176128 introduced a lot of failures in the
test suite of the kind:

[macbook] f90/bug% /opt/gcc/gcc4.7p/bin/g++
/opt/gcc/work/gcc/testsuite/g++.old-deja/g++.other/dyncast1.C
/opt/gcc/work/gcc/testsuite/g++.old-deja/g++.other/dyncast1.C: In member
function 'void E::_ZThn8_N1ED1Ev()':
/opt/gcc/work/gcc/testsuite/g++.old-deja/g++.other/dyncast1.C:123:1: error:
unrecognizable insn:
(jump_insn 3 2 4 (set (pc)
        (mem:QI (const:DI (unspec:DI [
                        (symbol_ref/i:DI ("_ZN1ED1Ev") [flags 0x1]
<function_decl 0x1428b7400 __comp_dtor >)
                    ] UNSPEC_GOTPCREL)) [0 S1 A8])) -1
     (nil))
/opt/gcc/work/gcc/testsuite/g++.old-deja/g++.other/dyncast1.C:123:1: internal
compiler error: in insn_default_length, at config/i386/i386.md:600