[Bug middle-end/59409] [4.9 Regression] 253.perlbmk in SPEC CPU 2K is miscompiled

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59409

--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
loop in Perl_pp_aassign is miscompiled:

  44098a:       e8 91 38 05 00          callq  494220 <Perl_sv_mortalcopy>
  44098f:       67 89 03                mov    %eax,(%ebx)
  440992:       83 c3 04                add    $0x4,%ebx
  440995:       67 44 8b 1b             mov    (%ebx),%r11d
  440999:       45 85 db                test   %r11d,%r11d
  44099c:       74 12                   je     4409b0 <Perl_pp_aassign+0x1c0>
  44099e:       44 89 df                mov    %r11d,%edi

$r11d has invalid memory address.

  4409a1:       c6 05 65 fc 2c 00 00    movb   $0x0,0x2cfc65(%rip)        #
71060d <PL_tainted>
  4409a8:       e8 73 38 05 00          callq  494220 <Perl_sv_mortalcopy>