Strange bug in optimizator

    .file   "kirienko.cpp"
    .text
    .def    ___tcf_0;   .scl    3;  .type   32; .endef
___tcf_0:
LFB990:
    .cfi_startproc
    subl    $28, %esp
    .cfi_def_cfa_offset 32
    movl    $__ZStL8__ioinit, (%esp)
    call    __ZNSt8ios_base4InitD1Ev
    addl    $28, %esp
    .cfi_def_cfa_offset 4
    ret
    .cfi_endproc
LFE990:
    .def    ___main;    .scl    2;  .type   32; .endef
    .section .rdata,"dr"
LC0:
    .ascii " \0"
    .text
    .globl  _main
    .def    _main;  .scl    2;  .type   32; .endef
_main:
LFB983:
    .cfi_startproc
    pushl   %ebp
    .cfi_def_cfa_offset 8
    .cfi_offset 5, -8
    movl    %esp, %ebp
    .cfi_def_cfa_register 5
    pushl   %edi
    pushl   %esi
    pushl   %ebx
    andl    $-16, %esp
    subl    $64, %esp
    .cfi_offset 3, -20
    .cfi_offset 6, -16
    .cfi_offset 7, -12
    call    ___main
    leal    60(%esp), %eax
    movl    %eax, 4(%esp)
    movl    $__ZSt3cin, (%esp)
    call    __ZNSirsERi
    movl    60(%esp), %eax
    movl    %eax, 24(%esp)
    testl   %eax, %eax
    jle L6
    movl    $0, %ebx
L4:
    leal    _A(,%ebx,8), %eax
    movl    %eax, 4(%esp)
    movl    $__ZSt3cin, (%esp)
    call    __ZNSi10_M_extractIxEERSiRT_
    incl    %ebx
    movl    60(%esp), %eax
    cmpl    %ebx, %eax
    jg  L4
    movl    %eax, 24(%esp)
    movl    %eax, 28(%esp)
    testl   %eax, %eax
    jle L7
    movl    $0, %esi
    movl    $0, %edi
    movl    $0, %ecx
    movl    $0, 32(%esp)
    movl    $0, 36(%esp)
    movl    $0, 40(%esp)
    movl    $0, 44(%esp)
L5:
    movl    _A(,%ecx,8), %eax
    imull   %edi, %eax
    movl    _A+4(,%ecx,8), %edx
    imull   %esi, %edx
    leal    (%eax,%edx), %ebx
    movl    _A(,%ecx,8), %eax
    mull    %esi
    movl    %eax, 16(%esp)
    addl    %ebx, %edx
    movl    %edx, 20(%esp)
    movl    16(%esp), %eax
    movl    20(%esp), %edx
    addl    32(%esp), %eax
    adcl    36(%esp), %edx
    subl    40(%esp), %eax
    sbbl    44(%esp), %edx
    movl    %eax, 32(%esp)
    movl    %edx, 36(%esp)
    movl    _A(,%ecx,8), %eax
    movl    _A+4(,%ecx,8), %edx
    addl    %eax, 40(%esp)
    adcl    %edx, 44(%esp)
    incl    %ecx
    addl    $1, %esi
    adcl    $0, %edi
    cmpl    28(%esp), %ecx
    jne L5
    jmp L3
L6:
    movl    $0, 32(%esp)
    movl    $0, 36(%esp)
    movl    $0, 40(%esp)
    movl    $0, 44(%esp)
    jmp L3
L7:
    movl    $0, 32(%esp)
    movl    $0, 36(%esp)
    movl    $0, 40(%esp)
    movl    $0, 44(%esp)
L3:
    movl    32(%esp), %eax
    movl    36(%esp), %edx
    addl    %eax, %eax
    adcl    %edx, %edx
    addl    40(%esp), %eax
    adcl    44(%esp), %edx
    movl    %eax, 4(%esp)
    movl    %edx, 8(%esp)
    movl    $__ZSt4cout, (%esp)
    call    __ZNSo9_M_insertIxEERSoT_
    movl    $LC0, 4(%esp)
    movl    %eax, (%esp)
    call    __ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
    movl    24(%esp), %edx
    movl    %edx, 4(%esp)
    movl    %eax, (%esp)
    call    __ZNSolsEi
    movl    $0, %eax
    leal    -12(%ebp), %esp
    popl    %ebx
    .cfi_restore 3
    popl    %esi
    .cfi_restore 6
    popl    %edi
    .cfi_restore 7
    popl    %ebp
    .cfi_def_cfa 4, 4
    .cfi_restore 5
    ret
    .cfi_endproc
LFE983:
    .def    __GLOBAL__sub_I_A;  .scl    3;  .type   32; .endef
__GLOBAL__sub_I_A:
LFB991:
    .cfi_startproc
    subl    $28, %esp
    .cfi_def_cfa_offset 32
    movl    $__ZStL8__ioinit, (%esp)
    call    __ZNSt8ios_base4InitC1Ev
    movl    $___tcf_0, (%esp)
    call    _atexit
    addl    $28, %esp
    .cfi_def_cfa_offset 4
    ret
    .cfi_endproc
LFE991:
    .section    .ctors,"w"
    .align 4
    .long   __GLOBAL__sub_I_A
    .globl  _A
    .bss
    .align 32
_A:
    .space 80
.lcomm __ZStL8__ioinit,1,1
    .def    __ZNSt8ios_base4InitD1Ev;   .scl    2;  .type   32; .endef
    .def    __ZNSirsERi;    .scl    2;  .type   32; .endef
    .def    __ZNSi10_M_extractIxEERSiRT_;   .scl    2;  .type   32; .endef
    .def    __ZNSo9_M_insertIxEERSoT_;  .scl    2;  .type   32; .endef
    .def    __ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc;   .scl    2;  .type   32; .endef
    .def    __ZNSolsEi; .scl    2;  .type   32; .endef
    .def    __ZNSt8ios_base4InitC1Ev;   .scl    2;  .type   32; .endef
    .def    _atexit;    .scl    2;  .type   32; .endef