// Problem: gcc optimizer produces duplicate "shl" instructions
// use gcc test1.cpp -o test1 -O3 -g
// then use gcc test1, disas main

struct zz1s{
        int a;
        int b;
        int c;
        int d;
};

long var1 = 0;
zz1s zz1[50];

int main()
{
        zz1[var1].a = 0;
        zz1[var1+1].a = 0;
        zz1[var1+2].a = 0;
        zz1[var1+3].a = 0;
        zz1[var1+4].a = 0;
        zz1[var1+5].a = 0;
        zz1[var1+6].a = 0;
        zz1[var1+7].a = 0;
        return 0;
}


/*
(gdb) disas main
Dump of assembler code for function main():
   0x00000000004003c0 <+0>:     mov    0x2008d9(%rip),%rax        # 0x600ca0 <var1>
   0x00000000004003c7 <+7>:     mov    %rax,%rdx
   0x00000000004003ca <+10>:    shl    $0x4,%rdx
   0x00000000004003ce <+14>:    movl   $0x0,0x600980(%rdx)
   0x00000000004003d8 <+24>:    mov    %rax,%rdx
   0x00000000004003db <+27>:    shl    $0x4,%rdx
   0x00000000004003df <+31>:    movl   $0x0,0x600990(%rdx)
   0x00000000004003e9 <+41>:    mov    %rax,%rdx
   0x00000000004003ec <+44>:    shl    $0x4,%rdx
   0x00000000004003f0 <+48>:    movl   $0x0,0x6009a0(%rdx)
   0x00000000004003fa <+58>:    mov    %rax,%rdx
   0x00000000004003fd <+61>:    shl    $0x4,%rdx
   0x0000000000400401 <+65>:    movl   $0x0,0x6009b0(%rdx)
   0x000000000040040b <+75>:    mov    %rax,%rdx
   0x000000000040040e <+78>:    shl    $0x4,%rdx
   0x0000000000400412 <+82>:    movl   $0x0,0x6009c0(%rdx)
   0x000000000040041c <+92>:    mov    %rax,%rdx
   0x000000000040041f <+95>:    shl    $0x4,%rdx
   0x0000000000400423 <+99>:    movl   $0x0,0x6009d0(%rdx)
   0x000000000040042d <+109>:   mov    %rax,%rdx
   0x0000000000400430 <+112>:   xor    %eax,%eax
   0x0000000000400432 <+114>:   shl    $0x4,%rdx
   0x0000000000400436 <+118>:   movl   $0x0,0x6009e0(%rdx)
   0x0000000000400440 <+128>:   movl   $0x0,0x6009f0(%rdx)
   0x000000000040044a <+138>:   retq
*/