[Bug target/62011] False Data Dependency in popcnt instruction

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62011

--- Comment #9 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
This is not u32 version but u64. The first loop (u32) version looks like:

.L23:
    leal    1(%rdx), %ecx
    xorq    %rax, %rax    
    popcntq    (%rbx,%rax,8), %rax
    leal    2(%rdx), %r8d
    xorq    %rcx, %rcx    
    popcntq    (%rbx,%rcx,8), %rcx
    addq    %rax, %rcx
    leal    3(%rdx), %esi
    xorq    %rax, %rax    
    popcntq    (%rbx,%r8,8), %rax
    addq    %rax, %rcx
    xorq    %rax, %rax    
    popcntq    (%rbx,%rsi,8), %rax
    addq    %rax, %rcx
    leal    4(%rdx), %eax
    addq    %rcx, %r14
    movq    %rax, %rdx
    cmpq    %rax, %r12
    ja    .L23