[Bug rtl-optimization/50339] suboptimal register allocation for abs(__int128_t)

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50339



--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> 2012-11-02 14:33:27 
UTC ---

It looks even worse in 4.8:



    movq    %rdi, %r9

    movq    %rsi, %rdi

    movq    %rsi, %r10

    sarq    $63, %rdi

    movq    %rdi, %rcx

    xorq    %r9, %rcx

    movq    %rcx, %rax

    movq    %r10, %rcx

    xorq    %rdi, %rcx

    subq    %rdi, %rax

    movq    %rcx, %rdx

    sbbq    %rdi, %rdx

    ret