[Bug tree-optimization/57318] [4.9 Regression] optimizer takes several seconds on nested loops

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57318

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu.org
   Target Milestone|---                         |4.9.0
            Summary|optimizer takes several     |[4.9 Regression] optimizer
                   |seconds on nested loops     |takes several seconds on
                   |                            |nested loops

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
4.8 compiles this to just

main:
.LFB0:
        .cfi_startproc
        movl    $10, %eax
        movl    $10, b(%rip)
        movl    $10, a(%rip)
        movw    %ax, u+4(%rip)
        ret