[Bug rtl-optimization/122919] Unnecessary duplication of shifts with computed goto

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122919

--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Thomas Koenig from comment #4)
> Here's another test case, which has two full divisions:

Of course, it does not. I meant "exhibits the two shrq instructions".

There is no need to use %rax in

        movq    %rdx, %rax
        shrq    $3, %rdx
        shrq    $3, %rax
        andl    $4294967295, %edx
        leaq    (%rax,%rax,4), %rcx

(with no further use of the value in %rax)