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Re: [RFC][PATCH 2/3] math128: Introduce {mult,add,cmp}_u128

On 04/24/2012 02:54 PM, Peter Zijlstra wrote:
> -       andl    $4294967295, %edx
>         shrq    $32, %rcx
> -       andl    $4294967295, %esi
> +       mov     %esi, %esi

If you can *ever* get gcc to generate those andl instructions on x86,
then please file a gcc bug report: the constant is 0xffffffff and those
are plain zero-extension instructions which is much better done with mov.


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