Re: Qt

[Ludovic Courtès]

Andreas Enge <address@hidden> skribis:

> On Tue, Oct 08, 2013 at 11:05:04PM +0200, Ludovic Courtès wrote:
>> Andreas Enge <address@hidden> skribis:
>> > Also, the build uses
>> > sse/sse2/... instructions according to what is available on the
>> > processor; we might wish to disable all or at least the most advanced
>> > of them in the long run.
>> If it’s a matter of adding the right configure flag, I’d do it before
>> it bites.
>
> The following will leave out any special instructions, as far as I can see:
> +                              "-no-sse2"
> +                              "-no-sse3"
> +                              "-no-ssse3"
> +                              "-no-sse4.1"
> +                              "-no-sse4.2"
> +                              "-no-avx"
> +                              "-no-avx2"
> +                              "-no-neon"
> +                              "-no-mips_dsp"
> +                              "-no-mips_dspr2"))))
>
> I do not know how much this slows down qt applications. According to 
> wikipedia,
> sse2 arrived in 2001. So one could argue that adding it would exclude almost
> no machines.

Yes, you may be right for SSE2 (especially considering the fact that
this kind of software is typically used on fairly recent machines.)

Ludo’.