[MPlayer-users] Building with SSE3 support

[Jason Garrett-Glaser]

On Mon, Oct 20, 2008 at 7:01 AM, Anssi Saari <anssi.saari at modeemi.fi> wrote:
> On Sat, Oct 18, 2008 at 01:24:23PM -0700, Jason Garrett-Glaser wrote:
>
>> As far as I've experienced, there is zero measurable benefit from
>> -march higher than pentium2 (except for SSE float math maybe), and
>> GCC's autovectorization is patently worthless.
>
> Interesting. I actually tried building Firefox with -ftree-vectorize
> recently, but all I got was a binary that segfaulted immediately.
>
> So is that why it's worthless or is it because even if it produced a
> working binary, it wouldn't be any faster?

It wouldn't be significantly faster, most likely.

Last time I tried vectorization with -march=core2 it attempted to do
an aligned load from an unaligned memory address when initializing an
array and proceeded to crash, so I gave up on that.

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