[cairo] [PATCH] MMX and SSE work will not overlap for a few days.
andrelrt at gmail.com
Tue Mar 18 04:21:46 PDT 2008
That's ok to me, I'm working only in SSE2 code and I promise to don't
touch anything before ask you so :)
BTW, Look at the e-mail from Jeff Muizelaar about a change in
pix_multiply function, he made some math optimization in the code.
Appling his optimization in MMX code, the pix_multiply can be changed
to something like:
mmx_4x0101 = 0x0101010101010101ULL,
static inline __m64
pix_multiply (__m64 a, __m64 b)
res = _mm_mullo_pi16 (a, b);
res = _mm_adds_pu16 (res, MC(4x0080));
res = _mm_mulhi_pu16 (res, MC(4x0101));
This modification speeds up the SSE2 code a lot and can be applied in
MMX code too.
On Mon, Mar 17, 2008 at 2:11 PM, Frédéric Plourde
<frederic.plourde at polymtl.ca> wrote:
> For the next few days, I think our work won't overlap, as I'll be
> working exclusively on MMX code. I found many perf regressions and weird
> behaviors that I'm going to take a look at and resolve (many patches are
> coming up soon). Even with SSE2 enabled, MMX paths seem important to me
> because my team still need to maintain non-SSE systems like the OLPC.
> I'll keep you posted if I change course.
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