On 16/01/2016 05:35, Karl Rasche wrote:
I found out that I was getting vastly different speeds even on the same
exr version depending on whether I built libIlmImf myself or used the
system libraries. It seems to have boiled down to compiler releases (gcc
4.4 vs gcc 4.8 vs clang -- the latter two make much faster code for some
reason)
I've seen similar things, at least with gcc 4.1 vs 4.8, with the latter
begin significantly faster in certain decode situations (like 10-15%
faster).
Well gcc42 knows upto sse3, gcc44 knows avx and gcc47 knows avx2 and f16c
Just taking advantage of the newer simd sets would help,
then add some better optimisation from experience with them...
--
FreeBSD - the place to B...Software Developing
Shane Ambler
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