22 Apr
2005
22 Apr
'05
10:53 a.m.
neither is sickle version of matrix~, nor any other sickle clone. When I was experimenting back then with gcc-2.95, the consistent pattern was that -funroll-loops performed slightly better than unrolling by hand.
well, that's interesting ... there are three different factors for speeding up things:
- using SIMD instructions (single instruction multiple data)
- using aligned memory operations movaps / movups
- loop unrolling ... loop unrolling is necessary for simd instructions, since the parallel instructions can be used (although i've never seen a compiler producing the specific code)
cheers ... tim
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