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| From: | Gordan Bobic |
| Subject: | Re: [Help-gsl] Re: C/C++ speed optimization bible/resources/pointers needed, and about using GSL... |
| Date: | Fri, 27 Jul 2007 16:40:57 +0100 |
| User-agent: | Thunderbird 2.0.0.5 (Windows/20070716) |
Jochen Küpper wrote:
Twice as many floats vectorize per operation as doubles. Thus it goes twice as fast. How much more evidence do you require?Personally I do not need any -- I have to use double for precision needs. Matrices are just to big and calculation paths too long.Sometimes I wish I had a 16-byte-double Cray...
long double on x86-64 is 16 bytes, if you _really_ feel the need for it. long double on IA32 is 12 bytes.
Gordan
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