[flac-dev] Again about encoding speed of different compiles

[Erik de Castro Lopo]

lvqcl wrote:

> Encoding time, in seconds:
> GCC  32-bit: 180 (16% speedup)
> ICC  32-bit: 121 (7.5%)
> VS10 32-bit: 439 (sic!)
> VS12 32-bit: 440 (sic!)
> 
> GCC  64-bit: 72.8 (9%)
> ICC  64-bit: 75.0 (8%)
> VS10 64-bit: 75.7 (7%)
> VS12 64-bit: 77.7 (7%)
> 
> 
> Also I wonder what other functions can also benefit from `restrict'
> keyword?..

For others to reference, this is the GCC documentations on __restrict:

    http://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html

Googling suggests that use of restrict is a little controvertial. Eg:

    http://stackoverflow.com/questions/2005473/rules-for-using-the-restrict-keyword-in-c
    http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
    http://blog.frama-c.com/index.php?post/2012/07/25/On-the-redundancy-of-C99-s-restrict

Also, do you have any idea why this causes such a slow down in VS10 and
VS12?

Erik
-- 
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Erik de Castro Lopo
http://www.mega-nerd.com/