Re: [eigen] need help optimizing with __restrict__ and such

[Michael Olbrich <michael.olbrich@xxxxxxx>]

Hi,

what gcc version are you using? It makes a big difference here:

../a
g++-4.1: 5s
g++-4.2: 5s
g++-4.3: 6s

../b
g++-4.1: 21s
g++-4.2: 4s
g++-4.3: 15s (8s with -fforce-addr)

g++-4.1 (GCC) 4.1.3 20070831 (prerelease) (Debian 4.1.2-16)
g++-4.2 (GCC) 4.2.1 (Debian 4.2.1-5)
g++-4.3 (Debian 4.3-20070902-1) 4.3.0 20070902 (experimental) [trunk revision 128028]

I have no idea though what's the reason for this big difference.

michael

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