Hello,

finally, I've found the time to compare the different compilations of 
povray on a Pentium IV.  I used megapovplus and modified povbench.pov from 
povray 3.5 beta to run on it.

Running time in seconds:
               P-IV   Athlon
gcc 2.95.3    13354    7035
gcc 3.0.1     11319    6555
gcc 3.1        8971    5901
icc 6         15907    5679
icc 6 IV      10589

"P-IV" is a Intel(R) Pentium(R) 4 CPU 1.60GHz
running SuSE Linux with kernel 2.4.16-4GB

"Athlon" is a AMD Athlon(TM) XP 1500+ (1343.051 MHz)
running SuSE Linux with kernel 2.4.10-4GB

Compiling options were:
gcc 2.95.3  -O3 -finline-functions -ffast-math -ansi -march=i686 -DCPU=686
gcc 3.0.1   -O3 -finline-functions -ffast-math -foptimize-sibling-calls 
-ansi -march=i686 -DCPU=686
gcc 3.1     -O3 -finline-functions -ffast-math -foptimize-sibling-calls 
-ansi -march=i686 -DCPU=686
icc 6       -O3 -tpp6  -xK -unroll -ip
icc 6 IV    -O3 -tpp7  -xW -unroll -ip

The last version is optimized for Pentium-IV. That's why the binary doesn't 
run on the Athlon.

Best regards
Thomas

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