You probably mean -tpp7, right? That is the same as -mcpu=p4. You'll
Uh, yeah, right.
get more performance by also adding -xW, which enables icc to emit p4 instructions and vectorize loops.
If you look back, you see that I also made -axKW a default command line option. I don't know what the cost is of the multi-arch optimizations though (i.e if it has 3 versions of the same method, what is the method calling overhead?)
/ David Hedbor
Previous text:
2003-02-07 20:42: Subject: Re: gcc/icc
In the last episode (Feb 07), David Hedbor @ Pike developers forum said:
Now with corresponding optimizations (-O3 -ipp7).
I believe -ipp7 is the default actually, so the only difference would be -O3 (if you can figure out a way to enable that without enabling -O2 for icc and without enabling -O3 for other compilers, feel free to do so).
You probably mean -tpp7, right? That is the same as -mcpu=p4. You'll get more performance by also adding -xW, which enables icc to emit p4 instructions and vectorize loops.
-- Dan Nelson dnelson@allantgroup.com
/ Brevbäraren