GCC optimization flags for Intel Atom [closed]

Question

I'm developing a performance critical application for Intel Atom processor.

What are the best gcc optimization flags for this CPU?

Answer 1

Just like for Pentium 4:

-march=prescott -O2 -pipe -fomit-frame-pointer

Answer 2

here's some cross-pollenation of blogs... what i was really hoping for was a firefox-compiled-for-atom benchmark...

Address : http :// ivoras.sharanet.org/blog/tree/2009-02-11.optimizing-for-atom.html

"As it turns out, gcc appears to do a very decent job with -mtune=native, and mtune=generic is more than acceptable. The biggest gains (in this math-heavy benchmark) come from using SSE for math, but even they are destroyed by tuning for pentium4.

"The difference between the fastest and the slowest optimization is 21%. The impact of using march instead of mtune is negligible (not enough difference to tell if it helps or not).

"(I've included k6 just for reference - I know Atom doesn't have 3dnow)

"Late update: Tuning for k8 (with SSE and O3) yields a slightly higher best score of 182."

Answer 3

From Intel, Getting Started with MID

When using GCC to compile, there are a few recommended flags to use:

• -O2 or -O1: O2 flag optimizes for speed, while the -O1 flag optimizes for size
• -msse3
• -march=core2
• -mfpmath=sse