g++ optimizer report?

[Yue K. Li]

Hi,

I'm trying to figure out what optimizations have actually been
performed by g++ on my matrix multiplication code, I was looking for
such an flag of
g++, but seems could not find one when I read g++'s man page, may I
ask is there really a flag in
g++ that can provide a list of optimization done on my code? I found that xlC
could provide a list of optimized code resulting from only loop
transformations, which is very helpful
when analyzing performance.

Thanks,

Yue