g++ optimizer flag

[Yue Li]

Hello,

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, may I ask is there really a flag in
g++
that can provide a list of optimization done on my code? I found xlC
could provide a list of optimized code resulting from only loop
transformations.

Thanks,

Yue