Verifying compiler optimizations in gcc/g++ by analyzing assembly listings

Question

I just asked a question related to how the compiler optimizes certain C++ code, and I was looking around SO for any questions about how to verify that the compiler has performed

Answer 1

Zoom from RotateRight ( http://rotateright.com ) is mentioned in another answer, but to expand on that: it shows you the mapping of source to assembly in what they call the "code browser". It's incredibly handy even if you're not an asm expert because they have also integrated assembly documentation into the app. And the assembly listing is annotated with comments and timing for several CPU types.

You can just open your object or executable file with Zoom and take a look at what the compiler has done with your code.