c++ - Learning to read GCC assembler output

Question

I'm considering picking up some very rudimentary understanding of assembly. My current goal is simple: VERY BASIC understanding of GCC assembler output when compiling C/C++ with the -S switch for x86/x86-64.

Just enough to do simple things such as looking at a single function and verifying whether GCC optimizes away things I expect to disappear.

Does anyone have/know of a truly concise introduction to assembly, relevant to GCC and specifically for the purpose of reading, and a list of the most important instructions anyone casually reading assembly should know?

question from:https://stackoverflow.com/questions/2611359/learning-to-read-gcc-assembler-output

Answer 1

You should use GCC's -fverbose-asm option. It makes the compiler output additional information (in the form of comments) that make it easier to understand the assembly code's relationship to the original C/C++ code.