x86_64

[Yang Zhang]

Are there any good resources for learning about gcc's x86_64 assembly 
output?  When I run `gcc -S a.c` for a simple test C program like the 
one below, I can completely understand the resulting go.s on a 32-bit 
x86, but as soon as I run that on a 64-bit machine, I'm lost.  I know 
what the instructions are (i.e. I know how to use the AMD manuals), but 
I'd like to learn about gcc's assembly output: the exact new calling 
conventions (registers seem to be more liberally used over the stack now 
even without opt), all these 
.LFB/.LCFI/.LFE/.Lframe/.LSCIE/.LSFDE/.LASFDE/... labels, and so on. 
Thanks in advance for any guidance.

void foo(int a, int b, int c) { char xs[5]; char ys[10]; }
int main() { foo(1,2,3); return 0; }

-- 
Yang Zhang
http://www.mit.edu/~y_z/