Why does C not push a pointer on the stack when calling a assembly function?

Question

I am currently trying to get some experience with calling assembly functions from C. Therefore, I created a little program which calculates the sum of all array elements.

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Answer 1

The calling convention the C compiler will use depends on your system, metadata you pass to the compiler and flags. It sounds like your compiler is using the System V AMD64 calling convention detailed here: https://en.m.wikipedia.org/wiki/X86_calling_conventions (implying that you're using a Unix-like OS on a 64 bit x86 chip). Basically, in this convention most arguments go into registers because it's faster and the 64 bit x86 systems have enough registers to make this work (usually).