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2. x86 calling conventions - Wikipedia

   en.wikipedia.org/wiki/X86_calling_conventions

   POD return values 33–64 bits in size are returned via the EAX:EDX registers. Non-POD return values or values larger than 64-bits, the calling code will allocate space and passes a pointer to this space via a hidden parameter on the stack. The called function writes the return value to this address. Stack aligned on 4-byte boundary. stdcall ...

3. pragma once - Wikipedia

   en.wikipedia.org/wiki/Pragma_once

   Using #pragma once allows the C preprocessor to include a header file when it is needed and to ignore an #include directive otherwise. This has the effect of altering the behavior of the C preprocessor itself, and allows programmers to express file dependencies in a simple fashion, obviating the need for manual management.

4. Calling convention - Wikipedia

   en.wikipedia.org/wiki/Calling_convention

   The caller passes the address of a list of argument addresses in register 1. The last address has the high-order bit set to indicate the end of the list. This limits programs using this convention to 31-bit addressing. The address of the called routine is in register 15.

5. x86 instruction listings - Wikipedia

   en.wikipedia.org/wiki/X86_instruction_listings

   If source operand is all-0s, then LZCNT will return operand size in bits (16/32/64) and set CF=1. LZCNT r64,r/m64: F3 REX.W 0F BD /r: BMI1 Bit Manipulation Instruction Set 1: TZCNT r16,r/m16 TZCNT r32,r/m32: F3 0F BC /r: Count Trailing zeroes. [c] If source operand is all-0s, then TZCNT will return operand size in bits (16/32/64) and set CF=1 ...

6. GNU Compiler Collection - Wikipedia

   en.wikipedia.org/wiki/GNU_Compiler_Collection

   Regarding language version support for C++ and C, since GCC 11.1 the default target is gnu++17, a superset of C++17, and gnu11, a superset of C11, with strict standard support also available. GCC also provides experimental support for C++20 and C++23. [46]

7. Function prologue and epilogue - Wikipedia

   en.wikipedia.org/wiki/Function_prologue_and_epilogue

   As an example, here is a typical x86 assembly language function prologue as produced by the GCC push ebp mov ebp , esp sub esp , N The N immediate value is the number of bytes reserved on the stack for local use.