Assembly Wrappers

Consists of simple functions and simple sorts written in embedded assembly in C++.

Uses MSVC inline assembly (__asm, Intel x86).

Tested in Windows / Visual Studio 2017

Setup

Add both pairs to your project:

• assembly_inline_functions.h + assembly_inline_functions.cpp
• assembly_sort_functions.h + assembly_sort_functions.cpp

assembly_inline_functions

Function	Returns	Instruction(s)
Add(a, b)	int	add
Sub(a, b)	int	sub
Mul(a, b)	__int64	mul (EDX:EAX)
Div(a, b)	int	div (64-bit a → EDX:EAX, divide by b)
Equal, Greater, GreaterEqual, Lower, LowerEqual	bool	cmp + branch
Not, And, Or, Xor	bool	not / and / or / xor on AL
Index(arr, i)	int	[ebx + eax*4]
LLShift, RLShift(a, count)	int	shl, shr
LCShift, RCShift(a, count)	int	rol, ror

Shift count is __int8 (loaded into CL).

assembly_sort_functions

In-place ascending sort. n = number of int elements.

Function	Algorithm
AssemblerBubbleSort(adress, n)	bubble
AssemblerSelectionSort(adress, n)	selection

Example:

int arr[] = { 5, 2, 8, 1 };
AssemblerBubbleSort(arr, 4);  // arr is modified

The pointer parameter is spelled adress in the headers — keep it when calling.