Unam3dd

#include <stdio.h>

#define IS_ALPHA(c) ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))

char *rot13_cipher(char *dst, char *src)
{
    char *tmp = dst;

    while (*src) {

Unam3dd

atoi example

https://fr.wikipedia.org/wiki/Table_de_v%C3%A9rit%C3%A9

Bitwise tricks

All these tricks are also used in cryptography and obfuscation methods.

AND
Take bits in bytes

Unam3dd

#include <stdio.h>

int	ft_atoi(char *str)
{
	long long			to_dec = 0;
	int				neg = 1;

	while (!(*str ^ ' ') || (*str >= '\t' && *str <= '\r'))
		str = (char *)-~(unsigned long long)str; // Wtff dude
	while ((!(*str ^ '+') || !(*str ^ '-')))

Unam3dd

.intel_syntax noprefix

.global __vs_strlen_slow

.section .text

__vs_strlen_slow:
	endbr64
	test rdi, rdi
	jz .L_ret_zero

Unam3dd

.intel_syntax noprefix
.global __vs_strlen_sse2

.section .text

__vs_strlen_sse2:
	endbr64
	test rdi, rdi
	jz .L_null
	pxor xmm0, xmm0

Unam3dd

.intel_syntax noprefix
.file "__strlen_sse42"

.section .text, "ax"

.globl __vs_strlen_sse42

__vs_strlen_sse42:
	endbr64
	xor rax, rax

Unam3dd

.intel_syntax noprefix
.global __vs_strlen_avx2

.section .text

__vs_strlen_avx2:
	endbr64
	test rdi, rdi
	jz .L_null
	cmp byte ptr [rdi], 0

Unam3dd

.intel_syntax noprefix

.global __vs_memmove_erms_aligned

.section .text

__vs_memmove_erms_aligned:
	endbr64
	mov rax, rdi
	test rdi, rdi

Unam3dd

.intel_syntax noprefix
.global __vs_memmove_erms

.section .text

__vs_memmove_erms:
	endbr64
	mov rax, rdi
	test rdi, rdi
	jz .L_ret

Unam3dd

#include "vs_std.h"
#include "_vs_std.h"
#include <cpuid.h>

/////////////////////////////
//
//		INCLUDES
//
/////////////////////////////