#include <stdio.h>

void reverse_string(char *str)
{
	__asm
	(
	"mov ecx, 0xFFFFFFFF\n\t"
	"xor eax, eax\n\t"
	"mov edi, %0\n\t"
	"repne scasb\n\t"
	"not ecx\n\t"
	"sub ecx, 1\n\t"
	"mov esi, %0\n\t"
	"mov edi, ecx\n\t"
	"dec edi\n\t"
	"lea edi, [esi+edi]\n\t"
	"swap_bytes:\n\t"
	"mov al, [esi]\n\t"
	"mov bl, [edi]\n\t"
	"mov [esi], bl\n\t"
	"mov [edi], al\n\t"
	"inc esi\n\t"
	"dec edi\n\t"
	"cmp esi, edi\n\t"
	"jb swap_bytes\n\t"
	:"+m"(str)::"memory", "cc", "eax", "ecx", "esi", "edi", "al", "bl"
	);
}

int main(void)
{
	char string[] = "michal bialek";
	printf("%s\n", string);
	reverse_string(string);
	printf("%s\n", string);
	printf("%c\n", string[0]);
	return 0;
}