Ch 04: Bit Manipulation and Shifts

Which flags in the flags register are affected by the bitwise AND instruction in x86 assembly language?

mov al, 0x0F
and al, 0xF0

Write a procedure 'ConvertBinaryToDecimal' in x86 assembly language that receives the memory address of an ASCII string containing a binary number via the stack. The function should parse the binary string, calculate its equivalent decimal integer value, and print the resulting decimal number on the screen. For example, string '11011' prints 27 and string '1001' prints 9.

push bin_str
call ConvertBinaryToDecimal

Consider the following pseudo-code and write the corresponding optimal x86 assembly code for it: if (al > bl) AND (bl > cl) { cx = 1 }

if (al > bl) AND (bl > cl)
{
    cx = 1
}

Write an x86 assembly language program to swap every adjacent pair of bits in the AX register. For example, if AX = 0x9999 (1001100110011001 in binary), then after execution AX must contain 0x6666 (0110011001100110 in binary).

; Example input: AX = 0x9999
mov bx, ax
and ax, 0xAAAA
shr ax, 1
and bx, 0x5555
shl bx, 1
or ax, bx