What is test equal to after each of these instructions?
section .data
test: dq -1
section .text
mov byte[test], 1 ;1
mov word[test], 1 ;2
mov dword[test], 1 ;4
mov qword[test], 1 ;8section .data
test: dq -1 ; we started with test = 0xFFFFFFFFFFFFFFFF
section .text
; In the following lines we are going to write all 8 bytes separately
mov byte[test], 1 ; test: 01 FF FF FF FF FF FF FF
mov word[test], 1 ; test: 01 00 FF FF FF FF FF FF
mov dword[test], 1 ; test: 01 00 00 00 FF FF FF FF
mov qword[test], 1 ; test: 01 00 00 00 00 00 00 00
The little endian convention explains, why are we seeing the 8-byte format filling with zeros from left to right. The bytes in memory are stored in reverse order, the least significant byte being the first.