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ASM Memset example(MASM32)

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Code: 
>.386
.model flat, stdcall
option casemap:none
include \masm32\include\windows.inc
include \masm32\include\user32.inc
includelib \masm32\lib\user32.lib
.data
M db "this will be filled with xs",0
.code

memset proc source:dword, dest:dword, ln:dword
pushad
mov edi,dest
mov ecx,ln
mov	eax, source
cld
rep stosb
popad
ret
memset endp

start:
invoke MessageBox, NULL,addr M, addr M, MB_OK
invoke memset,"x", offset M, sizeof M - 1     ;fill procedure
invoke MessageBox, NULL,addr M, addr M, MB_OK
ret
END start
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