The MASM Forum

General => The Laboratory => Topic started by: hutch-- on September 14, 2018, 01:11:38 AM

Title: Tweaked version of byte copy.
Post by: hutch-- on September 14, 2018, 01:11:38 AM

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    include \masm32\include\masm32rt.inc
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comment * -----------------------------------------------------
                        Build this  template with
                       "CONSOLE ASSEMBLE AND LINK"
        ----------------------------------------------------- *

    .data?
      value dd ?

    .data
      txt db "This is a test of bcopy",0
      buf db "                       ",0

    bcopy PROTO :DWORD,:DWORD,:DWORD

    .code

start:
   
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    call main
    inkey
    exit

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main proc

    LOCAL psrc  :DWORD
    LOCAL pdst  :DWORD
    LOCAL bcnt  :DWORD

    lea eax, txt
    mov psrc, eax

    lea eax, buf
    mov pdst, eax

    mov eax, LENGTHOF txt
    mov bcnt, eax

    invoke bcopy,psrc,pdst,bcnt

    print pdst,13,10

    ret

main endp

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 OPTION PROLOGUE:NONE
 OPTION EPILOGUE:NONE

 bcopy proc src:DWORD,dst:DWORD,bln:DWORD

    mov eax, esi
    mov edx, edi

    mov esi, [esp+4]
    mov edi, [esp+8]
    mov ecx, [esp+12]
    rep movsb

    mov esi, eax
    mov edi, edx

    ret 12

 bcopy endp

 OPTION PROLOGUE:PrologueDef
 OPTION EPILOGUE:EpilogueDef

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end start
Title: Re: Tweaked version of byte copy.
Post by: jj2007 on September 14, 2018, 02:17:10 AM
About 10% faster than the frame version :t