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To speed things up you might wanna replace movsb with movsw, especially for larger data blocks:<br />
<br />
mov cx,[bp+12]<br />
lds si,[bp+8]<br />
les di,[bp+4] <br />
<br />
shr cx,1 &nbsp; ;divide by 2<br />
jnc cxeven<br />
&nbsp; movsb &nbsp; ;move 1 byte if odd<br />
cxeven:<br />
rep movsw &nbsp; ;move rest of bytes in words<br />
<br />
Or was the 80188 the 16 bit processor with the 8 bit mem access ? then stick with the original.
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To speed things up you might wanna replace movsb with movsw, especially for larger data blocks:

mov cx,[bp+12]
lds si,[bp+8]
les di,[bp+4]

shr cx,1   ;divide by 2
jnc cxeven
  movsb   ;move 1 byte if odd
cxeven:
rep movsw   ;move rest of bytes in words

Or was the 80188 the 16 bit processor with the 8 bit mem access ? then stick with the original.

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<br />
You'd better do a &quot;cld&quot; beforehand!<br />
<br />

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<div class="content wysiwyg-content">
Hi <br />
<br />
I need to write a &quot;memcpy&quot; procedure in assembly for an embedded system running on an 80188 microprocessor. Memcpy() copies n bytes from memory area s2 to s1 and returns s1. It is called in C code as follows: <br />
<br />
void *memcpy(void *s1, const void *s2, size_t n) <br />
<br />
I am very new to assembly programming and is hoping for some advice how this can be done. Btw, is there a compiler which translate C code into assembly? <br />
<br />
Any advice is very much appreciated. Thank you. <br />
<br />
Regards <br />
Wilson <br />

</div>
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Hi 

I need to write a "memcpy" procedure in assembly for an embedded system running on an 80188 microprocessor. Memcpy() copies n bytes from memory area s2 to s1 and returns s1. It is called in C code as follows: 

void *memcpy(void *s1, const void *s2, size_t n) 

I am very new to assembly programming and is hoping for some advice how this can be done. Btw, is there a compiler which translate C code into assembly? 

Any advice is very much appreciated. Thank you. 

Regards 
Wilson 


8086 Assembly : Memcpy procedure for 80188 embedded system

An assembly language (or assembler language) is a low-level programming language for a computer or other programmable device in which there is a very strong (generally one-to-one) correspondence between the language and the architecture's machine code instructions. Each assembly language is specific to a particular computer architecture, in contrast to most high-level programming languages, which are generally portable across multiple architectures, but require interpreting or compiling. Assembly language is converted into executable machine code by a utility program referred to as an assembler; the conversion process is referred to as assembly, or assembling the code.