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02/14/01 09:06
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 		 #9291 - RE: use of multiply in large data arrays
Peter,

MUL A,B will cost 24 instruction cycles with the hardware accelerator.
Beneath I have paste the assembler code generated by th compiler. As you see it takes a lot of time to just clear one byte of an member.

MOV B,#011H
MOV A,_47
MUL AB
MOV R2,A
ADD A,# LOW (_PCcommBuffer)
MOV DPL,A
CLR A
ADDC A,# HIGH (_PCcommBuffer)
MOV DPH,A
CLR A
MOVX @DPTR,A


Patrick

List of 30 messages in thread
TopicAuthorDate
use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
<types.h> invisible !            01/01/70 00:00      
RE: <types.h> invisible !            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
The FASTEST !            01/01/70 00:00      
RE: The FASTEST !            01/01/70 00:00      
Work the problem backwards            01/01/70 00:00      

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