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How can i use div.ud in compiled result?

 
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Kim Cheolho



Joined: 27 Nov 2013
Posts: 1

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How can i use div.ud in compiled result?
PostPosted: Wed Nov 27, 2013 3:56 pm     Reply with quote
Hi!

I need high speed division unsigned 32bit/16bit.
But compiler does't support div.ud command.
Only private code which take long long time.
So I made #asm code like below.
How can i use div.ud in compiled result like MyDiv code?
Code:

//////  sample code for dsPIC30F2011
//////  Compiler version is 5.016
unsigned int16 MyDiv(unsigned int32 i32, unsigned int16 i16)
{
   unsigned int16 hi,lo, rt;
   
   lo = (unsigned int16)i32;
   hi = (unsigned int16)(i32>>16);

#asm
   mov lo, w6;
   mov hi, w7;
   mov i16, w8;
   repeat #17;
   div.ud w6, w8;
   mov w0, rt;
#endasm
return rt;
}
void main()
{

unsigned int32 i32 = 691200;
unsigned int16 i16 = 500;
unsigned int16 result;

   while(TRUE)
   {
      result = i32 / i16;
      result = MyDiv(i32, i16);
   }

}
Very Happy

Last edited by Kim Cheolho on Thu Nov 28, 2013 6:07 pm; edited 1 time in total
Ttelmah



Joined: 11 Mar 2010
Posts: 19436

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PostPosted: Thu Nov 28, 2013 2:33 am     Reply with quote
You already are...

Nothing better at the moment, _but_ point out to CCS, that these chips have a hardware unsigned division, and hopefully they will consider adding it's use to their code.

Best Wishes
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