Execution time problem (PIC)

[kappa_am]

I have written following code. it is simple and just consist of some bit check and bit set.
but execution time is rather high. I wonder why! for example in line 10 it takes 2 cycle to write a number to a variable. of if conditions consume about 10-15 step times.
I wonder why?, while I have not experienced such problem.
i also be grateful if you recommend a way to reduce execution time.

unsigned short CPS[3], PH, CH, DCH, CAPL[3], IPH[3],CAPL1, CPS1;
 signed short  LLO;
void main() {
for (PH=0; PH<3; PH++)
{
CPS[PH]=0;
CPS1=0;
CAPL1=CAPL[PH];
if(IPH[PH]) // add input current direction
{ CH=254;
 DCH=253;
}
else
{ CH= 253;
  DCH=254;
}
 if (CAPL1.B2)
 {
 CPS1 = CPS1 | ~DCH;
  }
 else
 {
  if (CAPL1.B5)
   {
    CPS1.B5=1;
    }
   else CPS1=CPS1 |~CH;
   }
for (LLO=1; LLO>-1; LLO--)
{
  if (CAPL1 & (1<<LLO))
  {
   if (CPS1.B0 == CH.B0)
   {
     if (CPS1.B4){
        CPS1.B4=0;
      CPS1=(CPS1<<1) | ~DCH;}
     else
     {
      CPS1=((CPS1<<1)+1) & CH;
      CPS1.B5=1;
      }
     }
     else CPS1=((CPS1<<1)+1) & CH;
     }
     else
     {
     if (CAPL1 & (1<<(LLO+3)))
     {
     CPS1=CPS1<<1;
     CPS1.B4= 1;
     }
     else
     {
     if (CPS1.B0=DCH.B0)
      {
      if (CPS1.B4){
         CPS1.B4=0;
         CPS1=CPS1<<1 | ~CH;}
         else
         {
         CPS1=((CPS1<<1)+1)| ~DCH;
         CPS1.B5=1;
         }} } } }
         CPS[PH]=CPS1;}
         
         }

P.s: I have not set registers yet. just a program in MikroC

 

[Easyrider83]

In MicroC you can check your assembly listing and find out how many cycles takes any of your routines.

 

[betwixt]

If you really need to control the execution time the only way is to write in assembly language. When you use high level languages you lose control of things like variable placement and stack control. I can't be specific without seeing your assembly code listing but for example, you might be switching banks to access some of your variables, the compiler will add code to do this automatically but it adds to the number of instructions the PIC has to execute to complete the instruction.

Brian.

 

[kappa_am]

Does Mikroc convert lst file to hex or it directly convert C to hex file?
I mean if I change some instruction in lst file, will it considered in HEX file generating?

Thank you

 

[milan.rajik]

mikroC will generate .lst file , .asm file, .cof file and also .hex file. Zip and post complete project files.

 

[FvM]

Everything is generated from C source, that's where you need to make your changes.

You can write inline assembly code (asm statements) to implement specific operations differently. I won't expect large speed improvements.

There's probably some optimzation potential in the arrangement of your data structures.