[cfe-dev] Loop optimised into div (?)

[Joan Lluch via cfe-dev]

Hi all,

For the following code 

int countHundred( int num )
{
  int count = 0;
  while ( num >= 100) { count++ ; num = num - 100; }
  return count;
}

the loop shown above is optimised away and replaced by ‘udiv’ instruction. 

This is undesirable for targets requiring libcalls for integer divisions, such as the MSP430. 

Where does that happen? Is there a way, to prevent this?

Thanks

John.


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