4 Replies Latest reply on Feb 16, 2011 2:05 PM by MicahVillmow

    pragma unroll

    rick.weber

      I have an array that is always small, but whose size isn't known until after preprocessor evaluation. How can I fully unroll all loops that access this array without resorting to code generators (which I'm considering adding to clUtil as a pre-preprocessor)? Also, if the compiler is able to compute indices at compile time, will this array reside in registers?

      E.g.

      #define arraySize 4

      __kernel void foo()

      {

        unsigned int array[arraySize]; //Want to be in registers

      #pragma unroll arraySize

        for(unsigned int i = 0; i < arraySize; i++)

        {

          //do something with array;

        }

      This code is equivilent to 

      __kernel void foo()

      {

        unsigned int array1;

        unsigned int array2;

        unsigned int array3;

        unsigned int array4;

        //do something with array1, 2, 3, 4