Basic Examples With Poorly Drawn Diagrams

Floating Point Adder

Here is the PipelineC code that describes a pipelined floating point adder:

float main(float x, float y)
{
   return x + y;
}

Binary Adder Tree

Here is the PipelineC code that describes a pipelined binary tree summation of 8 values by instantiating 7 floating point adders:

float main(float x0, float x1, float x2, float x3,
           float x4, float x5, float x6, float x7)
{
   // First layer of 4 sums in parallel
   float sum0;
   float sum1;
   float sum2;
   float sum3;
   sum0 = x0 + x1;
   sum1 = x2 + x3;
   sum2 = x4 + x5;
   sum3 = x6 + x7;
   
   // Next layer of two sums in parallel
   float sum4;
   float sum5;
   sum4 = sum0 + sum1;
   sum5 = sum2 + sum3;
   
   // Final layer of a single sum
   float sum6;
   sum6 = sum4 + sum5;
   
   return sum6;
}