Note on dependency depth: Dependency depth is defined as the number of dependent instructions that need to execute sequentially.
Consider this example:

for (i=0; i<1000; i++)
   result[i] = sqrtf(arrayOne[i]) + sqrtf(arrayTwo[i]);
In each iteration of the outermost loop, there exists a chain of dependent instructions that need to execute sequentially. These are:
  1. Compute the address of arrayOne[i].
  2. Load arrayOne[i].
  3. Compute sqrtf(arrayOne[i]).
  4. Add sqrtf(arrayOne[i]) to sqrtf(arrayTwo[i]).
  5. Store the result at result[i].
The address computation for result[i] & the computation of sqrtf(arrayTwo[i]) can execute in parallel with the computations listed above.
Therefore, this region has a dependency depth of about 5.

ilp32
This feature is a measure of the Instruction Level Parallelism available in a region of code. ilp32 looks at the number of independent iterations of a loop that fit in a window of 32 instructions.

Classifying ilp32:
ilp32 can be classified into low, medium or high as follows: For a loop with < 32 instructions in each iteration,
BucketCondition
Low The number of operations in each iteration of the loop is <6
OR
The dependency depth is more than 10.
Medium The number of operations in each iteration of the outermost loop is >=6 & <=10 & the dependency depth is about 5.
OR
The dependency depth is between 5 & 10.
High The number of operations in each iteration of the outermost loop is >10 & the dependency depth is about 5.

Example 1:
Consider the following code:

for (i=0; i<1000; i++)
   result[i] = sqrtf(arrayOne[i]) + sqrtf(arrayTwo[i]);
The number of operations in this loop is about 12.
However, there are 5 instructions in each iteration that need to execute sequentially. They are:
  1. Adding the offset i to the base address of arrayOne.
  2. Loading the data from the address.
  3. computing the square root.
  4. Adding the result to sqrtf(arrayTwo[i]).
  5. Storing the result at result[i].
Therefore, ilp32 can be estimated to be medium.

Example 2:
Consider another example:

for (i=0; i<1000; i++){
    for (j=0; j<50; j++){
        var1 += arrayOne[i]*smallArray[j];
    }
    result[i] = var1;
}
The number of operations in each iteration of the innermost loop is about 5. Therefore, the total number of operations due to the innermost loop is:
(no of operations) * (no of iterations) = 5 * 50 = 250.
However, the value of var1 depends on the result of each iteration of the inner loop, forming a chain of at least 50 dependent instructions.
As the dependnecy depth is significantly greater than 10, ilp32 can be estimated to be low.