FACTOID # 32: Guatamalan women work 11.5 hours a day, while South African men work only 4.5.
 
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Encyclopedia > Loop unrolling
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  Results from FactBites:
 
Loop nest optimization - Wikipedia, the free encyclopedia (1619 words)
Loop nest optimization (LNO) is a special case of loop transformation which deals with nested loops that makes possible large reductions in the cache bandwidth necessary for some pervasive algorithms.
The loop requires registers to hold both the accumulators and the loaded and reused A and B values.
That trick is reducing the size of the stripe of the B matrix by blocking the k loop, so that the stripe is of size ib x kb.
Real World Technologies - Compilers - Code Optimization (850 words)
Unrolling means copying out the body of the loop several times and changing the loop index correspondingly.
More often it is variable, if so another loop must follow the unrolled loop to take account of the possibility that the range ends on an odd number (or more generally a number not divisible by the number of unrolls).
Loop fission is a partial solution if it is possible the loop is split into two loops, one containing the dependence and the other containing the rest of the work of the loop, this second loop can be optimized well.
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