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07c1c2fcc9
Polly uses 'prevectorization' to enable outer loop vectorization. When vectorizing an outer loop, we strip-mine <number-of-prevec-dims> loop iterations which are than interchanged to the innermost level such that LLVM's inner loop vectorizer (or Polly's simple vectorizer) can easily vectorize this loop. The number of loop iterations to strip-mine is now configurable with the option -polly-prevect-width=<number-of-prevec-dims>. This is mostly a debugging option. We should probably add a heuristic that derives the number of prevectorization dimensions from the target data and the data types used. llvm-svn: 245424
place tests here