------- Comment #6 from irar at il dot ibm dot com 2009-01-25 09:12 ------- (In reply to comment #5) > So, > 4) The vectorized version sucks because we have to use peeling for niters > because we need to unroll the loop once and cannot apply SLP here.
What do you mean by "unroll the loop once"? > Q1: does SLP work with reductions at all? No. SLP currently originates from groups of strided stores. > Q2: does SLP do pattern recognition? Pattern recoginition is done before SLP, and SLP handles stmts that were marked as a part of a pattern. There is no SLP specific pattern recoginition. > First of all we would need to recognize a complex reduction as a single > vectorized reduction. Second we need to vectorize the complex multiplication > with SLP, feeding the reduction with one resulting complex vector. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37021
