------- Comment #8 from irar at il dot ibm dot com 2009-01-25 12:17 ------- (In reply to comment #7) > > > Q1: does SLP work with reductions at all? > > > > No. SLP currently originates from groups of strided stores. > Ah, I see. In this loop we have two reductions, so to apply SLP > we would need to see that we can use a group of reductions for SLP?
Yes, I think this will work. > > > 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. > Ok, but with a reduction it won't help me here. > Can a loop be vectorized with just pattern recognition? Hm, if I > remember correctly we detect scalar patterns and then vectorize them. > We don't support detecting "vector patterns" from scalar code, correct? Yes, if I understand you correctly, we detect scalar patterns, but adding vector pattern detection does not seem to be complicated. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37021
