------- Comment #43 from dorit at il dot ibm dot com 2006-08-07 20:35 ------- > I'm all for this. info gcc says that w/o a guarantee of alignment, loops are > duped, with an if selecting between vector and scalar loops, is this not > accurate?
yes >I spent a day trying to get gcc to vectorize any of the generator's > loops, and did not succeed (can you make it vectorize the provided benchmark > code?). The aggressive unrolling in the provided example seems to be the first obstacle to vectorize the code > I also tried various unrollings of the inner loop, particularly no > unrolling and unroll=2 (vector length). I was unable to truly decipher the > warning messages explaining the lack of vectorization, and I would truly > welcome some help in fixing this. I'd be happy to help decipher the vectorizer's dump file. please send the un-unrolled version and the dump file generated by -fdump-tree-vect-details, and I'll see if I can help. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27827
