------- Comment #4 from changpeng dot fang at amd dot com 2010-02-26 18:53 ------- Here is another similar case but more general. We know that a(j) and a(i) never access the same memory location. intel ifort can vectorize this triangular loop:
do 10 j = 1,n
do 20 i = j+1, n
a(i) = a(i) - aa(i,j) * a(j)
20 continue
10 continue
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43182
