------- Comment #5 from tehila at il dot ibm dot com 2008-08-26 20:47 ------- (In reply to comment #3) > The meaning here is to the second > for (j = 0; j < 4; j++) > loop. > It's loop #4 in cunrolli pass. > > cunrolli doesn't recognize # of iterations = 4. > > I think it doesn't recognize it starts from 0.
We think the problem is that j=0 are somewhere before got hoisted into some part above. If I add 'printf' before the loop (i.e., after the if) the loop does get unrolled and with SRA optimization the performance get improved. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37221
