https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #9 from Andrew Pinski ---
On the trunk, I see no loop at all for the original testcase at -O3.
At -O2 -ftree-vectorize, I do see the loop but when I add -funroll-loops, the
loop is completely unrolled at the gimple level.
So maybe th
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #8 from Ilya Enkovich 2011-08-15
09:06:18 UTC ---
This patch did not work for me. Tried on following loop (-O2 -funroll-loops):
for ( count = ((*(hdrptr)) & 0x7); count > 0; count--, addr++ )
sum += *addr;
No multiplication by
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #7 from Richard Guenther 2011-08-11
12:12:56 UTC ---
The following patch makes us handle the canonical testcase on the tree level,
but not yet the original testcase (because of the * 2).
We should really preserve value-range informat
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #6 from Richard Guenther 2011-08-11
11:39:44 UTC ---
It probably doesn't help that tree IVOPTs replaces the nice induction variable
with a pointer one:
# BLOCK 2 freq:900
# PRED: ENTRY [100.0%] (fallthru,exec)
count_5 = n_4(D)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #5 from Richard Guenther 2011-08-11
11:21:34 UTC ---
(In reply to comment #4)
> (In reply to comment #3)
> > Using
> >
> > int foo (int n, int *addr)
> > {
> > int count, sum;
> > for ( count = n & 0x3; count >= 0; count--, addr+
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
Michael Matz changed:
What|Removed |Added
CC||matz at gcc dot gnu.org
--- Comment #4 fro
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
Richard Guenther changed:
What|Removed |Added
CC||rakdver at gcc dot gnu.org
--- Comment
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
--- Comment #2 from Ilya Enkovich 2011-08-10
15:33:22 UTC ---
I wouldn't blame vectorizer here. Following loop is unrolled with unroll factor
8 even if vectorizer is disabled:
for ( count = ((*(hdrptr)) & 0x3) * 2; count > 0; count--, addr++ )
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50037
Richard Guenther changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed|
