(In reply to comment #17)
> This looks like an unrelated problem - the vectorizer does not perform loop
> peeling here so it's not an issue of natural alignment. Lets open a separate
> PR
> for this one, unless there's already one open. In the meantime, would you
> please try this patch?:
>
> Index: tree-vectorizer.c
> ===================================================================
> *** tree-vectorizer.c (revision 126902)
> --- tree-vectorizer.c (working copy)
> *************** vect_can_force_dr_alignment_p (tree decl
> *** 1527,1533 ****
> PREFERRED_STACK_BOUNDARY is honored by all translation units.
> However, until someone implements forced stack alignment, SSE
> isn't really usable without this. */
> ! return (alignment <= PREFERRED_STACK_BOUNDARY);
> }
>
>
> --- 1527,1533 ----
> PREFERRED_STACK_BOUNDARY is honored by all translation units.
> However, until someone implements forced stack alignment, SSE
> isn't really usable without this. */
> ! return (alignment <= STACK_BOUNDARY);
> }
>
Hey Dorit. With this patch zlib appears to compile successfully. The loop is
vectorized with an "alignment of access forced using peeling" note and linked
apps no longer segfault.
I also tested using Andrew's patch from bug #16660 and always returning true in
vect_can_force_dr_alignment_p but it does not fix this error.
Let me know if I can provide any other info that would be useful to you.
--
Summary: zlib segfault in inflate_table() compiled w/ -O -msse2
ftree-vectorize
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dirtyepic at gentoo dot org
GCC build triplet: i686-linux-gnu
GCC host triplet: i686-linux-gnu
GCC target triplet: i686-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32893
