On Tue, May 17, 2016 at 1:56 PM, Kumar, Venkataramanan
<venkataramanan.ku...@amd.com> wrote:
> Hi Richard,
>
> I created the patch by passing -b option to git. Now the patch is more
> readable.
>
> As per your suggestion I tried to fix the PR by splitting the SLP store group
> at vector boundary after the SLP tree is built.
>
> Boot strap PASSED on x86_64.
> Checked the patch with check_GNU_style.sh.
>
> The gfortran.dg/pr46519-1.f test now does SLP vectorization. Hence it
> generated 2 more vzeroupper.
> As recommended I adjusted the test case by adding -fno-tree-slp-vectorize to
> make it as expected after loop vectorization.
>
> The following tests are now passing.
>
> ------ Snip-----
> Tests that now work, but didn't before:
>
> gcc.dg/vect/bb-slp-19.c -flto -ffat-lto-objects scan-tree-dump-times slp2
> "basic block vectorized" 1
>
> gcc.dg/vect/bb-slp-19.c scan-tree-dump-times slp2 "basic block vectorized" 1
>
> New tests that PASS:
>
> gcc.dg/vect/pr58135.c (test for excess errors) gcc.dg/vect/pr58135.c -flto
> -ffat-lto-objects (test for excess errors)
>
> ------ Snip-----
>
> ChangeLog
>
> 2016-05-14 Venkataramanan Kumar <venkataramanan.ku...@amd.com>
> PR tree-optimization/58135
> * tree-vect-slp.c: When group size is not multiple of vector size,
> allow splitting of store group at vector boundary.
>
> Test suite ChangeLog
> 2016-05-14 Venkataramanan Kumar <venkataramanan.ku...@amd.com>
> * gcc.dg/vect/bb-slp-19.c: Remove XFAIL.
> * gcc.dg/vect/pr58135.c: Add new.
> * gfortran.dg/pr46519-1.f: Adjust test case.
>
> The attached patch Ok for trunk?
Please avoid the excessive vertical space around the vect_build_slp_tree call.
+ /* Calculate the unrolling factor. */
+ unrolling_factor = least_common_multiple
+ (nunits, group_size) / group_size;
...
+ else
{
/* Calculate the unrolling factor based on the smallest type. */
if (max_nunits > nunits)
- unrolling_factor = least_common_multiple (max_nunits, group_size)
- / group_size;
+ unrolling_factor
+ = least_common_multiple (max_nunits, group_size)/group_size;
please compute the "correct" unroll factor immediately and move the
"unrolling of BB required" error into the if() case by post-poning the
nunits < group_size check (and use max_nunits here).
+ if (is_a <bb_vec_info> (vinfo)
+ && nunits < group_size
+ && unrolling_factor != 1
+ && is_a <bb_vec_info> (vinfo))
+ {
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "Build SLP failed: store group "
+ "size not a multiple of the vector size "
+ "in basic block SLP\n");
+ /* Fatal mismatch. */
+ matches[nunits] = false;
this is too pessimistic - you want to add the extra 'false' at
group_size / max_nunits * max_nunits.
It looks like you leak 'node' in the if () path as well. You need
vect_free_slp_tree (node);
loads.release ();
thus treat it as a failure case.
Thanks,
Richard.
> Regards,
> Venkat.
>
