On Thu, May 25, 2017 at 5:16 PM, Bin.Cheng <amker.ch...@gmail.com> wrote:
> On Tue, May 23, 2017 at 5:23 PM, Bin Cheng <bin.ch...@arm.com> wrote:
>> Hi,
>> As commented in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80815#c1,
>> We can relax minimal segment length of DR_B for merging. With this change,
>> the new test can be improved to only one alias check. Note the
>> condition is still accurate after this patch, it won't introduce false
>> alias.
>> Bootstrap and test on x86_64 and AArch64, is it OK?
> Updated patch wrto change of previous patch.
>
> Bootstrap and test on x86_64 and AArch64.
Please omit unnecessary braces. Ok with that change.
Note that
if (tree_fits_uhwi_p (dr_b1->seg_len))
{
min_seg_len_b = dr_b1->seg_len;
if (tree_int_cst_sign_bit (dr_b1->seg_len))
min_seg_len_b = wi::neg (min_seg_len_b);
the tree_fits_uhwi_p check is somewhat bogus now that min_seg_len_b is
a wide-int.
It should probably be changed to TREE_CODE (dr_b1->seg_len) == INTEGER_CST
which also means that
min_seg_len_b = wi::abs (dr_b1->seg_len);
should work.
Richard.
> Thanks,
> bin
>>
>> 2017-05-22 Bin Cheng <bin.ch...@arm.com>
>>
>> * tree-data-ref.c (prune_runtime_alias_test_list): Relax minimal
>> segment length for dr_b.
>>
>> gcc/testsuite/ChangeLog
>> 2017-05-22 Bin Cheng <bin.ch...@arm.com>
>>
>> * gcc.dg/vect/pr80815-3.c: New test.
