This patch adds a bunch of flags to dr_with_seg_len_pair_t,
for use by later patches. The update to tree-loop-distribution.c
is conservatively correct, but might be tweakable later.
2019-11-16 Richard Sandiford <richard.sandiford@arm.com>
gcc/
* tree-data-ref.h (DR_ALIAS_RAW, DR_ALIAS_WAR, DR_ALIAS_WAW)
(DR_ALIAS_ARBITRARY, DR_ALIAS_SWAPPED, DR_ALIAS_UNSWAPPED): New flags.
(dr_with_seg_len_pair_t::sequencing): New enum.
(dr_with_seg_len_pair_t::flags): New member variable.
(dr_with_seg_len_pair_t::dr_with_seg_len_pair_t): Take a sequencing
parameter and initialize the flags member variable.
* tree-loop-distribution.c (compute_alias_check_pairs): Update
call accordingly.
* tree-vect-data-refs.c (vect_prune_runtime_alias_test_list): Likewise.
Ensure the two data references in an alias pair are in statement
order, if there is a defined order.
* tree-data-ref.c (prune_runtime_alias_test_list): Use
DR_ALIAS_SWAPPED and DR_ALIAS_UNSWAPPED to record whether we've
swapped the references in a dr_with_seg_len_pair_t. OR together
the flags when merging two dr_with_seg_len_pair_ts. After merging,
try to restore the original dr_with_seg_len order, updating the
flags if that fails.
From-SVN: r278350
