From a6ec2cc24aeeebf60d1ca4e5a30981a6f31b9e46 Mon Sep 17 00:00:00 2001
From: amker <amker@amker-laptop.(none)>
Date: Mon, 29 May 2017 21:05:29 +0800
Subject: [PATCH 1/5] runtime-alias-check-interface-20170525.txt
---
gcc/tree-data-ref.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++
gcc/tree-data-ref.h | 1 +
gcc/tree-vect-data-refs.c | 42 +++-------------------------------------
3 files changed, 53 insertions(+), 39 deletions(-)
@@ -1182,6 +1182,55 @@ data_ref_compare_tree (tree t1, tree t2)
return 0;
}
+/* Return TRUE it's possible to resolve data dependence DDR by runtime alias
+ check. */
+
+bool
+runtime_alias_check_p (ddr_p ddr, struct loop *loop, bool speed_p)
+{
+ if (dump_enabled_p ())
+ {
+ dump_printf (MSG_NOTE, "consider run-time aliasing test between ");
+ dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (DDR_A (ddr)));
+ dump_printf (MSG_NOTE, " and ");
+ dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (DDR_B (ddr)));
+ dump_printf (MSG_NOTE, "\n");
+ }
+
+ if (!speed_p)
+ {
+ if (dump_enabled_p ())
+ dump_printf (MSG_MISSED_OPTIMIZATION,
+ "runtime alias check not supported when optimizing "
+ "for size.\n");
+ return false;
+ }
+
+ /* FORNOW: We don't support versioning with outer-loop in either
+ vectorization or loop distribution. */
+ if (loop != NULL && loop->inner != NULL)
+ {
+ if (dump_enabled_p ())
+ dump_printf (MSG_MISSED_OPTIMIZATION,
+ "runtime alias check not supported for outer loop.\n");
+ return false;
+ }
+
+ /* FORNOW: We don't support creating runtime alias tests for non-constant
+ step. */
+ if (TREE_CODE (DR_STEP (DDR_A (ddr))) != INTEGER_CST
+ || TREE_CODE (DR_STEP (DDR_B (ddr))) != INTEGER_CST)
+ {
+ if (dump_enabled_p ())
+ dump_printf (MSG_MISSED_OPTIMIZATION,
+ "runtime alias check not supported for non-constant "
+ "step\n");
+ return false;
+ }
+
+ return true;
+}
+
/* Operator == between two dr_with_seg_len objects.
This equality operator is used to make sure two data refs
@@ -368,6 +368,7 @@ extern bool dr_may_alias_p (const struct data_reference *,
extern bool dr_equal_offsets_p (struct data_reference *,
struct data_reference *);
+extern bool runtime_alias_check_p (ddr_p, struct loop *, bool);
extern int data_ref_compare_tree (tree, tree);
extern void prune_runtime_alias_test_list (vec<dr_with_seg_len_pair_t> *,
unsigned HOST_WIDE_INT);
@@ -150,45 +150,9 @@ vect_mark_for_runtime_alias_test (ddr_p ddr, loop_vec_info loop_vinfo)
if ((unsigned) PARAM_VALUE (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS) == 0)
return false;
- if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_NOTE, vect_location,
- "mark for run-time aliasing test between ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (DDR_A (ddr)));
- dump_printf (MSG_NOTE, " and ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (DDR_B (ddr)));
- dump_printf (MSG_NOTE, "\n");
- }
-
- if (optimize_loop_nest_for_size_p (loop))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "versioning not supported when optimizing"
- " for size.\n");
- return false;
- }
-
- /* FORNOW: We don't support versioning with outer-loop vectorization. */
- if (loop->inner)
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "versioning not yet supported for outer-loops.\n");
- return false;
- }
-
- /* FORNOW: We don't support creating runtime alias tests for non-constant
- step. */
- if (TREE_CODE (DR_STEP (DDR_A (ddr))) != INTEGER_CST
- || TREE_CODE (DR_STEP (DDR_B (ddr))) != INTEGER_CST)
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "versioning not yet supported for non-constant "
- "step\n");
- return false;
- }
+ if (!runtime_alias_check_p (ddr, loop,
+ optimize_loop_nest_for_speed_p (loop)))
+ return false;
LOOP_VINFO_MAY_ALIAS_DDRS (loop_vinfo).safe_push (ddr);
return true;
--
1.9.1