}
-/* Function vect_insert_into_interleaving_chain.
-
- Insert DRA into the interleaving chain of DRB according to DRA's INIT. */
-
-static void
-vect_insert_into_interleaving_chain (struct data_reference *dra,
- struct data_reference *drb)
-{
- gimple prev, next;
- tree next_init;
- stmt_vec_info stmtinfo_a = vinfo_for_stmt (DR_STMT (dra));
- stmt_vec_info stmtinfo_b = vinfo_for_stmt (DR_STMT (drb));
-
- prev = GROUP_FIRST_ELEMENT (stmtinfo_b);
- next = GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev));
- while (next)
- {
- next_init = DR_INIT (STMT_VINFO_DATA_REF (vinfo_for_stmt (next)));
- if (tree_int_cst_compare (next_init, DR_INIT (dra)) > 0)
- {
- /* Insert here. */
- GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev)) = DR_STMT (dra);
- GROUP_NEXT_ELEMENT (stmtinfo_a) = next;
- return;
- }
- prev = next;
- next = GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev));
- }
-
- /* We got to the end of the list. Insert here. */
- GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev)) = DR_STMT (dra);
- GROUP_NEXT_ELEMENT (stmtinfo_a) = NULL;
-}
-
-
-/* Function vect_update_interleaving_chain.
-
- For two data-refs DRA and DRB that are a part of a chain interleaved data
- accesses, update the interleaving chain. DRB's INIT is smaller than DRA's.
-
- There are four possible cases:
- 1. New stmts - both DRA and DRB are not a part of any chain:
- FIRST_DR = DRB
- NEXT_DR (DRB) = DRA
- 2. DRB is a part of a chain and DRA is not:
- no need to update FIRST_DR
- no need to insert DRB
- insert DRA according to init
- 3. DRA is a part of a chain and DRB is not:
- if (init of FIRST_DR > init of DRB)
- FIRST_DR = DRB
- NEXT(FIRST_DR) = previous FIRST_DR
- else
- insert DRB according to its init
- 4. both DRA and DRB are in some interleaving chains:
- choose the chain with the smallest init of FIRST_DR
- insert the nodes of the second chain into the first one. */
-
-static void
-vect_update_interleaving_chain (struct data_reference *drb,
- struct data_reference *dra)
-{
- stmt_vec_info stmtinfo_a = vinfo_for_stmt (DR_STMT (dra));
- stmt_vec_info stmtinfo_b = vinfo_for_stmt (DR_STMT (drb));
- tree next_init, init_dra_chain, init_drb_chain;
- gimple first_a, first_b;
- tree node_init;
- gimple node, prev, next, first_stmt;
-
- /* 1. New stmts - both DRA and DRB are not a part of any chain. */
- if (!GROUP_FIRST_ELEMENT (stmtinfo_a) && !GROUP_FIRST_ELEMENT (stmtinfo_b))
- {
- GROUP_FIRST_ELEMENT (stmtinfo_a) = DR_STMT (drb);
- GROUP_FIRST_ELEMENT (stmtinfo_b) = DR_STMT (drb);
- GROUP_NEXT_ELEMENT (stmtinfo_b) = DR_STMT (dra);
- return;
- }
-
- /* 2. DRB is a part of a chain and DRA is not. */
- if (!GROUP_FIRST_ELEMENT (stmtinfo_a) && GROUP_FIRST_ELEMENT (stmtinfo_b))
- {
- GROUP_FIRST_ELEMENT (stmtinfo_a) = GROUP_FIRST_ELEMENT (stmtinfo_b);
- /* Insert DRA into the chain of DRB. */
- vect_insert_into_interleaving_chain (dra, drb);
- return;
- }
-
- /* 3. DRA is a part of a chain and DRB is not. */
- if (GROUP_FIRST_ELEMENT (stmtinfo_a) && !GROUP_FIRST_ELEMENT (stmtinfo_b))
- {
- gimple old_first_stmt = GROUP_FIRST_ELEMENT (stmtinfo_a);
- tree init_old = DR_INIT (STMT_VINFO_DATA_REF (vinfo_for_stmt (
- old_first_stmt)));
- gimple tmp;
-
- if (tree_int_cst_compare (init_old, DR_INIT (drb)) > 0)
- {
- /* DRB's init is smaller than the init of the stmt previously marked
- as the first stmt of the interleaving chain of DRA. Therefore, we
- update FIRST_STMT and put DRB in the head of the list. */
- GROUP_FIRST_ELEMENT (stmtinfo_b) = DR_STMT (drb);
- GROUP_NEXT_ELEMENT (stmtinfo_b) = old_first_stmt;
-
- /* Update all the stmts in the list to point to the new FIRST_STMT. */
- tmp = old_first_stmt;
- while (tmp)
- {
- GROUP_FIRST_ELEMENT (vinfo_for_stmt (tmp)) = DR_STMT (drb);
- tmp = GROUP_NEXT_ELEMENT (vinfo_for_stmt (tmp));
- }
- }
- else
- {
- /* Insert DRB in the list of DRA. */
- vect_insert_into_interleaving_chain (drb, dra);
- GROUP_FIRST_ELEMENT (stmtinfo_b) = GROUP_FIRST_ELEMENT (stmtinfo_a);
- }
- return;
- }
-
- /* 4. both DRA and DRB are in some interleaving chains. */
- first_a = GROUP_FIRST_ELEMENT (stmtinfo_a);
- first_b = GROUP_FIRST_ELEMENT (stmtinfo_b);
- if (first_a == first_b)
- return;
- init_dra_chain = DR_INIT (STMT_VINFO_DATA_REF (vinfo_for_stmt (first_a)));
- init_drb_chain = DR_INIT (STMT_VINFO_DATA_REF (vinfo_for_stmt (first_b)));
-
- if (tree_int_cst_compare (init_dra_chain, init_drb_chain) > 0)
- {
- /* Insert the nodes of DRA chain into the DRB chain.
- After inserting a node, continue from this node of the DRB chain (don't
- start from the beginning. */
- node = GROUP_FIRST_ELEMENT (stmtinfo_a);
- prev = GROUP_FIRST_ELEMENT (stmtinfo_b);
- first_stmt = first_b;
- }
- else
- {
- /* Insert the nodes of DRB chain into the DRA chain.
- After inserting a node, continue from this node of the DRA chain (don't
- start from the beginning. */
- node = GROUP_FIRST_ELEMENT (stmtinfo_b);
- prev = GROUP_FIRST_ELEMENT (stmtinfo_a);
- first_stmt = first_a;
- }
-
- while (node)
- {
- node_init = DR_INIT (STMT_VINFO_DATA_REF (vinfo_for_stmt (node)));
- next = GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev));
- while (next)
- {
- next_init = DR_INIT (STMT_VINFO_DATA_REF (vinfo_for_stmt (next)));
- if (tree_int_cst_compare (next_init, node_init) > 0)
- {
- /* Insert here. */
- GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev)) = node;
- GROUP_NEXT_ELEMENT (vinfo_for_stmt (node)) = next;
- prev = node;
- break;
- }
- prev = next;
- next = GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev));
- }
- if (!next)
- {
- /* We got to the end of the list. Insert here. */
- GROUP_NEXT_ELEMENT (vinfo_for_stmt (prev)) = node;
- GROUP_NEXT_ELEMENT (vinfo_for_stmt (node)) = NULL;
- prev = node;
- }
- GROUP_FIRST_ELEMENT (vinfo_for_stmt (node)) = first_stmt;
- node = GROUP_NEXT_ELEMENT (vinfo_for_stmt (node));
- }
-}
-
-/* Check dependence between DRA and DRB for basic block vectorization.
- If the accesses share same bases and offsets, we can compare their initial
- constant offsets to decide whether they differ or not. In case of a read-
- write dependence we check that the load is before the store to ensure that
- vectorization will not change the order of the accesses. */
-
-static bool
-vect_drs_dependent_in_basic_block (struct data_reference *dra,
- struct data_reference *drb)
-{
- HOST_WIDE_INT type_size_a, type_size_b, init_a, init_b;
- gimple earlier_stmt;
-
- /* We only call this function for pairs of loads and stores, but we verify
- it here. */
- if (DR_IS_READ (dra) == DR_IS_READ (drb))
- {
- if (DR_IS_READ (dra))
- return false;
- else
- return true;
- }
-
- /* Check that the data-refs have same bases and offsets. If not, we can't
- determine if they are dependent. */
- if (!operand_equal_p (DR_BASE_ADDRESS (dra), DR_BASE_ADDRESS (drb), 0)
- || !dr_equal_offsets_p (dra, drb))
- return true;
-
- /* Check the types. */
- type_size_a = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dra))));
- type_size_b = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (drb))));
-
- if (type_size_a != type_size_b
- || !types_compatible_p (TREE_TYPE (DR_REF (dra)),
- TREE_TYPE (DR_REF (drb))))
- return true;
-
- init_a = TREE_INT_CST_LOW (DR_INIT (dra));
- init_b = TREE_INT_CST_LOW (DR_INIT (drb));
-
- /* Two different locations - no dependence. */
- if (init_a != init_b)
- return false;
-
- /* We have a read-write dependence. Check that the load is before the store.
- When we vectorize basic blocks, vector load can be only before
- corresponding scalar load, and vector store can be only after its
- corresponding scalar store. So the order of the acceses is preserved in
- case the load is before the store. */
- earlier_stmt = get_earlier_stmt (DR_STMT (dra), DR_STMT (drb));
- if (DR_IS_READ (STMT_VINFO_DATA_REF (vinfo_for_stmt (earlier_stmt))))
- return false;
-
- return true;
-}
-
-
-/* Function vect_check_interleaving.
-
- Check if DRA and DRB are a part of interleaving. In case they are, insert
- DRA and DRB in an interleaving chain. */
-
-static bool
-vect_check_interleaving (struct data_reference *dra,
- struct data_reference *drb)
-{
- HOST_WIDE_INT type_size_a, type_size_b, diff_mod_size, step, init_a, init_b;
-
- /* Check that the data-refs have same first location (except init) and they
- are both either store or load (not load and store). */
- if (!operand_equal_p (DR_BASE_ADDRESS (dra), DR_BASE_ADDRESS (drb), 0)
- || !dr_equal_offsets_p (dra, drb)
- || !tree_int_cst_compare (DR_INIT (dra), DR_INIT (drb))
- || DR_IS_READ (dra) != DR_IS_READ (drb))
- return false;
-
- /* Check:
- 1. data-refs are of the same type
- 2. their steps are equal
- 3. the step (if greater than zero) is greater than the difference between
- data-refs' inits. */
- type_size_a = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dra))));
- type_size_b = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (drb))));
-
- if (type_size_a != type_size_b
- || tree_int_cst_compare (DR_STEP (dra), DR_STEP (drb))
- || !types_compatible_p (TREE_TYPE (DR_REF (dra)),
- TREE_TYPE (DR_REF (drb))))
- return false;
-
- init_a = TREE_INT_CST_LOW (DR_INIT (dra));
- init_b = TREE_INT_CST_LOW (DR_INIT (drb));
- step = TREE_INT_CST_LOW (DR_STEP (dra));
-
- if (init_a > init_b)
- {
- /* If init_a == init_b + the size of the type * k, we have an interleaving,
- and DRB is accessed before DRA. */
- diff_mod_size = (init_a - init_b) % type_size_a;
-
- if (step && (init_a - init_b) > step)
- return false;
-
- if (diff_mod_size == 0)
- {
- vect_update_interleaving_chain (drb, dra);
- if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_NOTE, vect_location,
- "Detected interleaving ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (dra));
- dump_printf (MSG_NOTE, " and ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (drb));
- }
- return true;
- }
- }
- else
- {
- /* If init_b == init_a + the size of the type * k, we have an
- interleaving, and DRA is accessed before DRB. */
- diff_mod_size = (init_b - init_a) % type_size_a;
-
- if (step && (init_b - init_a) > step)
- return false;
-
- if (diff_mod_size == 0)
- {
- vect_update_interleaving_chain (dra, drb);
- if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_NOTE, vect_location,
- "Detected interleaving ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (dra));
- dump_printf (MSG_NOTE, " and ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (drb));
- }
- return true;
- }
- }
-
- return false;
-}
-
/* Check if data references pointed by DR_I and DR_J are same or
belong to same interleaving group. Return FALSE if drs are
different, otherwise return TRUE. */
loop_vec_info loop_vinfo, int *max_vf)
{
unsigned int i;
- struct loop *loop = NULL;
+ struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
struct data_reference *dra = DDR_A (ddr);
struct data_reference *drb = DDR_B (ddr);
stmt_vec_info stmtinfo_a = vinfo_for_stmt (DR_STMT (dra));
lambda_vector dist_v;
unsigned int loop_depth;
- /* Don't bother to analyze statements marked as unvectorizable. */
+ /* In loop analysis all data references should be vectorizable. */
if (!STMT_VINFO_VECTORIZABLE (stmtinfo_a)
|| !STMT_VINFO_VECTORIZABLE (stmtinfo_b))
- return false;
+ gcc_unreachable ();
+ /* Independent data accesses. */
if (DDR_ARE_DEPENDENT (ddr) == chrec_known)
- {
- /* Independent data accesses. */
- vect_check_interleaving (dra, drb);
- return false;
- }
-
- if (loop_vinfo)
- loop = LOOP_VINFO_LOOP (loop_vinfo);
+ return false;
- if ((DR_IS_READ (dra) && DR_IS_READ (drb) && loop_vinfo) || dra == drb)
+ if (dra == drb
+ || (DR_IS_READ (dra) && DR_IS_READ (drb)))
return false;
+ /* Unknown data dependence. */
if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know)
{
- gimple earlier_stmt;
-
- if (loop_vinfo)
- {
- if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "versioning for alias required: "
- "can't determine dependence between ");
- dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM,
- DR_REF (dra));
- dump_printf (MSG_MISSED_OPTIMIZATION, " and ");
- dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM,
- DR_REF (drb));
- }
-
- /* Add to list of ddrs that need to be tested at run-time. */
- return !vect_mark_for_runtime_alias_test (ddr, loop_vinfo);
- }
-
- /* When vectorizing a basic block unknown depnedence can still mean
- grouped access. */
- if (vect_check_interleaving (dra, drb))
- return false;
-
- /* Read-read is OK (we need this check here, after checking for
- interleaving). */
- if (DR_IS_READ (dra) && DR_IS_READ (drb))
- return false;
-
- if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "can't determine dependence between ");
- dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM, DR_REF (dra));
- dump_printf (MSG_MISSED_OPTIMIZATION, " and ");
- dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM, DR_REF (drb));
- }
-
- /* We do not vectorize basic blocks with write-write dependencies. */
- if (DR_IS_WRITE (dra) && DR_IS_WRITE (drb))
- return true;
-
- /* Check that it's not a load-after-store dependence. */
- earlier_stmt = get_earlier_stmt (DR_STMT (dra), DR_STMT (drb));
- if (DR_IS_WRITE (STMT_VINFO_DATA_REF (vinfo_for_stmt (earlier_stmt))))
- return true;
-
- return false;
- }
-
- /* Versioning for alias is not yet supported for basic block SLP, and
- dependence distance is unapplicable, hence, in case of known data
- dependence, basic block vectorization is impossible for now. */
- if (!loop_vinfo)
- {
- if (dra != drb && vect_check_interleaving (dra, drb))
- return false;
-
if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_NOTE, vect_location,
- "determined dependence between ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (dra));
- dump_printf (MSG_NOTE, " and ");
- dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (drb));
- }
-
- /* Do not vectorize basic blcoks with write-write dependences. */
- if (DR_IS_WRITE (dra) && DR_IS_WRITE (drb))
- return true;
+ {
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "versioning for alias required: "
+ "can't determine dependence between ");
+ dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM,
+ DR_REF (dra));
+ dump_printf (MSG_MISSED_OPTIMIZATION, " and ");
+ dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM,
+ DR_REF (drb));
+ }
- /* Check if this dependence is allowed in basic block vectorization. */
- return vect_drs_dependent_in_basic_block (dra, drb);
+ /* Add to list of ddrs that need to be tested at run-time. */
+ return !vect_mark_for_runtime_alias_test (ddr, loop_vinfo);
}
- /* Loop-based vectorization and known data dependence. */
+ /* Known data dependence. */
if (DDR_NUM_DIST_VECTS (ddr) == 0)
{
if (dump_enabled_p ())
}
/* For interleaving, mark that there is a read-write dependency if
- necessary. We check before that one of the data-refs is store. */
+ necessary. We check before that one of the data-refs is store. */
if (DR_IS_READ (dra))
GROUP_READ_WRITE_DEPENDENCE (stmtinfo_a) = true;
else
the maximum vectorization factor the data dependences allow. */
bool
-vect_analyze_data_ref_dependences (loop_vec_info loop_vinfo,
- bb_vec_info bb_vinfo, int *max_vf)
+vect_analyze_data_ref_dependences (loop_vec_info loop_vinfo, int *max_vf)
{
unsigned int i;
- vec<ddr_p> ddrs = vNULL;
struct data_dependence_relation *ddr;
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location,
- "=== vect_analyze_dependences ===");
- if (loop_vinfo)
+ "=== vect_analyze_data_ref_dependences ===");
+
+ if (!compute_all_dependences (LOOP_VINFO_DATAREFS (loop_vinfo),
+ &LOOP_VINFO_DDRS (loop_vinfo),
+ LOOP_VINFO_LOOP_NEST (loop_vinfo), true))
+ return false;
+
+ FOR_EACH_VEC_ELT (LOOP_VINFO_DDRS (loop_vinfo), i, ddr)
+ if (vect_analyze_data_ref_dependence (ddr, loop_vinfo, max_vf))
+ return false;
+
+ return true;
+}
+
+
+/* Function vect_slp_analyze_data_ref_dependence.
+
+ Return TRUE if there (might) exist a dependence between a memory-reference
+ DRA and a memory-reference DRB. When versioning for alias may check a
+ dependence at run-time, return FALSE. Adjust *MAX_VF according to
+ the data dependence. */
+
+static bool
+vect_slp_analyze_data_ref_dependence (struct data_dependence_relation *ddr)
+{
+ struct data_reference *dra = DDR_A (ddr);
+ struct data_reference *drb = DDR_B (ddr);
+
+ /* We need to check dependences of statements marked as unvectorizable
+ as well, they still can prohibit vectorization. */
+
+ /* Independent data accesses. */
+ if (DDR_ARE_DEPENDENT (ddr) == chrec_known)
+ return false;
+
+ if (dra == drb)
+ return false;
+
+ /* Read-read is OK. */
+ if (DR_IS_READ (dra) && DR_IS_READ (drb))
+ return false;
+
+ /* Unknown data dependence. */
+ if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know)
{
- if (!compute_all_dependences (LOOP_VINFO_DATAREFS (loop_vinfo),
- &LOOP_VINFO_DDRS (loop_vinfo),
- LOOP_VINFO_LOOP_NEST (loop_vinfo), true))
- return false;
- ddrs = LOOP_VINFO_DDRS (loop_vinfo);
+ gimple earlier_stmt;
+
+ if (dump_enabled_p ())
+ {
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "can't determine dependence between ");
+ dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM, DR_REF (dra));
+ dump_printf (MSG_MISSED_OPTIMIZATION, " and ");
+ dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM, DR_REF (drb));
+ }
+
+ /* We do not vectorize basic blocks with write-write dependencies. */
+ if (DR_IS_WRITE (dra) && DR_IS_WRITE (drb))
+ return true;
+
+ /* Check that it's not a load-after-store dependence. */
+ earlier_stmt = get_earlier_stmt (DR_STMT (dra), DR_STMT (drb));
+ if (DR_IS_WRITE (STMT_VINFO_DATA_REF (vinfo_for_stmt (earlier_stmt))))
+ return true;
+
+ return false;
}
- else
+
+ if (dump_enabled_p ())
{
- if (!compute_all_dependences (BB_VINFO_DATAREFS (bb_vinfo),
- &BB_VINFO_DDRS (bb_vinfo),
- vNULL, true))
- return false;
- ddrs = BB_VINFO_DDRS (bb_vinfo);
+ dump_printf_loc (MSG_NOTE, vect_location,
+ "determined dependence between ");
+ dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (dra));
+ dump_printf (MSG_NOTE, " and ");
+ dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (drb));
}
- FOR_EACH_VEC_ELT (ddrs, i, ddr)
- if (vect_analyze_data_ref_dependence (ddr, loop_vinfo, max_vf))
+ /* Do not vectorize basic blocks with write-write dependences. */
+ if (DR_IS_WRITE (dra) && DR_IS_WRITE (drb))
+ return true;
+
+ /* Check dependence between DRA and DRB for basic block vectorization.
+ If the accesses share same bases and offsets, we can compare their initial
+ constant offsets to decide whether they differ or not. In case of a read-
+ write dependence we check that the load is before the store to ensure that
+ vectorization will not change the order of the accesses. */
+
+ HOST_WIDE_INT type_size_a, type_size_b, init_a, init_b;
+ gimple earlier_stmt;
+
+ /* Check that the data-refs have same bases and offsets. If not, we can't
+ determine if they are dependent. */
+ if (!operand_equal_p (DR_BASE_ADDRESS (dra), DR_BASE_ADDRESS (drb), 0)
+ || !dr_equal_offsets_p (dra, drb))
+ return true;
+
+ /* Check the types. */
+ type_size_a = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dra))));
+ type_size_b = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (drb))));
+
+ if (type_size_a != type_size_b
+ || !types_compatible_p (TREE_TYPE (DR_REF (dra)),
+ TREE_TYPE (DR_REF (drb))))
+ return true;
+
+ init_a = TREE_INT_CST_LOW (DR_INIT (dra));
+ init_b = TREE_INT_CST_LOW (DR_INIT (drb));
+
+ /* Two different locations - no dependence. */
+ if (init_a != init_b)
+ return false;
+
+ /* We have a read-write dependence. Check that the load is before the store.
+ When we vectorize basic blocks, vector load can be only before
+ corresponding scalar load, and vector store can be only after its
+ corresponding scalar store. So the order of the acceses is preserved in
+ case the load is before the store. */
+ earlier_stmt = get_earlier_stmt (DR_STMT (dra), DR_STMT (drb));
+ if (DR_IS_READ (STMT_VINFO_DATA_REF (vinfo_for_stmt (earlier_stmt))))
+ return false;
+
+ return true;
+}
+
+
+/* Function vect_analyze_data_ref_dependences.
+
+ Examine all the data references in the basic-block, and make sure there
+ do not exist any data dependences between them. Set *MAX_VF according to
+ the maximum vectorization factor the data dependences allow. */
+
+bool
+vect_slp_analyze_data_ref_dependences (bb_vec_info bb_vinfo)
+{
+ struct data_dependence_relation *ddr;
+ unsigned int i;
+
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_NOTE, vect_location,
+ "=== vect_slp_analyze_data_ref_dependences ===");
+
+ if (!compute_all_dependences (BB_VINFO_DATAREFS (bb_vinfo),
+ &BB_VINFO_DDRS (bb_vinfo),
+ vNULL, true))
+ return false;
+
+ FOR_EACH_VEC_ELT (BB_VINFO_DDRS (bb_vinfo), i, ddr)
+ if (vect_slp_analyze_data_ref_dependence (ddr))
return false;
return true;
return vect_analyze_group_access (dr);
}
+/* Compare two data-references DRA and DRB to group them into chunks
+ suitable for grouping. */
+
+static int
+dr_group_sort_cmp (const void *dra_, const void *drb_)
+{
+ data_reference_p dra = *(data_reference_p *)const_cast<void *>(dra_);
+ data_reference_p drb = *(data_reference_p *)const_cast<void *>(drb_);
+ hashval_t h1, h2;
+ int cmp;
+
+ /* Stabilize sort. */
+ if (dra == drb)
+ return 0;
+
+ /* Ordering of DRs according to base. */
+ if (!operand_equal_p (DR_BASE_ADDRESS (dra), DR_BASE_ADDRESS (drb), 0))
+ {
+ h1 = iterative_hash_expr (DR_BASE_ADDRESS (dra), 0);
+ h2 = iterative_hash_expr (DR_BASE_ADDRESS (drb), 0);
+ if (h1 != h2)
+ return h1 < h2 ? -1 : 1;
+ }
+
+ /* And according to DR_OFFSET. */
+ if (!dr_equal_offsets_p (dra, drb))
+ {
+ h1 = iterative_hash_expr (DR_OFFSET (dra), 0);
+ h2 = iterative_hash_expr (DR_OFFSET (drb), 0);
+ if (h1 != h2)
+ return h1 < h2 ? -1 : 1;
+ }
+
+ /* Put reads before writes. */
+ if (DR_IS_READ (dra) != DR_IS_READ (drb))
+ return DR_IS_READ (dra) ? -1 : 1;
+
+ /* Then sort after access size. */
+ if (!operand_equal_p (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dra))),
+ TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (drb))), 0))
+ {
+ h1 = iterative_hash_expr (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dra))), 0);
+ h2 = iterative_hash_expr (TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (drb))), 0);
+ if (h1 != h2)
+ return h1 < h2 ? -1 : 1;
+ }
+
+ /* And after step. */
+ if (!operand_equal_p (DR_STEP (dra), DR_STEP (drb), 0))
+ {
+ h1 = iterative_hash_expr (DR_STEP (dra), 0);
+ h2 = iterative_hash_expr (DR_STEP (drb), 0);
+ if (h1 != h2)
+ return h1 < h2 ? -1 : 1;
+ }
+
+ /* Then sort after DR_INIT. In case of identical DRs sort after stmt UID. */
+ cmp = tree_int_cst_compare (DR_INIT (dra), DR_INIT (drb));
+ if (cmp == 0)
+ return gimple_uid (DR_STMT (dra)) < gimple_uid (DR_STMT (drb)) ? -1 : 1;
+ return cmp;
+}
/* Function vect_analyze_data_ref_accesses.
else
datarefs = BB_VINFO_DATAREFS (bb_vinfo);
+ if (datarefs.is_empty ())
+ return true;
+
+ /* Sort the array of datarefs to make building the interleaving chains
+ linear. */
+ qsort (datarefs.address(), datarefs.length (),
+ sizeof (data_reference_p), dr_group_sort_cmp);
+
+ /* Build the interleaving chains. */
+ for (i = 0; i < datarefs.length () - 1;)
+ {
+ data_reference_p dra = datarefs[i];
+ stmt_vec_info stmtinfo_a = vinfo_for_stmt (DR_STMT (dra));
+ stmt_vec_info lastinfo = NULL;
+ for (i = i + 1; i < datarefs.length (); ++i)
+ {
+ data_reference_p drb = datarefs[i];
+ stmt_vec_info stmtinfo_b = vinfo_for_stmt (DR_STMT (drb));
+
+ /* ??? Imperfect sorting (non-compatible types, non-modulo
+ accesses, same accesses) can lead to a group to be artificially
+ split here as we don't just skip over those. If it really
+ matters we can push those to a worklist and re-iterate
+ over them. The we can just skip ahead to the next DR here. */
+
+ /* Check that the data-refs have same first location (except init)
+ and they are both either store or load (not load and store). */
+ if (DR_IS_READ (dra) != DR_IS_READ (drb)
+ || !operand_equal_p (DR_BASE_ADDRESS (dra),
+ DR_BASE_ADDRESS (drb), 0)
+ || !dr_equal_offsets_p (dra, drb))
+ break;
+
+ /* Check that the data-refs have the same constant size and step. */
+ tree sza = TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (dra)));
+ tree szb = TYPE_SIZE_UNIT (TREE_TYPE (DR_REF (drb)));
+ if (!host_integerp (sza, 1)
+ || !host_integerp (szb, 1)
+ || !tree_int_cst_equal (sza, szb)
+ || !host_integerp (DR_STEP (dra), 0)
+ || !host_integerp (DR_STEP (drb), 0)
+ || !tree_int_cst_equal (DR_STEP (dra), DR_STEP (drb)))
+ break;
+
+ /* Do not place the same access in the interleaving chain twice. */
+ if (tree_int_cst_compare (DR_INIT (dra), DR_INIT (drb)) == 0)
+ break;
+
+ /* Check the types are compatible.
+ ??? We don't distinguish this during sorting. */
+ if (!types_compatible_p (TREE_TYPE (DR_REF (dra)),
+ TREE_TYPE (DR_REF (drb))))
+ break;
+
+ /* Sorting has ensured that DR_INIT (dra) <= DR_INIT (drb). */
+ HOST_WIDE_INT init_a = TREE_INT_CST_LOW (DR_INIT (dra));
+ HOST_WIDE_INT init_b = TREE_INT_CST_LOW (DR_INIT (drb));
+ gcc_assert (init_a < init_b);
+
+ /* If init_b == init_a + the size of the type * k, we have an
+ interleaving, and DRA is accessed before DRB. */
+ HOST_WIDE_INT type_size_a = TREE_INT_CST_LOW (sza);
+ if ((init_b - init_a) % type_size_a != 0)
+ break;
+
+ /* The step (if not zero) is greater than the difference between
+ data-refs' inits. This splits groups into suitable sizes. */
+ HOST_WIDE_INT step = TREE_INT_CST_LOW (DR_STEP (dra));
+ if (step != 0 && step <= (init_b - init_a))
+ break;
+
+ if (dump_enabled_p ())
+ {
+ dump_printf_loc (MSG_NOTE, vect_location,
+ "Detected interleaving ");
+ dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (dra));
+ dump_printf (MSG_NOTE, " and ");
+ dump_generic_expr (MSG_NOTE, TDF_SLIM, DR_REF (drb));
+ }
+
+ /* Link the found element into the group list. */
+ if (!GROUP_FIRST_ELEMENT (stmtinfo_a))
+ {
+ GROUP_FIRST_ELEMENT (stmtinfo_a) = DR_STMT (dra);
+ lastinfo = stmtinfo_a;
+ }
+ GROUP_FIRST_ELEMENT (stmtinfo_b) = DR_STMT (dra);
+ GROUP_NEXT_ELEMENT (lastinfo) = DR_STMT (drb);
+ lastinfo = stmtinfo_b;
+ }
+ }
+
FOR_EACH_VEC_ELT (datarefs, i, dr)
if (STMT_VINFO_VECTORIZABLE (vinfo_for_stmt (DR_STMT (dr)))
&& !vect_analyze_data_ref_access (dr))
projects / platform / upstream / linaro-gcc.git / commitdiff