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Wed, 10 Jan 2024 23:42:45 +0000 From: Feng Xue OS To: Richard Biener , "gcc-patches@gcc.gnu.org" Subject: PING: [PATCH] Do not count unused scalar use when marking STMT_VINFO_LIVE_P [PR113091] Thread-Topic: PING: [PATCH] Do not count unused scalar use when marking STMT_VINFO_LIVE_P [PR113091] Thread-Index: AQHaOj+7eU2CkybyGEufZnkwsqWdb7DTyKAR Date: Wed, 10 Jan 2024 23:42:45 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_5b82cb1d-c2e0-4643-920a-bbe7b2d7cc47_Enabled=True; MSIP_Label_5b82cb1d-c2e0-4643-920a-bbe7b2d7cc47_SiteId=3bc2b170-fd94-476d-b0ce-4229bdc904a7; MSIP_Label_5b82cb1d-c2e0-4643-920a-bbe7b2d7cc47_SetDate=2024-01-10T23:42:45.010Z; MSIP_Label_5b82cb1d-c2e0-4643-920a-bbe7b2d7cc47_Name=Confidential; MSIP_Label_5b82cb1d-c2e0-4643-920a-bbe7b2d7cc47_ContentBits=0; MSIP_Label_5b82cb1d-c2e0-4643-920a-bbe7b2d7cc47_Method=Standard; authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=os.amperecomputing.com; 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Thanks, Feng diff --git a/gcc/testsuite/gcc.target/aarch64/bb-slp-pr113091.c b/gcc/testsuite/gcc.target/aarch64/bb-slp-pr113091.c new file mode 100644 index 00000000000..ff822e90b4a --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/bb-slp-pr113091.c @@ -0,0 +1,22 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-O3 -fdump-tree-slp-details -ftree-slp-vectorize" } */ + +int test(unsigned array[8]); + +int foo(char *a, char *b) +{ + unsigned array[8]; + + array[0] = (a[0] - b[0]); + array[1] = (a[1] - b[1]); + array[2] = (a[2] - b[2]); + array[3] = (a[3] - b[3]); + array[4] = (a[4] - b[4]); + array[5] = (a[5] - b[5]); + array[6] = (a[6] - b[6]); + array[7] = (a[7] - b[7]); + + return test(array); +} + +/* { dg-final { scan-tree-dump-times "Basic block will be vectorized using SLP" 1 "slp2" } } */ diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc index a82fca45161..d36ff37114e 100644 --- a/gcc/tree-vect-slp.cc +++ b/gcc/tree-vect-slp.cc @@ -6418,6 +6418,84 @@ vect_slp_analyze_node_operations (vec_info *vinfo, slp_tree node, return res; } +/* Given a definition DEF, analyze if it will have any live scalar use after + performing SLP vectorization whose information is represented by BB_VINFO, + and record result into hash map SCALAR_USE_MAP as cache for later fast + check. */ + +static bool +vec_slp_has_scalar_use (bb_vec_info bb_vinfo, tree def, + hash_map &scalar_use_map) +{ + imm_use_iterator use_iter; + gimple *use_stmt; + + if (bool *res = scalar_use_map.get (def)) + return *res; + + FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, def) + { + if (is_gimple_debug (use_stmt)) + continue; + + stmt_vec_info use_stmt_info = bb_vinfo->lookup_stmt (use_stmt); + + if (!use_stmt_info) + break; + + if (PURE_SLP_STMT (vect_stmt_to_vectorize (use_stmt_info))) + continue; + + /* Do not step forward when encounter PHI statement, since it may + involve cyclic reference and cause infinite recursive invocation. */ + if (gimple_code (use_stmt) == GIMPLE_PHI) + break; + + /* When pattern recognition is involved, a statement whose definition is + consumed in some pattern, may not be included in the final replacement + pattern statements, so would be skipped when building SLP graph. + + * Original + char a_c = *(char *) a; + char b_c = *(char *) b; + unsigned short a_s = (unsigned short) a_c; + int a_i = (int) a_s; + int b_i = (int) b_c; + int r_i = a_i - b_i; + + * After pattern replacement + a_s = (unsigned short) a_c; + a_i = (int) a_s; + + patt_b_s = (unsigned short) b_c; // b_i = (int) b_c + patt_b_i = (int) patt_b_s; // b_i = (int) b_c + + patt_r_s = widen_minus(a_c, b_c); // r_i = a_i - b_i + patt_r_i = (int) patt_r_s; // r_i = a_i - b_i + + The definitions of a_i(original statement) and b_i(pattern statement) + are related to, but actually not part of widen_minus pattern. + Vectorizing the pattern does not cause these definition statements to + be marked as PURE_SLP. For this case, we need to recursively check + whether their uses are all absorbed into vectorized code. But there + is an exception that some use may participate in an vectorized + operation via an external SLP node containing that use as an element. + The parameter "scalar_use_map" tags such kind of SSA as having scalar + use in advance. */ + tree lhs = gimple_get_lhs (use_stmt); + + if (!lhs || TREE_CODE (lhs) != SSA_NAME + || vec_slp_has_scalar_use (bb_vinfo, lhs, scalar_use_map)) + break; + } + + bool found = !end_imm_use_stmt_p (&use_iter); + bool added = scalar_use_map.put (def, found); + + gcc_assert (!added); + return found; +} + /* Mark lanes of NODE that are live outside of the basic-block vectorized region and that can be vectorized using vectorizable_live_operation with STMT_VINFO_LIVE_P. Not handled live operations will cause the @@ -6427,6 +6505,7 @@ static void vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node, slp_instance instance, stmt_vector_for_cost *cost_vec, + hash_map &scalar_use_map, hash_set &svisited, hash_set &visited) { @@ -6451,32 +6530,22 @@ vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node, def_operand_p def_p; FOR_EACH_PHI_OR_STMT_DEF (def_p, orig_stmt, op_iter, SSA_OP_DEF) { - imm_use_iterator use_iter; - gimple *use_stmt; - stmt_vec_info use_stmt_info; - FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, DEF_FROM_PTR (def_p)) - if (!is_gimple_debug (use_stmt)) - { - use_stmt_info = bb_vinfo->lookup_stmt (use_stmt); - if (!use_stmt_info - || !PURE_SLP_STMT (vect_stmt_to_vectorize (use_stmt_info))) - { - STMT_VINFO_LIVE_P (stmt_info) = true; - if (vectorizable_live_operation (bb_vinfo, stmt_info, - node, instance, i, - false, cost_vec)) - /* ??? So we know we can vectorize the live stmt - from one SLP node. If we cannot do so from all - or none consistently we'd have to record which - SLP node (and lane) we want to use for the live - operation. So make sure we can code-generate - from all nodes. */ - mark_visited = false; - else - STMT_VINFO_LIVE_P (stmt_info) = false; - break; - } - } + if (vec_slp_has_scalar_use (bb_vinfo, DEF_FROM_PTR (def_p), + scalar_use_map)) + { + STMT_VINFO_LIVE_P (stmt_info) = true; + if (vectorizable_live_operation (bb_vinfo, stmt_info, node, + instance, i, false, cost_vec)) + /* ??? So we know we can vectorize the live stmt from one SLP + node. If we cannot do so from all or none consistently + we'd have to record which SLP node (and lane) we want to + use for the live operation. So make sure we can + code-generate from all nodes. */ + mark_visited = false; + else + STMT_VINFO_LIVE_P (stmt_info) = false; + } + /* We have to verify whether we can insert the lane extract before all uses. The following is a conservative approximation. We cannot put this into vectorizable_live_operation because @@ -6495,6 +6564,10 @@ vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node, from the latest stmt in a node. So we compensate for this during code-generation, simply not replacing uses for those hopefully rare cases. */ + imm_use_iterator use_iter; + gimple *use_stmt; + stmt_vec_info use_stmt_info; + if (STMT_VINFO_LIVE_P (stmt_info)) FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, DEF_FROM_PTR (def_p)) if (!is_gimple_debug (use_stmt) @@ -6517,8 +6590,56 @@ vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node, slp_tree child; FOR_EACH_VEC_ELT (SLP_TREE_CHILDREN (node), i, child) if (child && SLP_TREE_DEF_TYPE (child) == vect_internal_def) - vect_bb_slp_mark_live_stmts (bb_vinfo, child, instance, - cost_vec, svisited, visited); + vect_bb_slp_mark_live_stmts (bb_vinfo, child, instance, cost_vec, + scalar_use_map, svisited, visited); +} + +/* Traverse all slp instances of BB_VINFO, and mark lanes of every node that + are live outside of the basic-block vectorized region and that can be + vectorized using vectorizable_live_operation with STMT_VINFO_LIVE_P. */ + +static void +vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo) +{ + if (bb_vinfo->slp_instances.is_empty ()) + return; + + hash_set svisited; + hash_set visited; + hash_map scalar_use_map; + auto_vec worklist; + + for (slp_instance instance : bb_vinfo->slp_instances) + if (!visited.add (SLP_INSTANCE_TREE (instance))) + worklist.safe_push (SLP_INSTANCE_TREE (instance)); + + do + { + slp_tree node = worklist.pop (); + + if (SLP_TREE_DEF_TYPE (node) == vect_external_def) + { + for (tree op : SLP_TREE_SCALAR_OPS (node)) + if (TREE_CODE (op) == SSA_NAME) + scalar_use_map.put (op, true); + } + else + { + for (slp_tree child : SLP_TREE_CHILDREN (node)) + if (child && !visited.add (child)) + worklist.safe_push (child); + } + } while (!worklist.is_empty ()); + + visited.empty (); + + for (slp_instance instance : bb_vinfo->slp_instances) + { + vect_location = instance->location (); + vect_bb_slp_mark_live_stmts (bb_vinfo, SLP_INSTANCE_TREE (instance), + instance, &instance->cost_vec, + scalar_use_map, svisited, visited); + } } /* Determine whether we can vectorize the reduction epilogue for INSTANCE. */ @@ -6684,17 +6805,7 @@ vect_slp_analyze_operations (vec_info *vinfo) /* Compute vectorizable live stmts. */ if (bb_vec_info bb_vinfo = dyn_cast (vinfo)) - { - hash_set svisited; - hash_set visited; - for (i = 0; vinfo->slp_instances.iterate (i, &instance); ++i) - { - vect_location = instance->location (); - vect_bb_slp_mark_live_stmts (bb_vinfo, SLP_INSTANCE_TREE (instance), - instance, &instance->cost_vec, svisited, - visited); - } - } + vect_bb_slp_mark_live_stmts (bb_vinfo); return !vinfo->slp_instances.is_empty (); }