vect: Add a function to check lane-reducing stmt

Add a utility function to check if a statement is lane-reducing operation,
which could simplify some existing code.

2024-06-16 Feng Xue <fxue@os.amperecomputing.com>

gcc/
	* tree-vectorizer.h (lane_reducing_stmt_p): New function.
	* tree-vect-slp.cc (vect_analyze_slp): Use new function
	lane_reducing_stmt_p to check statement.

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 7d18b5bfee5d24cc831829c3ac0863593893088a..a5665946a4ebcbadd681e5b0272ab9d44876ccef 100644 (file)
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -3919,7 +3919,6 @@ vect_analyze_slp (vec_info *vinfo, unsigned max_tree_size)
          scalar_stmts.create (loop_vinfo->reductions.length ());
          for (auto next_info : loop_vinfo->reductions)
            {
-             gassign *g;
              next_info = vect_stmt_to_vectorize (next_info);
              if ((STMT_VINFO_RELEVANT_P (next_info)
                   || STMT_VINFO_LIVE_P (next_info))
@@ -3931,8 +3930,7 @@ vect_analyze_slp (vec_info *vinfo, unsigned max_tree_size)
                {
                  /* Do not discover SLP reductions combining lane-reducing
                     ops, that will fail later.  */
-                 if (!(g = dyn_cast <gassign *> (STMT_VINFO_STMT (next_info)))
-                     || !lane_reducing_op_p (gimple_assign_rhs_code (g)))
+                 if (!lane_reducing_stmt_p (STMT_VINFO_STMT (next_info)))
                    scalar_stmts.quick_push (next_info);
                  else
                    {

diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h
index 6bb0f5c3a56f6e8afcb11b2799c75d0f8f4c4377..60224f4e284723466db1c7e68534a82f798fe323 100644 (file)
--- a/gcc/tree-vectorizer.h
+++ b/gcc/tree-vectorizer.h
@@ -2169,12 +2169,24 @@ vect_apply_runtime_profitability_check_p (loop_vec_info loop_vinfo)
          && th >= vect_vf_for_cost (loop_vinfo));
 }
 
+/* Return true if CODE is a lane-reducing opcode.  */
+
 inline bool
 lane_reducing_op_p (code_helper code)
 {
   return code == DOT_PROD_EXPR || code == WIDEN_SUM_EXPR || code == SAD_EXPR;
 }
 
+/* Return true if STMT is a lane-reducing statement.  */
+
+inline bool
+lane_reducing_stmt_p (gimple *stmt)
+{
+  if (auto *assign = dyn_cast <gassign *> (stmt))
+    return lane_reducing_op_p (gimple_assign_rhs_code (assign));
+  return false;
+}
+
 /* Source location + hotness information. */
 extern dump_user_location_t vect_location;