vect: Tighten an assertion for lane-reducing in transform

According to logic of code nearby the assertion, all lane-reducing operations
should not appear, not just DOT_PROD_EXPR. Since "use_mask_by_cond_expr_p"
treats SAD_EXPR same as DOT_PROD_EXPR, and WIDEN_SUM_EXPR should not be allowed
by the following assertion "gcc_assert (commutative_binary_op_p (...))", so
tighten the assertion.

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

gcc/
	* tree-vect-loop.cc (vect_transform_reduction): Change assertion to
	cover all lane-reducing ops.

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 1d60ac47e553135e7a77e89ac769ee1f60af24bc..347dac97e497e6abba70c8fbd282439cdd9fa49b 100644 (file)
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -8618,7 +8618,8 @@ vect_transform_reduction (loop_vec_info loop_vinfo,
     }
 
   bool single_defuse_cycle = STMT_VINFO_FORCE_SINGLE_CYCLE (reduc_info);
-  gcc_assert (single_defuse_cycle || lane_reducing_op_p (code));
+  bool lane_reducing = lane_reducing_op_p (code);
+  gcc_assert (single_defuse_cycle || lane_reducing);
 
   /* Create the destination vector  */
   tree scalar_dest = gimple_get_lhs (stmt_info->stmt);
@@ -8674,8 +8675,9 @@ vect_transform_reduction (loop_vec_info loop_vinfo,
       tree vop[3] = { vec_oprnds[0][i], vec_oprnds[1][i], NULL_TREE };
       if (masked_loop_p && !mask_by_cond_expr)
        {
-         /* No conditional ifns have been defined for dot-product yet.  */
-         gcc_assert (code != DOT_PROD_EXPR);
+         /* No conditional ifns have been defined for lane-reducing op
+            yet.  */
+         gcc_assert (!lane_reducing);
 
          /* Make sure that the reduction accumulator is vop[0].  */
          if (reduc_index == 1)