[PATCH 2/3] riscv: Add simple gather/scatter costs.

[Robin Dapp]

From: Robin Dapp <robin.d...@oss.qualcomm.com>

This simply costs gather/scatter according to the number of elements in the
vectype.

gcc/ChangeLog:

        * config/riscv/riscv-vector-costs.cc (costs::adjust_stmt_cost):
        Cost gather/scatter.
---
 gcc/config/riscv/riscv-vector-costs.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/config/riscv/riscv-vector-costs.cc 
b/gcc/config/riscv/riscv-vector-costs.cc
index d26a390793c..db31e972638 100644
--- a/gcc/config/riscv/riscv-vector-costs.cc
+++ b/gcc/config/riscv/riscv-vector-costs.cc
@@ -1498,6 +1498,13 @@ costs::adjust_stmt_cost (enum vect_cost_for_stmt kind, 
loop_vec_info loop,
          break;
        }
 
+    case vector_gather_load:
+    case vector_scatter_store:
+       {
+         stmt_cost *= vect_nunits_for_cost (vectype);
+         break;
+       }
+
     default:
       break;
     }
-- 
2.56.0