temporary benchmark, <vvaddint32> working

rvvector/benchmark_temp/vx_vec_vsadd.s

@@ -0,0 +1,20 @@
+.type vx_vec_vsadd, @function
+.global vx_vec_vsadd
+#  vector-scalar add
+#  N = a0, a[] = a1, B = a2
+#  for (i=0; i<N; i++)
+#     { C[i] = A[i] + B; } // 32-bit ints
+#
+vx_vec_vsadd:
+#	vcfg2*V32bINT, 1*S32bINT #
+#     vmv v2, a2   # Copy B to vector unit scalar
+loop:
+#     setvl t0, a0 # a0 holds N, t0 holds amount done
+     ld v0, a1    # load strip of A vector
+     vadd v1, v0, v2 # add vectors
+     st v1, a3    # store strip of C vector
+     slli t1, t0, 2 # multiply by 4 to get bytes  
+     add a1, a1, t1 # bump pointers  
+     add a3, a3, t1  
+     sub a0, a0, t0 # Subtract amount done
+     bnez a0, loop