sbgemm: cooperlake: unroll core loop by 2

kernel/x86_64/sbgemm_kernel_16x4_cooperlake.c

@@ -201,7 +201,31 @@ int CNAME (BLASLONG m, BLASLONG n, BLASLONG k, FLOAT alpha, IFLOAT * A, IFLOAT *
 			DECLARE_B_PAIR();
 			DECLARE_RESULT_4X(0, 0, 0); DECLARE_RESULT_4X(0, 0, 1); DECLARE_RESULT_4X(0, 0, 2);
 			DECLARE_RESULT_4X(0, 1, 0); DECLARE_RESULT_4X(0, 1, 1); DECLARE_RESULT_4X(0, 1, 2);
-			for (k_count = k; k_count > 1; k_count -=2) {
+			k_count = k;
+			for (; k_count > 3; k_count -=4) {
+				LOAD_A_PAIR(0);
+				ptr_a0 += 16 * 2;
+				BROADCAST_B_PAIR(0, 0); MATMUL_4X(0, 0, 0);
+				BROADCAST_B_PAIR(0, 1); MATMUL_4X(0, 0, 1);
+				BROADCAST_B_PAIR(0, 2); MATMUL_4X(0, 0, 2);
+				ptr_b0 += 4 * 2;
+				BROADCAST_B_PAIR(1, 0); MATMUL_4X(0, 1, 0);
+				BROADCAST_B_PAIR(1, 1); MATMUL_4X(0, 1, 1);
+				BROADCAST_B_PAIR(1, 2); MATMUL_4X(0, 1, 2);
+				ptr_b1 += 4 * 2;
+
+				LOAD_A_PAIR(0);
+				ptr_a0 += 16 * 2;
+				BROADCAST_B_PAIR(0, 0); MATMUL_4X(0, 0, 0);
+				BROADCAST_B_PAIR(0, 1); MATMUL_4X(0, 0, 1);
+				BROADCAST_B_PAIR(0, 2); MATMUL_4X(0, 0, 2);
+				ptr_b0 += 4 * 2;
+				BROADCAST_B_PAIR(1, 0); MATMUL_4X(0, 1, 0);
+				BROADCAST_B_PAIR(1, 1); MATMUL_4X(0, 1, 1);
+				BROADCAST_B_PAIR(1, 2); MATMUL_4X(0, 1, 2);
+				ptr_b1 += 4 * 2;
+			}
+			for (; k_count > 1; k_count -=2) {
 				LOAD_A_PAIR(0);
 				ptr_a0 += 16 * 2;
 				BROADCAST_B_PAIR(0, 0); MATMUL_4X(0, 0, 0);