Hi Bin,
On 15/10/16 00:15, Bin Cheng wrote:
+/* Test for likely overcommitment of vector hardware resources. If a
+ loop iteration is relatively large, and too large a percentage of
+ instructions in the loop are vectorized, the cost model may not
+ adequately reflect delays from unavailable vector resources.
+ Penalize the loop body cost for this case. */
+
+static void
+aarch64_density_test (struct aarch64_vect_loop_cost_data *data)
+{
+ const int DENSITY_PCT_THRESHOLD = 85;
+ const int DENSITY_SIZE_THRESHOLD = 128;
+ const int DENSITY_PENALTY = 10;
+ struct loop *loop = data->loop_info;
+ basic_block *bbs = get_loop_body (loop);
Is this worth being part of the cost model such that it can have
different defaults for different micro-architecture?
Thanks,
Kugan
