x64: brgemm conv: heuristic for big convolution on avx2

Author: ankalinin

src/cpu/x64/jit_brgemm_conv_utils.cpp

@@ -1940,12 +1940,17 @@ status_t init_conf(jit_brgemm_conv_conf_t &jcp, cpu_isa_t isa,
     using namespace data_type;
     // ======================= blocking =================================
 
-    auto bcast_amount
-            = static_cast<size_t>(jcp.id) * jcp.ih * jcp.iw * jcp.src_dsz;
+    auto bcast_amount = static_cast<size_t>(jcp.id) * jcp.ih * jcp.iw
+            * jcp.src_dsz * jcp.ic;
     auto wei_amount = static_cast<size_t>(jcp.oc) * jcp.kd * jcp.kh * jcp.kw
-            * jcp.wei_dsz;
-
-    jcp.loop_order = (bcast_amount < wei_amount) ? loop_ngcdhw : loop_ndhwgc;
+            * jcp.wei_dsz * jcp.ic;
+
+    jcp.loop_order
+            = (one_of(isa, avx2, avx2_vnni, avx2_vnni_2) && jcp.mb > jcp.nthr
+                      && bcast_amount > brg_blocking_t::L2
+                      && wei_amount > brg_blocking_t::L2)
+            ? loop_gcndhw
+            : ((bcast_amount < wei_amount) ? loop_ngcdhw : loop_ndhwgc);
     jcp.brgemm_kernel_loop_order
             = brgemm_kernel_loop_order_t::brgemm_lo_default;
 
@@ -1963,6 +1968,13 @@ status_t init_conf(jit_brgemm_conv_conf_t &jcp, cpu_isa_t isa,
         const bool small_amx_job = est_amx_job < 64 || jcp.oc < 256;
         auto start_ocb
                 = (is_amx(isa) && jcp.is_os_blocking && small_amx_job) ? 2 : 4;
+        if (one_of(isa, avx2, avx2_vnni, avx2_vnni_2)
+                && jcp.loop_order == loop_gcndhw)
+            start_ocb = 2;
+        if (one_of(isa, avx2, avx2_vnni, avx2_vnni_2)
+                && jcp.oh * jcp.ow >= 150 * 150)
+            start_ocb = 2;
+
         start_ocb = nstl::min(div_up(jcp.oc, jcp.acc_simd_w), start_ocb);
 
         auto finish_ocb = 1;
@@ -2215,7 +2227,6 @@ status_t init_conf(jit_brgemm_conv_conf_t &jcp, cpu_isa_t isa,
 #endif
 
     // ============ end blocking ===========================================
-
     jcp.brg_type
             = (jcp.use_uker && one_of(jcp.exec_type, exec_base, exec_trans))
             ? brgemm_static_offs