[Fix] [Feature] Apply WA to remove gemm legacy on avx512.

[FORK][FEATURE] cpu: remove gemm legacy on avx512.

Author: luweizhou2016

src/cpu/rnn/ref_rnn.hpp

@@ -305,12 +305,17 @@ struct _ref_rnn_common_t : public primitive_t {
                             (rnn_.is_bf16_conf() || rnn_.is_f32_conf()));
 
             if (!ok) return status::unimplemented;
-
+#if !__BUILD_GEMM_AVX512
+            // WA: enable gru brgemm on avx512 f32 to avoid dien.xml regression when removing gemm legacy on avx512.
+            const auto enable_brgemm_gru = mayiuse(avx512_core) && rnn_.is_cell_dt_f32();
+#else
+            const auto enable_brgemm_gru = false;
+#endif
             // Support for GRU / AUGRU cell in BRGEMM-based implementation is
             // limited by forward_inference pass for now, all_f32 is disabled
-            // due to performance degradation.
+            // due to performance degradation except the case GEMM legacy is removed on avx512 core.
             // TODO: Improve GRU / AUGRU coverage in BRGEMM-based implementation
-            ok = IMPLICATION(rnn_.is_orig_gru,
+            ok = IMPLICATION(rnn_.is_orig_gru && !enable_brgemm_gru,
                     this->desc()->prop_kind == forward_inference
                             && !rnn_.is_cell_dt_f32());
             if (!ok) return status::unimplemented;

src/cpu/x64/gemm/gemm_info.cpp

@@ -360,6 +360,7 @@ void gemm_info_t<a_t, b_t, c_t>::jit_init(void) {
     static std::once_flag initialized;
     static std::atomic<dnnl_status_t> st(dnnl_success);
     std::call_once(initialized, [&, um] {
+        MAYBE_UNUSED(um);
 #if __BUILD_GEMM_AVX512
         const bool b_is_s8 = data_traits<b_t>::data_type == data_type::s8;
 #endif