Fix a bug in constant folding pass (#53456)

paddle/fluid/framework/ir/constant_folding_pass.cc

@@ -64,7 +64,7 @@ void ConstantFoldingPass::ApplyImpl(ir::Graph *graph) const {
       platform::errors::Fatal(
           "scope must not be null when applying constant floding."));
 
-  std::vector<std::string> blacklist{"feed", "matrix_multiply"};
+  std::vector<std::string> blacklist{"feed", "matrix_multiply", "save"};
 
   auto op_node_sorted = framework::ir::TopologyVarientSort(
       *graph, static_cast<framework::ir::SortKind>(0));

paddle/fluid/inference/api/paddle_pass_builder.cc

@@ -420,6 +420,7 @@ void CpuPassStrategy::EnableMkldnnInt8() {
     passes_.push_back("simplify_with_basic_ops_pass");
     passes_.push_back("quant_dequant_mkldnn_pass");
     passes_.push_back("mkldnn_placement_pass");
+    passes_.push_back("constant_folding_pass");
     passes_.push_back("squeeze2_transpose2_onednn_fuse_pass");
     passes_.push_back("layer_norm_fuse_pass");
     passes_.push_back("attention_lstm_fuse_pass");
@@ -474,7 +475,6 @@ void CpuPassStrategy::EnableMkldnnInt8() {
     passes_.push_back("quant_transpose2_dequant_onednn_fuse_pass");
     passes_.push_back("int8_scale_calculation_mkldnn_pass");
     passes_.push_back("params_quantization_mkldnn_pass");
-    passes_.push_back("constant_folding_pass");
   }
   use_mkldnn_int8_ = true;
 #else

paddle/fluid/operators/mkldnn/fc_mkldnn_op.cc

@@ -192,7 +192,9 @@ class FCMKLDNNHandler
     } else {
       auto scale_in_data = ctx.Attr<float>("Scale_in");
       auto scale_weights_data = ctx.Attr<std::vector<float>>("Scale_weights");
-      bool has_activation = !ctx.Attr<std::string>("activation_type").empty();
+      bool has_activation = !ctx.Attr<std::string>("activation_type").empty() ||
+                            (ctx.HasAttr("fuse_activation") &&
+                             !ctx.Attr<std::string>("fuse_activation").empty());
       bool force_fp32_output = ctx.Attr<bool>("force_fp32_output");
       bool fuse_residual_conn = ctx.HasAttr("fuse_residual_connection") &&
                                 ctx.Attr<bool>("fuse_residual_connection");