fix infershape in compile time (#45156)

paddle/phi/infermeta/unary.cc

@@ -3872,6 +3872,7 @@ void UnfoldInferMeta(const MetaTensor& x,
                                                 paddings[1],
                                                 paddings[3],
                                                 strides[1]);
+  int output_col_length = output_height * output_width;
   if (config.is_runtime) {
     // only check output height and width in runtime
     PADDLE_ENFORCE_GT(
@@ -3910,8 +3911,10 @@ void UnfoldInferMeta(const MetaTensor& x,
             dilations[1],
             output_height,
             output_width));
+  } else {
+    output_col_length =
+        output_height == -1 || output_width == -1 ? -1 : output_col_length;
   }
-  int output_col_length = output_height * output_width;
   out_dims.push_back(output_col_length);
   out->set_dims(phi::make_ddim(out_dims));
 }

paddle/phi/kernels/funcs/unfold_functor.h

@@ -26,7 +26,7 @@ inline int CalcOutputSize(int input_size,
                           int stride) {
   const int dkernel = dilation * (filter_size - 1) + 1;
   int output_size = (input_size + padding1 + padding2 - dkernel) / stride + 1;
-  return output_size;
+  return input_size == -1 ? -1 : output_size;
 }
 
 }  // namespace funcs