speeding up simulation using dedicated full dpi-based FPU core

hw/dpi/util_dpi.vh

@@ -0,0 +1,7 @@
+`ifndef UTIL_DPI
+`define UTIL_DPI
+
+import "DPI-C" context function int dpi_register();
+import "DPI-C" context function void dpi_assert(int inst, input logic cond, input int delay);
+
+`endif