floating point support fixes

hw/rtl/interfaces/VX_csr_to_fpu_if.v

@@ -0,0 +1,17 @@
+`ifndef VX_CSR_TO_FPU_IF
+`define VX_CSR_TO_FPU_IF
+
+`include "VX_define.vh"
+
+`ifndef EXTF_F_ENABLE
+    `IGNORE_WARNINGS_BEGIN
+`endif
+
+interface VX_csr_to_fpu_if ();
+
+	wire [`NW_BITS-1:0]  warp_num;
+	wire [`FRM_BITS-1:0] frm;
+
+endinterface
+
+`endif