modelsim fixes && pipeline optimization

hw/rtl/VX_platform.vh

@@ -0,0 +1,58 @@
+`ifndef VX_PLATFORM
+`define VX_PLATFORM
+
+`ifndef NDEBUG
+    `define DEBUG_BLOCK(x) /* verilator lint_off UNUSED */ \
+                           x \
+                           /* verilator lint_on UNUSED */
+`else
+    `define DEBUG_BLOCK(x)
+`endif
+
+`define DEBUG_BEGIN /* verilator lint_off UNUSED */ 
+
+`define DEBUG_END   /* verilator lint_on UNUSED */     
+
+`define IGNORE_WARNINGS_BEGIN /* verilator lint_off UNUSED */ \
+                              /* verilator lint_off PINCONNECTEMPTY */ \
+                              /* verilator lint_off WIDTH */ \
+                              /* verilator lint_off UNOPTFLAT */ \
+                              /* verilator lint_off UNDRIVEN */ \
+                              /* verilator lint_off DECLFILENAME */
+
+`define IGNORE_WARNINGS_END   /* verilator lint_on UNUSED */ \
+                              /* verilator lint_on PINCONNECTEMPTY */ \
+                              /* verilator lint_on WIDTH */ \
+                              /* verilator lint_on UNOPTFLAT */ \
+                              /* verilator lint_on UNDRIVEN */ \
+                              /* verilator lint_on DECLFILENAME */
+
+`define UNUSED_VAR(x) /* verilator lint_off UNUSED */ \
+                      wire [$bits(x)-1:0] __``x``__ = x; \
+                      /* verilator lint_on UNUSED */
+
+`define UNUSED_PIN(x)  /* verilator lint_off PINCONNECTEMPTY */ \
+                       . x () \
+                       /* verilator lint_on PINCONNECTEMPTY */
+
+`define STRINGIFY(x) `"x`"
+
+`define STATIC_ASSERT(cond, msg)    \
+    generate                        \
+        if (!(cond)) $error(msg);   \
+    endgenerate
+
+`define ENABLE_TRACING  /* verilator tracing_on */
+`define DISABLE_TRACING /* verilator tracing_off */
+
+`define CLOG2(x)    $clog2(x)
+`define FLOG2(x)    ($clog2(x) - (((1 << $clog2(x)) > (x)) ? 1 : 0))
+`define LOG2UP(x)   (((x) > 1) ? $clog2(x) : 1)
+`define ISPOW2(x)   (((x) != 0) && (0 == ((x) & ((x) - 1))))
+
+`define MIN(x, y)   ((x < y) ? (x) : (y))
+`define MAX(x, y)   ((x > y) ? (x) : (y))
+
+`define UP(x)       (((x) > 0) ? x : 1)
+
+`endif