Add static arrays declaration on GPU constant memory

Signed-off-by: Rafael Ravedutti <rafaelravedutti@gmail.com>

src/pairs/code_gen/cgen.py

@@ -50,6 +50,16 @@ class CGen:
         self.print("")
         self.print("using namespace pairs;")
         self.print("")
+
+        if self.target.is_gpu():
+            for array in self.sim.arrays.statics():
+                if array.device_flag:
+                    t = array.type()
+                    tkw = Types.ctype2keyword(t)
+                    size = self.generate_expression(BinOp.inline(array.alloc_size()))
+                    self.print(f"__constant__ {tkw} d_{array.name()}[{size}];")
+
+        self.print("")
         for module in self.sim.modules():
             self.generate_module(module)
         self.print.end()

src/pairs/ir/arrays.py

@@ -27,6 +27,9 @@ class Arrays:
     def all(self):
         return self.arrays
 
+    def statics(self):
+        return [a for a in self.arrays if a.is_static()]
+
     def find(self, a_name):
         array = [a for a in self.arrays if a.name() == a_name]
         if array: