[luci/pass] Revise FoldCastPass to use enum for types (Samsung#12398)

This will revise FoldCastPass to use enum for possible cast types.

ONE-DCO-1.0-Signed-off-by: SaeHie Park <[email protected]>

compiler/luci/pass/src/FoldCastPass.cpp

@@ -26,14 +26,20 @@ luci::CircleConst *cast_const(luci::CircleConst *node, loco::DataType from_dtype
 {
   assert(node->dtype() == from_dtype);
 
-  bool do_casting = false;
+  enum CAST_TYPES
+  {
+    CAST_NONE = 0,
+    CAST_S64_S32,
+  };
+
+  CAST_TYPES cast_type = CAST_NONE;
   if (from_dtype == loco::DataType::S64)
   {
     if (to_dtype == loco::DataType::S32)
-      do_casting = true;
+      cast_type = CAST_S64_S32;
   }
   // TODO: Support more data types
-  if (not do_casting)
+  if (cast_type == CAST_NONE)
     return nullptr;
 
   auto name = node->name();
@@ -52,9 +58,9 @@ luci::CircleConst *cast_const(luci::CircleConst *node, loco::DataType from_dtype
   constant->shape_status(luci::ShapeStatus::VALID);
 
   // TODO: Support more data types
-  if (from_dtype == loco::DataType::S64)
+  switch (cast_type)
   {
-    if (to_dtype == loco::DataType::S32)
+    case CAST_S64_S32:
     {
       constant->size<loco::DataType::S32>(num_elems);
       for (uint32_t i = 0; i < num_elems; i++)
@@ -64,7 +70,8 @@ luci::CircleConst *cast_const(luci::CircleConst *node, loco::DataType from_dtype
       constant->name(name + "_S32");
       return constant;
     }
-    return nullptr;
+    default:
+      break;
   }
 
   return nullptr;