Torque3D/Engine/source/console/torquescript/optimizer.cpp

//-----------------------------------------------------------------------------
// Copyright (c) 2013 GarageGames, LLC
// Copyright (c) 2021 TGEMIT Authors & Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

#include "codeBlock.h"

static bool isLiteralNumber(ExprNode* node)
{
   ExprNodeName name = node->getExprNodeNameEnum();
   return name == NameFloatNode || name == NameIntNode;
}

static F64 getFloatValue(ExprNode* node)
{
   if (node->getExprNodeNameEnum() == NameFloatNode)
      return static_cast<FloatNode*>(node)->value;
   return (F64)static_cast<IntNode*>(node)->value;
}

static S32 getIntValue(ExprNode* node)
{
   if (node->getExprNodeNameEnum() == NameFloatNode)
      return (S32)static_cast<FloatNode*>(node)->value;
   return static_cast<IntNode*>(node)->value;
}

bool FloatBinaryExprNode::optimize()
{
   // Perform constant folding
   if (isLiteralNumber(right) && isLiteralNumber(left))
   {
      F64 rightValue = getFloatValue(right);
      F64 leftValue = getFloatValue(left);
      F64 result = 0.0;

      switch (op)
      {
      case '+':
         result = leftValue + rightValue;
         break;
      case '-':
         result = leftValue - rightValue;
         break;
      case '*':
         result = leftValue * rightValue;
         break;
      case '/':
         if (rightValue != 0.0)
            result = leftValue / rightValue;
         break;
      }

      optimizedNode = FloatNode::alloc(dbgLineNumber, result);
      return true;
   }

   return false;
}

bool IntBinaryExprNode::optimize()
{
   if (op == '%' && left->getExprNodeNameEnum() == NameVarNode && isLiteralNumber(right))
   {
      // %a % intconst
      S32 val = getIntValue(right);
      switch (val)
      {
      case 2:
         op = '&';
         optimizedNode = IntNode::alloc(dbgLineNumber, 1);
         return true;
      case 4:
         op = '&';
         optimizedNode = IntNode::alloc(dbgLineNumber, 3);
         return true;
      case 8:
         op = '&';
         optimizedNode = IntNode::alloc(dbgLineNumber, 7);
         return true;
      }
   }

   return false;
}