Revert "Support constant folding of exponential built-ins"

src/compiler/translator/IntermNode.cpp

@@ -1284,52 +1284,6 @@ TIntermTyped *TIntermConstantUnion::fold(
                     return nullptr;
                 break;
 
-              case EOpExp:
-                if (!foldFloatTypeUnary(unionArray[i], &expf, infoSink, &tempConstArray[i]))
-                  return nullptr;
-                break;
-
-              case EOpLog:
-                // For log(x), results are undefined if x <= 0, we are choosing to set result to 0.
-                if (getType().getBasicType() == EbtFloat && unionArray[i].getFConst() <= 0.0f)
-                    tempConstArray[i].setFConst(0.0f);
-                else if (!foldFloatTypeUnary(unionArray[i], &logf, infoSink, &tempConstArray[i]))
-                    return nullptr;
-                break;
-
-              case EOpExp2:
-                if (!foldFloatTypeUnary(unionArray[i], &exp2f, infoSink, &tempConstArray[i]))
-                    return nullptr;
-                break;
-
-              case EOpLog2:
-                // For log2(x), results are undefined if x <= 0, we are choosing to set result to 0.
-                if (getType().getBasicType() == EbtFloat && unionArray[i].getFConst() <= 0.0f)
-                    tempConstArray[i].setFConst(0.0f);
-                else if (!foldFloatTypeUnary(unionArray[i], &log2f, infoSink, &tempConstArray[i]))
-                    return nullptr;
-                break;
-
-              case EOpSqrt:
-                // For sqrt(x), results are undefined if x < 0, we are choosing to set result to 0.
-                if (getType().getBasicType() == EbtFloat && unionArray[i].getFConst() < 0.0f)
-                    tempConstArray[i].setFConst(0.0f);
-                else if (!foldFloatTypeUnary(unionArray[i], &sqrtf, infoSink, &tempConstArray[i]))
-                    return nullptr;
-                break;
-
-              case EOpInverseSqrt:
-                // There is no stdlib built-in function equavalent for GLES built-in inversesqrt(),
-                // so getting the square root first using builtin function sqrt() and then taking its inverse.
-                // Also, for inversesqrt(x), results are undefined if x <= 0, we are choosing to set result to 0.
-                if (getType().getBasicType() == EbtFloat && unionArray[i].getFConst() <= 0.0f)
-                    tempConstArray[i].setFConst(0.0f);
-                else if (!foldFloatTypeUnary(unionArray[i], &sqrtf, infoSink, &tempConstArray[i]))
-                    return nullptr;
-                else
-                    tempConstArray[i].setFConst(1.0f / tempConstArray[i].getFConst());
-                break;
-
               default:
                 return NULL;
             }