private List <Expression> ExtractFromFunctionCall(FunctionCall funCall)
{
funCall.Arguments = funCall.Arguments.Select((argument, i) =>
{
if (argument is AST.Variable variableArgument)
{
var isModifiedByAnotherArgument = funCall
.Arguments
.Skip(i + 1)
.Any(followingArgument => this.variableAccess.Modifies[followingArgument]
.Contains(variableArgument.Declaration));
if (isModifiedByAnotherArgument)
{
var tmpDeclaration =
new VariableDeclaration(argument.InputRange, argument.Type, "tmp", argument)
{
IntermediateVariable = new VirtualRegister()
};
var tmpVariable = new AST.Variable(tmpDeclaration.InputRange, "tmp")
{
Declaration = tmpDeclaration, Type = argument.Type
};
var instructionBlock = new InstructionBlock(
tmpDeclaration.InputRange,
new List <Expression> {
tmpDeclaration
});
return((Expression) new BlockWithResult(
tmpDeclaration.InputRange,
instructionBlock,
tmpVariable)
{
Type = tmpVariable.Type
});
}
}
var instructions = this.ExtractTemporaryVariables(argument);
return(new BlockWithResult(
funCall.InputRange,
new InstructionBlock(funCall.InputRange, instructions),
argument)
{
Type = argument.Type
});
}).ToList();
return(new List <Expression>());
}
private List <Expression> ExtractFromOperationNode(BinaryOperation operationNode)
{
// In (A op B)
// We'd like to compute A before B if both A and B use variable x and at least one of them modifies it
var modifiedVariablesLeft = this.variableAccess.Modifies[operationNode.LeftValue];
var modifiedVariablesRight = this.variableAccess.Modifies[operationNode.RightValue];
var usedVariablesLeft = this.variableAccess.Accesses[operationNode.LeftValue];
var usedVariablesRight = this.variableAccess.Accesses[operationNode.RightValue];
operationNode.LeftValue = this.ReplaceWithBlock(operationNode.LeftValue);
var result = new List <Expression>();
if (modifiedVariablesLeft.Any(x => usedVariablesRight.Contains(x)) ||
modifiedVariablesRight.Any(x => usedVariablesLeft.Contains(x)))
{
var tmpDecl = new VariableDeclaration(
operationNode.LeftValue.InputRange,
operationNode.LeftValue.Type,
"tmp",
operationNode.LeftValue)
{
IntermediateVariable = new VirtualRegister()
};
var tmpVar = new AST.Variable(tmpDecl.InputRange, "tmp")
{
Declaration = tmpDecl
};
result.Add(tmpDecl);
operationNode.LeftValue = tmpVar;
}
operationNode.RightValue = this.ReplaceWithBlock(operationNode.RightValue);
return(result);
}
