public override void BranchIf(bool sense, Label target)
{
var f = FuncBuilder.Instance;
var emitter = CodeGenerator.Emitter;
var declarer = f.Declare;
using (f.OpenScope("compare")) {
var lhsTemp = declarer.Int("lhs");
var rhsTemp = declarer.Int("rhs");
var lhsResult = lhs.EvaluateTo(lhsTemp);
var rhsResult = rhs.EvaluateTo(rhsTemp);
var lhsReg = lhsResult.ToRegister(f.Scratch0);
var rhsRegOrByte = rhsResult.ToRegisterOrByte(f.Scratch1);
if (rhsRegOrByte.IsRegister)
{
emitter.Emit(Format4OpCode.CMP, lhsReg, rhsRegOrByte.Register);
}
else
{
emitter.Emit(Format3OpCode.CMP, lhsReg, rhsRegOrByte.Byte);
}
var instructionToUse = sense ? branchOpCode : inverseOpCode;
var address = target.GetLabelAddressBestEffort();
emitter.Emit(instructionToUse, address);
}
}
public static void Return(this FuncBuilder f, IntExpression expr)
{
using (f.OpenScope("return")) {
var emitter = CodeGenerator.Emitter;
var resultStorage = f.Declare.Int("result");
var exprResult = expr.EvaluateTo(resultStorage);
var exprRegOrByte = exprResult.ToRegisterOrByte(f.Scratch0);
if (exprRegOrByte.IsRegister)
{
emitter.EmitRegisterMoveIfDifferent(Register.R0, exprRegOrByte.Register);
}
else
{
emitter.Emit(Format3OpCode.MOV, Register.R0, exprRegOrByte.Byte);
}
BranchLogic.UnconditionalBranchTo(f.TheExitLabel);
}
}
