private static bool CompileIntegerDivision(CodeGen codeGen, ILinkingInfo linkingInfo, Type type, Register leftReg, ExpressionResult rightExpr)
{
var rightReg = type.OtherVolatileIntRegister(leftReg, Register64.RAX, Register64.RDX);
rightExpr.GenerateMoveTo(rightReg, type, codeGen, linkingInfo);
if (!leftReg.IsSameRegister(Register64.RAX))
{
codeGen.Mov(Register64.RAX, leftReg.AsR64());
}
var typeIsByte = type.SizeOf() == 1;
var typeIsSigned = type.IsSignedInteger();
if (typeIsByte)
{
if (typeIsSigned)
{
codeGen.Movsx(Register64.RAX, Register8.AL);
}
else
{
codeGen.Movzx(Register64.RAX, Register8.AL);
}
}
else
{
codeGen.Xor(Register64.RDX, Register64.RDX);
if (typeIsSigned)
{
codeGen.Test(Register64.RAX, Register64.RAX);
codeGen.Jns(CodeGenExtensions.InstructionLength(gen => gen.Not(Register64.RDX)));
codeGen.Not(Register64.RDX);
}
}
if (type.IsSignedInteger())
{
codeGen.Idiv(rightReg);
}
else
{
codeGen.Div(rightReg);
}
return(typeIsByte);
}
public void DefineLocal(string identifier, Type type) => _definedLocalTypes[identifier] = type;