public void Visit(GreaterThan m)
{
//compare and push 1 if carry and zero are 0
//zc
//00 = a > b
//01 = a < b
//10 = a == b
//push a 1 if zc == 0
sw.WriteLine("\tnop ;a > b");
sw.WriteLine("\tpop bx");
sw.WriteLine("\tpop ax");
sw.WriteLine("\tcmp ax,bx");
string psh = GetNextLabel();
string yes = GetNextLabel();
//sw.WriteLine("\tbls 4 ; C or Z is set - load a #0");
sw.WriteLine("\tja " + yes.Substring(0, yes.Length - 1));
sw.WriteLine("\tmov ax,0");
sw.WriteLine("\tjmp " + psh.Substring(0, psh.Length - 1));
sw.WriteLine(yes);
sw.WriteLine("\tmov ax,1");
sw.WriteLine(psh);
sw.WriteLine("\tpush ax");
}
public void Visit(GreaterThan m)
{/*
* Console.WriteLine("pop stack into a");
* Console.WriteLine("pop stack into b");
* Console.WriteLine("compare a,b");
* Console.WriteLine("push a 1 if carry flag set");
*/
PopAndCompare();
//carry flag is not set or the
//zero flag is set
//zc
//00 - less than
//01 - greater than (no)
//11 - equal
//need to determine z + c == 0
sw.WriteLine("\tphp ; flags -> a");
sw.WriteLine("\tpla");
sw.WriteLine("\tand #3 ; isolate z and c for greater than");
sw.WriteLine("\tcmp #1 ; test zc = 01");
sw.WriteLine("\tphp ; zc -> a");
sw.WriteLine("\tpla");
sw.WriteLine("\tlsr a ; right align z");
sw.WriteLine("\tand #1 ; isolate z");
sw.WriteLine("\tpha ; push result of gt");
}
public void Visit(GreaterThan m)
{
//compare and push 1 if carry and zero are 0
//zc
//00 = a > b
//01 = a < b
//10 = a == b
//push a 1 if zc == 0
sw.WriteLine("\t;a > b");
sw.WriteLine("\tpuls a");
sw.WriteLine("\tsta temp");
sw.WriteLine("\tpuls a");
sw.WriteLine("\tcmpa temp");
string psh = GetNextLabel();
string zero = GetNextLabel();
//sw.WriteLine("\tbls #4 ; C or Z is set - load a #0");
sw.WriteLine("\tbls " + zero);
sw.WriteLine("\tlda #1");
sw.WriteLine("\tbra " + psh);
sw.WriteLine(zero);
sw.WriteLine("\tlda #0");
sw.WriteLine(psh);
sw.WriteLine("\tpshs a");
}
public void Visit(GreaterThan m)
{
//compare and push 1 if carry and zero are 0
//zc
//00 = a > b
//01 = a < b
//10 = a == b
//push a 1 if zc == 0
sw.WriteLine(Tabs() + "// ;a > b");
sw.WriteLine(Tabs() + "param2 = param_stack_pop();");
sw.WriteLine(Tabs() + "param1 = param_stack_pop();");
sw.WriteLine(Tabs() + "param_stack.push((short)(param1 > param2));");
}
public void Visit(GreaterThan m)
{
//push a 1 if carry = 0 and z == 0
sw.WriteLine("\t; a > b");
sw.WriteLine("\tpop bc");
sw.WriteLine("\tpop af");
sw.WriteLine("\tcp b");
sw.WriteLine("\tjr c,6 ; skip to push 0");
sw.WriteLine("\tdb 38h ; jrc");
sw.WriteLine("\tdb 6;");
sw.WriteLine("\tld a,1");
sw.WriteLine("\tjr z,4 ; skip to push 0");
sw.WriteLine("\tdb 28h; jrz");
sw.WriteLine("\tdb 4;");
sw.WriteLine("\tld a,1");
sw.WriteLine("\t;jr 2");
sw.WriteLine("\tdb 18h ; jr");
sw.WriteLine("\tdb 2");
sw.WriteLine("\tld a,0");
sw.WriteLine("\tpush af");
}
