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use fmt;
fn do_opc(cpu: *cpu, opc: u8) void =
if (0 <= opc && opc < op::MARK0) do_opr(cpu, opc)
else if (op::MARK0 <= opc && opc <= op::MARK15)
// who is mark
do_op_mark(cpu, opc-op::MARK0)
else if (op::LOC0 <= opc && opc <= op::LOC15)
do_op_loc(cpu, opc-op::LOC0)
else if (op::RET0 <= opc && opc <= op::RET15)
do_op_ret(cpu, opc-op::RET0)
else if (op::LIT0 <= opc && opc <= op::LIT15)
do_op_lit(cpu, opc-op::LIT0)
else abort("what???");
fn do_op_mark(cpu: *cpu, p: u8) void =
cpu.rp += p*2;
fn do_op_loc(cpu: *cpu, p: u8) void =
push(cpu, 0x100 + cpu.rp:u16 - (p-1)*2);
fn do_op_ret(cpu: *cpu, p: u8) void = {
cpu.rp -= p*2;
const rval = rpop(cpu);
cpu.pc = rval;
};
fn do_op_lit(cpu: *cpu, p: u8) void = {
push(cpu, p: u16);
};
fn do_opr(cpu: *cpu, op: u8) void = switch (op) {
case op::NOP => yield;
case op::ROT =>
const a = pop(cpu);
const b = pop(cpu);
const c = pop(cpu);
push(cpu, b);
push(cpu, a);
push(cpu, c);
case op::NRT =>
const a = pop(cpu);
const b = pop(cpu);
const c = pop(cpu);
push(cpu, a);
push(cpu, c);
push(cpu, b);
case op::DUP =>
push(cpu, peek(cpu));
case op::SWP =>
const a = pop(cpu);
const b = pop(cpu);
push(cpu, a);
push(cpu, b);
case op::OVR =>
const x = peek(cpu, 1);
push(cpu, x);
case op::DRP =>
pop(cpu);
case op::TCK =>
const y = pop(cpu);
const x = pop(cpu);
push(cpu, y);
push(cpu, x);
push(cpu, y);
case op::NIP =>
const y = pop(cpu);
pop(cpu);
push(cpu, y);
case op::EQU =>
const x = pop(cpu);
const y = pop(cpu);
push(cpu, if (x == y) 1 else 0);
case op::NEQ =>
const x = pop(cpu);
const y = pop(cpu);
push(cpu, if (x != y) 1 else 0);
case op::ADD =>
const x = pop(cpu);
const y = pop(cpu);
push(cpu, x + y);
case op::SUB =>
const y = pop(cpu);
const x = pop(cpu);
push(cpu, x - y);
case op::MUL =>
// TODO: better handling mul div
const x = pop(cpu);
const y = pop(cpu);
push(cpu, x * y);
case op::DIV =>
const y = pop(cpu);
const x = pop(cpu);
push(cpu, x / y);
case op::NEG =>
push(cpu, - pop(cpu));
case op::SLT =>
const x = pop(cpu): i16;
const y = pop(cpu): i16;
push(cpu, if (y < x) 1 else 0);
case op::SLE =>
const x = pop(cpu): i16;
const y = pop(cpu): i16;
push(cpu, if (y <= x) 1 else 0);
case op::ULT =>
const x = pop(cpu): u16;
const y = pop(cpu): u16;
push(cpu, if (y < x) 1 else 0);
case op::ULE =>
const x = pop(cpu): u16;
const y = pop(cpu): u16;
push(cpu, if (y <= x) 1 else 0);
case op::LOD =>
// TODO lod and sto for bytes
const addr = pop(cpu);
push(cpu, rmem(cpu.mem, addr));
case op::STO =>
const addr = pop(cpu);
const val = pop(cpu);
wmem(cpu.mem, addr, val);
case op::PSH =>
rpush(cpu, pop(cpu));
case op::POP =>
push(cpu, rpop(cpu));
case op::HLT =>
cpu.halted = true;
case op::PUT =>
fmt::printfln("{:_04x}",pop(cpu))!;
case => abort("wrong opr");
};
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