package sim_8086

import "core:os"
import "core:fmt"
import "core:math"
import "core:strings"

execute_instruction :: proc(inst: Instruction) {
    #partial switch inst.opname {
        case .MOV:
        if reg_id,ok := inst.dst.(RegisterId); ok {
            // val := registers[reg_id.id].value.full
            #partial switch val in inst.src {
            case Immediate:
                if val.size == .Signed16 {
                    registers[reg_id.id].value.full = (u16)(val.value)
                } else {
                    value := u8(val.value & 0xFF)
                    if reg_id.access == .Low {
                        registers[reg_id.id].value.low  = value
                    } else {
                        registers[reg_id.id].value.high  = value
                    }
                }
            case RegisterId:
                switch val.access {
                case .Low, .High:
                    value := val.access == .Low ? registers[val.id].value.low : registers[val.id].value.high
                    if reg_id.access == .Low {
                        registers[reg_id.id].value.low = value
                    } else {
                        registers[reg_id.id].value.high = value
                    }
                case .Full:
                    registers[reg_id.id].value.full = registers[val.id].value.full
                }
            }
        }
    }
}