nes-emu/cpu/instructions/logical.js

A NES emulator

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
const instructions = () => [
/**
 * Logical AND
 *
 * Performs a "bit by bit" logical AND between A and `value`, storing
 * the result in A and setting the Z (zero) and N (negative) flags.
 */
{
  id: "AND",
  needsValue: true,
  execute: LOGICAL_INSTRUCTION((one, another) => one & another)
},
/**
 * Exclusive OR
 *
 * Performs a "bit by bit" exclusive OR between A and `value`, storing
 * the result in A and setting the Z (zero) and N (negative) flags.
 */
{
  id: "EOR",
  needsValue: true,
  execute: LOGICAL_INSTRUCTION((one, another) => one ^ another)
},
/**
 * Logical Inclusive OR
 *
 * Performs a "bit by bit" logical inclusive OR between A and `value`, storing
 * the result in A and setting the Z (zero) and N (negative) flags.
 */
{
  id: "ORA",
  needsValue: true,
  execute: LOGICAL_INSTRUCTION((one, another) => one | another)
}];
const LOGICAL_INSTRUCTION = operator => {
  return (_ref, value) => {
    let {
      cpu
    } = _ref;
    const result = operator(cpu.registers.a.value, value);
    cpu.registers.a.value = result;
    cpu.flags.updateZeroAndNegative(result);
  };
};
var _default = exports.default = instructions();