Martin@438: // empty line needed here
Martin@445: Number.prototype.add32 = function(x) { return (this + x) | 0; };
Martin@445: Number.prototype.sub32 = function(x) { return (this - x) | 0; };
Martin@445: Number.prototype.mul32 = function(x) { 
Martin@445:     return (((this * (x >> 16)) << 16) + this * (x & 0xFFFF)) | 0;
Martin@438: };
Martin@439: 
Martin@445: Number.prototype.toInt8 = function()  { return (this << 24) >> 24; };
Martin@582: Number.prototype.toInt16 = function() { return (this << 16) >> 16; };
Martin@582: 
Martin@594: Number.prototype.next32 = function(low) {
Martin@594:   if (this === 0) {
Martin@594:     return low;
Martin@594:   }
Martin@594:   var l = new Number(low);
Martin@594:   l.hi = this;
Martin@594:   return l;
Martin@582: };
Martin@582: 
Martin@594: Number.prototype.high32 = function() { 
Martin@594:     return this.hi ? this.hi : (Math.floor(this / 0xFFFFFFFF)) | 0;
Martin@594: };
Martin@594: Number.prototype.toInt32 = function() { return this | 0; };
Martin@594: Number.prototype.toFP = function() {
Martin@594:     return this.hi ? this.hi * 0xFFFFFFFF + this : this;
Martin@594: };
Martin@594: Number.prototype.toLong = function() {
Martin@594:     var hi = (this > 0xFFFFFFFF) ? (Math.floor(this / 0xFFFFFFFF)) | 0 : 0;
Martin@594:     return hi.next32(this % 0xFFFFFFFF);
Martin@594: }
Martin@594: 
Martin@594: Number.prototype.add64 = function(x) {
Martin@594:     var low = this + x;
Martin@594:     carry = 0;
Martin@594:     if (low > 0xFFFFFFFF) {
Martin@594:         carry = 1;
Martin@594:         low -= 0xFFFFFFFF;  // should not here be also -1?
Martin@594:     }
Martin@594:     var hi = (this.high32() + x.high32() + carry) & 0xFFFFFFFF;
Martin@594:     return hi.next32(low);
Martin@582: };
Martin@582: 
Martin@594: Number.prototype.div64 = function(x) {
Martin@594:     var low = Math.floor(this.toFP() / x.toFP()); // TODO: not exact enough
Martin@594:     if (low > 0xFFFFFFFF) {
Martin@594:         var hi = Math.floor(low / 0xFFFFFFFF) | 0;
Martin@594:         return hi.next32(low % 0xFFFFFFFF);
Martin@582:     }
Martin@594:     return low;
Martin@582: };
Martin@582: 
Martin@594: Number.prototype.shl64 = function(x) {
Martin@594:     if (x > 32) {
Martin@594:         var hi = (this << (x - 32)) & 0xFFFFFFFF;
Martin@594:         return hi.next32(0);
Martin@594:     } else {
Martin@594:         var hi = (this.high32() << x) & 0xFFFFFFFF;
Martin@594:         var low_reminder = this >> x;
Martin@594:         hi |= low_reminder;
Martin@594:         var low = this << x;
Martin@594:         return hi.next32(low);
Martin@594:     }
Martin@582: };
Martin@582: 
Martin@594: Number.prototype.compare64 = function(x) {
Martin@582:     if (this.hi == x.hi) {
Martin@594:         return (this == x) ? 0 : ((this < x) ? -1 : 1);
Martin@582:     }
Martin@582:     return (this.hi < x.hi) ? -1 : 1;
Martin@582: };