Math.imul support was just added to the v8 trunk: https://code.google.com/p/v8/source/detail?r=14450. Is there any ongoing effort to standardize it?
On Fri, Nov 2, 2012 at 9:24 PM, Brendan Eich <bren...@mozilla.org> wrote: > David Herman wrote: >> >> On Nov 2, 2012, at 12:05 PM, Yehuda Katz<wyc...@gmail.com> wrote: >> >>> Seems like a small surface-area with a large impact on compilers. >>> >>> At first glance, looks good to me. >>> >>> Curiosity: Does this overlap with Brendan's work on value objects (i.e. >>> will it become moot in the face of them) >> >> >> It could become unnecessary if you're working with value objects. If you >> had ordinary numbers, you'd have to coerce them to u32 and then multiply: >> >> var a = 0x7fffffff, b = 0x7fefefef; // both doubles >> var result = int32(a) * int32(b); // int32 >> >> But value objects are still uncertain > > > I'm focusing on int64 and uint64 but making the framework as general under > the hood as possible (e.g., the operators stuff, a multimethod variation > that's inline-cacheable, based on an idea from Christian Plesner Hansen). > > The need for 64-bit ints is pretty strong in Node.js and I think this means > value objects are a priority for ES7. > > >> and at the very least much farther off into the future -- post-ES6. >> Engines could implement and ship Math.imul in very short order. > > > Agreed, and this kind of micro-evolution is important to support even while > working on value objects for post-ES6. It may be we end up with int32 and > uint32, but we don't need to if there's no strong use-case not satisfied by > Math.imul. > > Note that there's no micro-evolutionary step involving Math.imul64 that > satisfies the int64/uint64 use-cases Node faces (buffer and file > sizes/offsets). You need 64-bit addition, subtraction, and probably other > operators -- and you need the data type, not just operations that could be > Math methods. > > /be > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
