Oliver Hunt wrote:
On Jul 25, 2013, at 12:11 PM, Waldemar Horwat <[email protected]
<mailto:[email protected]>> wrote:
On Thu, Jul 25, 2013 at 12:00 PM, Brendan Eich<[email protected]
<mailto:[email protected]>>wrote
Michael Haufe wrote:
In 2008 I first proposed the addition of an integer division
operator to the language. At the time Brendan noted his
regret for this oversight and desire for the operator as
well. I am not seeing this operator available in the current
draft. Can/will this be rectified?
a div b = (a - a % b) / b
This turns out to be equivalent to
(a/b)|0
which is how asm.js optimizes to avoid the FPU already.
It's not equivalent for values greater than 2^31. The | version wraps
around; div would give the correct answer.
I presume brendan meant
((a|0/b|0)|0)
Which seems to be the asm.js way -- although that said, there
shouldn't be any requirement on a compile flag to tell us what we can
simply turn this into an idiv...
There's no need, right. My "asm.js optimizes" was about the type system
at http://asmjs.org/ -- not about any JS change or VM flag or whatever.
And yes, to Waldemar's point, this is for int32.
Michael, were you looking for integer-domain double div? I suppose we
were back in 2008. It's still missing.
/be
--Oliver
Waldemar
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