[Vm-dev] Re: [squeak-dev] Spur with Immediate Floating Point
Support implies a break
Eliot Miranda
eliot.miranda at gmail.com
Thu Dec 4 18:22:46 UTC 2014
Hi Nicolas,
On Dec 4, 2014, at 1:51 AM, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:
>
>
> 2014-12-04 0:08 GMT+01:00 Levente Uzonyi <leves at elte.hu>:
>> On Mon, 1 Dec 2014, Eliot Miranda wrote:
>>
>>> I was assuming that any of add or subtract positive or negative zero, or multiply or divide by 1.0 would do the trick. Why wouldn't this be
>>> adequate?
>>
>> I think "x + 0.0" is adequate, but unnatural. It reminds me of javascript's typecast hacks.
>
> No, it's not, it would transform a negative zero into a positive one...
> Maybe x - 0.0
What does x * 1.0 do to negative zero?
>
>>> Ah, I see. Hang on. There is no support for SmallFloat64 on 32-bit Spur.
>>> Only in a 64-bit image/on a 64-bit Spur VM will you be able to create
>>> instances of SmallFloat64. And so far I only have this working in the VM
>>> simulator. I've yet to try and create a real VM, and even then it will
>>> only be a Stack VM.
>>
>> Wouldn't it be possible to support them in a 32-bit VM? Aren't object headers the same in both VMs? Or is it because of the difference in alignment?
>>
>> Levente
>
>
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