Java > Scala

[Jude]

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On 11/30/2011 03:33 PM, Timon Gehr wrote:
> On 11/30/2011 09:56 PM, Paulo Pinto wrote:
>> Are you not being a bit simplistic here?
>> 
>> There are several JVM implementations around not just one.
>> 
> 
> Where did he talk about implementations? He only described the
> _design_ of the JVM.
> 
>> Plus if I understand correctly some complains of people using D
>> in real projects, in many cases JVM JITs are able to generate
>> better code than D. At least for the time being.
>> 
> 
> Nope. (Even when interpreting 'D' as 'DMD'). Except when the D code
> is written badly.
> 

there was recently a test case where D outperformed C++.

I would be VERY surprised if a JVM JIT could outperform D, excepting
the occasional corner case of course.

I'd love to see any tests that prove that JIT could generally generate
better code.

>> 

>>> I used to be intimately familiar with the JVM, I even wrote a
>>> gc for it. The bytecode ops in it are designed for Java,
>>> nothing more. Worse, it's a primitive stack machine. To
>>> generate even passably good native code, the JVM has to do a
>>> lot of reverse engineering of the bytecode.
>>> 
>>> For example, you cannot pass by value anything other than the
>>> primitive Java data types. There are no pointers. Want an
>>> unsigned int? Forget it. Arrays of anything but class
>>> references? Nyuk nyuk nyuk. Etc.
>>> 
>> 
> 
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