On Friday, 2 November 2012 at 10:50:56 UTC, Jens Mueller wrote:
Don Clugston wrote:
On 02/11/12 10:01, Jens Mueller wrote:
>Jacob Carlborg wrote:
>>On 2012-11-01 23:51, Walter Bright wrote:
>>
>>>What about all your feature requests? I think you've made
>>>more than
>>>anyone, by a factor of 10 at least!
>>>
>>>:-)
>>>
>>>As for Manu's request
>>>
>>>http://d.puremagic.com/issues/show_bug.cgi?id=8108
>>>
>>>I've gone over with him why he needs it, and there's no
>>>other reasonable
>>>way. He needs it for real code in a real application.
>>
>>This is quite interesting. Manu comes in from basically
>>nowhere and
>>fairly quickly manage to convince Walter to implement at
>>least two
>>feature requests, this one and the SIMD support. I'm not
>>saying that
>>they shouldn't have been implemented. Although I think
>>something
>>like AST macros could possible solve issue 8108 and a whole
>>bunch of
>>other features, a few already present in the language.
>
>I had the same thought when reading this. Very disappointing.
>An issue
>with zero votes is fixed instead of more important ones. Why
>do I vote
>anyway?
>Regarding SIMD I have the feeling that because it is built
>into the
>compiler static vectors have actually failed what they
>promised. I
>thought D proposed a portable way of vector operations such
>that you
>write
>float[4] = a[] + b[]
>and the compiler generates SIMD code for you.
Not for short vectors. They are more like the builtin
operations in
Fortran, ie designed for large vectors. More for scientific
kinds of
applications than games. (The two applications look
superficially
similar, but in practice they have little in common).
Okay. For me they look the same. Can you elaborate, please?
Assume I
want to add two float vectors which is common in both games and
scientific computing. The only difference is in games their
length is
usually 3 or 4 whereas in scientific computing they are of
arbitrary
length. Why do I need instrinsics to support the game setting?
Jens
The auto vectorization code in Visual Studio 2012 seems to work
pretty well.
