core.simd 3 operand instructions?

[Manu]

On 7 September 2012 09:05, jerro <a at a.com> wrote:

> On Friday, 7 September 2012 at 05:56:19 UTC, jerro wrote:
>
>> On Thursday, 6 September 2012 at 19:21:22 UTC, Benjamin Thaut wrote:
>>
>>> Looking at core.simd I noticed that all simd instructions that take 3
>>> operands (usually two operands and some kind of constant third value), are
>>> commented out for the opcodes. Most likely because __simd() does not have a
>>> 4th parameter which could be used to pass in the additional value for some
>>> of the opcodes.
>>>
>>> Are there plans to fix this? Because for example the shuffle
>>> instructions are pretty important (try doing a cross product without simd
>>> shuffle instructions...)
>>>
>>> Kind Regards
>>> Benjamin Thaut
>>>
>>
>> I can't answer your question, but if you are using GDC, you could use gcc
>> builtins . They have the same names as in GCC - take a look at *mmintrin.h
>> files to find out SSE builtin names). For LDC, you could use pragma
>> intrinsic(http://www.dsource.**org/projects/ldc/wiki/Docs<http://www.dsource.org/projects/ldc/wiki/Docs>)
>> and pragma shufflevector. You declare function that you want to compile to
>> llvm shufflevector instruction like this:
>>
>> pragma(shufflevector)
>>     float4 shufflevector(float4, float4, int, int, int, int);
>>
>> Then shufflevector() is used in the same way as Clang's
>> __builtin_shufflevector (http://clang.llvm.org/docs/**
>> LanguageExtensions.html#__**builtin_shufflevector<http://clang.llvm.org/docs/LanguageExtensions.html#__builtin_shufflevector>
>> )
>>
>
> I forgot to mention Manu's std.simd (https://github.com/TurkeyMan/**
> phobos/blob/master/std/simd.d<https://github.com/TurkeyMan/phobos/blob/master/std/simd.d>
> )**. It is supposed to be wrapper around compiler specific intrinsics. If
> your are using SIMD mostly for operation on geometric vectors, it should
> fit your use case well (for example, it already includes a cross3
> function). It currently only really supports GDC, though.
>

Yeah, it's kinda waiting for the missing bits from DMD before I can finish
it off.
GDC is pretty close, though there are some missing fallback paths for the
operations that have efficient SSE4.1 opcodes (which should also implement
an SSE2 fallback path).
I started preliminary ARM support too, and I got LDC building recently, so
I might add that in soon.

I don't think it's purely for geometry, all the integer stuff is there,
along with permutation and saturating integer operations. But it certainly
offers a lot of helpers for geometry work.
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