core.simd 3 operand instructions?

[jerro]

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) 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)