SIMD/intrinsincs questions

[Robert Jacques]

On Sun, 08 Nov 2009 17:47:31 -0500, Lutger <lutger.blijdestijn at gmail.com>  
wrote:

> Mike Farnsworth wrote:
>
> ...
>>
>> Of course, there are some operations that the available SSE intrinsics
>> cover that the compiler can't expose via the typical operators, so those
>> still need to be supported somehow.  Does anyone know if ldc or dmd has
>> those, or if they'll optimize away SSE loads and stores if I roll my own
>> structs with asm blocks?  I saw from the ldc source it had the usual  
>> llvm
>> intrinsics, but as far as hardware-specific codegen intrinsics I  
>> couldn't
>> spot any.
>>
>> Thanks,
>> Mike Farnsworth
>>
>
> Have you seen this page?
> http://www.dsource.org/projects/ldc/wiki/InlineAsmExpressions
>
> This is similar to gcc's (gdc has it too) extended inline asm  
> expressions.
> I'm not at all in the know about all this, but I think this will allow  
> you
> to built something yourself that works well with the optimizations done  
> by
> the compiler. If someone could clarify how these inline expressions work
> exactly, that would be great.

SSE intrinsics allow you to specify the operation, but allow the compiler  
to do the register assignments, inlining, etc. D's inline asm requires the  
programmer to manage everything.