Question about Vectors

[Marco Leise via Digitalmars-d-learn]

Am Thu, 20 Nov 2014 20:17:31 +0000
schrieb "Charles" <csmith.ku2013 at gmail.com>:

> So I was reading the documentation page: 
> http://dlang.org/simd.html and noticed what appears to be a typo:
> 
> int4 v;
> (cast(int*)&v)[3] = 2;   // set 3rd element of the 4 int vector
> (cast(int[4])v)[3] = 2;  // set 3rd element of the 4 int vector
> v.array[3] = 2;          // set 3rd element of the 4 int vector
> v.ptr[3] = 2;            // set 3rd element of the 4 int vector
> 
> v.array[3] = 2; and v.ptr[3] = 2; set the fourth element, and not 
> the third.
> 
> As I was verifying this, I realized I had to compile it in 64 bit 
> code. The 32 bit code produced the error "SIMD vector types not 
> supported on this platform".
> 
> My test code is:
> 
>      void main() {
>          import std.stdio;
>          import core.simd;
> 
>          int4 v = 7;
>          v.ptr[3] = 2;
>          writeln(v.array[]);
>      }
> 
> 
> Is that related to me compiling while using a 64 bit OS, or is 
> that true of any 32 bit OS, and thus, vectors can't be used in 
> programs intended to be run on 32 bit OSs?
> 
> Thanks,
> Charles

DMD supports SIMD only on amd64, but you can use the GDC or
LDC2 compilers if you need 32-bit support for vector types.

-- 
Marco