• Trass3r (30/30) Nov 16 2009 Well, OpenCL requires all types to be naturally aligned.
• bearophile (4/8) Nov 17 2009 Show this problem in the main D newsgroup and ask for align(n) to work o...
• Trass3r (2/4) Nov 17 2009 Thank you, I've done so.

Trass3r <mrmocool gmx.de> writes:

Well, OpenCL requires all types to be naturally aligned.

The D specs state:
"AlignAttribute is ignored when applied to declarations that are not 
struct members."

Could there arise any problems translating the following

/*
  * Vector types
  *
  *  Note:   OpenCL requires that all types be naturally aligned.
  *          This means that vector types must be naturally aligned.
  *          For example, a vector of four floats must be aligned to
  *          a 16 byte boundary (calculated as 4 * the natural 4-byte
  *          alignment of the float).  The alignment qualifiers here
  *          will only function properly if your compiler supports them
  *          and if you don't actively work to defeat them.  For example,
  *          in order for a cl_float4 to be 16 byte aligned in a struct,
  *          the start of the struct must itself be 16-byte aligned.
  *
  *          Maintaining proper alignment is the user's responsibility.
  */

typedef double          cl_double2[2]   __attribute__((aligned(16)));
typedef double          cl_double4[4]   __attribute__((aligned(32)));
typedef double          cl_double8[8]   __attribute__((aligned(64)));
typedef double          cl_double16[16] __attribute__((aligned(128)));



into just


alias double[2]		cl_double2;
alias double[4]		cl_double4;
alias double[8]		cl_double8;
alias double[16]	cl_double16;

?

bearophile <bearophileHUGS lycos.com> writes:

Trass3r:
 typedef double          cl_double2[2]   __attribute__((aligned(16)));
 typedef double          cl_double4[4]   __attribute__((aligned(32)));
 typedef double          cl_double8[8]   __attribute__((aligned(64)));
 typedef double          cl_double16[16] __attribute__((aligned(128)));

Show this problem in the main D newsgroup and ask for align(n) to work on
stack-allocated arrays/structs too.

Bye,
bearophile

Trass3r <mrmocool gmx.de> writes:

bearophile schrieb:
 Show this problem in the main D newsgroup and ask for align(n) to work on
stack-allocated arrays/structs too.
 

Thank you, I've done so.