[vsipl++] [patch] Some enhancements to the FFT code.

[Stefan Seefeld]

Jules Bergmann wrote:

> I'm not sure if the mercury FFTs have any stated alignment requirements 
> for their temporary buffer, but to be safe we should allocate with 
> either a 16-byte (altivec) or 32-byte (cache line) alignment using the 
> alloc_aligned function.

Ok, I use alloc_align(32, ...) for now. (Various backends may have their
own optimized memory management routines, so this has to be revisited later.)

I took the occasion to apply a patch to the alloc_align function which
we had discussed many moons ago. It is now parametrized, i.e. instead of

double *array = static_cast<double *>(alloc_align(32, 1024 * sizeof(double)));

you simply write

double *array = alloc_align<double>(32, 1024);

I adjusted all the code that uses alloc_align accordingly (and fixed a
long-standing issue with paths in some sarsim-related scripts). The attached
patch is checked in.

Regards,
		Stefan
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