Using int index where double is expected in C++ AMP retrict(direct3d) code

Googling didn’t help much, has anyone used AMP?

In the code snippet below the cast from integer to double (double v = idx.x) leads to a “Failed to create shader” run time error. I thought the restrict(direct3d) would have alerted me of things the GPU won’t be able to handle during compile time. Is there an alternative to pow() – or will I have to write a loop to do that?

concurrency::array_view<double,1> prices = …
concurrency::parallel_for_each(
   prices.grid, [=](index<1> idx) mutable restrict(dire开发者_如何学运维ct3d) {
      double v = idx.x;
      prices[idx] =  concurrency::pow(u, v);
…

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please see our explanation of double support for GPUs on Windows, and also the C++ AMP math library http://blogs.msdn.com/b/nativeconcurrency/archive/2012/02/08/math-library-for-c-amp.aspx http://blogs.msdn.com/b/nativeconcurrency/archive/2012/02/07/double-precision-support-in-c-amp.aspx

If you still have a question, feel free to post back. Also please tag your questions with c++amp so we have a better chance of finding them.