Hello C ++ AMP! (2)

Matrix operations may not be important to most programmers, so the following is a more popular version of AMP:

 1 #include <iostream>
 2 #include <amp.h>
 3 
 4  int main()
 5  {
 6      int nickName[6]{'a', 96, 'd', 'r', 'j', 'x'};
 7      concurrency::array_view<int> myView(6, nickName);
 8      concurrency::parallel_for_each(myView.extent,
 9          [=] (concurrency::index<1> idx) restrict(amp)
10      {
11          myView[idx] += 1;
12      }
13      );
14      for(int i = 0; i<6; ++i)
15         std::cout<<(char)myView[i];
16      return 0;
17  }

Do you know what the input is before running? First, let's talk about the meaning of the answer ".

First, you cannot compile it. Because Line 6 uses the initialization method in c ++ 11. By default, compilation fails.

int nickName[6] = {'a', 96, 'd', 'r', 'j', 'x'};

Yes. Currently, vs11 does not support initialize list.

Next, you may ask why nickName is of the int type instead of char type. The most straightforward answer is that array_view does not support char, at least int.

For details, see the statement of array_view:

Template <typename _ Value_type, int _ Rank = 1>
Class array_view: public _ Array_view_base <_ Rank, sizeof (_ Value_type)/sizeof (int)>
{
// The code is omitted for ease of reading
}

As mentioned in the previous article, array_view reiterated that it is similar to an iterator in general. It provides the index interface required for parallel_for_each.

Restrict is a non-reserved character. It only works in the current context. This "prompt" tells the compiler what program the programmer intends to generate. Is it cpu or amp, which means to use the accelerator.

What is an accelerator )? It is another device that supports parallel computing, such as your graphics GPU, and other vector processors that support SIMD, such as those that you use the OS driver to simulate. In addition, the predecessor of the early amp is the string "direct3d", which is now replaced with the amp. Don't be surprised if you see direct3d.

Kernel is the code to run on the accelerator.

In this example, the kernel is as follows:

myView[idx] += 1;

Obviously, it is for all the characters of myNickName + 1. Now you should understand what is output?

The following shows the VS11 support for c ++ 11 (visual studio only $ _ $ ):

C ++ 11 Core Language Features	VC10	VC11
Rvalue references v0.1, v1.0, v2.0, v2.1, v3.0	V2.0	V2.1 *
Ref-qualifiers	No	No
Non-static data member initializers	No	No
Variadic templates v0.9, v1.0	No	No
Initializer lists	No	No
Static_assert	Yes	Yes
Auto v0.9, v1.0	V1.0	V1.0
Trailing return types	Yes	Yes
Lambdas v0.9, v1.0, v1.1	V1.0	V1.1
Decltype v1.0, v1.1	V1.0	V1.1 **
Right angle brackets	Yes	Yes
Default template arguments for function templates	No	No
Expression SFINAE	No	No
Alias templates	No	No
Extern templates	Yes	Yes
Nullptr	Yes	Yes
Stronugly typed enums	Partial	Yes
Forward declared enums	No	Yes
Attributes	No	No
Constexpr	No	No
Alignment	TR1	Partial
Delegating constructors	No	No
Inheriting constructors	No	No
Explicit conversion operators	No	No
Char16_t and char32_t	No	No
Unicode string literals	No	No
Raw string literals	No	No
Universal character names in literals	No	No
User-defined literals	No	No
Standard-layout and trivial types	No	Yes
Defaulted and deleted functions	No	No
Extended friend declarations	Yes	Yes
Extended sizeof	No	No
Inline namespaces	No	No
Unrestricted unions	No	No
Local and unnamed types as template arguments	Yes	Yes
Range-based for-loop	No	Yes
Override and final v0.8, v0.9, v1.0	Partial	Yes
Minimal GC support	Yes	Yes
Notest	No	No

 

C ++ 11 Core Language Features: Concurrency	VC10	VC11
Reworded sequence points	N/	N/
Atomics	No	Yes
Strong compare and exchange	No	Yes
Bidirectional fences	No	Yes
Memory model	N/	N/
Data-dependency ordering	No	Yes
Data-dependency ordering: function annotation	No	No
Prediction_ptr	Yes	Yes
Quick_exit and at_quick_exit	No	No
Atomics in signal handlers	No	No
Thread-local storage	Partial	Partial
Magic statics	No	No

 

C ++ 11 Core Language Features: C99	VC10	VC11
_ Func __	Partial	Partial
C99 preprocessor	Partial	Partial
Long	Yes	Yes
Extended integer types	N/	N/