Visual Studio 2013 제대로 파헤쳐 보기!

11월의 주제

C++ 개발자와 함께하는Visual Studio 2013-한국 마이크로소프트 기술 에반젤리스트 김명신 부장

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2014++ 흐름This ISO C++ 개선사이클:

더욱더빠르고예측가능하도록개선

융통성있게 concurrent /decoupled 등을라이브러리를제공하고언어확장도지원

C++ 은살아숨쉬는언어

Lang ExtensionLib buildingLib composabilityBase LibsDomain Libs

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Visual C++는 C++14 을목표로하고있습니다. 그래서 C++11과 C++ 14

를같이구현하고있습니다. 당연히모든표준을구현할것이지만

개발자에게가장가치있는기능부터우선적으로구현하고자합니다.

때문에 generic lambda와같은 C++14의주요기능을 C++11의다른기

능보다우선적으로구현하는경우도있습니다.

Herb Sutter - Microsoft Partner Program Manager

// Initialize elements of an aggregate (array, struct, union)// in any orderunion struct

intintint

struct // .m2==0int

string flip(string s){

reverse(begin(s), end(s));return s;

}

int _tmain(int argc, _TCHAR* argv[]){

vector<future<string>> v;

v.push_back(async([] { return flip(" emocleW"); }));v.push_back(async([] { return flip(" ot"); }));v.push_back(async([] { return flip("\ndlrow ++C wen"); }));

for (auto &e : v){

cout << e.get();}return 0;

}

// C++11class MyClass {

int _size;int *_data;

public:MyClass() : _size(0), _data(nullptr) {}MyClass(int size) : _size(size) {} // 이런 _data 초기화를 누락!!

};// C++14class MyClass {

int _size = 0;int *_data = nullptr;

public:MyClass() {} // _size, _data 이미 초기화MyClass(int size) : _size(size) {} // _data는 이미 초기화

};

클라우드를위한클라이언트서버통신라이브러리

제공되는기능

http://casablanca.codeplex.com

http_client client(L"http://www.myhttpserver.com");

http_request request(methods::GET);

client.request(request).then([](http_response response)

{

// Perform actions here to inspect the HTTP response...

if(response.status_code() == status_codes::OK)

{

}

});

void RequestJSONValue(){

http_client client(L"http://www.myhttpserver.com");client.request(methods::GET).then([](http_response response){

if(response.status_code() == status_codes::OK){

return response.extract_json();}

// Handle error cases, for now return null json value...return task_from_result(json::value());

}).then([](json::value v){

// Perform actions here to process the JSON value...});

}

NuGet손쉬운라이브러리사용

프로젝트경로자동 Update

커뮤니티를통한라이브러리공유방식간소화

http://nuget.codeplex.com

Modern C++ Code EditorScrollbarPeek DefinitionEvent HandlerToggle HeaderFormattingBrace CompletionNavigate-To

Configurable

Automatically Applied

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100

40

0.50

50

100

150

200

First Time Switch (sec) Subsequent Switches (sec)

Time to switch configuration

Visual Studio 2012 Visual Studio 2013

Performance Optimization RecapCompilation Unit Optimizations• /O2 and friends

Whole Program Optimizations• /GL and /LTCG

Profile-Guided Optimizations• /LTCG:PGI and /LTCG:PGO

루프내에서만의 Vectorization을넘어서VS 2012:• 루프내에서만 “vector” instruction 사용

VS 2013 추가• Statement level vectorization

• Permutation of perfect loop nests

• Range propagation optimizations

• Support for more operations: min/max, converts, shifts, byteswap, averaging

• Reductions into array elements

• __restrict support for vector alias checking

• Improvements to data dependence analysis

• C++ pointer vectorization

• Gather / scatter optimizations

for (i = 0; i < 1000; i++) {A[i] = B[i] + C[i];

}

+

r1 r2

r3

add r3, r1, r2

SCALAR(1 operation)

v1 v2

v3+

vectorlength

vadd v3, v1, v2

VECTOR(N operations)

Vector Calling Conventionstruct Particle {

__m256 x;__m256 y;__m256 z;__m256 w;

};Particle __vectorcall foo(Particle a, __m256 scale){Particle t;

t.x = _mm256_mul_ps(a.x, scale);t.y = _mm256_mul_ps(a.y, scale);t.z = _mm256_mul_ps(a.z, scale);t.w = _mm256_mul_ps(a.w, scale);

return t;}

Reduces instruction count

Minimizes stack allocation

Use /Gv for whole module

Improved C++ AMPAvailable in Visual Studio 2012

Visual Studio 2013 추가