compilerfeatures.h

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/*
Copyright 2010-2011, D. E. Shaw Research.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright
  notice, this list of conditions, and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions, and the following disclaimer in the
  documentation and/or other materials provided with the distribution.

* Neither the name of D. E. Shaw Research nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* 
N.B.  When something is added to the list of features, it should be
added to each of the *features.h files, AND to examples/ut_features.cpp.
*/

/* N.B.  most other compilers (icc, nvcc, open64, llvm) will also define __GNUC__, so order matters. */
#if defined(__OPENCL_VERSION__) && __OPENCL_VERSION__ > 0
#include "openclfeatures.h"
#elif defined(__OPEN64__)
#include "open64features.h"
#elif defined(__clang__)
#include "clangfeatures.h"
#elif defined(__GNUC__)
#include "gccfeatures.h"
#elif defined(_MSC_FULL_VER)
#include "msvcfeatures.h"
#else
#error "Can't identify compiler.  You'll need to add a new xxfeatures.hpp"
{ /* maybe an unbalanced brace will terminate the compilation */
#endif

#ifndef R123_USE_CXX11
#define R123_USE_CXX11 (__cplusplus >= 201103L)
#endif

#ifndef R123_USE_CXX11_UNRESTRICTED_UNIONS
#define R123_USE_CXX11_UNRESTRICTED_UNIONS R123_USE_CXX11
#endif

#ifndef R123_USE_CXX11_STATIC_ASSERT
#define R123_USE_CXX11_STATIC_ASSERT R123_USE_CXX11
#endif

#ifndef R123_USE_CXX11_CONSTEXPR
#define R123_USE_CXX11_CONSTEXPR R123_USE_CXX11
#endif

#ifndef R123_USE_CXX11_EXPLICIT_CONVERSIONS
#define R123_USE_CXX11_EXPLICIT_CONVERSIONS R123_USE_CXX11
#endif

#ifndef R123_USE_CXX11_RANDOM
#define R123_USE_CXX11_RANDOM R123_USE_CXX11
#endif

#ifndef R123_USE_CXX11_TYPE_TRAITS
#define R123_USE_CXX11_TYPE_TRAITS R123_USE_CXX11
#endif

#ifndef R123_USE_CXX11_LONG_LONG
#define R123_USE_CXX11_LONG_LONG R123_USE_CXX11
#endif

#ifndef R123_USE_MULHILO64_C99
#define R123_USE_MULHILO64_C99 0
#endif

#ifndef R123_USE_MULHILO64_MULHI_INTRIN
#define R123_USE_MULHILO64_MULHI_INTRIN 0
#endif

#ifndef R123_USE_MULHILO32_MULHI_INTRIN
#define R123_USE_MULHILO32_MULHI_INTRIN 0
#endif

#ifndef R123_STATIC_ASSERT
#if R123_USE_CXX11_STATIC_ASSERT
#define R123_STATIC_ASSERT(expr, msg) static_assert(expr, msg)
#else
    /* if msg always_looked_like_this, we could paste it into the name.  Worth it? */
#define R123_STATIC_ASSERT(expr, msg) typedef char static_assertion[(!!(expr))*2-1]
#endif
#endif

#ifndef R123_CONSTEXPR
#if R123_USE_CXX11_CONSTEXPR
#define R123_CONSTEXPR constexpr
#else
#define R123_CONSTEXPR
#endif
#endif

#ifndef R123_USE_PHILOX_64BIT
#if defined(R123_USE_MULHILO64_ASM) || defined(R123_USE_MULHILO64_MSVC_INTRIN) || defined(R123_USE_MULHILO64_CUDA_INTRIN) || defined(R123_USE_GNU_UINT128) || defined(R123_USE_MULHILO64_C99) || defined(R123_USE_MULHILO64_OPENCL_INTRIN) || defined(R123_USE_MULHILO64_MULHI_INTRIN)
#define R123_USE_PHILOX_64BIT 1
#endif
#endif

#ifndef R123_ULONG_LONG
#if defined(__cplusplus) && !R123_USE_CXX11_LONG_LONG
/* C++98 doesn't have long long.  It doesn't have uint64_t either, but
   we will have typedef'ed uint64_t to something in the xxxfeatures.h.
   With luck, it won't elicit complaints from -pedantic.  Cross your
   fingers... */
#define R123_ULONG_LONG uint64_t
#else
#define R123_ULONG_LONG unsigned long long
#endif
#endif

/* UINT64_C should have been #defined by XXXfeatures.h, either by
   #include <stdint.h> or through compiler-dependent hacks */
#ifndef R123_64BIT
#define R123_64BIT(x) UINT64_C(x)
#endif

#ifndef R123_THROW
#define R123_THROW(x)    throw (x)
#endif

/*
 * Windows.h (and perhaps other "well-meaning" code define min and
 * max, so there's a high chance that our definition of min, max
 * methods or use of std::numeric_limits min and max will cause
 * complaints in any program that happened to include Windows.h or
 * suchlike first.  We use the null macro below in our own header
 * files definition or use of min, max to defensively preclude
 * this problem.  It may not be enough; one might need to #define
 * NOMINMAX before including Windows.h or compile with -DNOMINMAX.
 */
#define R123_NO_MACRO_SUBST