/*
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.
*/
#ifndef __r123_nvcc_features_dot_h__
#define __r123_nvcc_features_dot_h__

#if !defined(CUDART_VERSION)
#error "why are we in nvccfeatures.h if CUDART_VERSION is not defined"
#endif

#if CUDART_VERSION < 4010
#error "CUDA versions earlier than 4.1 produce incorrect results for some templated functions in namespaces.  Random123 isunsupported.  See comments in nvccfeatures.h"
// This test was added in Random123-1.08 (August, 2013) because we
// discovered that Ftype(maxTvalue<T>()) with Ftype=double and
// T=uint64_t in examples/uniform.hpp produces -1 for CUDA4.0 and
// earlier.  We can't be sure this bug doesn't also affect invocations
// of other templated functions, e.g., essentially all of Random123.
// Thus, we no longer trust CUDA versions earlier than 4.1 even though
// we had previously tested and timed Random123 with CUDA 3.x and 4.0.
// If you feel lucky or desperate, you can change #error to #warning, but
// please take extra care to be sure that you are getting correct
// results.
#endif

// nvcc falls through to gcc or msvc.  So first define
// a couple of things and then include either gccfeatures.h
// or msvcfeatures.h

//#ifdef  __CUDA_ARCH__ allows Philox32 and Philox64 to be compiled
//for both device and host functions in CUDA by setting compiler flags
//for the device function
#ifdef  __CUDA_ARCH__
#ifndef R123_CUDA_DEVICE
#define R123_CUDA_DEVICE __device__
#endif

#ifndef R123_USE_MULHILO64_CUDA_INTRIN
#define R123_USE_MULHILO64_CUDA_INTRIN 1
#endif

#ifndef R123_THROW
// No exceptions in CUDA, at least upto 4.0
#define R123_THROW(x)    R123_ASSERT(0)
#endif

#ifndef R123_ASSERT
#define R123_ASSERT(x) if((x)) ; else asm("trap;")
#endif

#else // ! __CUDA_ARCH__
// If we're using nvcc not compiling for the CUDA architecture,
// then we must be compiling for the host.  In that case,
// tell the philox code to use the mulhilo64 asm because
// nvcc doesn't grok uint128_t.
#ifndef R123_USE_MULHILO64_ASM
#define R123_USE_MULHILO64_ASM 1
#endif

#endif // __CUDA_ARCH__

#ifndef R123_BUILTIN_EXPECT
#define R123_BUILTIN_EXPECT(expr,likely) expr
#endif

#ifndef R123_USE_AES_NI
#define R123_USE_AES_NI 0
#endif

#ifndef R123_USE_SSE4_2
#define R123_USE_SSE4_2 0
#endif

#ifndef R123_USE_SSE4_1
#define R123_USE_SSE4_1 0
#endif

#ifndef R123_USE_SSE
#define R123_USE_SSE 0
#endif

#ifndef R123_USE_GNU_UINT128
#define R123_USE_GNU_UINT128 0
#endif

#ifndef R123_ULONG_LONG
// uint64_t, which is what we'd get without this, is
// not the same as unsigned long long
#define R123_ULONG_LONG unsigned long long
#endif

#if defined(__GNUC__)
#include "gccfeatures.h"
#elif defined(_MSC_FULL_VER)
#include "msvcfeatures.h"
#endif

#endif
