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//
// 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 NVIDIA CORPORATION 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 ``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.
//
// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#ifndef PSFOUNDATION_PSUNIXINTRINSICS_H
#define PSFOUNDATION_PSUNIXINTRINSICS_H
#include "Ps.h"
#include "foundation/PxAssert.h"
#include <math.h>
#if PX_ANDROID || (PX_LINUX && !(PX_X64 || PX_X64)) // x86[_64] Linux uses inline assembly for debug break
#include <signal.h> // for Ns::debugBreak() { raise(SIGTRAP); }
#endif
#if 0
#include <libkern/OSAtomic.h>
#endif
// this file is for internal intrinsics - that is, intrinsics that are used in
// cross platform code but do not appear in the API
#if !(PX_LINUX || PX_ANDROID || PX_PS4 || PX_APPLE_FAMILY)
#error "This file should only be included by unix builds!!"
#endif
namespace physx
{
namespace shdfnd
{
PX_FORCE_INLINE void memoryBarrier()
{
__sync_synchronize();
}
/*!
Return the index of the highest set bit. Undefined for zero arg.
*/
PX_INLINE uint32_t highestSetBitUnsafe(uint32_t v)
{
return 31 - __builtin_clz(v);
}
/*!
Return the index of the highest set bit. Undefined for zero arg.
*/
PX_INLINE int32_t lowestSetBitUnsafe(uint32_t v)
{
return __builtin_ctz(v);
}
/*!
Returns the index of the highest set bit. Returns 32 for v=0.
*/
PX_INLINE uint32_t countLeadingZeros(uint32_t v)
{
if(v)
return __builtin_clz(v);
else
return 32;
}
/*!
Prefetch aligned 64B x86, 32b ARM around \c ptr+offset.
*/
PX_FORCE_INLINE void prefetchLine(const void* ptr, uint32_t offset = 0)
{
__builtin_prefetch(reinterpret_cast<const char* PX_RESTRICT>(ptr) + offset, 0, 3);
}
/*!
Prefetch \c count bytes starting at \c ptr.
*/
#if PX_ANDROID || PX_IOS
PX_FORCE_INLINE void prefetch(const void* ptr, uint32_t count = 1)
{
const char* cp = static_cast<const char*>(ptr);
size_t p = reinterpret_cast<size_t>(ptr);
uint32_t startLine = uint32_t(p >> 5), endLine = uint32_t((p + count - 1) >> 5);
uint32_t lines = endLine - startLine + 1;
do
{
prefetchLine(cp);
cp += 32;
} while(--lines);
}
#else
PX_FORCE_INLINE void prefetch(const void* ptr, uint32_t count = 1)
{
const char* cp = reinterpret_cast<const char*>(ptr);
uint64_t p = size_t(ptr);
uint64_t startLine = p >> 6, endLine = (p + count - 1) >> 6;
uint64_t lines = endLine - startLine + 1;
do
{
prefetchLine(cp);
cp += 64;
} while(--lines);
}
#endif
//! \brief platform-specific reciprocal
PX_CUDA_CALLABLE PX_FORCE_INLINE float recipFast(float a)
{
return 1.0f / a;
}
//! \brief platform-specific fast reciprocal square root
PX_CUDA_CALLABLE PX_FORCE_INLINE float recipSqrtFast(float a)
{
return 1.0f / ::sqrtf(a);
}
//! \brief platform-specific floor
PX_CUDA_CALLABLE PX_FORCE_INLINE float floatFloor(float x)
{
return ::floorf(x);
}
#define NS_EXPECT_TRUE(x) x
#define NS_EXPECT_FALSE(x) x
} // namespace shdfnd
} // namespace physx
#endif // #ifndef PSFOUNDATION_PSUNIXINTRINSICS_H
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