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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) 2008-2021 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_PSWINDOWSINTRINSICS_H
- #define PSFOUNDATION_PSWINDOWSINTRINSICS_H
-
- #include "Ps.h"
- #include "foundation/PxAssert.h"
-
- // 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_WINDOWS_FAMILY
- #error "This file should only be included by Windows builds!!"
- #endif
-
- #pragma warning(push)
- //'symbol' is not defined as a preprocessor macro, replacing with '0' for 'directives'
- #pragma warning(disable : 4668)
- #if PX_VC == 10
- #pragma warning(disable : 4987) // nonstandard extension used: 'throw (...)'
- #endif
- #include <intrin.h>
- #pragma warning(pop)
-
- #pragma warning(push)
- #pragma warning(disable : 4985) // 'symbol name': attributes not present on previous declaration
- #include <math.h>
- #pragma warning(pop)
-
- #include <float.h>
- // do not include for ARM target
- #if !PX_ARM && !PX_A64
- #include <mmintrin.h>
- #endif
-
- #pragma intrinsic(_BitScanForward)
- #pragma intrinsic(_BitScanReverse)
-
- namespace physx
- {
- namespace shdfnd
- {
-
- /*
- * Implements a memory barrier
- */
- PX_FORCE_INLINE void memoryBarrier()
- {
- _ReadWriteBarrier();
- /* long Barrier;
- __asm {
- xchg Barrier, eax
- }*/
- }
-
- /*!
- Returns the index of the highest set bit. Not valid for zero arg.
- */
- PX_FORCE_INLINE uint32_t highestSetBitUnsafe(uint32_t v)
- {
- unsigned long retval;
- _BitScanReverse(&retval, v);
- return retval;
- }
-
- /*!
- Returns the index of the highest set bit. Undefined for zero arg.
- */
- PX_FORCE_INLINE uint32_t lowestSetBitUnsafe(uint32_t v)
- {
- unsigned long retval;
- _BitScanForward(&retval, v);
- return retval;
- }
-
- /*!
- Returns the number of leading zeros in v. Returns 32 for v=0.
- */
- PX_FORCE_INLINE uint32_t countLeadingZeros(uint32_t v)
- {
- if(v)
- {
- unsigned long bsr = (unsigned long)-1;
- _BitScanReverse(&bsr, v);
- return 31 - bsr;
- }
- else
- return 32;
- }
-
- /*!
- Prefetch aligned cache size around \c ptr+offset.
- */
- #if !PX_ARM && !PX_A64
- PX_FORCE_INLINE void prefetchLine(const void* ptr, uint32_t offset = 0)
- {
- // cache line on X86/X64 is 64-bytes so a 128-byte prefetch would require 2 prefetches.
- // However, we can only dispatch a limited number of prefetch instructions so we opt to prefetch just 1 cache line
- /*_mm_prefetch(((const char*)ptr + offset), _MM_HINT_T0);*/
- // We get slightly better performance prefetching to non-temporal addresses instead of all cache levels
- _mm_prefetch(((const char*)ptr + offset), _MM_HINT_NTA);
- }
- #else
- PX_FORCE_INLINE void prefetchLine(const void* ptr, uint32_t offset = 0)
- {
- // arm does have 32b cache line size
- __prefetch(((const char*)ptr + offset));
- }
- #endif
-
- /*!
- Prefetch \c count bytes starting at \c ptr.
- */
- #if !PX_ARM
- PX_FORCE_INLINE void prefetch(const void* ptr, uint32_t count = 1)
- {
- const char* cp = (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);
- }
- #else
- PX_FORCE_INLINE void prefetch(const void* ptr, uint32_t count = 1)
- {
- const char* cp = (char*)ptr;
- uint32_t p = size_t(ptr);
- uint32_t startLine = p >> 5, endLine = (p + count - 1) >> 5;
- uint32_t lines = endLine - startLine + 1;
- do
- {
- prefetchLine(cp);
- cp += 32;
- } 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_PSWINDOWSINTRINSICS_H