Revision control
++ // Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
++ // Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
++ // SPDX-FileCopyrightText: Copyright (c) 2008-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
++ // SPDX-License-Identifier: Apache-2.0
++
++ #ifndef PX_WINDOWS_INTRINSICS_H
++ #define PX_WINDOWS_INTRINSICS_H
++
++ #include "foundation/PxAssert.h"
++ #include <string.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 intrinsic(memcmp)
++ #pragma intrinsic(memcpy)
++ #pragma intrinsic(memset)
++
++ #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)
++
++ #if !PX_DOXYGEN
++ namespace physx
++ {
++ #endif
++
++ /*
++ * Implements a memory barrier
++ */
++ PX_FORCE_INLINE void PxMemoryBarrier()
++ {
++ _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 PxHighestSetBitUnsafe(uint64_t v)
++ {
++ unsigned long retval;
++ #ifndef PX_GENERATE_META_DATA
++ _BitScanReverse64(&retval, v);
++ #endif
++ return retval;
++ }
++
++ /*!
++ Returns the index of the highest set bit. Not valid for zero arg.
++ */
++ PX_FORCE_INLINE uint32_t PxHighestSetBitUnsafe(uint32_t v)
++ {
++ unsigned long retval;
++ _BitScanReverse(&retval, v);
++ return retval;
++ }
++
++ /*!
++ Returns the index of the lowest set bit. Undefined for zero arg.
++ */
++ PX_FORCE_INLINE uint32_t PxLowestSetBitUnsafe(uint64_t v)
++ {
++ unsigned long retval;
++ #ifndef PX_GENERATE_META_DATA
++ _BitScanForward64(&retval, v);
++ #endif
++ return retval;
++ }
++
++ /*!
++ Returns the index of the lowest set bit. Undefined for zero arg.
++ */
++ PX_FORCE_INLINE uint32_t PxLowestSetBitUnsafe(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 PxCountLeadingZeros(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 PxPrefetchLine(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 PxPrefetchLine(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 PxPrefetch(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
++ {
++ PxPrefetchLine(cp);
++ cp += 64;
++ } while(--lines);
++ }
++ #else
++ PX_FORCE_INLINE void PxPrefetch(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
++ {
++ PxPrefetchLine(cp);
++ cp += 32;
++ } while(--lines);
++ }
++ #endif
++
++ #if !PX_DOXYGEN
++ } // namespace physx
++ #endif
++
++ #endif
++