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 PSFOUNDATION_PSUNIXINTRINSICS_H
++ #define PSFOUNDATION_PSUNIXINTRINSICS_H
++
++ #include "foundation/PxAssert.h"
++ #include <math.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_LINUX || PX_APPLE_FAMILY)
++ #error "This file should only be included by unix builds!!"
++ #endif
++
++ #if !PX_DOXYGEN
++ namespace physx
++ {
++ #endif
++
++ PX_FORCE_INLINE void PxMemoryBarrier()
++ {
++ __sync_synchronize();
++ }
++
++ /*!
++ Return the index of the highest set bit. Undefined for zero arg.
++ */
++ PX_INLINE uint32_t PxHighestSetBitUnsafe(uint64_t v)
++ {
++ return uint32_t(63 - __builtin_clzl(v));
++ }
++
++ /*!
++ Return the index of the highest set bit. Undefined for zero arg.
++ */
++ PX_INLINE uint32_t PxHighestSetBitUnsafe(uint32_t v)
++ {
++ return uint32_t(31 - __builtin_clz(v));
++ }
++
++ /*!
++ Return the index of the lowest set bit. Undefined for zero arg.
++ */
++ PX_INLINE uint32_t PxLowestSetBitUnsafe(uint64_t v)
++ {
++ return uint32_t(__builtin_ctzl(v));
++ }
++
++ /*!
++ Return the index of the lowest set bit. Undefined for zero arg.
++ */
++ PX_INLINE uint32_t PxLowestSetBitUnsafe(uint32_t v)
++ {
++ return uint32_t(__builtin_ctz(v));
++ }
++
++ /*!
++ Returns the index of the highest set bit. Returns 32 for v=0.
++ */
++ PX_INLINE uint32_t PxCountLeadingZeros(uint32_t v)
++ {
++ if(v)
++ return uint32_t(__builtin_clz(v));
++ else
++ return 32u;
++ }
++
++ /*!
++ Prefetch aligned 64B x86, 32b ARM around \c ptr+offset.
++ */
++ PX_FORCE_INLINE void PxPrefetchLine(const void* ptr, uint32_t offset = 0)
++ {
++ #if PX_CUDA_COMPILER
++ __builtin_prefetch(reinterpret_cast<const char*>(ptr) + offset, 0, 3);
++ #else
++ __builtin_prefetch(reinterpret_cast<const char* PX_RESTRICT>(ptr) + offset, 0, 3);
++ #endif
++ }
++
++ /*!
++ Prefetch \c count bytes starting at \c ptr.
++ */
++ PX_FORCE_INLINE void PxPrefetch(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
++ {
++ PxPrefetchLine(cp);
++ cp += 64;
++ } while(--lines);
++ }
++
++ #if !PX_DOXYGEN
++ } // namespace physx
++ #endif
++
++ #endif