109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2023 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#ifndef PSFOUNDATION_PSUNIXINTRINSICS_H
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#define PSFOUNDATION_PSUNIXINTRINSICS_H
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#include "foundation/PxAssert.h"
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#include <math.h>
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// this file is for internal intrinsics - that is, intrinsics that are used in
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// cross platform code but do not appear in the API
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#if !(PX_LINUX || PX_APPLE_FAMILY)
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#error "This file should only be included by unix builds!!"
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#endif
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#if !PX_DOXYGEN
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namespace physx
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{
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#endif
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PX_FORCE_INLINE void PxMemoryBarrier()
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{
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__sync_synchronize();
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}
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/*!
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Return the index of the highest set bit. Undefined for zero arg.
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*/
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PX_INLINE uint32_t PxHighestSetBitUnsafe(uint32_t v)
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{
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return uint32_t(31 - __builtin_clz(v));
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}
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/*!
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Return the index of the highest set bit. Undefined for zero arg.
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*/
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PX_INLINE uint32_t PxLowestSetBitUnsafe(uint32_t v)
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{
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return uint32_t(__builtin_ctz(v));
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}
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/*!
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Returns the index of the highest set bit. Returns 32 for v=0.
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*/
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PX_INLINE uint32_t PxCountLeadingZeros(uint32_t v)
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{
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if(v)
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return uint32_t(__builtin_clz(v));
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else
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return 32u;
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}
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/*!
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Prefetch aligned 64B x86, 32b ARM around \c ptr+offset.
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*/
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PX_FORCE_INLINE void PxPrefetchLine(const void* ptr, uint32_t offset = 0)
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{
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__builtin_prefetch(reinterpret_cast<const char* PX_RESTRICT>(ptr) + offset, 0, 3);
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}
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/*!
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Prefetch \c count bytes starting at \c ptr.
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*/
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PX_FORCE_INLINE void PxPrefetch(const void* ptr, uint32_t count = 1)
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{
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const char* cp = reinterpret_cast<const char*>(ptr);
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uint64_t p = size_t(ptr);
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uint64_t startLine = p >> 6, endLine = (p + count - 1) >> 6;
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uint64_t lines = endLine - startLine + 1;
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do
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{
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PxPrefetchLine(cp);
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cp += 64;
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} while(--lines);
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}
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#if !PX_DOXYGEN
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} // namespace physx
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#endif
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#endif // #ifndef PSFOUNDATION_PSUNIXINTRINSICS_H
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