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physx/source/foundation/include/windows/PsWindowsIntrinsics.h

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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