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physx/source/foundation/include/unix/PsUnixIntrinsics.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_PSUNIXINTRINSICS_H
+#define PSFOUNDATION_PSUNIXINTRINSICS_H
+
+#include "Ps.h"
+#include "foundation/PxAssert.h"
+#include <math.h>
+
+#if PX_ANDROID
+#include <signal.h> // for Ns::debugBreak() { raise(SIGTRAP); }
+#endif
+
+#if 0
+#include <libkern/OSAtomic.h>
+#endif
+
+// 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_ANDROID || PX_PS4 || PX_APPLE_FAMILY)
+#error "This file should only be included by unix builds!!"
+#endif
+
+namespace physx
+{
+namespace shdfnd
+{
+
+PX_FORCE_INLINE void memoryBarrier()
+{
+	__sync_synchronize();
+}
+
+/*!
+Return the index of the highest set bit. Undefined for zero arg.
+*/
+PX_INLINE uint32_t highestSetBitUnsafe(uint32_t v)
+{
+
+	return 31 - __builtin_clz(v);
+}
+
+/*!
+Return the index of the highest set bit. Undefined for zero arg.
+*/
+PX_INLINE int32_t lowestSetBitUnsafe(uint32_t v)
+{
+	return __builtin_ctz(v);
+}
+
+/*!
+Returns the index of the highest set bit. Returns 32 for v=0.
+*/
+PX_INLINE uint32_t countLeadingZeros(uint32_t v)
+{
+	if(v)
+		return __builtin_clz(v);
+	else
+		return 32;
+}
+
+/*!
+Prefetch aligned 64B x86, 32b ARM around \c ptr+offset.
+*/
+PX_FORCE_INLINE void prefetchLine(const void* ptr, uint32_t offset = 0)
+{
+	__builtin_prefetch(reinterpret_cast<const char* PX_RESTRICT>(ptr) + offset, 0, 3);
+}
+
+/*!
+Prefetch \c count bytes starting at \c ptr.
+*/
+#if PX_ANDROID || PX_IOS
+PX_FORCE_INLINE void prefetch(const void* ptr, uint32_t count = 1)
+{
+	const char* cp = static_cast<const char*>(ptr);
+	size_t p = reinterpret_cast<size_t>(ptr);
+	uint32_t startLine = uint32_t(p >> 5), endLine = uint32_t((p + count - 1) >> 5);
+	uint32_t lines = endLine - startLine + 1;
+	do
+	{
+		prefetchLine(cp);
+		cp += 32;
+	} while(--lines);
+}
+#else
+PX_FORCE_INLINE void prefetch(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
+	{
+		prefetchLine(cp);
+		cp += 64;
+	} 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_PSUNIXINTRINSICS_H