PxUnixIntrinsics.h

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// 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 "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();
}
 
PX_INLINE uint32_t PxHighestSetBitUnsafe(uint32_t v)
{
 
    return uint32_t(31 - __builtin_clz(v));
}
 
PX_INLINE uint32_t PxLowestSetBitUnsafe(uint32_t v)
{
    return uint32_t(__builtin_ctz(v));
}
 
PX_INLINE uint32_t PxCountLeadingZeros(uint32_t v)
{
    if(v)
        return uint32_t(__builtin_clz(v));
    else
        return 32u;
}
 
PX_FORCE_INLINE void PxPrefetchLine(const void* ptr, uint32_t offset = 0)
{
    __builtin_prefetch(reinterpret_cast<const char* PX_RESTRICT>(ptr) + offset, 0, 3);
}
 
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 // #ifndef PSFOUNDATION_PSUNIXINTRINSICS_H