prefetch.h File Reference

Memory prefetch. More...

Include dependency graph for prefetch.h:

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Enumerations
enum class	ArchPrefetchAccess { Read = 0 , Write = 1 }
	The kind of access a prefetch is preparing for. More...
enum class	ArchPrefetchLocality { None = 0 , L3 = 1 , L2 = 2 , L1 = 3 }
	How much temporal locality you expect on the address after the fetch. More...

Functions
template<size_t Size = 1, size_t Align = 1, ArchPrefetchAccess Access = ArchPrefetchAccess::Read, ArchPrefetchLocality Locality = ArchPrefetchLocality::L2>
void	ArchPrefetch (void const *addr) noexcept
	Prefetch the cache lines that [addr, addr+Size) occupy.
template<ArchPrefetchAccess Access = ArchPrefetchAccess::Read, ArchPrefetchLocality Locality = ArchPrefetchLocality::L2>
void	ArchPrefetchRange (void const *addr, size_t numBytes) noexcept
	Prefetch the cache lines that [addr, addr+numBytes) occupy, where numBytes is a runtime value.
template<ArchPrefetchAccess Access = ArchPrefetchAccess::Read, ArchPrefetchLocality Locality = ArchPrefetchLocality::L2, class T >
void	ArchPrefetchRange (T const *addr, size_t count) noexcept
	Prefetch the cache lines that the count objects of type T starting at addr occupy, as in ArchPrefetchRange(vec.data(), vec.size()).
template<ArchPrefetchLocality Locality = ArchPrefetchLocality::L2, class T >
void	ArchPrefetchRead (T const *addr) noexcept
	Prefetch for reading the object at addr with given locality.
template<ArchPrefetchLocality Locality = ArchPrefetchLocality::L2, class T >
void	ArchPrefetchWrite (T const *addr) noexcept
	Prefetch for writing the object at addr with given locality.

Detailed Description

Memory prefetch.

Use these to hide latency when you know you're likely going to read/write an address soon but have the ability to spend the latency cycles doing independent work.

Definition in file prefetch.h.