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/*
* Prefetching Operations
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_PREFETCH_H__
#define BOTAN_PREFETCH_H__
#include <botan/cpuid.h>
namespace Botan {
namespace PREFETCH {
template<typename T>
inline void readonly(const T* addr, u32bit length)
{
#if defined(__GNUG__)
const u32bit Ts_per_cache_line = CPUID::cache_line_size() / sizeof(T);
for(u32bit i = 0; i <= length; i += Ts_per_cache_line)
__builtin_prefetch(addr + i, 0);
#endif
}
template<typename T>
inline void readwrite(const T* addr, u32bit length)
{
#if defined(__GNUG__)
const u32bit Ts_per_cache_line = CPUID::cache_line_size() / sizeof(T);
for(u32bit i = 0; i <= length; i += Ts_per_cache_line)
__builtin_prefetch(addr + i, 0);
#endif
}
inline void cipher_fetch(const byte* in_block,
const byte* out_block,
u32bit blocks,
u32bit block_size)
{
// Only prefetch input specifically if in != out
if(in_block != out_block)
readonly(in_block, blocks * block_size);
readwrite(out_block, blocks * block_size);
}
}
}
#endif
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