mirror of
https://github.com/JayDDee/cpuminer-opt.git
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70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
#if !defined(SIMD_INT_H__)
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#define SIMD_INT_H__ 1
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// Endian byte swap
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#define bswap_64( a ) __builtin_bswap64( a )
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#define bswap_32( a ) __builtin_bswap32( a )
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// Safe division, integer or floating point. For floating point it's as
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// safe as 0. is precisely zero.
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// Returns safe_result if division by zero.
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#define safe_div( dividend, divisor, safe_result ) \
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( (divisor) == 0 ? safe_result : ( (dividend) / (divisor) ) )
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// Aliases with familiar names for built in bit rotate instructions
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#define rol64( a, n ) _lrotl( a, n )
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#define ror64( a, n ) _lrotr( a, n )
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#define rol32( a, n ) _rotl( a, n )
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#define ror32( a, n ) _rotr( a, n )
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#define rol16( a, n ) _rotwl( a, n )
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#define ror16( a, n ) _rotwr( a, n )
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///////////////////////////////////////
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//
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// 128 bit integers
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//
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// 128 bit integers are inneficient and not a shortcut for __m128i.
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// Native type __int128 supported starting with GCC-4.8.
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//
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// __int128 uses two 64 bit GPRs to hold the data. The main benefits are
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// for 128 bit arithmetic. Vectors are preferred when 128 bit arith
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// is not required. int128 also works better with other integer sizes.
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// Vectors benefit from wider registers.
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//
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// For safety use typecasting on all numeric arguments.
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//
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// Use typecasting for conversion to/from 128 bit vector:
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// __m128i v128 = (__m128i)my_int128l
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// __m256i v256 = _mm256_set_m128i( (__m128i)my_int128, (__m128i)my_int128 );
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// my_int128 = (uint128_t)_mm256_extracti128_si256( v256, 1 );
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// obsolete test
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// Compiler check for __int128 support
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// Configure also has a test for int128.
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#if ( __GNUC__ > 4 ) || ( ( __GNUC__ == 4 ) && ( __GNUC_MINOR__ >= 8 ) )
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#define GCC_INT128 1
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#endif
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// obsolte test
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#if !defined(GCC_INT128)
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#warning "__int128 not supported, requires GCC-4.8 or newer."
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#endif
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#if defined(GCC_INT128)
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// Familiar looking type names
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typedef __int128 int128_t;
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typedef unsigned __int128 uint128_t;
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// Extracting the low bits is a trivial cast.
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// These specialized functions are optimized while providing a
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// consistent interface.
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#define u128_hi64( x ) ( (uint64_t)( (uint128_t)(x) >> 64 ) )
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#define u128_lo64( x ) ( (uint64_t)(x) )
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#endif // GCC_INT128
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#endif // SIMD_INT_H__
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