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// Based on rand_sse at http://software.intel.com/en-us/articles/fast-random-number-generator-on-the-intel-pentiumr-4-processor/
#include <emmintrin.h>
__declspec( align(16) ) static __m128i cur_seed;
void srand_sse( unsigned int seed )
{
cur_seed = _mm_set_epi32( seed, seed+1, seed, seed+1 );
}
inline void rand_sse( int *result )
{
__declspec( align(16) ) __m128i cur_seed_split;
__declspec( align(16) ) __m128i multiplier;
__declspec( align(16) ) __m128i adder;
__declspec( align(16) ) __m128i mod_mask;
__declspec( align(16) ) __m128i sra_mask;
__declspec( align(16) ) __m128i sseresult;
__declspec( align(16) ) static const unsigned int mult[4] = { 214013, 17405, 214013, 69069 };
__declspec( align(16) ) static const unsigned int gadd[4] = { 2531011, 10395331, 13737667, 1 };
__declspec( align(16) ) static const unsigned int mask[4] = { 0xFFFFFFFF, 0, 0xFFFFFFFF, 0 };
__declspec( align(16) ) static const unsigned int masklo[4] = { 0x00007FFF, 0x00007FFF, 0x00007FFF, 0x00007FFF };
adder = _mm_load_si128( (__m128i*) gadd);
multiplier = _mm_load_si128( (__m128i*) mult);
mod_mask = _mm_load_si128( (__m128i*) mask);
sra_mask = _mm_load_si128( (__m128i*) masklo);
cur_seed_split = _mm_shuffle_epi32( cur_seed, _MM_SHUFFLE( 2, 3, 0, 1 ) );
cur_seed = _mm_mul_epu32( cur_seed, multiplier );
multiplier = _mm_shuffle_epi32( multiplier, _MM_SHUFFLE( 2, 3, 0, 1 ) );
cur_seed_split = _mm_mul_epu32( cur_seed_split, multiplier );
cur_seed = _mm_and_si128( cur_seed, mod_mask);
cur_seed_split = _mm_and_si128( cur_seed_split, mod_mask );
cur_seed_split = _mm_shuffle_epi32( cur_seed_split, _MM_SHUFFLE( 2, 3, 0, 1 ) );
cur_seed = _mm_or_si128( cur_seed, cur_seed_split );
cur_seed = _mm_add_epi32( cur_seed, adder);
sseresult = _mm_srai_epi32( cur_seed, 16);
sseresult = _mm_and_si128( sseresult, sra_mask );
_mm_storeu_si128( (__m128i*) result, sseresult );
return;
}
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