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avx2.cc
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avx2.cc
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/**
* Benchmark for Intel Haswell AVX2 instructions for plain bitwise operations
* on integers.
*
* Compile with
*
* g++ -O3 -march=core-avx-i -mtune=core-avx-i -mavx2 -mno-vzeroupper avx2.cc
*
* Copyright (C) 2014 Alexander Krizhanovsky (ak@natsys-lab.com).
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
* See http://www.gnu.org/licenses/lgpl.html .
*/
#include <sys/time.h>
#include <iostream>
#include <immintrin.h>
volatile unsigned int BIT_PATTERN = 2048;
volatile unsigned int * volatile wc;
static unsigned int __wc[10][16] __attribute__((aligned(64))) = {
{0, 2048, 4096, 48, 5, 11, 8192, 56,
304, 16384, 3, 204, 208, 60, 901, 208},
{0, 304, 2048, 48, 5, 11, 8192, 56,
4096, 16384, 3, 204, 208, 60, 901, 208},
{0, 304, 4096, 48, 5, 2048, 8192, 56,
11, 16384, 3, 204, 208, 60, 901, 208},
{0, 304, 4096, 48, 5, 11, 2048, 56,
1024, 16384, 3, 204, 208, 60, 901, 208},
{0, 304, 4096, 48, 5, 11, 8192, 56,
2048, 16384, 3, 204, 208, 60, 901, 208},
{0, 304, 4096, 48, 5, 11, 8192, 56,
3, 16384, 2048, 204, 208, 60, 901, 208},
{0, 304, 4096, 48, 5, 11, 8192, 56,
60, 16384, 3, 204, 208, 2048, 901, 208},
{0, 304, 4096, 48, 5, 11, 8192, 56,
208, 16384, 3, 204, 208, 60, 901, 2048},
{0, 304, 4096, 48, 2000, 11, 8192, 5,
56, 16384, 3, 204, 2040, 60, 901, 2047},
{2048, 2048, 2048, 2048, 2048, 2048, 2048, 2048,
2048, 2048, 2048, 2048, 2048, 2048, 2048, 2048}
};
inline bool
cycle_lookup_naive(unsigned int bm, volatile unsigned int *w)
{
for (int i = 0; i < 16; ++i)
if (bm & w[i])
return true;
return false;
}
inline bool
cycle_lookup(unsigned int bm, volatile unsigned int *w)
{
unsigned long *_w = (unsigned long *)w;
unsigned long _bm = ((unsigned long)bm << 32) | bm;
for (int i = 0; i < 8; ++i)
if (_bm & _w[i])
return true;
return false;
}
inline bool
cycle_lookup_opt(unsigned int bm, volatile unsigned int *w)
{
unsigned long r = 0;
unsigned long *_w = (unsigned long *)w;
unsigned long _bm = ((unsigned long)bm << 32) | bm;
for (int i = 0; i < 8; ++i)
r |= _w[i];
return r & _bm;
}
inline bool
avx2_lookup(unsigned int bm, volatile unsigned int *w)
{
#define OR8(a) (a[0] | a[1] | a[2] | a[3] | a[4] | a[5] | a[6] | a[7])
union {
__m128i _128[2];
int _32[8];
} mr;
__m256i m = _mm256_set_epi32(bm, bm, bm, bm, bm, bm, bm, bm);
__m256i v0 = _mm256_set_epi32(w[0], w[1], w[2], w[3],
w[4], w[5], w[6], w[7]);
__m256i v1 = _mm256_set_epi32(w[8], w[9], w[10], w[11],
w[12], w[13], w[14], w[15]);
__m256i a0 = _mm256_and_si256(v0, m);
__m256i a1 = _mm256_and_si256(v1, m);
__m256i o = _mm256_or_si256(a0, a1);
mr._128[0] = _mm256_extracti128_si256(o, 0);
mr._128[1] = _mm256_extracti128_si256(o, 1);
return !!OR8(mr._32);
#undef OR8
}
inline bool
avx2_lookup_opt1(unsigned int bm, volatile unsigned int *w)
{
union {
__m128i _128;
long _64[2];
} mr;
__m128i m = _mm_set1_epi32(bm);
__m256i v0 = _mm256_set_epi64x(*(long *)w, *(long *)(w + 2),
*(long *)(w + 4), *(long *)(w + 6));
__m256i v1 = _mm256_set_epi64x(*(long *)(w + 8), *(long *)(w + 10),
*(long *)(w + 12), *(long *)(w + 14));
__m256i o0 = _mm256_or_si256(v0, v1);
__m128i h0 = _mm256_extracti128_si256(o0, 0);
__m128i h1 = _mm256_extracti128_si256(o0, 1);
__m128i o1 = _mm_or_si128(h0, h1);
mr._128 = _mm_and_si128(o1, m);
return mr._64[0] || mr._64[1];
}
inline bool
avx2_lookup_opt2(unsigned int bm, volatile unsigned int *w)
{
__m256i m = _mm256_set1_epi32(bm);
__m256i v0 = _mm256_set_epi64x(*(long *)w, *(long *)(w + 2),
*(long *)(w + 4), *(long *)(w + 6));
__m256i v1 = _mm256_set_epi64x(*(long *)(w + 8), *(long *)(w + 10),
*(long *)(w + 12), *(long *)(w + 14));
__m256i o = _mm256_or_si256(v0, v1);
return !_mm256_testz_si256(o, m);
}
inline bool
avx2_lookup_opt3(unsigned int bm, volatile unsigned int *w)
{
__m256i m = _mm256_set1_epi32(bm);
__m256i o = _mm256_or_si256(*(__m256i *)w, *(__m256i *)(w + 8));
return !_mm256_testz_si256(o, m);
}
static inline unsigned long
tv_to_ms(const struct timeval &tv)
{
return ((unsigned long)tv.tv_sec * 1000000 + tv.tv_usec) / 1000;
}
#define test(lookup, t) \
do { \
bool r = false; \
struct timeval tv0, tv1; \
\
gettimeofday(&tv0, NULL); \
\
for (int i = 0; i < 10000000; ++i) \
r |= lookup(BIT_PATTERN, wc + t * 16); \
\
gettimeofday(&tv1, NULL); \
\
std::cout << (r ? "found, " : "not found, ") \
<< (tv_to_ms(tv1) - tv_to_ms(tv0)) << "ms" << std::endl; \
} while (0)
void
test_case(int t)
{
std::cout << "---- test case " << t << " ----"<< std::endl;
test(cycle_lookup_naive, t);
test(cycle_lookup, t);
test(cycle_lookup_opt, t);
test(avx2_lookup, t);
test(avx2_lookup_opt1, t);
test(avx2_lookup_opt2, t);
test(avx2_lookup_opt3, t);
}
#define do_test_all(lookup) \
do { \
bool r = false; \
struct timeval tv0, tv1; \
\
gettimeofday(&tv0, NULL); \
\
for (int i = 0; i < 10000000; ++i) \
for (int j = 0; j < 10; ++j) \
r |= lookup(BIT_PATTERN, wc + j * 16); \
\
gettimeofday(&tv1, NULL); \
\
if (!r) \
abort(); \
std::cout << (tv_to_ms(tv1) - tv_to_ms(tv0)) << "ms" << std::endl; \
} while (0)
void
test_all()
{
std::cout << "---- test all ----"<< std::endl;
do_test_all(cycle_lookup_naive);
do_test_all(cycle_lookup);
do_test_all(cycle_lookup_opt);
do_test_all(avx2_lookup);
do_test_all(avx2_lookup_opt1);
do_test_all(avx2_lookup_opt2);
do_test_all(avx2_lookup_opt3);
}
int
main()
{
// Prohibit compiler optimizations for staticness and constantness
// of the arrays.
wc = (volatile unsigned int * volatile)__wc;
for (int i = 0; i < 10; ++i)
test_case(i);
test_all();
return 0;
}