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libsais16x64.c
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/*--
This file is a part of libsais, a library for linear time suffix array,
longest common prefix array and burrows wheeler transform construction.
Copyright (c) 2021-2025 Ilya Grebnov <ilya.grebnov@gmail.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Please see the file LICENSE for full copyright information.
--*/
#include "libsais16.h"
#include "libsais16x64.h"
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#if defined(LIBSAIS_OPENMP)
#include <omp.h>
#else
#define UNUSED(_x) (void)(_x)
#endif
typedef int64_t sa_sint_t;
typedef uint64_t sa_uint_t;
typedef int64_t fast_sint_t;
typedef uint64_t fast_uint_t;
#define SAINT_BIT (64)
#define SAINT_MAX INT64_MAX
#define SAINT_MIN INT64_MIN
#define ALPHABET_SIZE (1 << CHAR_BIT << CHAR_BIT)
#define UNBWT_FASTBITS (17)
#define SUFFIX_GROUP_BIT (SAINT_BIT - 1)
#define SUFFIX_GROUP_MARKER (((sa_sint_t)1) << (SUFFIX_GROUP_BIT - 1))
#define BUCKETS_INDEX2(_c, _s) ((((fast_sint_t)_c) << 1) + (fast_sint_t)(_s))
#define BUCKETS_INDEX4(_c, _s) ((((fast_sint_t)_c) << 2) + (fast_sint_t)(_s))
#define LIBSAIS_LOCAL_BUFFER_SIZE (1024)
#define LIBSAIS_PER_THREAD_CACHE_SIZE (2097184)
typedef struct LIBSAIS_THREAD_CACHE
{
sa_sint_t symbol;
sa_sint_t index;
} LIBSAIS_THREAD_CACHE;
typedef union LIBSAIS_THREAD_STATE
{
struct
{
fast_sint_t position;
fast_sint_t count;
fast_sint_t m;
fast_sint_t last_lms_suffix;
sa_sint_t * buckets;
LIBSAIS_THREAD_CACHE * cache;
} state;
uint8_t padding[64];
} LIBSAIS_THREAD_STATE;
typedef struct LIBSAIS_CONTEXT
{
sa_sint_t * buckets;
LIBSAIS_THREAD_STATE * thread_state;
fast_sint_t threads;
} LIBSAIS_CONTEXT;
typedef struct LIBSAIS_UNBWT_CONTEXT
{
sa_uint_t * bucket2;
uint16_t * fastbits;
sa_uint_t * buckets;
fast_sint_t threads;
} LIBSAIS_UNBWT_CONTEXT;
#if defined(__GNUC__) || defined(__clang__)
#define RESTRICT __restrict__
#elif defined(_MSC_VER) || defined(__INTEL_COMPILER)
#define RESTRICT __restrict
#else
#error Your compiler, configuration or platform is not supported.
#endif
#if defined(__has_builtin)
#if __has_builtin(__builtin_prefetch)
#define HAS_BUILTIN_PREFETCH
#endif
#elif defined(__GNUC__) && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 2)) || (__GNUC__ >= 4))
#define HAS_BUILTIN_PREFETCH
#endif
#if defined(HAS_BUILTIN_PREFETCH)
#define libsais16x64_prefetchr(address) __builtin_prefetch((const void *)(address), 0, 3)
#define libsais16x64_prefetchw(address) __builtin_prefetch((const void *)(address), 1, 3)
#elif defined (_M_IX86) || defined (_M_AMD64)
#include <intrin.h>
#define libsais16x64_prefetchr(address) _mm_prefetch((const void *)(address), _MM_HINT_T0)
#define libsais16x64_prefetchw(address) _m_prefetchw((const void *)(address))
#elif defined (_M_ARM)
#include <intrin.h>
#define libsais16x64_prefetchr(address) __prefetch((const void *)(address))
#define libsais16x64_prefetchw(address) __prefetchw((const void *)(address))
#elif defined (_M_ARM64)
#include <intrin.h>
#define libsais16x64_prefetchr(address) __prefetch2((const void *)(address), 0)
#define libsais16x64_prefetchw(address) __prefetch2((const void *)(address), 16)
#else
#error Your compiler, configuration or platform is not supported.
#endif
#if !defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
#if defined(_LITTLE_ENDIAN) \
|| (defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && BYTE_ORDER == LITTLE_ENDIAN) \
|| (defined(_BYTE_ORDER) && defined(_LITTLE_ENDIAN) && _BYTE_ORDER == _LITTLE_ENDIAN) \
|| (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN) \
|| (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#define __LITTLE_ENDIAN__
#elif defined(_BIG_ENDIAN) \
|| (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN) \
|| (defined(_BYTE_ORDER) && defined(_BIG_ENDIAN) && _BYTE_ORDER == _BIG_ENDIAN) \
|| (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN) \
|| (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define __BIG_ENDIAN__
#elif defined(_WIN32)
#define __LITTLE_ENDIAN__
#endif
#endif
static void * libsais16x64_align_up(const void * address, size_t alignment)
{
return (void *)((((ptrdiff_t)address) + ((ptrdiff_t)alignment) - 1) & (-((ptrdiff_t)alignment)));
}
static void * libsais16x64_alloc_aligned(size_t size, size_t alignment)
{
void * address = malloc(size + sizeof(short) + alignment - 1);
if (address != NULL)
{
void * aligned_address = libsais16x64_align_up((void *)((ptrdiff_t)address + (ptrdiff_t)(sizeof(short))), alignment);
((short *)aligned_address)[-1] = (short)((ptrdiff_t)aligned_address - (ptrdiff_t)address);
return aligned_address;
}
return NULL;
}
static void libsais16x64_free_aligned(void * aligned_address)
{
if (aligned_address != NULL)
{
free((void *)((ptrdiff_t)aligned_address - ((short *)aligned_address)[-1]));
}
}
static LIBSAIS_THREAD_STATE * libsais16x64_alloc_thread_state(sa_sint_t threads)
{
LIBSAIS_THREAD_STATE * RESTRICT thread_state = (LIBSAIS_THREAD_STATE *)libsais16x64_alloc_aligned((size_t)threads * sizeof(LIBSAIS_THREAD_STATE), 4096);
sa_sint_t * RESTRICT thread_buckets = (sa_sint_t *)libsais16x64_alloc_aligned((size_t)threads * 4 * ALPHABET_SIZE * sizeof(sa_sint_t), 4096);
LIBSAIS_THREAD_CACHE * RESTRICT thread_cache = (LIBSAIS_THREAD_CACHE *)libsais16x64_alloc_aligned((size_t)threads * LIBSAIS_PER_THREAD_CACHE_SIZE * sizeof(LIBSAIS_THREAD_CACHE), 4096);
if (thread_state != NULL && thread_buckets != NULL && thread_cache != NULL)
{
fast_sint_t t;
for (t = 0; t < threads; ++t)
{
thread_state[t].state.buckets = thread_buckets; thread_buckets += 4 * ALPHABET_SIZE;
thread_state[t].state.cache = thread_cache; thread_cache += LIBSAIS_PER_THREAD_CACHE_SIZE;
}
return thread_state;
}
libsais16x64_free_aligned(thread_cache);
libsais16x64_free_aligned(thread_buckets);
libsais16x64_free_aligned(thread_state);
return NULL;
}
static void libsais16x64_free_thread_state(LIBSAIS_THREAD_STATE * thread_state)
{
if (thread_state != NULL)
{
libsais16x64_free_aligned(thread_state[0].state.cache);
libsais16x64_free_aligned(thread_state[0].state.buckets);
libsais16x64_free_aligned(thread_state);
}
}
#if defined(LIBSAIS_OPENMP)
static sa_sint_t libsais16x64_count_negative_marked_suffixes(sa_sint_t * RESTRICT SA, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
sa_sint_t count = 0;
fast_sint_t i; for (i = omp_block_start; i < omp_block_start + omp_block_size; ++i) { count += (SA[i] < 0); }
return count;
}
static sa_sint_t libsais16x64_count_zero_marked_suffixes(sa_sint_t * RESTRICT SA, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
sa_sint_t count = 0;
fast_sint_t i; for (i = omp_block_start; i < omp_block_start + omp_block_size; ++i) { count += (SA[i] == 0); }
return count;
}
static void libsais16x64_place_cached_suffixes(sa_sint_t * RESTRICT SA, LIBSAIS_THREAD_CACHE * RESTRICT cache, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
const fast_sint_t prefetch_distance = 32;
fast_sint_t i, j;
for (i = omp_block_start, j = omp_block_start + omp_block_size - prefetch_distance - 3; i < j; i += 4)
{
libsais16x64_prefetchr(&cache[i + 2 * prefetch_distance]);
libsais16x64_prefetchw(&SA[cache[i + prefetch_distance + 0].symbol]);
libsais16x64_prefetchw(&SA[cache[i + prefetch_distance + 1].symbol]);
libsais16x64_prefetchw(&SA[cache[i + prefetch_distance + 2].symbol]);
libsais16x64_prefetchw(&SA[cache[i + prefetch_distance + 3].symbol]);
SA[cache[i + 0].symbol] = cache[i + 0].index;
SA[cache[i + 1].symbol] = cache[i + 1].index;
SA[cache[i + 2].symbol] = cache[i + 2].index;
SA[cache[i + 3].symbol] = cache[i + 3].index;
}
for (j += prefetch_distance + 3; i < j; i += 1)
{
SA[cache[i].symbol] = cache[i].index;
}
}
static void libsais16x64_compact_and_place_cached_suffixes(sa_sint_t * RESTRICT SA, LIBSAIS_THREAD_CACHE * RESTRICT cache, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
const fast_sint_t prefetch_distance = 32;
fast_sint_t i, j, l;
for (i = omp_block_start, j = omp_block_start + omp_block_size - 3, l = omp_block_start; i < j; i += 4)
{
libsais16x64_prefetchw(&cache[i + prefetch_distance]);
cache[l] = cache[i + 0]; l += cache[l].symbol >= 0;
cache[l] = cache[i + 1]; l += cache[l].symbol >= 0;
cache[l] = cache[i + 2]; l += cache[l].symbol >= 0;
cache[l] = cache[i + 3]; l += cache[l].symbol >= 0;
}
for (j += 3; i < j; i += 1)
{
cache[l] = cache[i]; l += cache[l].symbol >= 0;
}
libsais16x64_place_cached_suffixes(SA, cache, omp_block_start, l - omp_block_start);
}
static void libsais16x64_accumulate_counts_s32_2(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s]; }
}
static void libsais16x64_accumulate_counts_s32_3(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s]; }
}
static void libsais16x64_accumulate_counts_s32_4(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
sa_sint_t * RESTRICT bucket03 = bucket02 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s] + bucket03[s]; }
}
static void libsais16x64_accumulate_counts_s32_5(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
sa_sint_t * RESTRICT bucket03 = bucket02 - bucket_stride;
sa_sint_t * RESTRICT bucket04 = bucket03 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s] + bucket03[s] + bucket04[s]; }
}
static void libsais16x64_accumulate_counts_s32_6(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
sa_sint_t * RESTRICT bucket03 = bucket02 - bucket_stride;
sa_sint_t * RESTRICT bucket04 = bucket03 - bucket_stride;
sa_sint_t * RESTRICT bucket05 = bucket04 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s] + bucket03[s] + bucket04[s] + bucket05[s]; }
}
static void libsais16x64_accumulate_counts_s32_7(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
sa_sint_t * RESTRICT bucket03 = bucket02 - bucket_stride;
sa_sint_t * RESTRICT bucket04 = bucket03 - bucket_stride;
sa_sint_t * RESTRICT bucket05 = bucket04 - bucket_stride;
sa_sint_t * RESTRICT bucket06 = bucket05 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s] + bucket03[s] + bucket04[s] + bucket05[s] + bucket06[s]; }
}
static void libsais16x64_accumulate_counts_s32_8(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
sa_sint_t * RESTRICT bucket03 = bucket02 - bucket_stride;
sa_sint_t * RESTRICT bucket04 = bucket03 - bucket_stride;
sa_sint_t * RESTRICT bucket05 = bucket04 - bucket_stride;
sa_sint_t * RESTRICT bucket06 = bucket05 - bucket_stride;
sa_sint_t * RESTRICT bucket07 = bucket06 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s] + bucket03[s] + bucket04[s] + bucket05[s] + bucket06[s] + bucket07[s]; }
}
static void libsais16x64_accumulate_counts_s32_9(sa_sint_t * RESTRICT bucket00, fast_sint_t bucket_size, fast_sint_t bucket_stride)
{
sa_sint_t * RESTRICT bucket01 = bucket00 - bucket_stride;
sa_sint_t * RESTRICT bucket02 = bucket01 - bucket_stride;
sa_sint_t * RESTRICT bucket03 = bucket02 - bucket_stride;
sa_sint_t * RESTRICT bucket04 = bucket03 - bucket_stride;
sa_sint_t * RESTRICT bucket05 = bucket04 - bucket_stride;
sa_sint_t * RESTRICT bucket06 = bucket05 - bucket_stride;
sa_sint_t * RESTRICT bucket07 = bucket06 - bucket_stride;
sa_sint_t * RESTRICT bucket08 = bucket07 - bucket_stride;
fast_sint_t s; for (s = 0; s < bucket_size; s += 1) { bucket00[s] = bucket00[s] + bucket01[s] + bucket02[s] + bucket03[s] + bucket04[s] + bucket05[s] + bucket06[s] + bucket07[s] + bucket08[s]; }
}
static void libsais16x64_accumulate_counts_s32(sa_sint_t * RESTRICT buckets, fast_sint_t bucket_size, fast_sint_t bucket_stride, fast_sint_t num_buckets)
{
while (num_buckets >= 9)
{
libsais16x64_accumulate_counts_s32_9(buckets - (num_buckets - 9) * bucket_stride, bucket_size, bucket_stride); num_buckets -= 8;
}
switch (num_buckets)
{
case 1: break;
case 2: libsais16x64_accumulate_counts_s32_2(buckets, bucket_size, bucket_stride); break;
case 3: libsais16x64_accumulate_counts_s32_3(buckets, bucket_size, bucket_stride); break;
case 4: libsais16x64_accumulate_counts_s32_4(buckets, bucket_size, bucket_stride); break;
case 5: libsais16x64_accumulate_counts_s32_5(buckets, bucket_size, bucket_stride); break;
case 6: libsais16x64_accumulate_counts_s32_6(buckets, bucket_size, bucket_stride); break;
case 7: libsais16x64_accumulate_counts_s32_7(buckets, bucket_size, bucket_stride); break;
case 8: libsais16x64_accumulate_counts_s32_8(buckets, bucket_size, bucket_stride); break;
}
}
#endif
static void libsais16x64_gather_lms_suffixes_16u(const uint16_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, fast_sint_t m, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
if (omp_block_size > 0)
{
const fast_sint_t prefetch_distance = 128;
fast_sint_t i, j = omp_block_start + omp_block_size, c0 = T[omp_block_start + omp_block_size - 1], c1 = -1;
while (j < n && (c1 = T[j]) == c0) { ++j; }
fast_uint_t s = c0 >= c1;
for (i = omp_block_start + omp_block_size - 2, j = omp_block_start + 3; i >= j; i -= 4)
{
libsais16x64_prefetchr(&T[i - prefetch_distance]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 0); m -= ((s & 3) == 1);
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 1); m -= ((s & 3) == 1);
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 2); m -= ((s & 3) == 1);
}
for (j -= 3; i >= j; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
}
SA[m] = (sa_sint_t)(i + 1);
}
}
static void libsais16x64_gather_lms_suffixes_16u_omp(const uint16_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t threads, LIBSAIS_THREAD_STATE * RESTRICT thread_state)
{
#if defined(LIBSAIS_OPENMP)
#pragma omp parallel num_threads(threads) if(threads > 1 && n >= 65536 && omp_get_dynamic() == 0)
#endif
{
#if defined(LIBSAIS_OPENMP)
fast_sint_t omp_thread_num = omp_get_thread_num();
fast_sint_t omp_num_threads = omp_get_num_threads();
#else
UNUSED(threads); UNUSED(thread_state);
fast_sint_t omp_thread_num = 0;
fast_sint_t omp_num_threads = 1;
#endif
fast_sint_t omp_block_stride = (n / omp_num_threads) & (-16);
fast_sint_t omp_block_start = omp_thread_num * omp_block_stride;
fast_sint_t omp_block_size = omp_thread_num < omp_num_threads - 1 ? omp_block_stride : n - omp_block_start;
if (omp_num_threads == 1)
{
libsais16x64_gather_lms_suffixes_16u(T, SA, n, (fast_sint_t)n - 1, omp_block_start, omp_block_size);
}
#if defined(LIBSAIS_OPENMP)
else
{
fast_sint_t t, m = 0; for (t = omp_num_threads - 1; t > omp_thread_num; --t) { m += thread_state[t].state.m; }
libsais16x64_gather_lms_suffixes_16u(T, SA, n, (fast_sint_t)n - 1 - m, omp_block_start, omp_block_size);
#pragma omp barrier
if (thread_state[omp_thread_num].state.m > 0)
{
SA[(fast_sint_t)n - 1 - m] = (sa_sint_t)thread_state[omp_thread_num].state.last_lms_suffix;
}
}
#endif
}
}
static sa_sint_t libsais16x64_gather_lms_suffixes_32s(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n)
{
const fast_sint_t prefetch_distance = 32;
sa_sint_t i = n - 2;
sa_sint_t m = n - 1;
fast_uint_t s = 1;
fast_sint_t c0 = T[n - 1];
fast_sint_t c1 = 0;
for (; i >= 3; i -= 4)
{
libsais16x64_prefetchr(&T[i - prefetch_distance]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = i + 1; m -= ((s & 3) == 1);
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = i - 0; m -= ((s & 3) == 1);
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = i - 1; m -= ((s & 3) == 1);
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = i - 2; m -= ((s & 3) == 1);
}
for (; i >= 0; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = i + 1; m -= ((s & 3) == 1);
}
return n - 1 - m;
}
static sa_sint_t libsais16x64_gather_compacted_lms_suffixes_32s(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n)
{
const fast_sint_t prefetch_distance = 32;
sa_sint_t i = n - 2;
sa_sint_t m = n - 1;
fast_uint_t s = 1;
fast_sint_t c0 = T[n - 1];
fast_sint_t c1 = 0;
for (; i >= 3; i -= 4)
{
libsais16x64_prefetchr(&T[i - prefetch_distance]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = i + 1; m -= ((fast_sint_t)(s & 3) == (c0 >= 0));
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = i - 0; m -= ((fast_sint_t)(s & 3) == (c1 >= 0));
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = i - 1; m -= ((fast_sint_t)(s & 3) == (c0 >= 0));
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = i - 2; m -= ((fast_sint_t)(s & 3) == (c1 >= 0));
}
for (; i >= 0; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = i + 1; m -= ((fast_sint_t)(s & 3) == (c1 >= 0));
}
return n - 1 - m;
}
#if defined(LIBSAIS_OPENMP)
static void libsais16x64_count_lms_suffixes_32s_4k(const sa_sint_t * RESTRICT T, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets)
{
const fast_sint_t prefetch_distance = 32;
memset(buckets, 0, 4 * (size_t)k * sizeof(sa_sint_t));
sa_sint_t i = n - 2;
fast_uint_t s = 1;
fast_sint_t c0 = T[n - 1];
fast_sint_t c1 = 0;
for (; i >= prefetch_distance + 3; i -= 4)
{
libsais16x64_prefetchr(&T[i - 2 * prefetch_distance]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 0], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 1], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 2], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 3], 0)]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
}
for (; i >= 0; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
}
buckets[BUCKETS_INDEX4((fast_uint_t)c0, (s << 1) & 3)]++;
}
#endif
static void libsais16x64_count_lms_suffixes_32s_2k(const sa_sint_t * RESTRICT T, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets)
{
const fast_sint_t prefetch_distance = 32;
memset(buckets, 0, 2 * (size_t)k * sizeof(sa_sint_t));
sa_sint_t i = n - 2;
fast_uint_t s = 1;
fast_sint_t c0 = T[n - 1];
fast_sint_t c1 = 0;
for (; i >= prefetch_distance + 3; i -= 4)
{
libsais16x64_prefetchr(&T[i - 2 * prefetch_distance]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 0], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 1], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 2], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 3], 0)]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
for (; i >= 0; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
buckets[BUCKETS_INDEX2((fast_uint_t)c0, 0)]++;
}
#if defined(LIBSAIS_OPENMP)
static void libsais16x64_count_compacted_lms_suffixes_32s_2k(const sa_sint_t * RESTRICT T, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets)
{
const fast_sint_t prefetch_distance = 32;
memset(buckets, 0, 2 * (size_t)k * sizeof(sa_sint_t));
sa_sint_t i = n - 2;
fast_uint_t s = 1;
fast_sint_t c0 = T[n - 1];
fast_sint_t c1 = 0;
for (; i >= prefetch_distance + 3; i -= 4)
{
libsais16x64_prefetchr(&T[i - 2 * prefetch_distance]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 0] & SAINT_MAX, 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 1] & SAINT_MAX, 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 2] & SAINT_MAX, 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 3] & SAINT_MAX, 0)]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1)));
c0 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
c1 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1)));
c0 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
c1 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
for (; i >= 0; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1)));
c1 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
c0 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c0, 0)]++;
}
#endif
static sa_sint_t libsais16x64_count_and_gather_lms_suffixes_16u(const uint16_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t * RESTRICT buckets, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
memset(buckets, 0, (size_t)4 * ALPHABET_SIZE * sizeof(sa_sint_t));
fast_sint_t m = omp_block_start + omp_block_size - 1;
if (omp_block_size > 0)
{
const fast_sint_t prefetch_distance = 128;
fast_sint_t i, j = m + 1, c0 = T[m], c1 = -1;
while (j < n && (c1 = T[j]) == c0) { ++j; }
fast_uint_t s = c0 >= c1;
for (i = m - 1, j = omp_block_start + 3; i >= j; i -= 4)
{
libsais16x64_prefetchr(&T[i - prefetch_distance]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 0); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 2); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
}
for (j -= 3; i >= j; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
}
c1 = (i >= 0) ? T[i] : -1; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
}
return (sa_sint_t)(omp_block_start + omp_block_size - 1 - m);
}
static sa_sint_t libsais16x64_count_and_gather_lms_suffixes_16u_omp(const uint16_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t * RESTRICT buckets, sa_sint_t threads, LIBSAIS_THREAD_STATE * RESTRICT thread_state)
{
sa_sint_t m = 0;
#if defined(LIBSAIS_OPENMP)
#pragma omp parallel num_threads(threads) if(threads > 1 && n >= 65536 && omp_get_dynamic() == 0)
#endif
{
#if defined(LIBSAIS_OPENMP)
fast_sint_t omp_thread_num = omp_get_thread_num();
fast_sint_t omp_num_threads = omp_get_num_threads();
#else
UNUSED(threads); UNUSED(thread_state);
fast_sint_t omp_thread_num = 0;
fast_sint_t omp_num_threads = 1;
#endif
fast_sint_t omp_block_stride = (n / omp_num_threads) & (-16);
fast_sint_t omp_block_start = omp_thread_num * omp_block_stride;
fast_sint_t omp_block_size = omp_thread_num < omp_num_threads - 1 ? omp_block_stride : n - omp_block_start;
if (omp_num_threads == 1)
{
m = libsais16x64_count_and_gather_lms_suffixes_16u(T, SA, n, buckets, omp_block_start, omp_block_size);
}
#if defined(LIBSAIS_OPENMP)
else
{
{
thread_state[omp_thread_num].state.position = omp_block_start + omp_block_size;
thread_state[omp_thread_num].state.m = libsais16x64_count_and_gather_lms_suffixes_16u(T, SA, n, thread_state[omp_thread_num].state.buckets, omp_block_start, omp_block_size);
if (thread_state[omp_thread_num].state.m > 0)
{
thread_state[omp_thread_num].state.last_lms_suffix = SA[thread_state[omp_thread_num].state.position - 1];
}
}
#pragma omp barrier
#pragma omp master
{
memset(buckets, 0, (size_t)4 * ALPHABET_SIZE * sizeof(sa_sint_t));
fast_sint_t t;
for (t = omp_num_threads - 1; t >= 0; --t)
{
m += (sa_sint_t)thread_state[t].state.m;
if (t != omp_num_threads - 1 && thread_state[t].state.m > 0)
{
memcpy(&SA[n - m], &SA[thread_state[t].state.position - thread_state[t].state.m], (size_t)thread_state[t].state.m * sizeof(sa_sint_t));
}
{
sa_sint_t * RESTRICT temp_bucket = thread_state[t].state.buckets;
fast_sint_t s; for (s = 0; s < 4 * ALPHABET_SIZE; s += 1) { sa_sint_t A = buckets[s], B = temp_bucket[s]; buckets[s] = A + B; temp_bucket[s] = A; }
}
}
}
}
#endif
}
return m;
}
static sa_sint_t libsais16x64_count_and_gather_lms_suffixes_32s_4k(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
memset(buckets, 0, 4 * (size_t)k * sizeof(sa_sint_t));
fast_sint_t m = omp_block_start + omp_block_size - 1;
if (omp_block_size > 0)
{
const fast_sint_t prefetch_distance = 32;
fast_sint_t i, j = m + 1, c0 = T[m], c1 = -1;
while (j < n && (c1 = T[j]) == c0) { ++j; }
fast_uint_t s = c0 >= c1;
for (i = m - 1, j = omp_block_start + prefetch_distance + 3; i >= j; i -= 4)
{
libsais16x64_prefetchr(&T[i - 2 * prefetch_distance]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 0], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 1], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 2], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX4(T[i - prefetch_distance - 3], 0)]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 0); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 2); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
}
for (j -= prefetch_distance + 3; i >= j; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c1, s & 3)]++;
}
c1 = (i >= 0) ? T[i] : -1; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX4((fast_uint_t)c0, s & 3)]++;
}
return (sa_sint_t)(omp_block_start + omp_block_size - 1 - m);
}
static sa_sint_t libsais16x64_count_and_gather_lms_suffixes_32s_2k(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
memset(buckets, 0, 2 * (size_t)k * sizeof(sa_sint_t));
fast_sint_t m = omp_block_start + omp_block_size - 1;
if (omp_block_size > 0)
{
const fast_sint_t prefetch_distance = 32;
fast_sint_t i, j = m + 1, c0 = T[m], c1 = -1;
while (j < n && (c1 = T[j]) == c0) { ++j; }
fast_uint_t s = c0 >= c1;
for (i = m - 1, j = omp_block_start + prefetch_distance + 3; i >= j; i -= 4)
{
libsais16x64_prefetchr(&T[i - 2 * prefetch_distance]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 0], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 1], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 2], 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 3], 0)]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 0); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 2); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
for (j -= prefetch_distance + 3; i >= j; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
c1 = (i >= 0) ? T[i] : -1; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((s & 3) == 1);
buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
}
return (sa_sint_t)(omp_block_start + omp_block_size - 1 - m);
}
static sa_sint_t libsais16x64_count_and_gather_compacted_lms_suffixes_32s_2k(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets, fast_sint_t omp_block_start, fast_sint_t omp_block_size)
{
memset(buckets, 0, 2 * (size_t)k * sizeof(sa_sint_t));
fast_sint_t m = omp_block_start + omp_block_size - 1;
if (omp_block_size > 0)
{
const fast_sint_t prefetch_distance = 32;
fast_sint_t i, j = m + 1, c0 = T[m], c1 = -1;
while (j < n && (c1 = T[j]) == c0) { ++j; }
fast_uint_t s = c0 >= c1;
for (i = m - 1, j = omp_block_start + prefetch_distance + 3; i >= j; i -= 4)
{
libsais16x64_prefetchr(&T[i - 2 * prefetch_distance]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 0] & SAINT_MAX, 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 1] & SAINT_MAX, 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 2] & SAINT_MAX, 0)]);
libsais16x64_prefetchw(&buckets[BUCKETS_INDEX2(T[i - prefetch_distance - 3] & SAINT_MAX, 0)]);
c1 = T[i - 0]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((fast_sint_t)(s & 3) == (c0 >= 0));
c0 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 1]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 0); m -= ((fast_sint_t)(s & 3) == (c1 >= 0));
c1 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
c1 = T[i - 2]; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 1); m -= ((fast_sint_t)(s & 3) == (c0 >= 0));
c0 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
c0 = T[i - 3]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i - 2); m -= ((fast_sint_t)(s & 3) == (c1 >= 0));
c1 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
for (j -= prefetch_distance + 3; i >= j; i -= 1)
{
c1 = c0; c0 = T[i]; s = (s << 1) + (fast_uint_t)(c0 > (c1 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((fast_sint_t)(s & 3) == (c1 >= 0));
c1 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c1, (s & 3) == 1)]++;
}
c1 = (i >= 0) ? T[i] : -1; s = (s << 1) + (fast_uint_t)(c1 > (c0 - (fast_sint_t)(s & 1))); SA[m] = (sa_sint_t)(i + 1); m -= ((fast_sint_t)(s & 3) == (c0 >= 0));
c0 &= SAINT_MAX; buckets[BUCKETS_INDEX2((fast_uint_t)c0, (s & 3) == 1)]++;
}
return (sa_sint_t)(omp_block_start + omp_block_size - 1 - m);
}
#if defined(LIBSAIS_OPENMP)
static fast_sint_t libsais16x64_get_bucket_stride(fast_sint_t free_space, fast_sint_t bucket_size, fast_sint_t num_buckets)
{
fast_sint_t bucket_size_1024 = (bucket_size + 1023) & (-1024); if (free_space / (num_buckets - 1) >= bucket_size_1024) { return bucket_size_1024; }
fast_sint_t bucket_size_16 = (bucket_size + 15) & (-16); if (free_space / (num_buckets - 1) >= bucket_size_16) { return bucket_size_16; }
return bucket_size;
}
static sa_sint_t libsais16x64_count_and_gather_lms_suffixes_32s_4k_fs_omp(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets, sa_sint_t threads, LIBSAIS_THREAD_STATE * RESTRICT thread_state)
{
sa_sint_t m = 0;
#if defined(LIBSAIS_OPENMP)
#pragma omp parallel num_threads(threads) if(threads > 1 && n >= 65536)
#endif
{
#if defined(LIBSAIS_OPENMP)
fast_sint_t omp_thread_num = omp_get_thread_num();
fast_sint_t omp_num_threads = omp_get_num_threads();
#else
UNUSED(threads); UNUSED(thread_state);
fast_sint_t omp_thread_num = 0;
fast_sint_t omp_num_threads = 1;
#endif
fast_sint_t omp_block_stride = (n / omp_num_threads) & (-16);
fast_sint_t omp_block_start = omp_thread_num * omp_block_stride;
fast_sint_t omp_block_size = omp_thread_num < omp_num_threads - 1 ? omp_block_stride : n - omp_block_start;
if (omp_num_threads == 1)
{
m = libsais16x64_count_and_gather_lms_suffixes_32s_4k(T, SA, n, k, buckets, omp_block_start, omp_block_size);
}
#if defined(LIBSAIS_OPENMP)
else
{
fast_sint_t bucket_size = 4 * (fast_sint_t)k;
fast_sint_t bucket_stride = libsais16x64_get_bucket_stride(buckets - &SA[n], bucket_size, omp_num_threads);
{
thread_state[omp_thread_num].state.position = omp_block_start + omp_block_size;
thread_state[omp_thread_num].state.count = libsais16x64_count_and_gather_lms_suffixes_32s_4k(T, SA, n, k, buckets - (omp_thread_num * bucket_stride), omp_block_start, omp_block_size);
}
#pragma omp barrier
if (omp_thread_num == omp_num_threads - 1)
{
fast_sint_t t;
for (t = omp_num_threads - 1; t >= 0; --t)
{
m += (sa_sint_t)thread_state[t].state.count;
if (t != omp_num_threads - 1 && thread_state[t].state.count > 0)
{
memcpy(&SA[n - m], &SA[thread_state[t].state.position - thread_state[t].state.count], (size_t)thread_state[t].state.count * sizeof(sa_sint_t));
}
}
}
else
{
omp_num_threads = omp_num_threads - 1;
omp_block_stride = (bucket_size / omp_num_threads) & (-16);
omp_block_start = omp_thread_num * omp_block_stride;
omp_block_size = omp_thread_num < omp_num_threads - 1 ? omp_block_stride : bucket_size - omp_block_start;
libsais16x64_accumulate_counts_s32(buckets + omp_block_start, omp_block_size, bucket_stride, omp_num_threads + 1);
}
}
#endif
}
return m;
}
static sa_sint_t libsais16x64_count_and_gather_lms_suffixes_32s_2k_fs_omp(const sa_sint_t * RESTRICT T, sa_sint_t * RESTRICT SA, sa_sint_t n, sa_sint_t k, sa_sint_t * RESTRICT buckets, sa_sint_t threads, LIBSAIS_THREAD_STATE * RESTRICT thread_state)
{
sa_sint_t m = 0;
#if defined(LIBSAIS_OPENMP)
#pragma omp parallel num_threads(threads) if(threads > 1 && n >= 65536)
#endif
{
#if defined(LIBSAIS_OPENMP)
fast_sint_t omp_thread_num = omp_get_thread_num();
fast_sint_t omp_num_threads = omp_get_num_threads();
#else
UNUSED(threads); UNUSED(thread_state);
fast_sint_t omp_thread_num = 0;
fast_sint_t omp_num_threads = 1;
#endif