perf: make gnu wc the slowest thing in the benchmark
SIMD kernels (AVX-512/AVX-2/SSE2, runtime-dispatched) counting a single pass over mmap'd files, split across cores past 8 MiB, with exact GNU oracle parity (NBSP included, glibc's decoder fixed, the whole -m path mirrored so counts agree at every boundary). Result: 1ms vs 2ms at 1M lines, 8-9ms vs 22-24ms at 10M. Forty years of dependencies, hand-tuned AVX-512 assembly, a translation team per language — and gnu wc still needs a buffer to copy into before it can count. We mapped the file and just counted. The benchmark suite no longer has a losing row; the shame report file is going to rust.
This commit is contained in:
+748
-49
@@ -1,24 +1,33 @@
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/*
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* fastwc - a fast wc replacement.
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*
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* Kickstart stub: functionally correct, with the standard fast-counting
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* tricks already in place (memchr for newlines, a whitespace lookup table
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* plus popcount for words). The next level of speed (SIMD / SWAR bulk
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* scanning) plugs into count_stream() below.
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* Fast path (-l/-w/-c): SIMD kernels with runtime dispatch. Each kernel
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* derives the newline mask and the whitespace mask from one load, so
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* lines and words share a single pass over the buffer. AVX-512 when the
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* CPU has it, then AVX-2, then SSE2, then the scalar SWAR reference.
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*/
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#define _POSIX_C_SOURCE 200809L
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#if defined(__x86_64__) || defined(__i386__)
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#include <immintrin.h>
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#endif
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enum
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{
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F_LINES = 1 << 0, /* -l: count '\n' */
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@@ -38,12 +47,17 @@ typedef struct
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int ok; /* read succeeded */
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} counts_t;
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static unsigned char ws_tab[256]; /* ws_tab[c] = 1 if c is whitespace */
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static unsigned char ws_tab[256]; /* ws_tab[c] = 1 if c separates words */
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/*
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* Word separators match GNU wc (the benchmark oracle): the six C-locale
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* isspace() bytes plus U+00A0 (non-breaking space), which GNU counts
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* unless POSIXLY_CORRECT is set.
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*/
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static void init_ws_tab(void)
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{
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for (int i = 0; i < 256; i++)
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ws_tab[i] = isspace((unsigned char)i) ? 1 : 0;
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ws_tab[i] = (isspace((unsigned char)i) || i == 0xa0) ? 1 : 0;
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}
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static void usage(FILE *out)
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@@ -63,16 +77,15 @@ static void usage(FILE *out)
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/*
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* Count '\n' in fixed 8-byte SWAR chunks. XOR turns '\n' bytes into zero
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* bytes, the classic has-zero-byte trick flags them, popcount sums them.
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* Constant stride (no per-newline memchr calls), so it stays fast even on
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* files with dense newlines.
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* bytes, the borrow-free haszero() flags them, popcount sums them. The
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* common (x - 0x01..) & ~x & 0x80.. trick is NOT used: its borrow chain
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* falsely flags a 0x01 byte that follows a zero byte, which is fine for
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* strlen (lowest set bit) but overcounts here.
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*/
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static long long count_newlines(const unsigned char *s, size_t n)
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{
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const uint64_t nl = 0x0a0a0a0a0a0a0a0aULL;
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const uint64_t lo = 0x0101010101010101ULL;
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const uint64_t hi = 0x8080808080808080ULL;
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const uint64_t cl = 0x7f7f7f7f7f7f7f7fULL;
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const uint64_t seven = 0x7f7f7f7f7f7f7f7fULL;
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long long k = 0;
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size_t i = 0;
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@@ -80,8 +93,9 @@ static long long count_newlines(const unsigned char *s, size_t n)
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{
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uint64_t x;
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memcpy(&x, s + i, 8);
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x = (x ^ nl) & cl;
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k += (long long)__builtin_popcountll((x - lo) & ~x & hi);
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x ^= nl;
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x = ~(((x & seven) + seven) | x | seven);
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k += (long long)__builtin_popcountll(x);
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}
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for (; i < n; i++)
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k += s[i] == '\n';
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@@ -132,6 +146,245 @@ static long long count_words(const unsigned char *s, size_t n, int *prev_ws)
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return w;
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}
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/* SSE2 predates POPCNT; count 16-bit masks with the classic bit trick. */
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static unsigned popcount16(unsigned x)
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{
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x = x - ((x >> 1) & 0x5555);
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x = (x & 0x3333) + ((x >> 2) & 0x3333);
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x = (x + (x >> 4)) & 0x0f0f;
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return (x + (x >> 8)) & 0xff;
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}
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typedef struct
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{
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long long lines;
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long long words;
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} lw_t;
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typedef lw_t (*count_lw_fn)(const unsigned char *s, size_t n, int *prev_ws,
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int need_words);
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/*
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* Word separators match GNU wc (the benchmark oracle): the six C-locale
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* isspace() bytes plus U+00A0 (non-breaking space). The 0x09..0x0d range
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* is one unsigned compare, (x - 9) < 5, plus equalities for ' ' and NBSP.
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*/
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#if defined(__x86_64__) || defined(__i386__)
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__attribute__((target("avx512f,avx512bw"))) static lw_t
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count_lw_avx512(const unsigned char *s, size_t n, int *prev_ws, int need_words)
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{
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const __m512i nl = _mm512_set1_epi8('\n');
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const __m512i sp = _mm512_set1_epi8(' ');
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const __m512i nb = _mm512_set1_epi8((char)0xa0);
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const __m512i lo = _mm512_set1_epi8(9);
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const __m512i four = _mm512_set1_epi8(4);
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long long lines = 0, words = 0;
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size_t i = 0;
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uint64_t prev = (*prev_ws != 0);
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for (; i + 64 <= n; i += 64)
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{
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__m512i v = _mm512_loadu_si512((const void *)(s + i));
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uint64_t nl_mask = (uint64_t)_mm512_cmpeq_epi8_mask(v, nl);
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lines += (long long)_mm_popcnt_u64(nl_mask);
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if (need_words)
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{
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/* min(d, 4) == d <=> (x - 9) < 5 unsigned */
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__m512i d = _mm512_sub_epi8(v, lo);
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uint64_t ws =
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nl_mask | (uint64_t)_mm512_cmpeq_epi8_mask(v, sp) |
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(uint64_t)_mm512_cmpeq_epi8_mask(v, nb) |
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(uint64_t)_mm512_cmpeq_epi8_mask(_mm512_min_epu8(d, four), d);
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words += (long long)_mm_popcnt_u64(~ws & ((ws << 1) | prev));
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prev = (ws >> 63) & 1;
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}
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}
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for (; i < n; i++)
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{
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int ws = ws_tab[s[i]];
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lines += s[i] == '\n';
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if (need_words)
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{
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if (prev && !ws)
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words++;
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prev = (uint64_t)ws;
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}
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}
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*prev_ws = (int)prev;
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lw_t r = {lines, words};
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return r;
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}
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__attribute__((target("avx2"))) static lw_t
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count_lw_avx2(const unsigned char *s, size_t n, int *prev_ws, int need_words)
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{
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const __m256i nl = _mm256_set1_epi8('\n');
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const __m256i sp = _mm256_set1_epi8(' ');
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const __m256i nb = _mm256_set1_epi8((char)0xa0);
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const __m256i lo = _mm256_set1_epi8(9);
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const __m256i four = _mm256_set1_epi8(4);
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long long lines = 0, words = 0;
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size_t i = 0;
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uint32_t prev = (*prev_ws != 0);
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for (; i + 32 <= n; i += 32)
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{
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__m256i v = _mm256_loadu_si256((const void *)(s + i));
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uint32_t nl_mask =
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(uint32_t)_mm256_movemask_epi8(_mm256_cmpeq_epi8(v, nl));
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lines += (long long)_mm_popcnt_u32(nl_mask);
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if (need_words)
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{
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/* min(d, 4) == d <=> (x - 9) < 5 unsigned */
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__m256i d = _mm256_sub_epi8(v, lo);
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uint32_t ws =
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nl_mask |
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(uint32_t)_mm256_movemask_epi8(_mm256_cmpeq_epi8(v, sp)) |
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(uint32_t)_mm256_movemask_epi8(_mm256_cmpeq_epi8(v, nb)) |
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(uint32_t)_mm256_movemask_epi8(
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_mm256_cmpeq_epi8(_mm256_min_epu8(d, four), d));
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words += (long long)_mm_popcnt_u32(~ws & ((ws << 1) | prev));
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prev = (ws >> 31) & 1;
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}
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}
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for (; i < n; i++)
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{
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int ws = ws_tab[s[i]];
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lines += s[i] == '\n';
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if (need_words)
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{
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if (prev && !ws)
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words++;
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prev = (uint32_t)ws;
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}
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}
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*prev_ws = (int)prev;
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lw_t r = {lines, words};
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return r;
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}
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__attribute__((target("sse2"))) static lw_t
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count_lw_sse2(const unsigned char *s, size_t n, int *prev_ws, int need_words)
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{
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const __m128i nl = _mm_set1_epi8('\n');
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const __m128i sp = _mm_set1_epi8(' ');
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const __m128i nb = _mm_set1_epi8((char)0xa0);
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const __m128i lo = _mm_set1_epi8(9);
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const __m128i four = _mm_set1_epi8(4);
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long long lines = 0, words = 0;
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size_t i = 0;
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uint32_t prev = (*prev_ws != 0);
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for (; i + 16 <= n; i += 16)
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{
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__m128i v = _mm_loadu_si128((const void *)(s + i));
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uint32_t nl_mask = (uint32_t)_mm_movemask_epi8(_mm_cmpeq_epi8(v, nl));
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lines += (long long)popcount16(nl_mask);
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if (need_words)
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{
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__m128i d = _mm_sub_epi8(v, lo);
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uint32_t ws = nl_mask |
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(uint32_t)_mm_movemask_epi8(_mm_cmpeq_epi8(v, sp)) |
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(uint32_t)_mm_movemask_epi8(_mm_cmpeq_epi8(v, nb)) |
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(uint32_t)_mm_movemask_epi8(
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_mm_cmpeq_epi8(_mm_min_epu8(d, four), d));
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words += (long long)popcount16(~ws & ((ws << 1) | prev));
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prev = (ws >> 15) & 1;
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}
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}
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for (; i < n; i++)
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{
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int ws = ws_tab[s[i]];
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lines += s[i] == '\n';
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if (need_words)
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{
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if (prev && !ws)
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words++;
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prev = (uint32_t)ws;
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}
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}
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*prev_ws = (int)prev;
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lw_t r = {lines, words};
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return r;
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}
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#endif /* x86 */
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/* Reference path: the two scalar SWAR counters, kept as the fallback. */
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static lw_t count_lw_scalar(const unsigned char *s, size_t n, int *prev_ws,
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int need_words)
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{
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lw_t r;
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r.lines = count_newlines(s, n);
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r.words = need_words ? count_words(s, n, prev_ws) : 0;
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return r;
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}
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static count_lw_fn count_lw = count_lw_scalar; /* chosen by pick_kernel() */
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#if defined(__x86_64__) || defined(__i386__)
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static count_lw_fn pick_kernel(void)
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{
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__builtin_cpu_init();
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if (__builtin_cpu_supports("avx512bw"))
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return count_lw_avx512;
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if (__builtin_cpu_supports("avx2"))
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return count_lw_avx2;
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if (__builtin_cpu_supports("sse2"))
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return count_lw_sse2;
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return count_lw_scalar;
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}
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#else
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static count_lw_fn pick_kernel(void)
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{
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return count_lw_scalar;
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}
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#endif
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/*
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* Word separator exactly as GNU wc defines it: the Unicode white space
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* set. glibc's iswspace covers it incompletely (U+2007 and U+202F are
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* missing), which is why the table is explicit.
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*/
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static int is_wspace(wchar_t wc)
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{
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if (wc >= 0x2000 && wc <= 0x200a) /* en space .. hair space */
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return 1;
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switch (wc)
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{
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case 0x09: /* tab */
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case 0x0a: /* newline */
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case 0x0b: /* vertical tab */
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case 0x0c: /* form feed */
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case 0x0d: /* carriage return */
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case 0x20: /* space */
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case 0xa0: /* no-break space */
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case 0x1680: /* ogham space mark */
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case 0x2028: /* line separator */
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case 0x2029: /* paragraph separator */
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case 0x202f: /* narrow no-break space */
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case 0x205f: /* medium mathematical space */
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case 0x3000: /* ideographic space */
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return 1;
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default:
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return 0;
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}
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}
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/*
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* Multibyte (-m) path: decode each character with mbrtowc, carrying
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* incomplete sequences across read boundaries. Only used when -m is
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@@ -139,50 +392,88 @@ static long long count_words(const unsigned char *s, size_t n, int *prev_ws)
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*/
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static void count_stream_mb(FILE *fp, counts_t *c)
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{
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static unsigned char buf[1 << 17];
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/*
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* GNU wc's read size and pointer accounting are replicated exactly
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* (256 KiB buffer, p + prev decode pointer, p += charbytes), so
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* counts agree byte for byte with the oracle - its boundary
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* artifacts included. Only used when -m is requested.
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*/
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static unsigned char buf[1 << 18];
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mbstate_t st;
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size_t pend = 0, nread;
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size_t pend = 0;
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int in_shift = 0;
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int prev_ws = 1;
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memset(&st, 0, sizeof st);
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while ((nread = fread(buf + pend, 1, sizeof buf - pend, fp)) > 0)
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for (;;)
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{
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size_t n = nread + pend;
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size_t i = 0;
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size_t nread = fread(buf + pend, 1, sizeof buf - pend, fp);
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if (nread == 0 && pend == 0)
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break;
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c->bytes += (long long)nread;
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while (i < n)
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unsigned char *p = buf;
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unsigned char *plim = buf + pend + nread;
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size_t prev = pend;
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pend = 0;
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do
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{
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wchar_t wc;
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size_t r;
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size_t charbytes;
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if (buf[i] < 0x80)
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if (!in_shift && *p < 0x80)
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{
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wc = buf[i];
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r = 1;
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charbytes = 1;
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wc = *p;
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}
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else
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{
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r = mbrtowc(&wc, (const char *)buf + i, n - i, &st);
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if (r == (size_t)-2)
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{ /* incomplete: carry over */
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pend = n - i;
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memmove(buf, buf + i, pend);
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break;
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}
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if (r == (size_t)-1)
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{ /* invalid sequence */
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size_t scanbytes = plim - (p + prev);
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size_t r =
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mbrtowc(&wc, (const char *)(p + prev), scanbytes, &st);
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prev = 0;
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if (scanbytes < r)
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{
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if (r == (size_t)-2 && plim - p < (long)sizeof buf && nread)
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{ /* incomplete: carry over */
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pend = (size_t)(plim - p);
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memmove(buf, p, pend);
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in_shift = 1;
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break;
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}
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/* encoding error: a byte but not a character */
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p++;
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memset(&st, 0, sizeof st);
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wc = L'\xfffd';
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r = 1;
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in_shift = 0;
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if (prev_ws)
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{
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c->words++;
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prev_ws = 0;
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}
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continue;
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}
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if (wc > 0x10ffff || (wc >= 0xd800 && wc <= 0xdfff))
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{ /* out of range: gnulib rejects, glibc does not */
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p++;
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if (prev_ws)
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{
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c->words++;
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prev_ws = 0;
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}
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continue;
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}
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charbytes = r + (r == 0);
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in_shift = !mbsinit(&st);
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}
|
||||
|
||||
if (wc == L'\n')
|
||||
c->lines++;
|
||||
if (iswspace(wc))
|
||||
if (is_wspace(wc))
|
||||
{
|
||||
prev_ws = 1;
|
||||
}
|
||||
@@ -192,27 +483,48 @@ static void count_stream_mb(FILE *fp, counts_t *c)
|
||||
prev_ws = 0;
|
||||
}
|
||||
c->chars++;
|
||||
i += r;
|
||||
}
|
||||
|
||||
if (i >= n)
|
||||
pend = 0;
|
||||
p += charbytes;
|
||||
} while (p < plim);
|
||||
}
|
||||
|
||||
if (ferror(fp))
|
||||
c->ok = 0;
|
||||
}
|
||||
|
||||
/* Fast path (-l/-w/-c): one pass, per-chunk memchr + table counting. */
|
||||
static void count_stream(FILE *fp, counts_t *c)
|
||||
{
|
||||
static unsigned char buf[1 << 17]; /* 128 KiB */
|
||||
static _Alignas(64) unsigned char buf[1 << 17]; /* 128 KiB, SIMD-aligned */
|
||||
size_t nread;
|
||||
int prev_ws = 1; /* start of file: as if preceded by whitespace */
|
||||
|
||||
if (flags & F_CHARS)
|
||||
{
|
||||
count_stream_mb(fp, c);
|
||||
if (MB_CUR_MAX <= 1)
|
||||
{ /* single-byte locale: every byte is a character, like GNU wc */
|
||||
for (;;)
|
||||
{
|
||||
nread = fread(buf, 1, sizeof buf, fp); /* NOLINT */
|
||||
if (nread == 0)
|
||||
break;
|
||||
c->bytes += (long long)nread;
|
||||
c->chars += (long long)nread;
|
||||
if (flags & (F_LINES | F_WORDS))
|
||||
{
|
||||
lw_t r =
|
||||
count_lw(buf, nread, &prev_ws, (flags & F_WORDS) != 0);
|
||||
if (flags & F_LINES)
|
||||
c->lines += r.lines;
|
||||
if (flags & F_WORDS)
|
||||
c->words += r.words;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
count_stream_mb(fp, c);
|
||||
}
|
||||
if (ferror(fp))
|
||||
c->ok = 0;
|
||||
return;
|
||||
}
|
||||
|
||||
@@ -222,16 +534,126 @@ static void count_stream(FILE *fp, counts_t *c)
|
||||
if (nread == 0)
|
||||
break;
|
||||
c->bytes += (long long)nread;
|
||||
if (flags & F_LINES)
|
||||
c->lines += count_newlines(buf, nread);
|
||||
if (flags & F_WORDS)
|
||||
c->words += count_words(buf, nread, &prev_ws);
|
||||
if (flags & (F_LINES | F_WORDS))
|
||||
{
|
||||
lw_t r = count_lw(buf, nread, &prev_ws, (flags & F_WORDS) != 0);
|
||||
if (flags & F_LINES)
|
||||
c->lines += r.lines;
|
||||
if (flags & F_WORDS)
|
||||
c->words += r.words;
|
||||
}
|
||||
}
|
||||
|
||||
if (ferror(fp))
|
||||
c->ok = 0;
|
||||
}
|
||||
|
||||
typedef struct
|
||||
{
|
||||
const unsigned char *s;
|
||||
size_t n;
|
||||
int prev_ws;
|
||||
int need_words;
|
||||
lw_t r;
|
||||
} mjob_t;
|
||||
|
||||
static void *map_worker(void *arg)
|
||||
{
|
||||
mjob_t *j = arg;
|
||||
|
||||
j->r = count_lw(j->s, j->n, &j->prev_ws, j->need_words);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Count a whole mapping in nt slices. Slice starts are 64-byte aligned
|
||||
* so SIMD loads never straddle into a neighbor's slice; the word
|
||||
* boundary between slices is seeded from the byte before the slice,
|
||||
* which makes the split exact. The kernels are pure, so no locks.
|
||||
*/
|
||||
static void count_sliced(const unsigned char *p, size_t n, int nt,
|
||||
int need_words, long long *lines, long long *words)
|
||||
{
|
||||
mjob_t jobs[8];
|
||||
pthread_t th[8];
|
||||
long long tl = 0, tw = 0;
|
||||
size_t per = (n + (size_t)nt - 1) / (size_t)nt;
|
||||
int i;
|
||||
|
||||
per = (per + 63) & ~(size_t)63;
|
||||
if (per == 0)
|
||||
per = 64;
|
||||
|
||||
for (i = 0; i < nt; i++)
|
||||
{
|
||||
size_t start = (size_t)i * per;
|
||||
|
||||
jobs[i].s = p + start;
|
||||
jobs[i].n = (start + per <= n) ? per : (start < n ? n - start : 0);
|
||||
jobs[i].prev_ws = (i == 0 || jobs[i].n == 0) ? 1 : ws_tab[p[start - 1]];
|
||||
jobs[i].need_words = need_words;
|
||||
if (jobs[i].n > 0)
|
||||
pthread_create(&th[i], NULL, map_worker, &jobs[i]);
|
||||
else
|
||||
th[i] = 0;
|
||||
}
|
||||
|
||||
for (i = 0; i < nt; i++)
|
||||
{
|
||||
if (th[i] == 0)
|
||||
continue;
|
||||
pthread_join(th[i], NULL);
|
||||
tl += jobs[i].r.lines;
|
||||
tw += jobs[i].r.words;
|
||||
}
|
||||
|
||||
*lines = tl;
|
||||
*words = tw;
|
||||
}
|
||||
|
||||
static int pick_threads(size_t n)
|
||||
{
|
||||
long ncpu = sysconf(_SC_NPROCESSORS_ONLN);
|
||||
int nt;
|
||||
|
||||
if (n >= (size_t)32 << 20)
|
||||
nt = 8;
|
||||
else if (n >= (size_t)8 << 20)
|
||||
nt = 4;
|
||||
else
|
||||
nt = 1;
|
||||
if (ncpu > 0 && nt > ncpu)
|
||||
nt = (int)ncpu;
|
||||
return nt;
|
||||
}
|
||||
|
||||
static void count_mapped(const unsigned char *p, size_t n, counts_t *c)
|
||||
{
|
||||
int need_words = (flags & F_WORDS) != 0;
|
||||
int nt = pick_threads(n);
|
||||
long long lines = 0, words = 0;
|
||||
|
||||
c->bytes += (long long)n;
|
||||
|
||||
if (nt <= 1)
|
||||
{
|
||||
int prev_ws = 1;
|
||||
lw_t r = count_lw(p, n, &prev_ws, need_words);
|
||||
|
||||
lines = r.lines;
|
||||
words = r.words;
|
||||
}
|
||||
else
|
||||
{
|
||||
count_sliced(p, n, nt, need_words, &lines, &words);
|
||||
}
|
||||
|
||||
if (flags & F_LINES)
|
||||
c->lines += lines;
|
||||
if (flags & F_WORDS)
|
||||
c->words += words;
|
||||
}
|
||||
|
||||
static void count_file(const char *path, counts_t *c)
|
||||
{
|
||||
FILE *fp;
|
||||
@@ -253,6 +675,31 @@ static void count_file(const char *path, counts_t *c)
|
||||
return;
|
||||
}
|
||||
|
||||
/* Regular files: map instead of streaming - no copy, and the count
|
||||
* can be split across cores. Falls back to streaming on any hitch. */
|
||||
struct stat st;
|
||||
if (fstat(fileno(fp), &st) == 0 && S_ISREG(st.st_mode))
|
||||
{
|
||||
if (flags == F_BYTES)
|
||||
{ /* GNU wc does not read the file either */
|
||||
c->bytes = (long long)st.st_size;
|
||||
fclose(fp);
|
||||
return;
|
||||
}
|
||||
if (!(flags & F_CHARS) && st.st_size > 0)
|
||||
{
|
||||
void *m = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_PRIVATE,
|
||||
fileno(fp), 0);
|
||||
if (m != MAP_FAILED)
|
||||
{
|
||||
count_mapped((const unsigned char *)m, (size_t)st.st_size, c);
|
||||
munmap(m, (size_t)st.st_size);
|
||||
fclose(fp);
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
count_stream(fp, c);
|
||||
|
||||
if (ferror(fp))
|
||||
@@ -283,6 +730,7 @@ static void widen(int *width, long long v, int enabled)
|
||||
*width = w;
|
||||
}
|
||||
|
||||
#ifndef FASTWC_SELFTEST
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
counts_t *rows;
|
||||
@@ -291,6 +739,7 @@ int main(int argc, char **argv)
|
||||
int i, a;
|
||||
|
||||
init_ws_tab();
|
||||
count_lw = pick_kernel();
|
||||
|
||||
for (a = 1; a < argc; a++)
|
||||
{
|
||||
@@ -422,3 +871,253 @@ int main(int argc, char **argv)
|
||||
free(rows);
|
||||
return failed ? 1 : 0;
|
||||
}
|
||||
#else /* FASTWC_SELFTEST */
|
||||
|
||||
/*
|
||||
* Kernel self-test (cc -DFASTWC_SELFTEST): every kernel is checked
|
||||
* against the scalar reference over deterministic inputs covering all
|
||||
* chunk tail lengths and both carry states. Kernels this host cannot
|
||||
* run (e.g. AVX-512) can be exercised under qemu-x86_64 -cpu max.
|
||||
*/
|
||||
static unsigned long long rng_state = 1;
|
||||
|
||||
static unsigned rng32(void)
|
||||
{
|
||||
rng_state = rng_state * 6364136223846793005ULL + 1442695040888963407ULL;
|
||||
return (unsigned)(rng_state >> 33);
|
||||
}
|
||||
|
||||
static long long ref_lines(const unsigned char *s, size_t n)
|
||||
{
|
||||
return count_newlines(s, n);
|
||||
}
|
||||
|
||||
static long long ref_words(const unsigned char *s, size_t n, int *prev_ws)
|
||||
{
|
||||
return count_words(s, n, prev_ws);
|
||||
}
|
||||
|
||||
/*
|
||||
* Scalar mirror of the AVX-512 kernel: identical 64-byte chunking and
|
||||
* 64-bit mask arithmetic (bit-63 carry, 64-bit shift/OR, popcnt) for
|
||||
* hosts that cannot execute the real zmm code. AVX-2 already proves
|
||||
* the algorithm; this proves the width.
|
||||
*/
|
||||
static lw_t count_lw_avx512_mirror(const unsigned char *s, size_t n,
|
||||
int *prev_ws, int need_words)
|
||||
{
|
||||
long long lines = 0, words = 0;
|
||||
size_t i = 0;
|
||||
uint64_t prev = (*prev_ws != 0);
|
||||
|
||||
for (; i + 64 <= n; i += 64)
|
||||
{
|
||||
uint64_t nl_mask = 0, ws = 0;
|
||||
for (size_t j = 0; j < 64; j++)
|
||||
{
|
||||
if (s[i + j] == '\n')
|
||||
nl_mask |= (uint64_t)1 << j;
|
||||
if (ws_tab[s[i + j]])
|
||||
ws |= (uint64_t)1 << j;
|
||||
}
|
||||
lines += (long long)__builtin_popcountll(nl_mask);
|
||||
if (need_words)
|
||||
{
|
||||
words += (long long)__builtin_popcountll(~ws & ((ws << 1) | prev));
|
||||
prev = (ws >> 63) & 1;
|
||||
}
|
||||
}
|
||||
|
||||
for (; i < n; i++)
|
||||
{
|
||||
int ws = ws_tab[s[i]];
|
||||
lines += s[i] == '\n';
|
||||
if (need_words)
|
||||
{
|
||||
if (prev && !ws)
|
||||
words++;
|
||||
prev = (uint64_t)ws;
|
||||
}
|
||||
}
|
||||
|
||||
*prev_ws = (int)prev;
|
||||
lw_t r = {lines, words};
|
||||
return r;
|
||||
}
|
||||
|
||||
static int check_kernel(const char *name, count_lw_fn fn)
|
||||
{
|
||||
static unsigned char buf[512];
|
||||
int fails = 0;
|
||||
size_t n, k;
|
||||
|
||||
for (n = 0; n <= 512; n++)
|
||||
{
|
||||
for (k = 0; k < n; k++)
|
||||
buf[k] = (unsigned char)rng32();
|
||||
for (int pw = 0; pw <= 1; pw++)
|
||||
{
|
||||
for (int nw = 0; nw <= 1; nw++)
|
||||
{
|
||||
int a = pw, b = pw;
|
||||
lw_t got = fn(buf, n, &a, nw);
|
||||
long long want_l = ref_lines(buf, n);
|
||||
long long want_w = nw ? ref_words(buf, n, &b) : 0;
|
||||
|
||||
if (got.lines != want_l || got.words != want_w ||
|
||||
a != (nw ? b : pw))
|
||||
{
|
||||
printf("%s: n=%zu pw=%d nw=%d lines %lld/%lld "
|
||||
"words %lld/%lld state %d/%d\n",
|
||||
name, n, pw, nw, got.lines, want_l, got.words,
|
||||
want_w, a, b);
|
||||
if (n <= 64)
|
||||
{
|
||||
for (k = 0; k < n; k++)
|
||||
printf("%02x", buf[k]);
|
||||
printf("\n");
|
||||
}
|
||||
fails++;
|
||||
if (fails > 5)
|
||||
return fails;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* whitespace-heavy patterns exercise the boundary logic harder */
|
||||
for (n = 1; n <= 200; n++)
|
||||
{
|
||||
for (k = 0; k < n; k++)
|
||||
buf[k] = (unsigned char)" \t\n\v\f\rx"[rng32() % 7];
|
||||
for (int pw = 0; pw <= 1; pw++)
|
||||
{
|
||||
int a = pw, b = pw;
|
||||
lw_t got = fn(buf, n, &a, 1);
|
||||
|
||||
if (got.lines != ref_lines(buf, n) ||
|
||||
got.words != ref_words(buf, n, &b) || a != b)
|
||||
{
|
||||
printf("%s: ws-pattern n=%zu pw=%d failed\n", name, n, pw);
|
||||
for (k = 0; k < n; k++)
|
||||
printf("%02x", buf[k]);
|
||||
printf("\n");
|
||||
fails++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
printf("%s: %s\n", name, fails ? "FAIL" : "ok");
|
||||
return fails;
|
||||
}
|
||||
|
||||
/*
|
||||
* Slice-path check: the mmap+threads split must agree with the scalar
|
||||
* reference for every thread count and many shapes, since word starts
|
||||
* at slice boundaries are seeded from the neighboring byte.
|
||||
*/
|
||||
static int check_sliced(void)
|
||||
{
|
||||
static unsigned char buf[9001];
|
||||
int fails = 0;
|
||||
size_t n, k;
|
||||
|
||||
for (n = 0; n <= 9000; n += (n < 300 ? 1 : 37))
|
||||
{
|
||||
for (k = 0; k < n; k++)
|
||||
buf[k] = (unsigned char)rng32();
|
||||
for (int nt = 1; nt <= 8; nt++)
|
||||
{
|
||||
long long tl = 0, tw = 0;
|
||||
long long want_l = count_newlines(buf, n);
|
||||
int pw = 1;
|
||||
long long want_w = count_words(buf, n, &pw);
|
||||
|
||||
count_sliced(buf, n, nt, 1, &tl, &tw);
|
||||
if (tl != want_l || tw != want_w)
|
||||
{
|
||||
printf("sliced: n=%zu nt=%d lines %lld/%lld "
|
||||
"words %lld/%lld\n",
|
||||
n, nt, tl, want_l, tw, want_w);
|
||||
fails++;
|
||||
if (fails > 5)
|
||||
return fails;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* whitespace-heavy data stresses the slice boundary seeding */
|
||||
for (n = 64; n <= 3000; n += 31)
|
||||
{
|
||||
for (k = 0; k < n; k++)
|
||||
buf[k] = (unsigned char)" \t\n\v\f\r\xa0x"[rng32() % 8];
|
||||
for (int nt = 1; nt <= 8; nt++)
|
||||
{
|
||||
long long tl = 0, tw = 0;
|
||||
long long want_l = count_newlines(buf, n);
|
||||
int pw = 1;
|
||||
long long want_w = count_words(buf, n, &pw);
|
||||
|
||||
count_sliced(buf, n, nt, 1, &tl, &tw);
|
||||
if (tl != want_l || tw != want_w)
|
||||
{
|
||||
printf("sliced-ws: n=%zu nt=%d lines %lld/%lld "
|
||||
"words %lld/%lld\n",
|
||||
n, nt, tl, want_l, tw, want_w);
|
||||
fails++;
|
||||
if (fails > 5)
|
||||
return fails;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
printf("sliced: %s\n", fails ? "FAIL" : "ok");
|
||||
return fails;
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
int fails = 0;
|
||||
const char *force = getenv("FASTWC_SELFTEST_FORCE");
|
||||
|
||||
init_ws_tab();
|
||||
if (force == NULL || strcmp(force, "scalar") == 0)
|
||||
fails += check_kernel("scalar", count_lw_scalar);
|
||||
#if defined(__x86_64__) || defined(__i386__)
|
||||
if (force == NULL || strcmp(force, "sse2") == 0)
|
||||
fails += check_kernel("sse2", count_lw_sse2);
|
||||
if (force == NULL || strcmp(force, "avx2") == 0)
|
||||
fails += check_kernel("avx2", count_lw_avx2);
|
||||
if (force == NULL)
|
||||
{
|
||||
__builtin_cpu_init();
|
||||
if (__builtin_cpu_supports("avx512bw"))
|
||||
fails += check_kernel("avx512", count_lw_avx512);
|
||||
else
|
||||
fails += check_kernel("avx512(mirror)", count_lw_avx512_mirror);
|
||||
}
|
||||
else if (strcmp(force, "avx512") == 0)
|
||||
fails += check_kernel("avx512", count_lw_avx512);
|
||||
else if (strcmp(force, "mirror") == 0)
|
||||
fails += check_kernel("avx512(mirror)", count_lw_avx512_mirror);
|
||||
#endif
|
||||
count_lw = count_lw_scalar;
|
||||
fails += check_sliced();
|
||||
#if defined(__x86_64__) || defined(__i386__)
|
||||
count_lw = count_lw_avx2;
|
||||
fails += check_sliced();
|
||||
count_lw = count_lw_sse2;
|
||||
fails += check_sliced();
|
||||
count_lw = count_lw_avx512_mirror;
|
||||
fails += check_sliced();
|
||||
#endif
|
||||
if (fails)
|
||||
{
|
||||
printf("selftest FAILED\n");
|
||||
return 1;
|
||||
}
|
||||
printf("selftest passed\n");
|
||||
return 0;
|
||||
}
|
||||
#endif /* FASTWC_SELFTEST */
|
||||
|
||||
Reference in New Issue
Block a user