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https://github.com/jart/cosmopolitan.git
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1ff9ab95ac
This change enables Address Sanitizer systemically w/ `make MODE=dbg`. Our version of Rust's `unsafe` keyword is named `noasan` which is used for two functions that do aligned memory chunking, like `strcpy.c` and we need to fix the tiny DEFLATE code, but that's it everything else is fabulous you can have all the fischer price security blankets you need Best of all is we're now able to use the ASAN data in Blinkenlights to colorize the memory dumps. See the screenshot below of a test program: https://justine.lol/blinkenlights/asan.png Which is operating on float arrays stored on the stack, with red areas indicating poisoned memory, and the green areas indicate valid memory.
95 lines
5.7 KiB
C
95 lines
5.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/internal.h"
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/**
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* Hashes data with hardware acceleration at 10GBps.
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* @note needs Nehalem+ c. 2008 or Bulldozer+ c. 2011
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*/
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optimizespeed uint32_t crc32c$sse42(uint32_t init, const void *data, size_t n) {
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const unsigned char *p = (const unsigned char *)data;
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const unsigned char *pe = (const unsigned char *)data + n;
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uint32_t h = init ^ 0xffffffff;
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if (n >= 16 + 8) {
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while ((uintptr_t)p & 7) asm("crc32b\t%1,%0" : "+r"(h) : "rm"(*p++));
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uint64_t hl = h;
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while (p < pe - 16ul) {
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asm("crc32q\t%1,%0" : "+r"(hl) : "rm"(*(const uint64_t *)p));
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p += 8;
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asm("crc32q\t%1,%0" : "+r"(hl) : "rm"(*(const uint64_t *)p));
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p += 8;
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}
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h = (uint32_t)hl;
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}
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while (p < pe) asm("crc32b\t%1,%0" : "+r"(h) : "rm"(*p++));
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return h ^ 0xffffffff;
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}
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/*
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bench_crc32c$sse42 for #c per n where c ≈ 0.293ns
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N x1 x8 x64 mBps
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------------------------------------------------------------
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1 877.000 43.375 40.359 81
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1 45.000 39.625 40.484 80
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2 34.500 27.562 20.461 159
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3 23.000 16.708 14.245 228
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4 18.250 13.094 11.449 284
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7 10.429 8.339 8.185 397
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8 42.125 8.734 6.850 475
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15 9.400 5.375 4.884 665
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16 7.312 5.070 4.882 666
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31 5.258 2.923 2.680 1213
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32 3.969 2.676 2.562 1269
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63 3.095 1.581 1.428 2276
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64 2.234 1.623 1.478 2199
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127 1.205 0.901 0.900 3610
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128 1.164 0.960 0.915 3552
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255 0.922 0.651 0.618 5260
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256 0.715 0.650 0.609 5341
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511 0.558 0.482 0.477 6819
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512 0.529 0.475 0.469 6932
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1023 0.425 0.400 0.396 8204
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1024 0.417 0.392 0.388 8383
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2047 0.367 0.355 0.353 9199
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2048 0.374 0.366 0.364 8929
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4095 0.351 0.338 0.337 9644
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4096 0.353 0.338 0.338 9624
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8191 0.335 0.338 0.337 9641
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8192 0.335 0.329 0.329 9870
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16383 0.336 0.325 0.325 10011
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16384 0.336 0.326 0.375 8666
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32767 0.329 0.323 0.323 10070
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32768 0.327 0.324 0.323 10062
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65535 0.322 0.322 0.322 10103
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65536 0.321 0.322 0.322 10102
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131071 0.322 0.321 0.321 10125
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131072 0.321 0.321 0.321 10124
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262143 0.322 0.321 0.335 9699
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262144 0.321 0.321 0.321 10134
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524287 0.321 0.321 0.499 6516
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524288 0.321 0.321 0.339 9575
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1048575 0.322 0.321 0.322 10095
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1048576 0.320 1.001 0.323 10048
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2097151 0.325 0.321 0.322 10086
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2097152 0.330 0.320 0.323 10076
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4194303 0.331 0.322 0.321 10128
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4194304 0.332 0.321 0.325 10004
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8388607 0.334 0.332 0.331 9829
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8388608 0.334 0.329 0.327 9934
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*/
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