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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright © 2012 Google, Inc.
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 * Google Author(s): Behdad Esfahbod
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25 */
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26
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27 #ifndef HB_CACHE_HH
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28 #define HB_CACHE_HH
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30 #include "hb.hh"
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32
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33 /* Implements a lockfree cache for int->int functions. */
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34
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35 template <unsigned int key_bits=16,
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36 unsigned int value_bits=8 + 32 - key_bits,
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37 unsigned int cache_bits=8,
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38 bool thread_safe=true>
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39 struct hb_cache_t
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40 {
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41 using item_t = typename std::conditional<thread_safe,
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42 hb_atomic_int_t,
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43 typename std::conditional<key_bits + value_bits - cache_bits <= 16,
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44 short,
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45 int>::type
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46 >::type;
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47
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48 static_assert ((key_bits >= cache_bits), "");
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49 static_assert ((key_bits + value_bits <= cache_bits + 8 * sizeof (item_t)), "");
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50
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51 void init () { clear (); }
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52 void fini () {}
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53
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54 void clear ()
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55 {
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56 for (unsigned i = 0; i < ARRAY_LENGTH (values); i++)
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57 values[i] = -1;
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58 }
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59
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60 bool get (unsigned int key, unsigned int *value) const
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61 {
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62 unsigned int k = key & ((1u<<cache_bits)-1);
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63 unsigned int v = values[k];
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64 if ((key_bits + value_bits - cache_bits == 8 * sizeof (item_t) && v == (unsigned int) -1) ||
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65 (v >> value_bits) != (key >> cache_bits))
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66 return false;
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67 *value = v & ((1u<<value_bits)-1);
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68 return true;
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69 }
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70
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71 bool set (unsigned int key, unsigned int value)
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72 {
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73 if (unlikely ((key >> key_bits) || (value >> value_bits)))
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74 return false; /* Overflows */
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75 unsigned int k = key & ((1u<<cache_bits)-1);
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76 unsigned int v = ((key>>cache_bits)<<value_bits) | value;
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77 values[k] = v;
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78 return true;
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79 }
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80
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81 private:
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82 item_t values[1u<<cache_bits];
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83 };
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84
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85
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86 #endif /* HB_CACHE_HH */