include/cityhash.h

   1 // Copyright (c) 2011 Google, Inc.
   2 //
   3 // Permission is hereby granted, free of charge, to any person obtaining a copy
   4 // of this software and associated documentation files (the "Software"), to deal
   5 // in the Software without restriction, including without limitation the rights
   6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   7 // copies of the Software, and to permit persons to whom the Software is
   8 // furnished to do so, subject to the following conditions:
   9 //
  10 // The above copyright notice and this permission notice shall be included in
  11 // all copies or substantial portions of the Software.
  12 //
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  19 // THE SOFTWARE.
  20
  21
  22 /*
  23  * Copyright (c) 2017 by Delphix. All rights reserved.
  24  */
  25
  26 #ifndef _SYS_CITYHASH_H
  27 #define _SYS_CITYHASH_H extern __attribute__((visibility("default")))
  28
  29 #include <sys/zfs_context.h>
  30
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /*
  36  * Define 1/2/3-argument specialized versions of cityhash4, which can reduce
  37  * instruction count (especially multiplication) on some 32-bit arches.
  38  */
  39 _SYS_CITYHASH_H uint64_t cityhash1(uint64_t);
  40 _SYS_CITYHASH_H uint64_t cityhash2(uint64_t, uint64_t);
  41 _SYS_CITYHASH_H uint64_t cityhash3(uint64_t, uint64_t, uint64_t);
  42 _SYS_CITYHASH_H uint64_t cityhash4(uint64_t, uint64_t, uint64_t, uint64_t);
  43
  44 #ifdef  __cplusplus
  45 }
  46 #endif
  47
  48 #endif  /* _SYS_CITYHASH_H */