ceph/src/erasure-code/isa/xor_op.h

   1 /*
   2  * Ceph - scalable distributed file system
   3  *
   4  * Copyright (C) 2014 CERN (Switzerland)
   5  *                                                                                                                                                                                                           \
   6  * Author: Andreas-Joachim Peters <Andreas.Joachim.Peters@cern.ch>                                                                                                                                           \
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Lesser General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2.1 of the License, or (at your option) any later version.
  12  *
  13  */
  14
  15 #ifndef EC_ISA_XOR_OP_H
  16 #define EC_ISA_XOR_OP_H
  17
  18 // -----------------------------------------------------------------------------
  19 #include <assert.h>
  20 #include <stdint.h>
  21 // -----------------------------------------------------------------------------
  22
  23 // -------------------------------------------------------------------------
  24 // declaration of 64/128-bit vector operations depending on availability
  25 // -------------------------------------------------------------------------
  26 // -------------------------------------------------------------------------
  27
  28 #define EC_ISA_ADDRESS_ALIGNMENT 32u
  29 #define EC_ISA_VECTOR_SSE2_WORDSIZE 64u
  30
  31 #if __GNUC__ > 4 || \
  32   ( (__GNUC__ == 4) && (__GNUC_MINOR__ >= 4) ) ||\
  33   (__clang__ == 1 )
  34 #ifdef EC_ISA_VECTOR_OP_DEBUG
  35 #pragma message "* using 128-bit vector operations in " __FILE__
  36 #endif
  37
  38 // -------------------------------------------------------------------------
  39 // use 128-bit pointer
  40 // -------------------------------------------------------------------------
  41 typedef long vector_op_t __attribute__((vector_size(16)));
  42 #define EC_ISA_VECTOR_OP_WORDSIZE 16
  43 #else
  44 // -------------------------------------------------------------------------
  45 // use 64-bit pointer
  46 // -------------------------------------------------------------------------
  47 typedef unsigned long long vector_op_t;
  48 #define EC_ISA_VECTOR_OP_WORDSIZE 8
  49 #endif
  50
  51
  52 // -------------------------------------------------------------------------
  53 // check if a pointer is aligend to byte_count
  54 // -------------------------------------------------------------------------
  55 #define is_aligned(POINTER, BYTE_COUNT) \
  56   (((uintptr_t)(const void *)(POINTER)) % (BYTE_COUNT) == 0)
  57
  58 // -------------------------------------------------------------------------
  59 // compute byte-wise XOR of cw and dw block, ew contains the end address of cw
  60 // -------------------------------------------------------------------------
  61 void
  62 byte_xor(unsigned char* cw, unsigned char* dw, unsigned char* ew);
  63
  64 // -------------------------------------------------------------------------
  65 // compute word-wise XOR of cw and dw block, ew contains the end address of cw
  66 // -------------------------------------------------------------------------
  67 void
  68 vector_xor(vector_op_t* cw, vector_op_t* dw, vector_op_t* ew);
  69
  70 // -------------------------------------------------------------------------
  71 // compute region XOR like parity = src[0] ^ src[1] ... ^ src[src_size-]
  72 // -------------------------------------------------------------------------
  73 void
  74 region_xor(unsigned char** src, unsigned char* parity, int src_size, unsigned size);
  75
  76 // -------------------------------------------------------------------------
  77 // compute region XOR like parity = src[0] ^ src[1] ... ^ src[src_size-]
  78 // using SSE2 64-byte operations
  79 // -------------------------------------------------------------------------
  80 void
  81 region_sse2_xor(char** src /* array of 64-byte aligned source pointer to xor */,
  82                 char* parity /* 64-byte aligned output pointer containing the parity */,
  83                 int src_size /* size of the source pointer array */,
  84                 unsigned size /* size of the region to xor */);
  85
  86
  87 #endif // EC_ISA_XOR_OP_H