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diff --git a/src/ceph/src/erasure-code/isa/xor_op.h b/src/ceph/src/erasure-code/isa/xor_op.h
new file mode 100644
index 0000000..978b9a9
--- /dev/null
+++ b/src/ceph/src/erasure-code/isa/xor_op.h
@@ -0,0 +1,87 @@
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 CERN (Switzerland)
+ *                                                                                                                                                                                                           \
+ * Author: Andreas-Joachim Peters <Andreas.Joachim.Peters@cern.ch>                                                                                                                                           \
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef EC_ISA_XOR_OP_H
+#define EC_ISA_XOR_OP_H
+
+// -----------------------------------------------------------------------------
+#include <assert.h>
+#include <stdint.h>
+// -----------------------------------------------------------------------------
+
+// -------------------------------------------------------------------------
+// declaration of 64/128-bit vector operations depending on availability
+// -------------------------------------------------------------------------
+// -------------------------------------------------------------------------
+
+#define EC_ISA_ADDRESS_ALIGNMENT 32u
+#define EC_ISA_VECTOR_SSE2_WORDSIZE 64u
+
+#if __GNUC__ > 4 || \
+  ( (__GNUC__ == 4) && (__GNUC_MINOR__ >= 4) ) ||\
+  (__clang__ == 1 )
+#ifdef EC_ISA_VECTOR_OP_DEBUG
+#pragma message "* using 128-bit vector operations in " __FILE__
+#endif
+
+// -------------------------------------------------------------------------
+// use 128-bit pointer
+// -------------------------------------------------------------------------
+typedef long vector_op_t __attribute__((vector_size(16)));
+#define EC_ISA_VECTOR_OP_WORDSIZE 16
+#else
+// -------------------------------------------------------------------------
+// use 64-bit pointer
+// -------------------------------------------------------------------------
+typedef unsigned long long vector_op_t;
+#define EC_ISA_VECTOR_OP_WORDSIZE 8
+#endif
+
+
+// -------------------------------------------------------------------------
+// check if a pointer is aligend to byte_count
+// -------------------------------------------------------------------------
+#define is_aligned(POINTER, BYTE_COUNT) \
+  (((uintptr_t)(const void *)(POINTER)) % (BYTE_COUNT) == 0)
+
+// -------------------------------------------------------------------------
+// compute byte-wise XOR of cw and dw block, ew contains the end address of cw
+// -------------------------------------------------------------------------
+void
+byte_xor(unsigned char* cw, unsigned char* dw, unsigned char* ew);
+
+// -------------------------------------------------------------------------
+// compute word-wise XOR of cw and dw block, ew contains the end address of cw
+// -------------------------------------------------------------------------
+void
+vector_xor(vector_op_t* cw, vector_op_t* dw, vector_op_t* ew);
+
+// -------------------------------------------------------------------------
+// compute region XOR like parity = src[0] ^ src[1] ... ^ src[src_size-]
+// -------------------------------------------------------------------------
+void
+region_xor(unsigned char** src, unsigned char* parity, int src_size, unsigned size);
+
+// -------------------------------------------------------------------------
+// compute region XOR like parity = src[0] ^ src[1] ... ^ src[src_size-]
+// using SSE2 64-byte operations
+// -------------------------------------------------------------------------
+void
+region_sse2_xor(char** src /* array of 64-byte aligned source pointer to xor */,
+                char* parity /* 64-byte aligned output pointer containing the parity */,
+                int src_size /* size of the source pointer array */,
+                unsigned size /* size of the region to xor */);
+
+
+#endif // EC_ISA_XOR_OP_H