bitmask.h

#ifndef SIMDJSON_LSX_BITMASK_H
#define SIMDJSON_LSX_BITMASK_H
 
#ifndef SIMDJSON_CONDITIONAL_INCLUDE
#include "simdjson/lsx/base.h"
#endif // SIMDJSON_CONDITIONAL_INCLUDE
 
namespace simdjson {
namespace lsx {
namespace {
 
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(uint64_t bitmask) {
  bitmask ^= bitmask << 1;
  bitmask ^= bitmask << 2;
  bitmask ^= bitmask << 4;
  bitmask ^= bitmask << 8;
  bitmask ^= bitmask << 16;
  bitmask ^= bitmask << 32;
  return bitmask;
}
 
} // unnamed namespace
} // namespace lsx
} // namespace simdjson
 
#endif