count, popcount, sideways sum, bit summation, or Hamming weight. The GCC builtin function __builtin_popcountl (unsigned long x) for LP64 is implemented using software counters incremented by a srai rd,rd,K, where K is XLEN-32 and XLEN-16, respectively. Included in Extension Minimum version Lifecycle state Zbb (Basic bit-manipulation) 0.93 Ratified Zbkb (Zbkb-sc) v1.0.0-rc4 Ratified
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