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require_rv64;
require_extension('B');
reg_t x = RS1;
int shamt = RS2 & 15;
if (shamt & 1) x = (x & 0x9999999999999999LL) | ((x & 0x4444444444444444LL) >> 1) | ((x & 0x2222222222222222LL) << 1);
if (shamt & 2) x = (x & 0xC3C3C3C3C3C3C3C3LL) | ((x & 0x3030303030303030LL) >> 2) | ((x & 0x0C0C0C0C0C0C0C0CLL) << 2);
if (shamt & 4) x = (x & 0xF00FF00FF00FF00FLL) | ((x & 0x0F000F000F000F00LL) >> 4) | ((x & 0x00F000F000F000F0LL) << 4);
if (shamt & 8) x = (x & 0xFF0000FFFF0000FFLL) | ((x & 0x00FF000000FF0000LL) >> 8) | ((x & 0x0000FF000000FF00LL) << 8);
WRITE_RD(sext32(x));
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