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// Zbb contains rev8 but not general grevi
if (SHAMT == xlen - 8)
require_extension(EXT_ZBB);
else
require_extension(EXT_XBITMANIP);
require(SHAMT < xlen);
reg_t x = RS1;
int shamt = SHAMT;
if (shamt & 1) x = ((x & 0x5555555555555555LL) << 1) | ((x & 0xAAAAAAAAAAAAAAAALL) >> 1);
if (shamt & 2) x = ((x & 0x3333333333333333LL) << 2) | ((x & 0xCCCCCCCCCCCCCCCCLL) >> 2);
if (shamt & 4) x = ((x & 0x0F0F0F0F0F0F0F0FLL) << 4) | ((x & 0xF0F0F0F0F0F0F0F0LL) >> 4);
if (shamt & 8) x = ((x & 0x00FF00FF00FF00FFLL) << 8) | ((x & 0xFF00FF00FF00FF00LL) >> 8);
if (shamt & 16) x = ((x & 0x0000FFFF0000FFFFLL) << 16) | ((x & 0xFFFF0000FFFF0000LL) >> 16);
if (shamt & 32) x = ((x & 0x00000000FFFFFFFFLL) << 32) | ((x & 0xFFFFFFFF00000000LL) >> 32);
WRITE_RD(sext_xlen(x));
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