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// Zbb contains rev8 but not general grevi
// Zbkb contains rev8 and brev8 (a.k.a. rev.b) but not general grevi
int shamt = SHAMT;
require(((shamt == xlen - 8) && (p->extension_enabled(EXT_ZBB) || p->extension_enabled(EXT_ZBKB))) //rev8
|| ((shamt == 7) && p->extension_enabled(EXT_ZBKB)) // rev8.b
|| ((shamt == 8) && p->extension_enabled(EXT_ZPN)) // rev8.h
|| ((shamt == xlen - 1) && p->extension_enabled(EXT_ZPN)) // rev
|| p->extension_enabled(EXT_XZBP));
require(shamt < xlen);
reg_t x = RS1;
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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