RBX
{"lqarx", X(31,276), XEH_MASK, POWER8, 0, {RTQ, RAX, RBX, EH}},
#define RBOPT RBX + 1
{"lswx", X(31,533), X_MASK, PPCCOM, E500|E500MC, {RT, RAX, RBX}},
BUILD_KVM_GPR_ACCESSORS(rbx, RBX)
COPY(RDI); COPY(RSI); COPY(RBP); COPY(RBX);
COPY(RDI); COPY(RSI); COPY(RBP); COPY(RBX);
case RBX:
[RBX >> 3] = HOST_BX,
case RBX:
DEFINE_LONGS(HOST_BX, RBX);