LD64
#define LD64I (LD64 | IMMED)
opcode = LD64;
if (opcode != LD64 && insn_is_zext(&insn[1]))
emit(LD64 | RS1(tmp) | RS2(G0) | RD(tmp2), ctx);
#define LDPTR LD64
#define LD64I (LD64 | IMMED)
emit(LD64 | IMMED | RS1(tmp) | S13(off) | RD(tmp), ctx);
emit(LD64 | IMMED | RS1(tmp) | S13(off) | RD(tmp), ctx);