gistfile1.c

void x64_backend_mov_value(struct x64_backend *backend, const Xbyak::Reg &rd,
                           const struct ir_value *v) {
  auto &e = *backend->codegen;

  if (ir_is_constant(v)) {
    e.mov(rd, ir_zext_constant(v));
    return;
  }

  Xbyak::Reg ra = x64_backend_reg(backend, v);

  if (rd.isBit(64) && ra.isBit(64)) {
    e.mov(rd, ra);
  } else if (rd.isBit(64) && ra.isBit(32)) {
    /* mov will automatically zero fill the upper 32-bits */
    e.mov(rd.cvt32(), ra);
  } else {
    e.movzx(rd, ra);
  }
}