size_to_mask
instr->zeroextend_mask = ~size_to_mask(4);
instr->zeroextend_mask = ~size_to_mask(4);
instr->zeroextend_mask |= size_to_mask(instr->operand_size);
instr->zeroextend_mask &= ~size_to_mask(opcode->defsize);
val &= size_to_mask(instr->address_size);
mask = size_to_mask(adsize);
mask = size_to_mask(adsize);
gva &= size_to_mask(exit->u.io.address_size);
state->gprs[NVMM_X64_GPR_RAX] &= size_to_mask(4);