3 ms·

It’s not a standard ARM register; it’s implementation-defined and nobody gave it a meaningful name. It appears to do nothing much.

• exikyut 5y ago
  Then why not unofficially standardize its use in GCC and Clang's register-pooling subsystem?
  • saagarjha 5y ago
    Because GCC and Clang don't get to decide what hardware does with the register…