[Bug gas/25332] Error: selected processor does not support `stclrb w2,[x1]' for cortex-a53

[petemoore at gmx dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=25332

--- Comment #1 from Pete Moore <petemoore at gmx dot net> ---
Digging a little deeper, it looks like this instruction is part of
"ARMv8.1-LSE, Armv8.1 Large System Extensions".

>From the Arm Cortex-A53 MPCore Processor Technical Reference Manual, it isn't
clear to me if the Cortex A53 supports ARMv8.1, but
https://en.wikipedia.org/wiki/Comparison_of_ARMv8-A_cores suggests it only
supports ARMv8.0-A, so maybe this is an invalid bug.

Apologies if this is the case, although I'd be grateful if someone can confirm
for sure. The TRM states "The Cortex-A53 processor implements the Armv8-A
architecture" but I don't see a reference to the version of Armv8-A that it
supports in that document, but if the wiki page is correct, that would explain
why gas gives this error message...

Many thanks!

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