The latest MTE specification adds register Xt to the STG instruction family:
STG [Xn, #offset] -> STG Xt, [Xn, #offset]
The tag written to memory is taken from Xt rather than Xn.
Also, the LDG instruction also was changed to read return address from Xt:
LDG Xt, [Xn, #offset].
This patch includes those changes and tests.
Specification is at: https://developer.arm.com/docs/ddi0596/c
Differential Revision: https://reviews.llvm.org/D60188
llvm-svn: 357583
5820db93c9