+* Add support for ETMv4 (Embedded Trace Macrocell), ETE (Embedded Trace
+ Extension), TRBE (Trace Buffer Extension)and BRBE (Branch Record Buffer
+ Extension) system registers for AArch64.
+
+* Add support for Armv8-R and Armv8.7-A AArch64.
+
+* Add support for DSB memory nXS barrier, WFET and WFIT instruction for Armv8.7
+ AArch64.
+
+* Add support for +flagm feature for -march in Armv8.4 AArch64.
+
+* Add support for +ls64 feature for -march in Armv8.7 AArch64. Add atomic
+ 64-byte load/store instructions for this feature.
+
+* Add support for +pauth (Pointer Authentication) feature for -march in
+ AArch64.