GNU Toolchain Begins Adding ARMv8.7-A Support
Written by Michael Larabel in Arm on 29 October 2020 at 12:05 AM EDT. Add A Comment
ARM --
The GNU compiler toolchain has begun landing Arm's contributions around ARMv8.7-A architecture support.

While all of the ARMv8 cores to date remain with older versions of the architecture and even cases like ARMv8.2-A with the Cortex-A78 and X1, Arm continues working on new ARMv8 revisions and getting that software support in place well ahead of hardware availability.

After outlining some of the ARMv8.7-A register changes in September, the GNU toolchain bits began appearing on Tuesday but still are a work in progress.

The GNU Assembler saw -march=armv8.7-a support added. That was followed up by enabling DSB and WFET so far as two new instructions with ARMv8.7-A. The DSB nXS variant is extending the memory barrier behavior with new capabilities. The WFET instruction is to "Wait For Event with Timeout" where specified is a general purpose source register.

That's it so far but expect more soon along with the GCC compiler bring-up and on the LLVM/Clang side too.
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