[PATCH] aarch64: Add command-line support for Armv8.7-a

[Kyrylo Tkachov via Gcc-patches]

Hi all,

This patch adds support for -march=armv8.7-a in GCC.
It adds the +ls64 extension that's included in this architecture revision.
Currently this is just the command-line option and +ls64 allows the relevant 
instructions
to be used in inline assembly. The ACLE defines some intrinsics for them but 
those can be
added separately later (together with the appropriate __ARM_FEATURE_* 
predefine).

Bootstrapped and tested on aarch64-none-linux-gnu.
Pushing to trunk.
Thanks,
Kyrill

2021-09-27  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

        * config/aarch64/aarch64.h (AARCH64_FL_LS64): Define
        (AARCH64_FL_V8_7): Likewise.
        (AARCH64_FL_FOR_ARCH8_7): Likewise.
        * config/aarch64/aarch64-arches.def (armv8.7-a): Define.
        * config/aarch64/aarch64-option-extensions.def (ls64): Define.
        * doc/invoke.texi: Document the above.

v87.patch
Description: v87.patch