[PATCH] D50885: [AArch64][SVE] Asm: Add SVE System registers

[Sander de Smalen via Phabricator via llvm-commits]

sdesmalen created this revision.
sdesmalen added reviewers: SjoerdMeijer, samparker, pbarrio, fhahn.
Herald added a reviewer: javed.absar.
Herald added subscribers: rkruppe, kristof.beyls, tschuett.

This patch adds system registers for controlling aspects of SVE:

- ZCR_EL1  (r/w)   visible at EL1 and EL0.
- ZCR_EL2  (r/w)   visible at EL2 and Non-secure EL1 and EL0.
- ZCR_EL3  (r/w)   visible at all exception levels.

and a system register identifying SVE:

- ID_AA64ZFR0_EL1  (r)  SVE Feature identifier.


https://reviews.llvm.org/D50885

Files:
  lib/Target/AArch64/AArch64SystemOperands.td
  test/MC/AArch64/arm64-system-encoding.s
  test/MC/AArch64/basic-a64-diagnostics.s

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