[PATCH] D137431: [AArch64] RME MEC instructions and system registers

[Keith Walker via Phabricator via llvm-commits]

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This patch adds assembler/disassembler support for
RME MEC (Memory Encryption Contexts).

Cache maintence instructions added:

- DC CIPAPA
- DC CIGDPAPA

System registers added:

- MECIDR_EL2
- MECID_P0_EL2
- MECID_A0_EL2
- MECID_P1_EL2
- MECID_A1_EL2
- VMECID_P_EL2
- VMECID_A_EL2
- MECID_RL_A_EL3

Memory Encryption Contexts were announced in

  https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/arm-a-profile-architecture-2022  

The instruction encodings for the MEC feature is available at

  https://developer.arm.com/documentation/ddi0602/2022-09/Base-Instructions/DC--Data-Cache-operation--an-alias-of-SYS-?lang=en

The system register encodings available at

  https://developer.arm.com/documentation/ddi0601/2022-09/AArch64-Registers?lang=en

Based on patches by Son Tuan Vu


https://reviews.llvm.org/D137431

Files:
  llvm/docs/ReleaseNotes.rst
  llvm/lib/Target/AArch64/AArch64.td
  llvm/lib/Target/AArch64/AArch64SystemOperands.td
  llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  llvm/test/MC/AArch64/armv9a-mec.s
  llvm/test/MC/Disassembler/AArch64/armv9a-mec.txt

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