[PATCH][AArch64] Enable access to the whole MRS/MSR system reg encoding space

[Tom Coxon]

Hi all,

The attached patch enables access to the whole space of ARMv8-A system registers through the S<op0>_<op1>_<Cn>_<Cm>_<op2> syntax.

This is useful to anyone needing to write assembly code supporting new system registers before the assembler has learned the official names for them.

Although this is a real use case, it is niche and most users should still use the official system registers names. In order to avoid encouraging general use of this syntax, ARM is not planning to document this in the ARMARM.

Regards,
Tom

Files changed:
 lib/Target/AArch64/AArch64InstrFormats.td          |   12 +++----
 .../AArch64/Disassembler/AArch64Disassembler.cpp   |   24 +++----------
 .../AArch64/InstPrinter/AArch64InstPrinter.cpp     |   12 +++----
 lib/Target/AArch64/Utils/AArch64BaseInfo.cpp       |   36 +++++++-------------
 lib/Target/AArch64/Utils/AArch64BaseInfo.h         |    2 +-
 test/MC/AArch64/arm64-system-encoding.s            |    4 +++
 test/MC/AArch64/basic-a64-diagnostics.s            |   16 ++++-----
 test/MC/AArch64/basic-a64-instructions.s           |    8 +++--
 8 files changed, 44 insertions(+), 70 deletions(-)
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