[PATCH] D54629: [AArch64] Add command-line option for SSBS

[Pablo Barrio via Phabricator via llvm-commits]

pbarrio created this revision.
pbarrio added reviewers: olista01, samparker, aemerson.
Herald added subscribers: kristina, kristof.beyls, javed.absar.

SSBS (Speculative Store Bypass Safe) is only mandatory from 8.5
onwards but is optional from Armv8.0-A. This patch adds a command
line option to enable SSBS, as it was previously only possible to
enable by selecting -march=armv8.5-a.

Similar patch upstream in GNU binutils:
https://sourceware.org/ml/binutils/2018-09/msg00274.html


Repository:
  rL LLVM

https://reviews.llvm.org/D54629

Files:
  include/llvm/Support/AArch64TargetParser.def
  include/llvm/Support/TargetParser.h
  lib/Target/AArch64/AArch64.td
  lib/Target/AArch64/AArch64Subtarget.h
  lib/Target/AArch64/AArch64SystemOperands.td
  test/MC/AArch64/armv8.5a-specrestrict-error.s
  test/MC/AArch64/armv8.5a-specrestrict.s
  test/MC/AArch64/armv8.5a-ssbs-error.s
  test/MC/AArch64/armv8.5a-ssbs.s
  test/MC/Disassembler/AArch64/armv8.5a-specrestrict.txt
  test/MC/Disassembler/AArch64/armv8.5a-ssbs.txt
  unittests/Support/TargetParserTest.cpp

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