[PATCH] D41221: [RISCV] writeNopData support generate c.nop

[Shiva Chen via Phabricator via llvm-commits]

shiva0217 created this revision.
shiva0217 added a reviewer: asb.
Herald added subscribers: sabuasal, jordy.potman.lists, johnrusso, rbar.

The assembler will generate nop for alignment. For the riscv target support C extension, it may need to generate c.nop to fix up alignment.

To support generate c.nop:

1. Add parseRISCVArch to recognize riscv triple with feature suffix.  E.g. riscv32imac
2. Recognize support C extension by triple and then emit c.nop
3. Add c.nop.s MC test case


Repository:
  rL LLVM

https://reviews.llvm.org/D41221

Files:
  lib/Support/Triple.cpp
  lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
  test/MC/RISCV/cnop.s

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