[all-commits] [llvm/llvm-project] 31f951: [TableGen][CodeEmitter] Introducing the VarLenCode...

[Min-Yih Hsu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 31f9519d48c26bd542253cc20dc333732c991332
      https://github.com/llvm/llvm-project/commit/31f9519d48c26bd542253cc20dc333732c991332
  Author: Min-Yih Hsu <minyihh at uci.edu>
  Date:   2022-02-11 (Fri, 11 Feb 2022)

  Changed paths:
    M llvm/include/llvm/Target/Target.td
    A llvm/test/TableGen/VarLenEncoder.td
    M llvm/utils/TableGen/CMakeLists.txt
    M llvm/utils/TableGen/CodeEmitterGen.cpp
    A llvm/utils/TableGen/VarLenCodeEmitterGen.cpp
    A llvm/utils/TableGen/VarLenCodeEmitterGen.h

  Log Message:
  -----------
  [TableGen][CodeEmitter] Introducing the VarLenCodeEmitterGen infrastructure

Full write up:
https://gist.github.com/mshockwave/66e98d099256deefc062633909bb7b5b

The existing CodeEmitterGen infrastructure is unable to generate encoder
function for ISAs with variable-length instructions. This patch
introduces a new infrastructure to support variable-length instruction
encoding, including a new TableGen syntax for writing instruction
encoding directives and a new TableGen backend component,
VarLenCodeEmitterGen, built on top of CodeEmitterGen.

Differential Revision: https://reviews.llvm.org/D115128


  Commit: 08f2b0dcf61fbe037d363c1e6ff20aaee4875dfe
      https://github.com/llvm/llvm-project/commit/08f2b0dcf61fbe037d363c1e6ff20aaee4875dfe
  Author: Min-Yih Hsu <minyihh at uci.edu>
  Date:   2022-02-11 (Fri, 11 Feb 2022)

  Changed paths:
    M llvm/lib/Target/M68k/CMakeLists.txt
    M llvm/lib/Target/M68k/M68kInstrArithmetic.td
    M llvm/lib/Target/M68k/M68kInstrFormats.td
    M llvm/lib/Target/M68k/M68kInstrInfo.td
    M llvm/lib/Target/M68k/MCTargetDesc/M68kMCCodeEmitter.cpp
    M llvm/test/CodeGen/M68k/Control/cmp.ll
    M llvm/test/MC/Disassembler/M68k/arithmetic.txt

  Log Message:
  -----------
  [M68k] Adopt the new VarLenCodeEmitterGen for arithmetic instructions

This patch refactors all the existing M68k arithmetic instructions
to use the new VarLenCodeEmitterGen infrastructure.

This patch is tested by the existing MC test cases.

Note that one of the codegen tests needed to be updated because the
ordering of two equivalent instructions were switched.

Differential Revision: https://reviews.llvm.org/D115234


Compare: https://github.com/llvm/llvm-project/compare/b59ad64eadc0...08f2b0dcf61f