[all-commits] [llvm/llvm-project] 5066d7: [RISCV] Add Xqccmp 0.1 Assembly Support (#128731)

[Sam Elliott via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5066d7b60186fe0d557223493a17c3aa9a06f58f
      https://github.com/llvm/llvm-project/commit/5066d7b60186fe0d557223493a17c3aa9a06f58f
  Author: Sam Elliott <quic_aelliott at quicinc.com>
  Date:   2025-02-26 (Wed, 26 Feb 2025)

  Changed paths:
    M clang/test/Driver/print-supported-extensions-riscv.c
    M llvm/docs/RISCVUsage.rst
    M llvm/docs/ReleaseNotes.md
    M llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
    M llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
    M llvm/lib/Target/RISCV/RISCVFeatures.td
    M llvm/lib/Target/RISCV/RISCVInstrInfo.td
    A llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
    M llvm/lib/TargetParser/RISCVISAInfo.cpp
    M llvm/test/CodeGen/RISCV/attributes.ll
    A llvm/test/MC/RISCV/rv32xqccmp-invalid.s
    A llvm/test/MC/RISCV/rv32xqccmp-valid.s
    A llvm/test/MC/RISCV/rv64e-xqccmp-valid.s
    A llvm/test/MC/RISCV/rv64xqccmp-invalid.s
    A llvm/test/MC/RISCV/rv64xqccmp-valid.s
    M llvm/unittests/TargetParser/RISCVISAInfoTest.cpp

  Log Message:
  -----------
  [RISCV] Add Xqccmp 0.1 Assembly Support (#128731)

Xqccmp is a new spec by Qualcomm that makes a vendor-specific effort to
solve the push/pop + frame pointers issue. Broadly, it takes the Zcmp
instructions and reverse the order they push/pop registers in, which
ends up matching the frame pointer convention.

This extension adds a new instruction not present in Zcmp,
`qc.cm.pushfp`, which will set `fp` to the incoming `sp` value after it
has pushed the registers.

This change duplicates the Zcmp implementation, with minor changes to
mnemonics (for the `qc.` prefix), predicates, and the addition of
`qc.cm.pushfp`. There is also new logic to prevent combining Xqccmp and
Zcmp. Xqccmp is kept separate to Xqci for decoding/encoding etc, as the
specs are separate today.

Specification:
https://github.com/quic/riscv-unified-db/releases/tag/Xqccmp_extension-0.1.0



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