[all-commits] [llvm/llvm-project] 20b572: [RISCV] Implement the implications of C extension ...

[Jesse Huang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 20b5728b7b1ccc4509a316efb270d46cc9526d69
      https://github.com/llvm/llvm-project/commit/20b5728b7b1ccc4509a316efb270d46cc9526d69
  Author: Jesse Huang <jesse.huang at sifive.com>
  Date:   2025-03-22 (Sat, 22 Mar 2025)

  Changed paths:
    M clang/test/CodeGen/RISCV/riscv-func-attr-target.c
    M clang/test/CodeGen/attr-target-clones-riscv.c
    M clang/test/CodeGen/attr-target-version-riscv.c
    M clang/test/CodeGenCXX/attr-target-clones-riscv.cpp
    M clang/test/CodeGenCXX/attr-target-version-riscv.cpp
    M llvm/lib/Target/RISCV/RISCVFeatures.td
    M llvm/lib/TargetParser/RISCVISAInfo.cpp
    M llvm/test/CodeGen/RISCV/attributes.ll
    M llvm/test/MC/RISCV/attribute-arch.s
    M llvm/test/MC/RISCV/attribute.s
    M llvm/test/MC/RISCV/option-arch.s
    M llvm/unittests/TargetParser/RISCVISAInfoTest.cpp

  Log Message:
  -----------
  [RISCV] Implement the implications of C extension (#132259)

Implement the following implications according to the [Zc
spec](https://github.com/riscvarchive/riscv-code-size-reduction/blob/main/Zc-specification/Zc.adoc#13-c)

> As C defines the same instructions as Zca, Zcf and Zcd, the rule is
that:
> * C always implies Zca
> * C+F implies Zcf (RV32 only)
> * C+D implies Zcd



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