[all-commits] [llvm/llvm-project] d1e28e: [RISCV] Support __builtin_cpu_init and __builtin_c...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d1e28e2a7bd4642e6a5ec963a5ca2ad2ba1b2b59
      https://github.com/llvm/llvm-project/commit/d1e28e2a7bd4642e6a5ec963a5ca2ad2ba1b2b59
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-07-23 (Tue, 23 Jul 2024)

  Changed paths:
    M clang/lib/Basic/Targets/RISCV.cpp
    M clang/lib/Basic/Targets/RISCV.h
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/CodeGen/CodeGenFunction.h
    M clang/test/CodeGen/builtin-cpu-supports.c
    M clang/test/Preprocessor/has_builtin_cpuid.c
    M clang/test/Sema/builtin-cpu-supports.c
    M llvm/include/llvm/TargetParser/RISCVISAInfo.h
    M llvm/lib/TargetParser/RISCVISAInfo.cpp

  Log Message:
  -----------
  [RISCV] Support __builtin_cpu_init and __builtin_cpu_supports (#99700)

This implements the __builtin_cpu_init and __builtin_cpu_supports
builtin routines based on the compiler runtime changes in
https://github.com/llvm/llvm-project/pull/85790.

This is inspired by https://github.com/llvm/llvm-project/pull/85786.
Major changes are a) a restriction in scope to only the builtins (which
have a much narrower user interface), and the avoidance of false
generality. This change deliberately only handles group 0 extensions
(which happen to be all defined ones today), and avoids the tblgen
changes from that review.

I don't have an environment in which I can actually test this, but @BeMg
has been kind enough to report that this appears to work as expected.

Before this can make it into a release, we need a change such as
https://github.com/llvm/llvm-project/pull/99958. The gcc docs claim that
cpu_support can be called by "normal" code without calling the cpu_init
routine because the init routine will have been called by a high
priority constructor. Our current compiler-rt mechanism does not do
this.



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