[maleadt]

Three additions that came out of profiling passes written in Julia (JuliaIR.jl):

• copy_metadata!(dest, src, kinds=()) copies the metadata of an instruction with LLVM's
  Instruction::copyMetadata (a new LLVMExtra function). Passes that replace an instruction
  did this through the metadata dictionary, which wraps every attachment and converts it
  through MetadataAsValue. The debug location is handled the way the LLVM version in use
  does: if src has none, LLVM 21 and later keep the one of dest, earlier versions remove
  it (unless src has no metadata at all). Copying the metadata of 5000 loads with !tbaa,
  !range, !noundef and a debug location: 5.4-9.2 ms and 4.7 MiB through the dictionary,
  0.37 ms and no allocations with copy_metadata!.
• f.calls is a read-only view of the call, invoke and callbr instructions of a
  function, as CallBase values. It checks the opcode before wrapping an instruction, so
  passes that only look at calls don't wrap (and dynamically identify) every other
  instruction. Visiting the 1000 calls of a function with 10000 instructions: 0.13-0.23 ms
  when filtering bb.instructions, 0.09 ms with f.calls.
• deps/build_local.jl now builds LLVMExtra as RelWithDebInfo, like the LLVMExtra_jll
  recipe. Without a build type CMake doesn't optimize, so local builds were -O0 and even
  one-line wrappers made out-of-line calls to unwrap. The build type is part of the
  directory the library is installed in, so an existing -O0 build of the same sources isn't
  reused. copy_metadata! on 5000 instructions: 0.53-0.56 ms with -O0, 0.37 ms optimized.

Measured with LLVM 18 on Julia 1.12, on a loaded machine; ranges are over separate processes.

New LLVMExtra function: LLVMExtraCopyMetadata, so this needs a new LLVMExtra_jll build
before release.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #693      +/-   ##
==========================================
+ Coverage   94.82%   94.84%   +0.01%     
==========================================
  Files          58       58              
  Lines        6817     6843      +26     
==========================================
+ Hits         6464     6490      +26     
  Misses        353      353              

Files with missing lines	Coverage Δ
src/core/function.jl	99.58% <100.00%> (+0.04%)	⬆️
src/core/metadata.jl	90.32% <100.00%> (+0.14%)	⬆️

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