[qt/clang/llvm]: Summary of bulk changes made

Git repository change summary for qt/clang/llvm
Pushed by mirror-service into branch 'upstream/users/vchuravy/hlfir-pipeline-extension-points'.
Changed from 0000000000000000000000000000000000000000 to 47fffa41d619850f2770c56037e0ae2af235375c
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit 47fffa41d619850f2770c56037e0ae2af235375c by Valentin Churavy on 27/07/2026 at 08:19..
[flang] Add HLFIR-to-FIR pass pipeline extension points

The FIR optimizer extension points (FIROptEarly, FIRInliner, FIROptLast) all
run after HLFIR has been lowered to FIR, so the HLFIR intrinsic operations
(hlfir.sum, hlfir.matmul, ...) are gone by the time they run. Transformations
that need to see those operations -- for example automatic differentiation via
Enzyme-MLIR -- have nowhere to attach.

Add two extension points to createHLFIRToFIRPassPipeline:

  * HLFIROptEarly, at the start of the pipeline, before any HLFIR
    simplification or inlining.
  * HLFIROptLast, just before createLowerHLFIRIntrinsics.

Drivers register passes through registerHLFIROptEarlyEPCallbacks and
registerHLFIROptLastEPCallbacks on MLIRToLLVMPassPipelineConfig. The invoke
methods are const so they can be called on the const config the HLFIR pipeline
receives. With no callbacks registered the pipeline is unchanged.

The tests assert on printAsTextualPipeline output rather than just on the
callbacks firing, so that a reordering of the pipeline breaks them, and cover
every optimization level.

Co-Authored-By: Claude Opus 5 <[email protected]>
https://invent.kde.org/qt/clang/llvm/-/commit/47fffa41d619850f2770c56037e0ae2af235375c