[all-commits] [llvm/llvm-project] 8836bc: [flang] Add lowering of volatile references (#132486)

[Asher Mancinelli via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8836bce84208737f5807c396345a41e688d3ec11
      https://github.com/llvm/llvm-project/commit/8836bce84208737f5807c396345a41e688d3ec11
  Author: Asher Mancinelli <ashermancinelli at gmail.com>
  Date:   2025-04-30 (Wed, 30 Apr 2025)

  Changed paths:
    M flang/docs/FortranStandardsSupport.md
    M flang/docs/ReleaseNotes.md
    M flang/include/flang/Optimizer/Builder/BoxValue.h
    M flang/include/flang/Optimizer/Builder/Runtime/RTBuilder.h
    M flang/include/flang/Optimizer/Dialect/FIROps.td
    M flang/include/flang/Optimizer/Dialect/FIRType.h
    M flang/include/flang/Optimizer/Dialect/FIRTypes.td
    M flang/lib/Lower/Bridge.cpp
    M flang/lib/Lower/CallInterface.cpp
    M flang/lib/Lower/ConvertCall.cpp
    M flang/lib/Lower/ConvertExpr.cpp
    M flang/lib/Lower/ConvertExprToHLFIR.cpp
    M flang/lib/Lower/HostAssociations.cpp
    M flang/lib/Lower/IO.cpp
    M flang/lib/Optimizer/Builder/Character.cpp
    M flang/lib/Optimizer/Builder/FIRBuilder.cpp
    M flang/lib/Optimizer/Builder/HLFIRTools.cpp
    M flang/lib/Optimizer/CodeGen/CodeGen.cpp
    M flang/lib/Optimizer/Dialect/FIROps.cpp
    M flang/lib/Optimizer/Dialect/FIRType.cpp
    M flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
    M flang/lib/Optimizer/HLFIR/Transforms/ConvertToFIR.cpp
    M flang/test/Fir/cse.fir
    A flang/test/Fir/volatile.fir
    A flang/test/Fir/volatile2.fir
    A flang/test/HLFIR/volatile.fir
    A flang/test/Lower/volatile-openmp.f90
    A flang/test/Lower/volatile-string.f90
    A flang/test/Lower/volatile1.f90
    A flang/test/Lower/volatile2.f90
    A flang/test/Lower/volatile3.f90
    A flang/test/Lower/volatile4.f90

  Log Message:
  -----------
  [flang] Add lowering of volatile references (#132486)

[RFC on
discourse](https://discourse.llvm.org/t/rfc-volatile-representation-in-flang/85404/1)

Flang currently lacks support for volatile variables. For some cases,
the compiler produces TODO error messages and others are ignored. Some
of our tests are like the example from _C.4 Clause 8 notes: The VOLATILE
attribute (8.5.20)_ and require volatile variables.

Prior commits:
```
c9ec1bc753b0 [flang] Handle volatility in lowering and codegen (#135311)
e42f8609858f [flang][nfc] Support volatility in Fir ops (#134858)
b2711e1526f9 [flang][nfc] Support volatile on ref, box, and class types (#134386)
```



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