[all-commits] [llvm/llvm-project] 926164: [flang][codegen] Report a shape or slice cg-rewrit...

[Kareem Ergawy via All-commits]

  Branch: refs/heads/users/ergawy/fir-report-unfoldable-shape-slice
  Home:   https://github.com/llvm/llvm-project
  Commit: 926164538762be44d04ccd23b89c2dd523378eb8
      https://github.com/llvm/llvm-project/commit/926164538762be44d04ccd23b89c2dd523378eb8
  Author: ergawy <kareem.ergawy at gmail.com>
  Date:   2026-09-30 (Wed, 30 Sep 2026)

  Changed paths:
    M flang/lib/Optimizer/CodeGen/PreCGRewrite.cpp
    A flang/test/Fir/cg-rewrite-unfoldable-slice.fir

  Log Message:
  -----------
  [flang][codegen] Report a shape or slice cg-rewrite cannot read

cg-rewrite folds a fir.shape, fir.shape_shift, fir.shift or fir.slice
into the code-gen form by reading it through its defining op. A value
that has none cannot be folded. For a slice this went unreported: the
rewrite dropped it and produced a descriptor for the whole array rather
than the section it names. For a shape it reached a cast on a null
defining op.

Report it instead, and say which operand. Rebuilding the value covers a
block argument, but not every case: a slice chosen by an arith.select
has no single value to take apart.



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