[flang-commits] [PATCH] D115470: [flang] Fix folding of ac-implied-do indices in structure c'tors

[Peter Klausler via Phabricator via flang-commits]

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Array constructors with implied DO loops that oversee structure
constructors were being prematurely folded into invalid constants
containing symbolic references to the ac-implied-do indices,
because they are indeed "constant expressions" as that term is
used in the Fortran standard and implemented as IsConstantExpr().
What's actually needed in structure constructor folding is a
test for actual constant values, which is what results from
folding them later with repetition in the context of folding
an ac-implied-do.


https://reviews.llvm.org/D115470

Files:
  flang/lib/Evaluate/fold-implementation.h
  flang/lib/Evaluate/fold.cpp
  flang/test/Evaluate/folding30.f90

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