[flang-commits] [PATCH] D124167: [flang] Fold transformational bessels when host runtime has bessels

[Jean Perier via Phabricator via flang-commits]

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Transformational bessel intrinsic functions require the same math runtime
as elemental bessel intrinsics.

Currently elemental bessels could be folded if f18 was linked with pgmath
(cmake -DLIBPGMATH_DIR option). `j0`, `y0`, ... C libm functions were not
used because they are not standard C functions: they are Posix
extensions.

This patch enable:

- Using the Posix bessel host runtime functions when available.
- folding the transformational bessel using the elemental version.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D124167

Files:
  flang/lib/Evaluate/fold-real.cpp
  flang/lib/Evaluate/intrinsics-library.cpp
  flang/test/Evaluate/folding02.f90

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