Slava Zakharin 2384e84bbb [flang] Restore stack after allocas created by TargetRewrite. ...

This resolves issues with running out of stack on examples like
https://fortran-lang.discourse.group/t/modern-fortran-sample-code/2019/18
reported by @clementval.

When target rewrite creates alloca(s) around a call, we need to insert
stacksave/stackrestore to free the allocated stack. Better performant
code may be achieved by placing the alloca(s) outside of loops,
but the placement has to behave correctly with regards to OpenMP/OpenACC/etc.
dialect operations that have special representation for "private"
objects. This is a concervative fix for correctness issue.

Differential Revision: https://reviews.llvm.org/D149222

2023-04-26 10:33:00 -07:00

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