[r12-2511 Regression] FAIL: gfortran.dg/PR93963.f90 -Os execution test on Linux/x86_64

[Tobias Burnus]

The automatic regression test of Sunil wrote:

On 26.07.21 19:27, sunil.k.pandey wrote:
> commit 0cbf03689e3e7d9d6002b8e5d159ef3716d0404c
>      PR fortran/93308/93963/94327/94331/97046 problems raised by descriptor handling
> caused
> FAIL: gfortran.dg/PR93963.f90   -O2  execution test
> ...

(That's on x86-64-gnu-linux but (only) with -m32.)

I have filled: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101635

Let's see how soon we can fix this – otherwise, we have to XFAIL this testcase.

I don't completely understand why this only occurred with -m32,
but I believe it is an alias issue. The whole handling of the conversion
(prep code, library call, post-library handling) looks extremely fragile
and this is not the first issue in that this code causes.

I think the proper solution – having tons of advantages - is to move the
library code to the compiler itself and making use of the compile-time
known type, rank, etc. knowledge.

Tobias

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