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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98458] PRINT the array constructed from implied do-loop
 throw ICE
Date: Wed, 30 Dec 2020 02:19:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98458

--- Comment #6 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Wed, Dec 30, 2020 at 12:52:03AM +0000, xiao.liu@compiler-dev.com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98458
>=20
> --- Comment #5 from xiao.liu@compiler-dev.com <xiao.liu@compiler-dev.com>=
 ---
> (In reply to Paul Thomas from comment #4)
> > Created attachment 49856 [details]
> > Fix for the PR
> >=20
> > Thank you for the report on this problem.
> >=20
> > The attached patch fixes the problem and regression tests OK. I need to=
 do a
> > bit more thinking about it because I was unable to find a point in gene=
ral
> > expression simplification where the fix could be applied. Instead, it o=
nly
> > seems to work in the simplification of intrinsic functions. Fortunately,
> > this seems to be the only place where it is needed.
> >=20
> > Paul
>=20
> As a beginner of FORTRAN, I am not sure about the result of implied do-lo=
op
> which contains array section, so add "print" to check. Thanks for your
> attention on this problem.
>=20

PRINT has nothing to do with the problem.  I simply
have no interest in fixing the changed and now misleading
subject line.  I've been asked to stop.

My proposed patch fixes the issue in one spot.  Paul's
patch fixes potentially many spots.  Unfortunately, the
handling of implied do-loops is done in an ad hoc fashion,
and is complicated by the potential problem of exhausting
the stack.=