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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/102043] [9/10/11/12 Regression] Wrong array types used
 for negative stride accesses, gfortran.dg/vector_subscript_1.f90  FAILs
Date: Thu, 24 Mar 2022 09:39:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102043

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.5
            Summary|Wrong array types used for  |[9/10/11/12 Regression]
                   |negative stride accesses    |Wrong array types used for
                   |                            |negative stride accesses,
                   |                            |gfortran.dg/vector_subscrip
                   |                            |t_1.f90  FAILs

--- Comment #33 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, for GCC 12 this issue is now visible through IPA modref and results in

FAIL: gfortran.dg/vector_subscript_1.f90   -O1  execution test
FAIL: gfortran.dg/vector_subscript_1.f90   -O2  execution test
FAIL: gfortran.dg/vector_subscript_1.f90   -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/vector_subscript_1.f90   -O3 -g  execution test
FAIL: gfortran.dg/vector_subscript_1.f90   -Os  execution test

on at least x86_64-unknown-linux-gnu.

The testcase in comment#1 still shows the issue is older.  Since gfortran 4=
.3
works this is still a regression (I guess it became appearant with the alias
oracle introduction).

I'll note the OpenACC folks were working on making gfortran preserve
multi-dimensional array accesses, not sure how they address this issue.  Wi=
th
a single dimension there's not much value in using ARRAY_REF over
pointer arithmetic and dereference.=