https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107373
Bug ID: 107373
Summary: Unexpected result with loop optimisation
Product: gcc
Version: 8.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: raphael.monod at wanadoo dot fr
Target Milestone: ---
Created attachment 53765
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53765&action=edit
Source of test producing the bug (MWE)
The attached test show the vector "tab_int_from_logical" contains -1, although
+1 are expected.
Compiler option -O3 is required to get this bug.
Adding a print in the loop go around it.
Degreasing the dimension 'IDIM' from 16 to 15 go around it.
I do not have test all GCC releases, but I met this bug with release : 7.3.0,
8.2.0, 8.5.0, 9.4.0.
Everything is good with releases 6.3.0, 11.3.0, 12.1.0
I known that releases used to produce this bug are no longer supported, bug I
think that debian 10 (which is again supported) use 8.x GCC release.
