[Bug c/32500] New: Loop optimization limits range to size of array used inside loop

["ed at fxq dot nl" <gcc-bugzilla at gcc dot gnu dot org>]

Hello,

On the FreeBSD -CURRENT mailing lists a user of the upcoming FreeBSD release
discovered a bug in the GCC that is shipped with the base system (4.2.0
20070514). This bug causes the amount of iterations in a loop to be limited to
the range of an array used in a single part of the loop. When the size of the
loop is increased (in the attached example, to 6 or higher) the problem
disappears.

The issue is solved when compiling the application with -O1 or lower.


-- 
           Summary: Loop optimization limits range to size of array used
                    inside loop
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ed at fxq dot nl
 GCC build triplet: amd64-undermydesk-freebsd
  GCC host triplet: amd64-undermydesk-freebsd
GCC target triplet: amd64-undermydesk-freebsd


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32500