[Bug middle-end/40979] induct benchmark 60% slower when compiled with -fgraphite-identity

["howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40979

--- Comment #10 from Jack Howarth <howarth at nitro dot med.uc.edu> 2011-01-26 14:20:18 UTC ---
(In reply to comment #9)
> This pr is not fixed at revision 169261 (gfc). AFAIU -ftree-loop-linear is now
> implemented through graphite. This leads to a sort of regression with respect
> to revision 169227(gfc6):
> 
> [macbook] lin/test% gfc -Ofast -ftree-loop-linear induct.f90
> [macbook] lin/test% time a.out > /dev/null
> 22.380u 0.023s 0:22.40 100.0%    0+0k 0+0io 0pf+0w
> [macbook] lin/test% gfc6 -Ofast -ftree-loop-linear induct.f90
> [macbook] lin/test% time a.out > /dev/null
> 13.978u 0.019s 0:13.99 99.9%    0+0k 0+0io 0pf+0w

Note that -fgraphite-identity still triggers a large number of failures in the
vect.exp testsuite when defaulted on at -O2...

http://gcc.gnu.org/ml/gcc-testresults/2011-01/msg02005.html

so the regression in induct.f90 isn't unique.