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[Bug tree-optimization/61000] No loop interchange for inner loop along the slow index
- From: "mircea.namolaru at inria dot fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 30 Apr 2014 10:51:28 +0000
- Subject: [Bug tree-optimization/61000] No loop interchange for inner loop along the slow index
- Auto-submitted: auto-generated
- References: <bug-61000-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61000
--- Comment #2 from Mircea Namolaru <mircea.namolaru at inria dot fr> ---
Again, the problem is due to representation of arrays in Fortran as array with
a single dimnesion (for similar code in C profitability check work as
expected). It is a recurring problem that may lead to compilation time increase
(sometimes dramatically) or missed opportunities optimizations due to too
conservative dependence analysis or as on this case the profitability check
failure. The solution is to de-liniarize array accesses in Fortran as in C.