[Bug tree-optimization/24309] [4.1 Regression] ICE with -O3 -ftree-loop-linear

["janis at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #9 from janis at gcc dot gnu dot org  2005-11-14 17:39 -------
A regression hunt on powerpc-linux shows that the testcase from comment #8
starts failing with this large merge from the autovect branch, within the
date range that the submitter identified:

http://gcc.gnu.org/viewcvs?view=rev&rev=102356

r102356 | irar | 2005-07-25 12:05:07 +0000 (Mon, 25 Jul 2005) | 83 lines

A regression hunt on powerpc-linux using the testcase from comment #2
identified this patch; the original larger testcase fails at the same place:

http://gcc.gnu.org/viewcvs?view=rev&rev=88404

r88404 | rakdver | 2004-10-01 18:26:37 +0000 (Fri, 01 Oct 2004) | 9 lines

        * common.opt (ftree-loop-ivcanon): Enable by default.
        * tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
        Enable complete loop unrolling.
        (canonicalize_induction_variables, tree_unroll_loops_completely):
        Reset scev info.

        * gcc.dg/tree-ssa/loop-1.c: Check that unrolling occurs already on
        tree level.

The reghunts used "-O2 -ftree-loop-linear".  Let me know if there are other
options that could be used to find earlier failures.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24309