Il 21/05/2012 17:54, Andrew Jenner ha scritto: > This patch is a followup to the patch Sandra Loosemore made to fix > PR50380 (see (http://gcc.gnu.org/ml/gcc-patches/2011-12/msg01402.html). > That patch only detects fixed points, but Joseph Myers found a testcase > which creates a cycle of length 2, causing find_comparison_args to stall > even with the earlier patch. > > This patch uses a pointer_set to detect cycles of any length and adds > the new testcase to the test. I have successfully run bootstrap and > regression tests. Okay to commit to mainline?
That's pretty heavy-weight. Perhaps you can try the usual algorithm of looking at x->next and x->next->next? Paolo
