------- Comment #8 from ian at airs dot com 2006-05-15 05:41 -------
Steven: what's your patch? It seems to me that this fixes the problem in
mainline:
Index: tree-ssa-loop-niter.c
===================================================================
--- tree-ssa-loop-niter.c (revision 113773)
+++ tree-ssa-loop-niter.c (working copy)
@@ -1612,7 +1612,7 @@ infer_loop_bounds_from_undefined (struct
diff = fold_build2 (MINUS_EXPR, utype,
TYPE_MAX_VALUE (type), init);
- if (!integer_zerop (step))
+ if (!integer_zerop (step) && !TREE_OVERFLOW (diff))
{
estimation = fold_build2 (CEIL_DIV_EXPR, utype, diff,
step);
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27603
