2008-04-02 Richard Guenther <rguenther@suse.de>
* tree-vrp.c (extract_range_from_assert): Make sure to not
produce range min/max with TREE_OVERFOW set.
If merging a anti-range and a range keep the anti-range if
the range covers all values of the type.
(register_edge_assert_for_2): Only allow sign-changing
conversions in detecting canonical range checks. Also
register an assert for the unsigned name if useful.
PR tree-optimization/35787
* tree-vrp.c (vrp_val_max): New function.
(vrp_val_min): Likewise.
(vrp_val_is_max): Move earlier, use vrp_val_{min,max}.
(vrp_val_is_min): Likewise.
(supports_overflow_infinity): Use vrp_val_{min,max}.
(negative_overflow_infinity): Likewise.
(positive_overflow_infinity): Likewise.
(is_negative_overflow_infinity): Use vrp_val_is_{min,max}.
(is_positive_overflow_infinity): Likewise.
(is_overflow_infinity): Likewise.
(avoid_overflow_infinity): Use vrp_val_{min,max} and
vrp_val_is_{min,max}.
(set_and_canonicalize_value_range): Canonicalize anti-ranges
to ranges if possible. Avoid empty ranges.
* gcc.dg/tree-ssa/vrp38.c: New testcase.
* gcc.dg/tree-ssa/vrp39.c: Likewise.
From-SVN: r133808
