{
gcc_checking_assert (gimple_range_ssa_p (name));
tree type = TREE_TYPE (name);
-#if 0
- // Reenable picking up global ranges when we are OK failing tests that look
- // for builtin_unreachable in the code, like
- // RUNTESTFLAGS=dg.exp=pr61034.C check-g++
- // pre-optimizations (inlining) set a global range which causes the ranger
- // to remove the condition which leads to builtin_unreachable.
- if (!POINTER_TYPE_P (type) && SSA_NAME_RANGE_INFO (name))
+
+ if (SSA_NAME_IS_DEFAULT_DEF (name))
{
- // Return a range from an SSA_NAME's available range.
- wide_int min, max;
- enum value_range_kind kind = get_range_info (name, &min, &max);
- return value_range (type, min, max, kind);
- }
-#endif
- // Otherwise return range for the type.
- return value_range (type);
+ tree sym = SSA_NAME_VAR (name);
+ // Adapted from vr_values::get_lattice_entry().
+ // Use a range from an SSA_NAME's available range.
+ if (TREE_CODE (sym) == PARM_DECL)
+ {
+ // Try to use the "nonnull" attribute to create ~[0, 0]
+ // anti-ranges for pointers. Note that this is only valid with
+ // default definitions of PARM_DECLs.
+ if (POINTER_TYPE_P (type)
+ && (nonnull_arg_p (sym) || get_ptr_nonnull (name)))
+ {
+ value_range r;
+ r.set_nonzero (type);
+ return r;
+ }
+ else if (INTEGRAL_TYPE_P (type))
+ {
+ value_range r;
+ get_range_info (name, r);
+ if (r.undefined_p ())
+ r.set_varying (type);
+ return r;
+ }
+ }
+ // If this is a local automatic with no definition, use undefined.
+ else if (TREE_CODE (sym) != RESULT_DECL)
+ return value_range ();
+ }
+ // Otherwise return range for the type.
+ return value_range (type);
}