* var-tracking.c (reverse_op): Don't add any reverse operation
if V already has any constant locations.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@183608
138bc75d-0d04-0410-961f-
82ee72b054a4
+2012-01-27 Jakub Jelinek <jakub@redhat.com>
+
+ PR debug/52001
+ * var-tracking.c (reverse_op): Don't add any reverse operation
+ if V already has any constant locations.
+
2012-01-27 Sandra Loosemore <sandra@codesourcery.com>
* doc/invoke.texi: Correct usage of "command line" (noun)
{
rtx src, arg, ret;
cselib_val *v;
+ struct elt_loc_list *l;
enum rtx_code code;
if (GET_CODE (expr) != SET)
if (!v || !cselib_preserved_value_p (v))
return;
+ /* Adding a reverse op isn't useful if V already has an always valid
+ location. Ignore ENTRY_VALUE, while it is always constant, we should
+ prefer non-ENTRY_VALUE locations whenever possible. */
+ for (l = v->locs; l; l = l->next)
+ if (CONSTANT_P (l->loc)
+ && (GET_CODE (l->loc) != CONST || !references_value_p (l->loc, 0)))
+ return;
+
switch (GET_CODE (src))
{
case NOT: