regrename.c (regrename_optimize): Don't accept a part-clobbered register if the repla...

* regrename.c (regrename_optimize): Don't accept a
part-clobbered register if the replaced register is not part
clobbered.

From-SVN: r49676

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 748d7a7..46d6899 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2002-02-11  Alexandre Oliva  <aoliva@redhat.com>
 
+       * regrename.c (regrename_optimize): Don't accept a
+       part-clobbered register if the replaced register is not part
+       clobbered.
+
        * calls.c (store_one_arg): In the non-BLKmode non-partial case,
        take padding into account when computing the argument value.
 

diff --git a/gcc/regrename.c b/gcc/regrename.c
index b830b88..135eaef 100644 (file)
--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -325,7 +325,12 @@ regrename_optimize ()
              /* See whether it accepts all modes that occur in
                 definition and uses.  */
              for (tmp = this; tmp; tmp = tmp->next_use)
-               if (! HARD_REGNO_MODE_OK (new_reg, GET_MODE (*tmp->loc)))
+               if (! HARD_REGNO_MODE_OK (new_reg, GET_MODE (*tmp->loc))
+                   || (tmp->need_caller_save_reg
+                       && ! (HARD_REGNO_CALL_PART_CLOBBERED
+                             (reg, GET_MODE (*tmp->loc)))
+                       && (HARD_REGNO_CALL_PART_CLOBBERED
+                           (new_reg, GET_MODE (*tmp->loc)))))
                  break;
              if (! tmp)
                {