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

regrename.c (regrename_optimize): Don't accept a part-clobbered register if the replaced register is not part... * regrename.c (regrename_optimize): Don't accept a part-clobbered register if the replaced register is not part clobbered. From-SVN: r49676

regrename.c (regrename_optimize): Don't accept a part-clobbered register if the…
regrename.c (regrename_optimize): Don't accept a part-clobbered register if the replaced register is not part... * regrename.c (regrename_optimize): Don't accept a part-clobbered register if the replaced register is not part clobbered. From-SVN: r49676
66df7a98 · Alexandre Oliva · Alexandre Oliva · 841404cd · 66df7a98 · 66df7a98
Commit 66df7a98 authored Feb 11, 2002 by Alexandre Oliva Committed by Alexandre Oliva Feb 11, 2002
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gcc/ChangeLog
+4 -0

gcc/regrename.c
+6 -1

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
 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.


--- 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)
 		{