From: Alexandre Oliva <aoliva@redhat.com>
Date: Mon, 11 Feb 2002 13:35:14 +0000 (+0000)
Subject: regrename.c (regrename_optimize): Don't accept a part-clobbered register if the repla... 
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=66df7a985f423ee12a75bd1ae0852ad942b925c3;p=platform%2Fupstream%2Fgcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 748d7a7..46d6899 100644
--- 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
--- 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)
 		{