* cse.c (cse_insn): Avoid invalid sharing on trial replacement.

From-SVN: r126481

gcc/ChangeLog

+2007-07-09  Jan HUbicka  <jh@suse.cz>
+
+	* cse.c (cse_insn): Avoid invalid sharing on trial replacement.
+
 2007-07-09  Richard Guenther  <rguenther@suse.de>
 
 	* c-decl.c (start_function): Do not promote return type.

gcc/cse.c

@@ -4830,7 +4830,8 @@ cse_insn (rtx insn, rtx libcall_insn)
 	    ;
 
 	  /* Look for a substitution that makes a valid insn.  */
-	  else if (validate_change (insn, &SET_SRC (sets[i].rtl), trial, 0))
+	  else if (validate_unshare_change
+		     (insn, &SET_SRC (sets[i].rtl), trial, 0))
 	    {
 	      rtx new = canon_reg (SET_SRC (sets[i].rtl), insn);