re PR target/57491 ([ia64] internal compiler error: in ia64_split_tmode -O2, quadmath)

        PR target/57491
        * config/ia64/ia64.c (ia64_split_tmode_move): Relax `dead'
        flag setting.

From-SVN: r204777

gcc/ChangeLog

+2013-11-14  Kirill Yukhin  <kirill.yukhin@intel.com>
+
+	PR target/57491
+	* config/ia64/ia64.c (ia64_split_tmode_move): Relax `dead'
+	flag setting.
+
 2013-11-14  Jakub Jelinek  <jakub@redhat.com>
 	    Uros Bizjak  <ubizjak@gmail.com>
 

gcc/config/ia64/ia64.c

@@ -1529,12 +1529,19 @@ ia64_split_tmode_move (rtx operands[])
       && reg_overlap_mentioned_p (operands[0], operands[1]))
     {
       rtx base = XEXP (operands[1], 0);
+      rtx first_write = gen_rtx_REG (DImode, REGNO (operands[0]));
       while (GET_CODE (base) != REG)
 	base = XEXP (base, 0);
 
       if (REGNO (base) == REGNO (operands[0]))
-	reversed = true;
-      dead = true;
+	{
+	  reversed = true;
+	  first_write = gen_rtx_REG (DImode, REGNO (operands[0]) + 1);
+	}
+
+      if (GET_CODE (operands[0]) == REG
+	  && reg_overlap_mentioned_p (first_write, operands[1]))
+	dead = true;
     }
   /* Another reason to do the moves in reversed order is if the first
      element of the target register pair is also the second element of