re PR middle-end/65182 (-Wuninitialized fails when pointer to variable later…

re PR middle-end/65182 (-Wuninitialized fails when pointer to variable later passed to function (fixed? add testcase?))

	PR target/65182
	* config/rs6000/rs6000.c (get_memref_parts): Only return true
	when *base is a reg.  Handle nested plus addresses.  Simplify
	pre_modify test.

From-SVN: r220924

gcc/ChangeLog

+2015-02-24  Alan Modra  <amodra@gmail.com>
+
+	PR target/65182
+	* config/rs6000/rs6000.c (get_memref_parts): Only return true
+	when *base is a reg.  Handle nested plus addresses.  Simplify
+	pre_modify test.
+
 2015-02-22  Max Filippov  <jcmvbkbc@gmail.com>
 
 	* config/xtensa/xtensa.h (CONSTANT_ALIGNMENT, DATA_ALIGNMENT):

gcc/config/rs6000/rs6000.c

@@ -27172,25 +27172,21 @@ get_memref_parts (rtx mem, rtx *base, HOST_WIDE_INT *offset,
   else
     return false;
 
-  if (GET_CODE (XEXP (mem, 0)) == PRE_MODIFY)
-    addr_rtx = XEXP (XEXP (mem, 0), 1);
-  else
-    addr_rtx = (XEXP (mem, 0));
+  addr_rtx = (XEXP (mem, 0));
+  if (GET_CODE (addr_rtx) == PRE_MODIFY)
+    addr_rtx = XEXP (addr_rtx, 1);
 
-  if (GET_CODE (addr_rtx) == REG)
-    {
-      *base = addr_rtx;
-      *offset = 0;
-    }
-  else if (GET_CODE (addr_rtx) == PLUS
-	   && CONST_INT_P (XEXP (addr_rtx, 1)))
+  *offset = 0;
+  while (GET_CODE (addr_rtx) == PLUS
+	 && CONST_INT_P (XEXP (addr_rtx, 1)))
     {
-      *base = XEXP (addr_rtx, 0);
-      *offset = INTVAL (XEXP (addr_rtx, 1));
+      *offset += INTVAL (XEXP (addr_rtx, 1));
+      addr_rtx = XEXP (addr_rtx, 0);
     }
-  else
+  if (!REG_P (addr_rtx))
     return false;
 
+  *base = addr_rtx;
   return true;
 }