tree-ssa-address.c (preferred_mem_scale_factor): Handle when mem_mode is BLKmode.

gcc/ChangeLog:

2019-06-19  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

	* tree-ssa-address.c (preferred_mem_scale_factor): Handle when
	mem_mode is BLKmode.

From-SVN: r272465

gcc/ChangeLog

+2019-06-19  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>
+
+	* tree-ssa-address.c (preferred_mem_scale_factor): Handle when
+	mem_mode is BLKmode.
+
 2019-06-18  Max Filippov  <jcmvbkbc@gmail.com>
 
 	PR target/90922

gcc/tree-ssa-address.c

@@ -1134,6 +1134,10 @@ unsigned int
 preferred_mem_scale_factor (tree base, machine_mode mem_mode,
 			    bool speed)
 {
+  /* For BLKmode, we can't do anything so return 1.  */
+  if (mem_mode == BLKmode)
+    return 1;
+
   struct mem_address parts = {};
   addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (base));
   unsigned int fact = GET_MODE_UNIT_SIZE (mem_mode);