Revert:

	2016-01-21  Ajit Agarwal  <ajitkum@xilinx.com>

	See https://gcc.gnu.org/ml/gcc/2017-05/msg00221.html.

	* config/microblaze/microblaze.h
	(FIXED_REGISTERS): Update in macro.
	(CALL_USED_REGISTERS): Update in macro.

From-SVN: r248540

gcc/ChangeLog

+2017-05-27  Michael Eager  <eager@eagercon.com>
+
+	Revert:
+	2016-01-21  Ajit Agarwal  <ajitkum@xilinx.com>
+
+	See https://gcc.gnu.org/ml/gcc/2017-05/msg00221.html.
+
+	* config/microblaze/microblaze.h
+	(FIXED_REGISTERS): Update in macro.
+	(CALL_USED_REGISTERS): Update in macro.
+
 2017-05-27  François-Xavier Coudett  <fxcoudert@gcc.gnu.org>
 
 	* doc/install.texi: Add links to macOS binary distributions.

gcc/config/microblaze/microblaze.h

@@ -269,14 +269,14 @@ extern enum pipeline_type microblaze_pipe;
 #define FIXED_REGISTERS							\
 {									\
   1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,			\
-  1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
+  1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
   1, 1, 1, 1 								\
 }
 
 #define CALL_USED_REGISTERS						\
 {									\
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,			\
-  1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
+  1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
   1, 1, 1, 1								\
 }
 #define GP_REG_FIRST    0