Add microblaze_legitimate_pic_operand method

Prevents ICE where insn contains an invalid address

	* config/microblaze/microblaze.c (microblaze_valid_pic_const): New 
	(microblaze_legitimate_pic_operand): Likewise
	* config/microblaze/microblaze.h (LEGITIMATE_PIC_OPERAND_P): calls 
	new function microblaze_legitimate_pic_operand
	* config/microblaze/microblaze-protos.h
	(microblaze_legitimate_pic_operand): Declare.

From-SVN: r196434

gcc/ChangeLog

+2013-03-04  David Holsgrove <david.holsgrove@xilinx.com>
+
+	* config/microblaze/microblaze.c (microblaze_valid_pic_const): New 
+	(microblaze_legitimate_pic_operand): Likewise
+	* config/microblaze/microblaze.h (LEGITIMATE_PIC_OPERAND_P): calls 
+	new function microblaze_legitimate_pic_operand
+	* config/microblaze/microblaze-protos.h
+	(microblaze_legitimate_pic_operand): Declare.
+
 2013-03-04  Edgar E. Iglesias <edgar.iglesias@gmail.com>
 
 	*  config/microblaze/predicates.md (call_insn_simple_operand):

gcc/config/microblaze/microblaze-protos.h

@@ -49,6 +49,7 @@ extern HOST_WIDE_INT microblaze_initial_elimination_offset (int, int);
 extern void microblaze_declare_object (FILE *, const char *, const char *,
    const char *, int);
 extern void microblaze_asm_output_ident (const char *);
+extern int microblaze_legitimate_pic_operand (rtx);
 #endif  /* RTX_CODE */
 
 /* Declare functions in microblaze-c.c.  */

gcc/config/microblaze/microblaze.c

@@ -596,6 +596,32 @@ microblaze_legitimate_address_p (enum machine_mode mode, rtx x, bool strict)
   return microblaze_classify_address (&addr, x, mode, strict);
 }
 
+int
+microblaze_valid_pic_const (rtx x)
+{
+  switch (GET_CODE (x))
+    {
+    case CONST:
+    case CONST_INT:
+    case CONST_DOUBLE:
+      return true;
+    default:
+      return false;
+    }
+}
+
+int
+microblaze_legitimate_pic_operand (rtx x)
+{
+  struct microblaze_address_info addr;
+
+  if (pic_address_needs_scratch (x))
+    return 0;
+  if (!microblaze_valid_pic_const(x))
+    return 0;
+
+  return 1;
+}
 
 /* Try machine-dependent ways of modifying an illegitimate address
    to be legitimate.  If we find one, return the new, valid address.

gcc/config/microblaze/microblaze.h

@@ -541,7 +541,7 @@ typedef struct microblaze_args
 
 /* Define this, so that when PIC, reload won't try to reload invalid
    addresses which require two reload registers.  */
-#define LEGITIMATE_PIC_OPERAND_P(X)  (!pic_address_needs_scratch (X))
+#define LEGITIMATE_PIC_OPERAND_P(X)  microblaze_legitimate_pic_operand (X)
 
 #define CASE_VECTOR_MODE			(SImode)