re PR target/26018 (Assembler errors with -march=z900 compiling glibc)

	PR target/26018
	* config/s390/s390.c (struct machine_function): New flag
	decomposed_literal_pool_addresses_ok_p.
	(s390_reorg): Set it before final stage of literal pool transforms.
	(s390_decompose_address): Only accept displacements of the form
	(minus (label_ref ...) (label_ref ...)) if that flag is set.

From-SVN: r110422

gcc/ChangeLog

+2006-01-30  Ulrich Weigand  <uweigand@de.ibm.com>
+
+	PR target/26018
+	* config/s390/s390.c (struct machine_function): New flag
+	decomposed_literal_pool_addresses_ok_p.
+	(s390_reorg): Set it before final stage of literal pool transforms.
+	(s390_decompose_address): Only accept displacements of the form
+	(minus (label_ref ...) (label_ref ...)) if that flag is set.
+
 2006-01-30  Carlos O'Donell  <carlos@codesourcery.com>
 
 	* optabs.c (prepare_cmp_insn): If unbaised and unsigned then bias

gcc/config/s390/s390.c

@@ -279,6 +279,9 @@ struct machine_function GTY(())
   /* True if we may need to perform branch splitting.  */
   bool split_branches_pending_p;
 
+  /* True during final stage of literal pool processing.  */
+  bool decomposed_literal_pool_addresses_ok_p;
+
   /* Some local-dynamic TLS symbol name.  */
   const char *some_ld_name;
 
@@ -1705,7 +1708,9 @@ s390_decompose_address (rtx addr, struct s390_address *out)
         }
 
       /* Accept chunkified literal pool symbol references.  */
-      else if (GET_CODE (disp) == MINUS
+      else if (cfun && cfun->machine
+	       && cfun->machine->decomposed_literal_pool_addresses_ok_p
+	       && GET_CODE (disp) == MINUS
                && GET_CODE (XEXP (disp, 0)) == LABEL_REF
                && GET_CODE (XEXP (disp, 1)) == LABEL_REF)
         {
@@ -8934,6 +8939,8 @@ s390_reorg (void)
      machine_dependent_reorg might confuse insn length counts.  */
   split_all_insns_noflow ();
 
+  /* From here on decomposed literal pool addresses must be accepted.  */
+  cfun->machine->decomposed_literal_pool_addresses_ok_p = true;
 
   /* Install the main literal pool and the associated base
      register load insns.