rx.opt (-mjsr): Add.

* config/rx/rx.opt (-mjsr): Add.
* config/rx/predicates.md (rx_call_operand): Avoid overflowing
calls when -mjsr.
* config/rx/rx.c (rx_function_ok_for_sibcall): Likewise for
overflowing jumps.
* doc/invoke.texi (-mjsr): Document it.

From-SVN: r231439

gcc/ChangeLog

+2015-12-08  DJ Delorie  <dj@redhat.com>
+
+	* config/rx/rx.opt (-mjsr): Add.
+	* config/rx/predicates.md (rx_call_operand): Avoid overflowing
+	calls when -mjsr.
+	* config/rx/rx.c (rx_function_ok_for_sibcall): Likewise for
+	overflowing jumps.
+	* doc/invoke.texi (-mjsr): Document it.
+
 2015-12-08  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR ipa/61886

gcc/config/rx/predicates.md

@@ -24,7 +24,9 @@
 ;; Only registers and symbol refs are allowed.
 
 (define_predicate "rx_call_operand"
-  (match_code "symbol_ref,reg")
+  (ior (match_code "reg")
+       (and (match_test "!TARGET_JSR")
+	    (match_code "symbol_ref")))
 )
 
 ;; For sibcall operations we can only use a symbolic address.

gcc/config/rx/rx.c

@@ -2857,6 +2857,9 @@ rx_warn_func_return (tree decl)
 static bool
 rx_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
 {
+  if (TARGET_JSR)
+    return false;
+
   /* Do not allow indirect tailcalls.  The
      sibcall patterns do not support them.  */
   if (decl == NULL)

gcc/config/rx/rx.opt

@@ -149,3 +149,9 @@ Enable the use of the LRA register allocator.
 mallow-string-insns
 Target Report Var(rx_allow_string_insns) Init(1)
 Enables or disables the use of the SMOVF, SMOVB, SMOVU, SUNTIL, SWHILE and RMPA instructions.  Enabled by default.
+
+;---------------------------------------------------
+
+mjsr
+Target Report Mask(JSR)
+Always use JSR, never BSR, for calls.

gcc/doc/invoke.texi

@@ -968,6 +968,7 @@ See RS/6000 and PowerPC Options.
 -mint-register=@gol
 -mpid@gol
 -mallow-string-insns -mno-allow-string-insns@gol
+-mjsr@gol
 -mno-warn-multiple-fast-interrupts@gol
 -msave-acc-in-interrupts}
 
@@ -20685,6 +20686,15 @@ accesses I/O space.
 When the instructions are enabled GCC defines the C preprocessor
 symbol @code{__RX_ALLOW_STRING_INSNS__}, otherwise it defines the
 symbol @code{__RX_DISALLOW_STRING_INSNS__}.
+
+@item -mjsr
+@itemx -mno-jsr
+@opindex mjsr
+@opindex mno-jsr
+Use only (or not only) @code{JSR} instructions to access functions.
+This option can be used when code size exceeds the range of @code{BSR}
+instructions.  Note that @option{-mno-jsr} does not mean to not use
+@code{JSR} but instead means that any type of branch may be used.
 @end table
 
 @emph{Note:} The generic GCC command-line option @option{-ffixed-@var{reg}}