mmix.md ("nonlocal_goto_receiver"): Refer to the frame-pointer as an operand.

* config/mmix/mmix.md ("nonlocal_goto_receiver"): Refer to the
	frame-pointer as an operand.
	("*nonlocal_goto_receiver_expanded"): Ditto.  Use
	mmix_output_register_setting instead of naked output_asm_insn for
	the offset from the frame-pointer to the saved rO.
	* config/mmix/mmix.c (mmix_output_register_setting): Emit NEGU for
	values -255..0.
	* config/mmix/predicates.md ("frame_pointer_operand"): New.
	* config/mmix/constraints.md ("Yf"): New.

From-SVN: r192677

gcc/ChangeLog

@@ -1,5 +1,15 @@
 2012-10-22  Hans-Peter Nilsson  <hp@bitrange.com>
 
+	* config/mmix/mmix.md ("nonlocal_goto_receiver"): Refer to the
+	frame-pointer as an operand.
+	("*nonlocal_goto_receiver_expanded"): Ditto.  Use
+	mmix_output_register_setting instead of naked output_asm_insn for
+	the offset from the frame-pointer to the saved rO.
+	* config/mmix/mmix.c (mmix_output_register_setting): Emit NEGU for
+	values -255..0.
+	* config/mmix/predicates.md ("frame_pointer_operand"): New.
+	* config/mmix/constraints.md ("Yf"): New.
+
 	* stmt.c (expand_nl_goto_receiver): Remove almost-copy of
 	expand_builtin_setjmp_receiver.
 	(expand_label): Adjust, call expand_builtin_setjmp_receiver

gcc/config/mmix/constraints.md

@@ -110,3 +110,7 @@
 (define_address_constraint "U"
   "@internal"
   (match_operand 0 "mmix_address_operand"))
+
+(define_constraint "Yf"
+  "@internal"
+  (match_operand 0 "frame_pointer_operand"))

gcc/config/mmix/mmix.c

@@ -2299,7 +2299,9 @@ mmix_output_register_setting (FILE *stream,
   if (do_begin_end)
     fprintf (stream, "\t");
 
-  if (mmix_shiftable_wyde_value ((unsigned HOST_WIDEST_INT) value))
+  if (insn_const_int_ok_for_constraint (value, CONSTRAINT_K))
+    fprintf (stream, "NEGU %s,0," HOST_WIDEST_INT_PRINT_DEC, reg_names[regno], -value);
+  else if (mmix_shiftable_wyde_value ((unsigned HOST_WIDEST_INT) value))
     {
       /* First, the one-insn cases.  */
       mmix_output_shiftvalue_op_from_str (stream, "SET",

gcc/config/mmix/mmix.md

@@ -1120,7 +1120,7 @@ DIVU %1,%1,%2\;GET %0,:rR\;NEGU %2,0,%0\;CSNN %0,$255,%2")
 ;; of "pop 0,0" until rO equals the saved value.  (If it goes lower, we
 ;; should die with a trap.)
 (define_expand "nonlocal_goto_receiver"
-  [(parallel [(unspec_volatile [(const_int 0)] 1)
+  [(parallel [(unspec_volatile [(match_dup 1)] 1)
 	      (clobber (scratch:DI))
 	      (clobber (reg:DI MMIX_rJ_REGNUM))])
    (set (reg:DI MMIX_rJ_REGNUM) (match_dup 0))]
@@ -1131,6 +1131,13 @@ DIVU %1,%1,%2\;GET %0,:rR\;NEGU %2,0,%0\;CSNN %0,$255,%2")
     = mmix_get_hard_reg_initial_val (Pmode,
 				     MMIX_INCOMING_RETURN_ADDRESS_REGNUM);
 
+  /* We need the frame-pointer to be live or the equivalent
+     expression, so refer to in in the pattern.  We can't use a MEM
+     (that may contain out-of-range offsets in the final expression)
+     for fear that middle-end will legitimize it or replace the address
+     using temporary registers (which are not revived at this point).  */
+  operands[1] = frame_pointer_rtx;
+
   /* Mark this function as containing a landing-pad.  */
   cfun->machine->has_landing_pad = 1;
 }")
@@ -1140,45 +1147,40 @@ DIVU %1,%1,%2\;GET %0,:rR\;NEGU %2,0,%0\;CSNN %0,$255,%2")
 ;; address and re-use them after the register stack unwind, so it's best
 ;; to form the address ourselves.
 (define_insn "*nonlocal_goto_receiver_expanded"
-  [(unspec_volatile [(const_int 0)] 1)
+  [(unspec_volatile [(match_operand:DI 1 "frame_pointer_operand" "Yf")] 1)
    (clobber (match_scratch:DI 0 "=&r"))
    (clobber (reg:DI MMIX_rJ_REGNUM))]
   ""
 {
-  rtx temp_reg = operands[0];
-  rtx my_operands[2];
-  HOST_WIDEST_INT offs;
+  rtx my_operands[3];
   const char *my_template
     = "GETA $255,0f\;PUT rJ,$255\;LDOU $255,%a0\n\
 0:\;GET %1,rO\;CMPU %1,%1,$255\;BNP %1,1f\;POP 0,0\n1:";
 
-  my_operands[1] = temp_reg;
+  my_operands[1] = operands[0];
+  my_operands[2] = GEN_INT (-MMIX_fp_rO_OFFSET);
 
-  /* If we have a frame-pointer (hence unknown stack-pointer offset),
-     just use the frame-pointer and the known offset.  */
-  if (frame_pointer_needed)
+  if (operands[1] == hard_frame_pointer_rtx)
     {
-      my_operands[0] = GEN_INT (-MMIX_fp_rO_OFFSET);
-
-      output_asm_insn ("NEGU %1,0,%0", my_operands);
-      my_operands[0] = gen_rtx_PLUS (Pmode, frame_pointer_rtx, temp_reg);
+      mmix_output_register_setting (asm_out_file, REGNO (operands[0]),
+				    MMIX_fp_rO_OFFSET, 1);
+      my_operands[0]
+	= gen_rtx_PLUS (Pmode, hard_frame_pointer_rtx, operands[0]);
     }
   else
     {
-      /* We know the fp-based offset, so "eliminate" it to be sp-based.  */
-      offs
-	= (mmix_initial_elimination_offset (MMIX_FRAME_POINTER_REGNUM,
-					    MMIX_STACK_POINTER_REGNUM)
-	   + MMIX_fp_rO_OFFSET);
+      HOST_WIDEST_INT offs = INTVAL (XEXP (operands[1], 1));
+      offs += MMIX_fp_rO_OFFSET;
 
-      if (offs >= 0 && offs <= 255)
+      if (insn_const_int_ok_for_constraint (offs, CONSTRAINT_I))
 	my_operands[0]
 	  = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (offs));
       else
 	{
-	  mmix_output_register_setting (asm_out_file, REGNO (temp_reg),
+	  mmix_output_register_setting (asm_out_file, REGNO (operands[0]),
 					offs, 1);
-	  my_operands[0] = gen_rtx_PLUS (Pmode, stack_pointer_rtx, temp_reg);
+	  my_operands[0]
+	    = gen_rtx_PLUS (Pmode, stack_pointer_rtx, operands[0]);
 	}
     }
 

gcc/config/mmix/predicates.md

@@ -161,3 +161,14 @@
   (if_then_else (match_test "reload_in_progress || reload_completed")
     (match_test "strict_memory_address_p (Pmode, op)")
     (match_test "memory_address_p (Pmode, op)")))
+
+(define_predicate "frame_pointer_operand"
+  (ior
+   (and
+    (match_code "reg")
+    (match_test "op == hard_frame_pointer_rtx || op == frame_pointer_rtx"))
+   (and
+    (match_code "plus")
+    (match_code "reg" "0")
+    (match_code "const_int" "1")
+    (match_test "XEXP (op, 0) == stack_pointer_rtx"))))