re PR bootstrap/4192 (fr30-elf does not build - memory exhausted building crtbegin.o)

	PR bootstrap/4192
	* config/fr30/fr30.md (jump): Comment out clobber of fixed register.

	* genemit.c (output_added_clobbers_hard_reg_p): Only output return
	stmt if some case has been output.

	* gcc.c-torture/compile/20020320-1.c: New test.

From-SVN: r51088

gcc/ChangeLog

 2002-03-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR bootstrap/4192
+	* config/fr30/fr30.md (jump): Comment out clobber of fixed register.
+
+	* genemit.c (output_added_clobbers_hard_reg_p): Only output return
+	stmt if some case has been output.
+
+2002-03-20  Jakub Jelinek  <jakub@redhat.com>
+
 	PR c/5972
 	* config/i386/i386.md (movdicc_c_rex64, movsicc_noc, movhicc_noc,
 	movsfcc_1, movdfcc_1): Add %O2.

gcc/config/fr30/fr30.md

@@ -1303,9 +1303,12 @@
 ;; Normal unconditional jump.
 ;; For a description of the computation of the length 
 ;; attribute see the branch patterns above.
+;;
+;; Although this instruction really clobbers r0, flow
+;; relies on jump being simplejump_p in several places
+;; and as r0 is fixed, this doesn't change anything
 (define_insn "jump"
-  [(set (pc) (label_ref (match_operand 0 "" "")))
-   (clobber (reg:SI 0))]
+  [(set (pc) (label_ref (match_operand 0 "" "")))]
   ""
   "*
   {

gcc/genemit.c

@@ -722,7 +722,7 @@ output_added_clobbers_hard_reg_p ()
 {
   struct clobber_pat *clobber;
   struct clobber_ent *ent;
-  int clobber_p;
+  int clobber_p, used;
 
   printf ("\n\nint\nadded_clobbers_hard_reg_p (insn_code_number)\n");
   printf ("     int insn_code_number;\n");
@@ -732,12 +732,17 @@ output_added_clobbers_hard_reg_p ()
 
   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
     {
+      used = 0;
       for (clobber = clobber_list; clobber; clobber = clobber->next)
 	if (clobber->has_hard_reg == clobber_p)
 	  for (ent = clobber->insns; ent; ent = ent->next)
-	    printf ("    case %d:\n", ent->code_number);
+	    {
+	      printf ("    case %d:\n", ent->code_number);
+	      used++;
+	    }
 
-      printf ("      return %d;\n\n", clobber_p);
+      if (used)
+	printf ("      return %d;\n\n", clobber_p);
     }
 
   printf ("    default:\n");

gcc/testsuite/ChangeLog

+2002-03-20  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.c-torture/compile/20020320-1.c: New test.
+
 2002-03-19  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc.c-torture/compile/20020318-1.c: New test.

gcc/testsuite/gcc.c-torture/compile/20020320-1.c

+/* PR bootstrap/4192
+   This testcase caused infinite loop in flow (several places),
+   because flow assumes gen_jump generates simple_jump_p.  */
+
+typedef void (*T) (void);
+extern T x[];
+
+void
+foo (void)
+{
+  static T *p = x;
+  static _Bool a;
+  T f;
+
+  if (__builtin_expect (a, 0))
+    return;
+
+  while ((f = *p))
+    {
+      p++;
+      f ();
+    }
+  a = 1;
+}