[PATCH] some small fixes

[Roman Zippel <zippel at linux-m68k dot org>]

Hi,

I'm currently trying to get gcc for linux-m68k working again. I can
crosscompile again, but bootstrap fails at the 3rd stage.
Here are some small patches to get at least that far:

* dwarf2out.c: define default for ACCUMULATE_OUTGOING_ARGS
* emit-rtl.c (init_emit_once): add CCmode to CC0
* predict.c (expected_value_to_br_prob): simplify_rtx returns
  const_true_rtx or const0_rtx

The first patch is only needed for 3.0, the other two for 3.0 and 3.1.
The first and third patch fix the problems mentioned in c/1795. I'm not
sure whether the second patch is really the correct fix, but without it
simplify_relational_operation() aborts for something like "(eq (cc0)
(symbol_ref:SI ..))"  during simplify_rtx().

Finally the following patch for regclass.c is also needed for 3.0:

----------------------------
revision 1.119
date: 2001/05/09 13:40:49;  author: aoliva;  state: Exp;  lines: +6 -1
* regclass.c (scan_one_insn): Update REG_N_REFS when optimizing
handling of two-address insns.
----------------------------

bye, Roman

Index: gcc/dwarf2out.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/dwarf2out.c,v
retrieving revision 1.242.2.19
diff -u -r1.242.2.19 dwarf2out.c
--- dwarf2out.c	2001/05/31 01:12:56	1.242.2.19
+++ dwarf2out.c	2001/06/02 15:00:38
@@ -57,6 +57,10 @@
 #include "md5.h"
 #include "tm_p.h"

+#ifndef ACCUMULATE_OUTGOING_ARGS
+#define ACCUMULATE_OUTGOING_ARGS 0
+#endif
+
 /* DWARF2 Abbreviation Glossary:
    CFA = Canonical Frame Address
 	   a fixed address on the stack which identifies a call frame.
Index: gcc/emit-rtl.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/emit-rtl.c,v
retrieving revision 1.162.2.4
diff -u -r1.162.2.4 emit-rtl.c
--- emit-rtl.c	2001/05/14 17:49:55	1.162.2.4
+++ emit-rtl.c	2001/06/02 15:00:42
@@ -4109,7 +4109,7 @@
      is in a union and some compilers can't initialize unions.  */

   pc_rtx = gen_rtx (PC, VOIDmode);
-  cc0_rtx = gen_rtx (CC0, VOIDmode);
+  cc0_rtx = gen_rtx (CC0, CCmode);
   stack_pointer_rtx = gen_raw_REG (Pmode, STACK_POINTER_REGNUM);
   frame_pointer_rtx = gen_raw_REG (Pmode, FRAME_POINTER_REGNUM);
   if (hard_frame_pointer_rtx == 0)
Index: gcc/predict.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/predict.c,v
retrieving revision 1.15.4.1
diff -u -r1.15.4.1 predict.c
--- predict.c	2001/05/12 20:32:37	1.15.4.1
+++ predict.c	2001/06/02 15:00:47
@@ -295,7 +295,7 @@
       cond = simplify_rtx (cond);

       /* Turn the condition into a scaled branch probability.  */
-      if (cond == const1_rtx)
+      if (cond == const_true_rtx)
 	cond = GEN_INT (PROB_VERY_LIKELY);
       else if (cond == const0_rtx)
 	cond = GEN_INT (PROB_VERY_UNLIKELY);