Allow for AUTO_INC notes even before reload

[Geoffrey Keating]

We now call flow just _before_ reload too, and it seems that AUTO_INC
notes can be around then.

Tested on stormy16-elf and i686-linux-gnu.

-- 
Geoff Keating <geoffk@redhat.com>

===File ~/patches/gcc-stormy-deadautoinc.patch==============
2001-11-09  Geoffrey Keating  <geoffk@redhat.com>

	* flow.c (insn_dead_p): Allow for AUTO_INC notes all the time.

Index: testsuite/ChangeLog
2001-11-09  Geoffrey Keating  <geoffk@redhat.com>

	* gcc.c-torture/execute/20011109-2.c: New test.

Index: flow.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/flow.c,v
retrieving revision 1.489
diff -p -u -p -r1.489 flow.c
--- flow.c	2001/10/29 11:45:44	1.489
+++ flow.c	2001/11/09 22:51:42
@@ -1892,21 +1892,18 @@ insn_dead_p (pbi, x, call_ok, notes)
   enum rtx_code code = GET_CODE (x);
 
 #ifdef AUTO_INC_DEC
-  /* If flow is invoked after reload, we must take existing AUTO_INC
-     expresions into account.  */
-  if (reload_completed)
+  /* As flow is invoked after combine, we must take existing AUTO_INC
+     expressions into account.  */
+  for (; notes; notes = XEXP (notes, 1))
     {
-      for (; notes; notes = XEXP (notes, 1))
+      if (REG_NOTE_KIND (notes) == REG_INC)
 	{
-	  if (REG_NOTE_KIND (notes) == REG_INC)
-	    {
-	      int regno = REGNO (XEXP (notes, 0));
-
-	      /* Don't delete insns to set global regs.  */
-	      if ((regno < FIRST_PSEUDO_REGISTER && global_regs[regno])
-		  || REGNO_REG_SET_P (pbi->reg_live, regno))
-		return 0;
-	    }
+	  int regno = REGNO (XEXP (notes, 0));
+	  
+	  /* Don't delete insns to set global regs.  */
+	  if ((regno < FIRST_PSEUDO_REGISTER && global_regs[regno])
+	      || REGNO_REG_SET_P (pbi->reg_live, regno))
+	    return 0;
 	}
     }
 #endif
Index: testsuite/gcc.c-torture/execute/20011109-2.c
===================================================================
RCS file: 20011109-2.c
diff -N 20011109-2.c
--- /dev/null	Tue May  5 13:32:27 1998
+++ 20011109-2.c	Fri Nov  9 14:51:50 2001
@@ -0,0 +1,10 @@
+int main(void)
+{
+  char *c1 = "foo";
+  char *c2 = "foo";
+  int i;
+  for (i = 0; i < 3; i++)
+    if (c1[i] != c2[i])
+      abort ();
+  exit (0);
+}
============================================================