[PATCH] use cfglayout mode for instatiate_virtual_regs

[Nathan Froyd <froydnj@codesourcery.com>]

As $SUBJECT suggests.  The patch looks much bigger than it actually is
due to re-indentation.

Tested on x86_64-unknown-linux-gnu.  OK to commit?

-Nathan

	* function.c (instantiate_virtual_regs): Use FOR_EACH_BB and
	FOR_BB_INSNS_SAFE to iterate through insns.  Re-indent.
	* passes.c (init_optimization_passes): Move
	pass_instantiate_virtual_regs after pass_into_cfg_layout_mode.

diff --git a/gcc/function.c b/gcc/function.c
index a1ea482..49404c8 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -1883,7 +1883,7 @@ instantiate_decls (tree fndecl)
 static unsigned int
 instantiate_virtual_regs (void)
 {
-  rtx insn;
+  basic_block bb;
 
   /* Compute the offsets to use for this function.  */
   in_arg_offset = FIRST_PARM_OFFSET (current_function_decl);
@@ -1901,33 +1901,40 @@ instantiate_virtual_regs (void)
 
   /* Scan through all the insns, instantiating every virtual register still
      present.  */
-  for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
-    if (INSN_P (insn))
-      {
-	/* These patterns in the instruction stream can never be recognized.
-	   Fortunately, they shouldn't contain virtual registers either.  */
-	if (GET_CODE (PATTERN (insn)) == USE
-	    || GET_CODE (PATTERN (insn)) == CLOBBER
-	    || GET_CODE (PATTERN (insn)) == ADDR_VEC
-	    || GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC
-	    || GET_CODE (PATTERN (insn)) == ASM_INPUT)
-	  continue;
-	else if (DEBUG_INSN_P (insn))
-	  for_each_rtx (&INSN_VAR_LOCATION (insn),
-			instantiate_virtual_regs_in_rtx, NULL);
-	else
-	  instantiate_virtual_regs_in_insn (insn);
+  FOR_EACH_BB (bb)
+    {
+      rtx insn, curr;
 
-	if (INSN_DELETED_P (insn))
-	  continue;
+      FOR_BB_INSNS_SAFE (bb, insn, curr)
+	{
+	  if (INSN_P (insn))
+	    {
+	      /* These patterns in the instruction stream can never be recognized.
+		 Fortunately, they shouldn't contain virtual registers either.  */
+	      if (GET_CODE (PATTERN (insn)) == USE
+		  || GET_CODE (PATTERN (insn)) == CLOBBER
+		  || GET_CODE (PATTERN (insn)) == ADDR_VEC
+		  || GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC
+		  || GET_CODE (PATTERN (insn)) == ASM_INPUT)
+		continue;
+	      else if (DEBUG_INSN_P (insn))
+		for_each_rtx (&INSN_VAR_LOCATION (insn),
+			      instantiate_virtual_regs_in_rtx, NULL);
+	      else
+		instantiate_virtual_regs_in_insn (insn);
 
-	for_each_rtx (&REG_NOTES (insn), instantiate_virtual_regs_in_rtx, NULL);
+	      if (INSN_DELETED_P (insn))
+		continue;
 
-	/* Instantiate any virtual registers in CALL_INSN_FUNCTION_USAGE.  */
-	if (CALL_P (insn))
-	  for_each_rtx (&CALL_INSN_FUNCTION_USAGE (insn),
-			instantiate_virtual_regs_in_rtx, NULL);
-      }
+	      for_each_rtx (&REG_NOTES (insn), instantiate_virtual_regs_in_rtx, NULL);
+
+	      /* Instantiate any virtual registers in CALL_INSN_FUNCTION_USAGE.  */
+	      if (CALL_P (insn))
+		for_each_rtx (&CALL_INSN_FUNCTION_USAGE (insn),
+			      instantiate_virtual_regs_in_rtx, NULL);
+	    }
+	}
+    }
 
   /* Instantiate the virtual registers in the DECLs for debugging purposes.  */
   instantiate_decls (current_function_decl);
@@ -1963,7 +1970,7 @@ struct rtl_opt_pass pass_instantiate_virtual_regs =
   NULL,                                 /* next */
   0,                                    /* static_pass_number */
   TV_NONE,                              /* tv_id */
-  0,                                    /* properties_required */
+  PROP_cfglayout,                       /* properties_required */
   0,                                    /* properties_provided */
   0,                                    /* properties_destroyed */
   0,                                    /* todo_flags_start */
diff --git a/gcc/passes.c b/gcc/passes.c
index 42a3239..3353557 100644
--- a/gcc/passes.c
+++ b/gcc/passes.c
@@ -956,8 +956,8 @@ init_optimization_passes (void)
       NEXT_PASS (pass_rtl_eh);
       NEXT_PASS (pass_initial_value_sets);
       NEXT_PASS (pass_unshare_all_rtl);
-      NEXT_PASS (pass_instantiate_virtual_regs);
       NEXT_PASS (pass_into_cfg_layout_mode);
+      NEXT_PASS (pass_instantiate_virtual_regs);
       NEXT_PASS (pass_jump2);
       NEXT_PASS (pass_lower_subreg);
       NEXT_PASS (pass_df_initialize_opt);