Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@201 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 1839 insertions, 0 deletions

diff --git a/gcc/calls.c b/gcc/calls.c
new file mode 100644
index 00000000000..9054f459e8b
--- /dev/null
+++ b/gcc/calls.c
@@ -0,0 +1,1839 @@
+/* Convert function calls to rtl insns, for GNU C compiler.
+   Copyright (C) 1989, 1992 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "config.h"
+#include "rtl.h"
+#include "tree.h"
+#include "flags.h"
+#include "expr.h"
+#include "insn-flags.h"
+
+/* Decide whether a function's arguments should be processed
+   from first to last or from last to first.  */
+
+#ifdef STACK_GROWS_DOWNWARD
+#ifdef PUSH_ROUNDING
+#define PUSH_ARGS_REVERSED	/* If it's last to first */
+#endif
+#endif
+
+/* Like STACK_BOUNDARY but in units of bytes, not bits.  */
+#define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT)
+
+/* Data structure and subroutines used within expand_call.  */
+
+struct arg_data
+{
+  /* Tree node for this argument.  */
+  tree tree_value;
+  /* Current RTL value for argument, or 0 if it isn't precomputed.  */
+  rtx value;
+  /* Initially-compute RTL value for argument; only for const functions.  */
+  rtx initial_value;
+  /* Register to pass this argument in, 0 if passed on stack, or an
+     EXPR_LIST if the arg is to be copied into multiple different
+     registers.  */
+  rtx reg;
+  /* Number of registers to use.  0 means put the whole arg in registers.
+     Also 0 if not passed in registers.  */
+  int partial;
+  /* Non-zero if argument must be passed on stack.  */
+  int pass_on_stack;
+  /* Offset of this argument from beginning of stack-args.  */
+  struct args_size offset;
+  /* Similar, but offset to the start of the stack slot.  Different from
+     OFFSET if this arg pads downward.  */
+  struct args_size slot_offset;
+  /* Size of this argument on the stack, rounded up for any padding it gets,
+     parts of the argument passed in registers do not count.
+     If REG_PARM_STACK_SPACE is defined, then register parms
+     are counted here as well.  */
+  struct args_size size;
+  /* Location on the stack at which parameter should be stored.  The store
+     has already been done if STACK == VALUE.  */
+  rtx stack;
+  /* Location on the stack of the start of this argument slot.  This can
+     differ from STACK if this arg pads downward.  This location is known
+     to be aligned to FUNCTION_ARG_BOUNDARY.  */
+  rtx stack_slot;
+#ifdef ACCUMULATE_OUTGOING_ARGS
+  /* Place that this stack area has been saved, if needed.  */
+  rtx save_area;
+#endif
+};
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+/* A vector of one char per word of stack space.  A byte if non-zero if
+   the corresponding stack location has been used.
+   This vector is used to prevent a function call within an argument from
+   clobbering any stack already set up.  */
+static char *stack_usage_map;
+
+/* Size of STACK_USAGE_MAP.  */
+static int highest_outgoing_arg_in_use;
+#endif
+
+static void store_one_arg ();
+extern enum machine_mode mode_for_size ();
+
+/* Return 1 if EXP contains a call to the built-in function `alloca'.  */
+
+static int
+calls_alloca (exp)
+     tree exp;
+{
+  register int i;
+  int type = TREE_CODE_CLASS (TREE_CODE (exp));
+  int length = tree_code_length[(int) TREE_CODE (exp)];
+
+  /* Only expressions and references can contain calls.  */
+
+  if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r')
+    return 0;
+
+  switch (TREE_CODE (exp))
+    {
+    case CALL_EXPR:
+      if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
+	  && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
+	      == FUNCTION_DECL)
+	  && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
+	  && (DECL_FUNCTION_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
+	      == BUILT_IN_ALLOCA))
+	return 1;
+
+      /* Third operand is RTL.  */
+      length = 2;
+      break;
+
+    case SAVE_EXPR:
+      if (SAVE_EXPR_RTL (exp) != 0)
+	return 0;
+      break;
+
+    case BLOCK:
+      /* Must not look at BLOCK_SUPERCONTEXT since it will point back to
+	 us.  */
+      length = 3;
+      break;
+
+    case METHOD_CALL_EXPR:
+      length = 3;
+      break;
+
+    case WITH_CLEANUP_EXPR:
+      length = 1;
+      break;
+
+    case RTL_EXPR:
+      return 0;
+    }
+
+  for (i = 0; i < length; i++)
+    if (TREE_OPERAND (exp, i) != 0
+	&& calls_alloca (TREE_OPERAND (exp, i)))
+      return 1;
+
+  return 0;
+}
+
+/* Force FUNEXP into a form suitable for the address of a CALL,
+   and return that as an rtx.  Also load the static chain register
+   if FNDECL is a nested function.
+
+   USE_INSNS points to a variable holding a chain of USE insns
+   to which a USE of the static chain
+   register should be added, if required.  */
+
+rtx
+prepare_call_address (funexp, fndecl, use_insns)
+     rtx funexp;
+     tree fndecl;
+     rtx *use_insns;
+{
+  rtx static_chain_value = 0;
+
+  funexp = protect_from_queue (funexp, 0);
+
+  if (fndecl != 0)
+    /* Get possible static chain value for nested function in C. */
+    static_chain_value = lookup_static_chain (fndecl);
+
+  /* Make a valid memory address and copy constants thru pseudo-regs,
+     but not for a constant address if -fno-function-cse.  */
+  if (GET_CODE (funexp) != SYMBOL_REF)
+    funexp = memory_address (FUNCTION_MODE, funexp);
+  else
+    {
+#ifndef NO_FUNCTION_CSE
+      if (optimize && ! flag_no_function_cse)
+#ifdef NO_RECURSIVE_FUNCTION_CSE
+	if (fndecl != current_function_decl)
+#endif
+	  funexp = force_reg (Pmode, funexp);
+#endif
+    }
+
+  if (static_chain_value != 0)
+    {
+      emit_move_insn (static_chain_rtx, static_chain_value);
+
+      /* Put the USE insn in the chain we were passed.  It will later be
+	 output immediately in front of the CALL insn.  */
+      push_to_sequence (*use_insns);
+      emit_insn (gen_rtx (USE, VOIDmode, static_chain_rtx));
+      *use_insns = get_insns ();
+      end_sequence ();
+    }
+
+  return funexp;
+}
+
+/* Generate instructions to call function FUNEXP,
+   and optionally pop the results.
+   The CALL_INSN is the first insn generated.
+
+   FUNTYPE is the data type of the function, or, for a library call,
+   the identifier for the name of the call.  This is given to the
+   macro RETURN_POPS_ARGS to determine whether this function pops its own args.
+
+   STACK_SIZE is the number of bytes of arguments on the stack,
+   rounded up to STACK_BOUNDARY; zero if the size is variable.
+   This is both to put into the call insn and
+   to generate explicit popping code if necessary.
+
+   STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value.
+   It is zero if this call doesn't want a structure value.
+
+   NEXT_ARG_REG is the rtx that results from executing
+     FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1)
+   just after all the args have had their registers assigned.
+   This could be whatever you like, but normally it is the first
+   arg-register beyond those used for args in this call,
+   or 0 if all the arg-registers are used in this call.
+   It is passed on to `gen_call' so you can put this info in the call insn.
+
+   VALREG is a hard register in which a value is returned,
+   or 0 if the call does not return a value.
+
+   OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before
+   the args to this call were processed.
+   We restore `inhibit_defer_pop' to that value.
+
+   USE_INSNS is a chain of USE insns to be emitted immediately before
+   the actual CALL insn.
+
+   IS_CONST is true if this is a `const' call.  */
+
+void
+emit_call_1 (funexp, funtype, stack_size, struct_value_size, next_arg_reg,
+	     valreg, old_inhibit_defer_pop, use_insns, is_const)
+     rtx funexp;
+     tree funtype;
+     int stack_size;
+     int struct_value_size;
+     rtx next_arg_reg;
+     rtx valreg;
+     int old_inhibit_defer_pop;
+     rtx use_insns;
+     int is_const;
+{
+  rtx stack_size_rtx = gen_rtx (CONST_INT, VOIDmode, stack_size);
+  rtx struct_value_size_rtx = gen_rtx (CONST_INT, VOIDmode, struct_value_size);
+  rtx call_insn;
+  int already_popped = 0;
+
+  /* Ensure address is valid.  SYMBOL_REF is already valid, so no need,
+     and we don't want to load it into a register as an optimization,
+     because prepare_call_address already did it if it should be done.  */
+  if (GET_CODE (funexp) != SYMBOL_REF)
+    funexp = memory_address (FUNCTION_MODE, funexp);
+
+#ifndef ACCUMULATE_OUTGOING_ARGS
+#if defined (HAVE_call_pop) && defined (HAVE_call_value_pop)
+  if (HAVE_call_pop && HAVE_call_value_pop
+      && (RETURN_POPS_ARGS (funtype, stack_size) > 0 || stack_size == 0))
+    {
+      rtx n_pop = gen_rtx (CONST_INT, VOIDmode, 
+			   RETURN_POPS_ARGS (funtype, stack_size));
+      rtx pat;
+
+      /* If this subroutine pops its own args, record that in the call insn
+	 if possible, for the sake of frame pointer elimination.  */
+      if (valreg)
+	pat = gen_call_value_pop (valreg,
+				  gen_rtx (MEM, FUNCTION_MODE, funexp),
+				  stack_size_rtx, next_arg_reg, n_pop);
+      else
+	pat = gen_call_pop (gen_rtx (MEM, FUNCTION_MODE, funexp),
+			    stack_size_rtx, next_arg_reg, n_pop);
+
+      emit_call_insn (pat);
+      already_popped = 1;
+    }
+  else
+#endif
+#endif
+
+#if defined (HAVE_call) && defined (HAVE_call_value)
+  if (HAVE_call && HAVE_call_value)
+    {
+      if (valreg)
+	emit_call_insn (gen_call_value (valreg,
+					gen_rtx (MEM, FUNCTION_MODE, funexp),
+					stack_size_rtx, next_arg_reg));
+      else
+	emit_call_insn (gen_call (gen_rtx (MEM, FUNCTION_MODE, funexp),
+				  stack_size_rtx, next_arg_reg,
+				  struct_value_size_rtx));
+    }
+  else
+#endif
+    abort ();
+
+  /* Find the CALL insn we just emitted and write the USE insns before it.  */
+  for (call_insn = get_last_insn ();
+       call_insn && GET_CODE (call_insn) != CALL_INSN;
+       call_insn = PREV_INSN (call_insn))
+    ;
+
+  if (! call_insn)
+    abort ();
+
+  /* Put the USE insns before the CALL.  */
+  emit_insns_before (use_insns, call_insn);
+
+  /* If this is a const call, then set the insn's unchanging bit.  */
+  if (is_const)
+    CONST_CALL_P (call_insn) = 1;
+
+  inhibit_defer_pop = old_inhibit_defer_pop;
+
+#ifndef ACCUMULATE_OUTGOING_ARGS
+  /* If returning from the subroutine does not automatically pop the args,
+     we need an instruction to pop them sooner or later.
+     Perhaps do it now; perhaps just record how much space to pop later.
+
+     If returning from the subroutine does pop the args, indicate that the
+     stack pointer will be changed.  */
+
+  if (stack_size != 0 && RETURN_POPS_ARGS (funtype, stack_size) > 0)
+    {
+      if (!already_popped)
+	emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx));
+      stack_size -= RETURN_POPS_ARGS (funtype, stack_size);
+      stack_size_rtx = gen_rtx (CONST_INT, VOIDmode, stack_size);
+    }
+
+  if (stack_size != 0)
+    {
+      if (flag_defer_pop && inhibit_defer_pop == 0)
+	pending_stack_adjust += stack_size;
+      else
+	adjust_stack (stack_size_rtx);
+    }
+#endif
+}
+
+/* Generate all the code for a function call
+   and return an rtx for its value.
+   Store the value in TARGET (specified as an rtx) if convenient.
+   If the value is stored in TARGET then TARGET is returned.
+   If IGNORE is nonzero, then we ignore the value of the function call.  */
+
+rtx
+expand_call (exp, target, ignore, modifier)
+     tree exp;
+     rtx target;
+     int ignore;
+     enum expand_modifier modifier;
+{
+  /* List of actual parameters.  */
+  tree actparms = TREE_OPERAND (exp, 1);
+  /* RTX for the function to be called.  */
+  rtx funexp;
+  /* Tree node for the function to be called (not the address!).  */
+  tree funtree;
+  /* Data type of the function.  */
+  tree funtype;
+  /* Declaration of the function being called,
+     or 0 if the function is computed (not known by name).  */
+  tree fndecl = 0;
+  char *name = 0;
+
+  /* Register in which non-BLKmode value will be returned,
+     or 0 if no value or if value is BLKmode.  */
+  rtx valreg;
+  /* Address where we should return a BLKmode value;
+     0 if value not BLKmode.  */
+  rtx structure_value_addr = 0;
+  /* Nonzero if that address is being passed by treating it as
+     an extra, implicit first parameter.  Otherwise,
+     it is passed by being copied directly into struct_value_rtx.  */
+  int structure_value_addr_parm = 0;
+  /* Size of aggregate value wanted, or zero if none wanted
+     or if we are using the non-reentrant PCC calling convention
+     or expecting the value in registers.  */
+  int struct_value_size = 0;
+  /* Nonzero if called function returns an aggregate in memory PCC style,
+     by returning the address of where to find it.  */
+  int pcc_struct_value = 0;
+
+  /* Number of actual parameters in this call, including struct value addr.  */
+  int num_actuals;
+  /* Number of named args.  Args after this are anonymous ones
+     and they must all go on the stack.  */
+  int n_named_args;
+  /* Count arg position in order args appear.  */
+  int argpos;
+
+  /* Vector of information about each argument.
+     Arguments are numbered in the order they will be pushed,
+     not the order they are written.  */
+  struct arg_data *args;
+
+  /* Total size in bytes of all the stack-parms scanned so far.  */
+  struct args_size args_size;
+  /* Size of arguments before any adjustments (such as rounding).  */
+  struct args_size original_args_size;
+  /* Data on reg parms scanned so far.  */
+  CUMULATIVE_ARGS args_so_far;
+  /* Nonzero if a reg parm has been scanned.  */
+  int reg_parm_seen;
+
+  /* Nonzero if we must avoid push-insns in the args for this call. 
+     If stack space is allocated for register parameters, but not by the
+     caller, then it is preallocated in the fixed part of the stack frame.
+     So the entire argument block must then be preallocated (i.e., we
+     ignore PUSH_ROUNDING in that case).  */
+
+#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
+  int must_preallocate = 1;
+#else
+#ifdef PUSH_ROUNDING
+  int must_preallocate = 0;
+#else
+  int must_preallocate = 1;
+#endif
+#endif
+
+  /* 1 if scanning parms front to back, -1 if scanning back to front.  */
+  int inc;
+  /* Address of space preallocated for stack parms
+     (on machines that lack push insns), or 0 if space not preallocated.  */
+  rtx argblock = 0;
+
+  /* Nonzero if it is plausible that this is a call to alloca.  */
+  int may_be_alloca;
+  /* Nonzero if this is a call to setjmp or a related function.  */
+  int returns_twice;
+  /* Nonzero if this is a call to `longjmp'.  */
+  int is_longjmp;
+  /* Nonzero if this is a call to an inline function.  */
+  int is_integrable = 0;
+  /* Nonzero if this is a call to __builtin_new.  */
+  int is_builtin_new;
+  /* Nonzero if this is a call to a `const' function.
+     Note that only explicitly named functions are handled as `const' here.  */
+  int is_const = 0;
+  /* Nonzero if this is a call to a `volatile' function.  */
+  int is_volatile = 0;
+#if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
+  /* Define the boundary of the register parm stack space that needs to be
+     save, if any.  */
+  int low_to_save = -1, high_to_save;
+  rtx save_area = 0;		/* Place that it is saved */
+#endif
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+  int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
+  char *initial_stack_usage_map = stack_usage_map;
+#endif
+
+  rtx old_stack_level = 0;
+  int old_pending_adj;
+  int old_inhibit_defer_pop = inhibit_defer_pop;
+  tree old_cleanups = cleanups_this_call;
+
+  rtx use_insns = 0;
+
+  register tree p;
+  register int i;
+
+  /* See if we can find a DECL-node for the actual function.
+     As a result, decide whether this is a call to an integrable function.  */
+
+  p = TREE_OPERAND (exp, 0);
+  if (TREE_CODE (p) == ADDR_EXPR)
+    {
+      fndecl = TREE_OPERAND (p, 0);
+      if (TREE_CODE (fndecl) != FUNCTION_DECL)
+	{
+	  /* May still be a `const' function if it is
+	     a call through a pointer-to-const.
+	     But we don't handle that.  */
+	  fndecl = 0;
+	}
+      else
+	{
+	  if (!flag_no_inline
+	      && fndecl != current_function_decl
+	      && DECL_SAVED_INSNS (fndecl))
+	    is_integrable = 1;
+	  else if (! TREE_ADDRESSABLE (fndecl))
+	    {
+	      /* In case this function later becomes inlineable,
+		 record that there was already a non-inline call to it.
+
+		 Use abstraction instead of setting TREE_ADDRESSABLE
+		 directly.  */
+	      if (TREE_INLINE (fndecl) && extra_warnings && !flag_no_inline)
+		warning_with_decl (fndecl, "can't inline call to `%s' which was declared inline");
+	      mark_addressable (fndecl);
+	    }
+
+	  if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl))
+	    is_const = 1;
+	}
+    }
+
+  is_volatile = TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (p)));
+
+  /* Warn if this value is an aggregate type,
+     regardless of which calling convention we are using for it.  */
+  if (warn_aggregate_return
+      && (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
+	  || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE
+	  || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE))
+    warning ("function call has aggregate value");
+
+  /* Set up a place to return a structure.  */
+
+  /* Cater to broken compilers.  */
+  if (aggregate_value_p (exp))
+    {
+      /* This call returns a big structure.  */
+      is_const = 0;
+
+#ifdef PCC_STATIC_STRUCT_RETURN
+      if (flag_pcc_struct_return)
+	{
+	  pcc_struct_value = 1;
+	  is_integrable = 0;  /* Easier than making that case work right.  */
+	}
+      else
+#endif
+	{
+	  struct_value_size = int_size_in_bytes (TREE_TYPE (exp));
+
+	  if (struct_value_size < 0)
+	    abort ();
+
+	  if (target && GET_CODE (target) == MEM)
+	    structure_value_addr = XEXP (target, 0);
+	  else
+	    {
+	      /* Assign a temporary on the stack to hold the value.  */
+
+	      /* For variable-sized objects, we must be called with a target
+		 specified.  If we were to allocate space on the stack here,
+		 we would have no way of knowing when to free it.  */
+
+	      structure_value_addr
+		= XEXP (assign_stack_temp (BLKmode, struct_value_size, 1), 0);
+	      target = 0;
+	    }
+	}
+    }
+
+  /* If called function is inline, try to integrate it.  */
+
+  if (is_integrable)
+    {
+      rtx temp;
+
+      temp = expand_inline_function (fndecl, actparms, target,
+				     ignore, TREE_TYPE (exp),
+				     structure_value_addr);
+
+      /* If inlining succeeded, return.  */
+      if ((int) temp != -1)
+	{
+	  /* Perform all cleanups needed for the arguments of this call
+	     (i.e. destructors in C++).  It is ok if these destructors
+	     clobber RETURN_VALUE_REG, because the only time we care about
+	     this is when TARGET is that register.  But in C++, we take
+	     care to never return that register directly.  */
+	  expand_cleanups_to (old_cleanups);
+
+	  /* If the result is equivalent to TARGET, return TARGET to simplify
+	     checks in store_expr.  They can be equivalent but not equal in the
+	     case of a function that returns BLKmode.  */
+	  if (temp != target && rtx_equal_p (temp, target))
+	    return target;
+	  return temp;
+	}
+
+      /* If inlining failed, mark FNDECL as needing to be compiled
+	 separately after all.  */
+      mark_addressable (fndecl);
+    }
+
+  /* When calling a const function, we must pop the stack args right away,
+     so that the pop is deleted or moved with the call.  */
+  if (is_const)
+    NO_DEFER_POP;
+
+  function_call_count++;
+
+  if (fndecl && DECL_NAME (fndecl))
+    name = IDENTIFIER_POINTER (DECL_NAME (fndecl));
+
+#if 0
+  /* Unless it's a call to a specific function that isn't alloca,
+     if it has one argument, we must assume it might be alloca.  */
+
+  may_be_alloca =
+    (!(fndecl != 0 && strcmp (name, "alloca"))
+     && actparms != 0
+     && TREE_CHAIN (actparms) == 0);
+#else
+  /* We assume that alloca will always be called by name.  It
+     makes no sense to pass it as a pointer-to-function to
+     anything that does not understand its behavior.  */
+  may_be_alloca =
+    (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6
+		 && name[0] == 'a'
+		 && ! strcmp (name, "alloca"))
+		|| (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16
+		    && name[0] == '_'
+		    && ! strcmp (name, "__builtin_alloca"))));
+#endif
+
+  /* See if this is a call to a function that can return more than once
+     or a call to longjmp.  */
+
+  returns_twice = 0;
+  is_longjmp = 0;
+
+  if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15)
+    {
+      char *tname = name;
+
+      if (name[0] == '_')
+	tname += ((name[1] == '_' && name[2] == 'x') ? 3 : 1);
+
+      if (tname[0] == 's')
+	{
+	  returns_twice
+	    = ((tname[1] == 'e'
+		&& (! strcmp (tname, "setjmp")
+		    || ! strcmp (tname, "setjmp_syscall")))
+	       || (tname[1] == 'i'
+		   && ! strcmp (tname, "sigsetjmp"))
+	       || (tname[1] == 'a'
+		   && ! strcmp (tname, "savectx")));
+	  if (tname[1] == 'i'
+	      && ! strcmp (tname, "siglongjmp"))
+	    is_longjmp = 1;
+	}
+      else if ((tname[0] == 'q' && tname[1] == 's'
+		&& ! strcmp (tname, "qsetjmp"))
+	       || (tname[0] == 'v' && tname[1] == 'f'
+		   && ! strcmp (tname, "vfork")))
+	returns_twice = 1;
+
+      else if (tname[0] == 'l' && tname[1] == 'o'
+	       && ! strcmp (tname, "longjmp"))
+	is_longjmp = 1;
+    }
+
+  is_builtin_new
+    = (name != 0
+       && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 13
+       && (!strcmp (name, "__builtin_new")));
+
+  if (may_be_alloca)
+    current_function_calls_alloca = 1;
+
+  /* Don't let pending stack adjusts add up to too much.
+     Also, do all pending adjustments now
+     if there is any chance this might be a call to alloca.  */
+
+  if (pending_stack_adjust >= 32
+      || (pending_stack_adjust > 0 && may_be_alloca))
+    do_pending_stack_adjust ();
+
+  /* Operand 0 is a pointer-to-function; get the type of the function.  */
+  funtype = TREE_TYPE (TREE_OPERAND (exp, 0));
+  if (TREE_CODE (funtype) != POINTER_TYPE)
+    abort ();
+  funtype = TREE_TYPE (funtype);
+
+  /* Push the temporary stack slot level so that we can free temporaries used
+     by each of the arguments separately.  */
+  push_temp_slots ();
+
+  /* Start updating where the next arg would go.  */
+  INIT_CUMULATIVE_ARGS (args_so_far, funtype, 0);
+
+  /* If struct_value_rtx is 0, it means pass the address
+     as if it were an extra parameter.  */
+  if (structure_value_addr && struct_value_rtx == 0)
+    {
+      actparms
+	= tree_cons (error_mark_node,
+		     make_tree (build_pointer_type (TREE_TYPE (funtype)),
+				force_reg (Pmode, structure_value_addr)),
+		     actparms);
+      structure_value_addr_parm = 1;
+    }
+
+  /* Count the arguments and set NUM_ACTUALS.  */
+  for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++;
+  num_actuals = i;
+
+  /* Compute number of named args.
+     Normally, don't include the last named arg if anonymous args follow.
+     (If no anonymous args follow, the result of list_length
+     is actually one too large.)
+
+     If SETUP_INCOMING_VARARGS is defined, this machine will be able to
+     place unnamed args that were passed in registers into the stack.  So
+     treat all args as named.  This allows the insns emitting for a specific
+     argument list to be independant of the function declaration.
+
+     If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable
+     way to pass unnamed args in registers, so we must force them into
+     memory.  */
+#ifndef SETUP_INCOMING_VARARGS
+  if (TYPE_ARG_TYPES (funtype) != 0)
+    n_named_args
+      = list_length (TYPE_ARG_TYPES (funtype)) - 1
+	/* Count the struct value address, if it is passed as a parm.  */
+	+ structure_value_addr_parm;
+  else
+#endif
+    /* If we know nothing, treat all args as named.  */
+    n_named_args = num_actuals;
+
+  /* Make a vector to hold all the information about each arg.  */
+  args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data));
+  bzero (args, num_actuals * sizeof (struct arg_data));
+
+  args_size.constant = 0;
+  args_size.var = 0;
+
+  /* In this loop, we consider args in the order they are written.
+     We fill up ARGS from the front of from the back if necessary
+     so that in any case the first arg to be pushed ends up at the front.  */
+
+#ifdef PUSH_ARGS_REVERSED
+  i = num_actuals - 1, inc = -1;
+  /* In this case, must reverse order of args
+     so that we compute and push the last arg first.  */
+#else
+  i = 0, inc = 1;
+#endif
+
+  /* I counts args in order (to be) pushed; ARGPOS counts in order written.  */
+  for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++)
+    {
+      tree type = TREE_TYPE (TREE_VALUE (p));
+
+      args[i].tree_value = TREE_VALUE (p);
+
+      /* Replace erroneous argument with constant zero.  */
+      if (type == error_mark_node || TYPE_SIZE (type) == 0)
+	args[i].tree_value = integer_zero_node, type = integer_type_node;
+
+      /* Decide where to pass this arg.
+
+	 args[i].reg is nonzero if all or part is passed in registers.
+
+	 args[i].partial is nonzero if part but not all is passed in registers,
+	 and the exact value says how many words are passed in registers.
+
+	 args[i].pass_on_stack is nonzero if the argument must at least be
+	 computed on the stack.  It may then be loaded back into registers
+	 if args[i].reg is nonzero.
+
+	 These decisions are driven by the FUNCTION_... macros and must agree
+	 with those made by function.c.  */
+
+#ifdef FUNCTION_ARG_PASS_BY_REFERENCE
+      /* See if this argument should be passed by invisible reference.  */
+      if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type), type,
+					  argpos < n_named_args))
+	{
+	  /* We make a copy of the object and pass the address to the function
+	     being called.  */
+	  int size = int_size_in_bytes (type);
+	  rtx copy;
+
+	  if (size < 0)
+	    {
+	      /* This is a variable-sized object.  Make space on the stack
+		 for it.  */
+	      rtx size_rtx = expand_expr (size_in_bytes (type), 0,
+					  VOIDmode, 0);
+
+	      if (old_stack_level == 0)
+		{
+		  old_stack_level = copy_to_mode_reg (Pmode, stack_pointer_rtx);
+		  old_pending_adj = pending_stack_adjust;
+		  pending_stack_adjust = 0;
+		}
+
+	      copy = gen_rtx (MEM, BLKmode,
+			      allocate_dynamic_stack_space (size_rtx, 0));
+	    }
+	  else
+	    copy = assign_stack_temp (TYPE_MODE (type), size, 1);
+
+	  store_expr (args[i].tree_value, copy, 0);
+
+	  args[i].tree_value = build1 (ADDR_EXPR, build_pointer_type (type),
+				       make_tree (type, copy));
+	  type = build_pointer_type (type);
+	}
+#endif
+
+      args[i].reg = FUNCTION_ARG (args_so_far, TYPE_MODE (type), type,
+				  argpos < n_named_args);
+#ifdef FUNCTION_ARG_PARTIAL_NREGS
+      if (args[i].reg)
+	args[i].partial
+	  = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, TYPE_MODE (type), type,
+					argpos < n_named_args);
+#endif
+
+      args[i].pass_on_stack = MUST_PASS_IN_STACK (TYPE_MODE (type), type);
+
+      /* If FUNCTION_ARG returned an (expr_list (nil) FOO), it means that
+	 we are to pass this arg in the register(s) designated by FOO, but
+	 also to pass it in the stack.  */
+      if (args[i].reg && GET_CODE (args[i].reg) == EXPR_LIST
+	  && XEXP (args[i].reg, 0) == 0)
+	args[i].pass_on_stack = 1, args[i].reg = XEXP (args[i].reg, 1);
+
+      /* If this is an addressable type, we must preallocate the stack
+	 since we must evaluate the object into its final location.
+
+	 If this is to be passed in both registers and the stack, it is simpler
+	 to preallocate.  */
+      if (TREE_ADDRESSABLE (type)
+	  || (args[i].pass_on_stack && args[i].reg != 0))
+	must_preallocate = 1;
+
+      /* If this is an addressable type, we cannot pre-evaluate it.  Thus,
+	 we cannot consider this function call constant.  */
+      if (TREE_ADDRESSABLE (type))
+	is_const = 0;
+
+      /* Compute the stack-size of this argument.  */
+      if (args[i].reg == 0 || args[i].partial != 0
+#ifdef REG_PARM_STACK_SPACE
+	  || REG_PARM_STACK_SPACE (fndecl) > 0
+#endif
+	  || args[i].pass_on_stack)
+	locate_and_pad_parm (TYPE_MODE (type), type,
+#ifdef STACK_PARMS_IN_REG_PARM_AREA
+			     1,
+#else
+			     args[i].reg != 0,
+#endif
+			     fndecl, &args_size, &args[i].offset,
+			     &args[i].size);
+
+#ifndef ARGS_GROW_DOWNWARD
+      args[i].slot_offset = args_size;
+#endif
+
+#ifndef REG_PARM_STACK_SPACE
+      /* If a part of the arg was put into registers,
+	 don't include that part in the amount pushed.  */
+      if (! args[i].pass_on_stack)
+	args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD)
+				  / (PARM_BOUNDARY / BITS_PER_UNIT)
+				  * (PARM_BOUNDARY / BITS_PER_UNIT));
+#endif
+      
+      /* Update ARGS_SIZE, the total stack space for args so far.  */
+
+      args_size.constant += args[i].size.constant;
+      if (args[i].size.var)
+	{
+	  ADD_PARM_SIZE (args_size, args[i].size.var);
+	}
+
+      /* Since the slot offset points to the bottom of the slot,
+	 we must record it after incrementing if the args grow down.  */
+#ifdef ARGS_GROW_DOWNWARD
+      args[i].slot_offset = args_size;
+
+      args[i].slot_offset.constant = -args_size.constant;
+      if (args_size.var)
+	{
+	  SUB_PARM_SIZE (args[i].slot_offset, args_size.var);
+	}
+#endif
+
+      /* Increment ARGS_SO_FAR, which has info about which arg-registers
+	 have been used, etc.  */
+
+      FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type,
+			    argpos < n_named_args);
+    }
+
+  /* Compute the actual size of the argument block required.  The variable
+     and constant sizes must be combined, the size may have to be rounded,
+     and there may be a minimum required size.  */
+
+  original_args_size = args_size;
+  if (args_size.var)
+    {
+      /* If this function requires a variable-sized argument list, don't try to
+	 make a cse'able block for this call.  We may be able to do this
+	 eventually, but it is too complicated to keep track of what insns go
+	 in the cse'able block and which don't.  */
+
+      is_const = 0;
+      must_preallocate = 1;
+
+      args_size.var = ARGS_SIZE_TREE (args_size);
+      args_size.constant = 0;
+
+#ifdef STACK_BOUNDARY
+      if (STACK_BOUNDARY != BITS_PER_UNIT)
+	args_size.var = round_up (args_size.var, STACK_BYTES);
+#endif
+
+#ifdef REG_PARM_STACK_SPACE
+      if (REG_PARM_STACK_SPACE (fndecl) > 0)
+	{
+	  args_size.var
+	    = size_binop (MAX_EXPR, args_size.var,
+			  size_int (REG_PARM_STACK_SPACE (fndecl)));
+
+#ifndef OUTGOING_REG_PARM_STACK_SPACE
+	  /* The area corresponding to register parameters is not to count in
+	     the size of the block we need.  So make the adjustment.  */
+	  args_size.var
+	    = size_binop (MINUS_EXPR, args_size.var,
+			  size_int (REG_PARM_STACK_SPACE (fndecl)));
+#endif
+	}
+#endif
+    }
+  else
+    {
+#ifdef STACK_BOUNDARY
+      args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
+			     / STACK_BYTES) * STACK_BYTES);
+#endif
+
+#ifdef REG_PARM_STACK_SPACE
+      args_size.constant = MAX (args_size.constant,
+				REG_PARM_STACK_SPACE (fndecl));
+#ifndef OUTGOING_REG_PARM_STACK_SPACE
+      args_size.constant -= REG_PARM_STACK_SPACE (fndecl);
+#endif
+#endif
+    }
+
+  /* See if we have or want to preallocate stack space.
+
+     If we would have to push a partially-in-regs parm
+     before other stack parms, preallocate stack space instead.
+
+     If the size of some parm is not a multiple of the required stack
+     alignment, we must preallocate.
+
+     If the total size of arguments that would otherwise create a copy in
+     a temporary (such as a CALL) is more than half the total argument list
+     size, preallocation is faster.
+
+     Another reason to preallocate is if we have a machine (like the m88k)
+     where stack alignment is required to be maintained between every
+     pair of insns, not just when the call is made.  However, we assume here
+     that such machines either do not have push insns (and hence preallocation
+     would occur anyway) or the problem is taken care of with
+     PUSH_ROUNDING.  */
+
+  if (! must_preallocate)
+    {
+      int partial_seen = 0;
+      int copy_to_evaluate_size = 0;
+
+      for (i = 0; i < num_actuals && ! must_preallocate; i++)
+	{
+	  if (args[i].partial > 0 && ! args[i].pass_on_stack)
+	    partial_seen = 1;
+	  else if (partial_seen && args[i].reg == 0)
+	    must_preallocate = 1;
+
+	  if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
+	      && (TREE_CODE (args[i].tree_value) == CALL_EXPR
+		  || TREE_CODE (args[i].tree_value) == TARGET_EXPR
+		  || TREE_CODE (args[i].tree_value) == COND_EXPR
+		  || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))))
+	    copy_to_evaluate_size
+	      += int_size_in_bytes (TREE_TYPE (args[i].tree_value));
+	}
+
+      if (copy_to_evaluate_size >= args_size.constant / 2)
+	must_preallocate = 1;
+    }
+
+  /* If the structure value address will reference the stack pointer, we must
+     stabilize it.  We don't need to do this if we know that we are not going
+     to adjust the stack pointer in processing this call.  */
+
+  if (structure_value_addr
+      && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr)
+       || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr))
+      && (args_size.var
+#ifndef ACCUMULATE_OUTGOING_ARGS
+	  || args_size.constant
+#endif
+	  ))
+    structure_value_addr = copy_to_reg (structure_value_addr);
+
+  /* If this function call is cse'able, precompute all the parameters.
+     Note that if the parameter is constructed into a temporary, this will
+     cause an additional copy because the parameter will be constructed
+     into a temporary location and then copied into the outgoing arguments.
+     If a parameter contains a call to alloca and this function uses the
+     stack, precompute the parameter.  */
+
+  for (i = 0; i < num_actuals; i++)
+    if (is_const
+	|| ((args_size.var != 0 || args_size.constant != 0)
+	    && calls_alloca (args[i].tree_value)))
+      {
+	args[i].initial_value = args[i].value
+	  = expand_expr (args[i].tree_value, 0, VOIDmode, 0);
+	preserve_temp_slots (args[i].value);
+	free_temp_slots ();
+
+	/* ANSI doesn't require a sequence point here,
+	   but PCC has one, so this will avoid some problems.  */
+	emit_queue ();
+      }
+
+  /* Now we are about to start emitting insns that can be deleted
+     if a libcall is deleted.  */
+  if (is_const)
+    start_sequence ();
+
+  /* If we have no actual push instructions, or shouldn't use them,
+     make space for all args right now.  */
+
+  if (args_size.var != 0)
+    {
+      if (old_stack_level == 0)
+	{
+	  old_stack_level = copy_to_mode_reg (Pmode, stack_pointer_rtx);
+	  old_pending_adj = pending_stack_adjust;
+	  pending_stack_adjust = 0;
+	}
+      argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0);
+    }
+  else if (must_preallocate)
+    {
+      /* Note that we must go through the motions of allocating an argument
+	 block even if the size is zero because we may be storing args
+	 in the area reserved for register arguments, which may be part of
+	 the stack frame.  */
+      int needed = args_size.constant;
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+      /* Store the maximum argument space used.  It will be pushed by the
+	 prologue.
+
+	 Since the stack pointer will never be pushed, it is possible for
+	 the evaluation of a parm to clobber something we have already
+	 written to the stack.  Since most function calls on RISC machines
+	 do not use the stack, this is uncommon, but must work correctly.
+	 
+	 Therefore, we save any area of the stack that was already written
+	 and that we are using.  Here we set up to do this by making a new
+	 stack usage map from the old one.  The actual save will be done
+	 by store_one_arg. 
+
+	 Another approach might be to try to reorder the argument
+	 evaluations to avoid this conflicting stack usage.  */
+
+      if (needed > current_function_outgoing_args_size)
+	current_function_outgoing_args_size = needed;
+
+#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
+      /* Since we will be writing into the entire argument area, the
+	 map must be allocated for its entire size, not just the part that
+	 is the responsibility of the caller.  */
+      needed += REG_PARM_STACK_SPACE (fndecl);
+#endif
+
+#ifdef ARGS_GROW_DOWNWARD
+      highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
+					 needed + 1);
+#else
+      highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, needed);
+#endif
+      stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
+
+      if (initial_highest_arg_in_use)
+	bcopy (initial_stack_usage_map, stack_usage_map,
+	       initial_highest_arg_in_use);
+
+      if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
+	bzero (&stack_usage_map[initial_highest_arg_in_use],
+	       highest_outgoing_arg_in_use - initial_highest_arg_in_use);
+      needed = 0;
+      /* No need to copy this virtual register; the space we're
+	 using gets preallocated at the start of the function
+	 so the stack pointer won't change here.  */
+      argblock = virtual_outgoing_args_rtx;
+#else /* not ACCUMULATE_OUTGOING_ARGS */
+      if (inhibit_defer_pop == 0)
+	{
+	  /* Try to reuse some or all of the pending_stack_adjust
+	     to get this space.  Maybe we can avoid any pushing.  */
+	  if (needed > pending_stack_adjust)
+	    {
+	      needed -= pending_stack_adjust;
+	      pending_stack_adjust = 0;
+	    }
+	  else
+	    {
+	      pending_stack_adjust -= needed;
+	      needed = 0;
+	    }
+	}
+      /* Special case this because overhead of `push_block' in this
+	 case is non-trivial.  */
+      if (needed == 0)
+	argblock = virtual_outgoing_args_rtx;
+      else
+	argblock = push_block (gen_rtx (CONST_INT, VOIDmode, needed), 0, 0);
+
+      /* We only really need to call `copy_to_reg' in the case where push
+	 insns are going to be used to pass ARGBLOCK to a function
+	 call in ARGS.  In that case, the stack pointer changes value
+	 from the allocation point to the call point, and hence
+	 the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well.
+	 But might as well always do it.  */
+      argblock = copy_to_reg (argblock);
+#endif /* not ACCUMULATE_OUTGOING_ARGS */
+    }
+
+  /* If we preallocated stack space, compute the address of each argument.
+     We need not ensure it is a valid memory address here; it will be 
+     validized when it is used.  */
+  if (argblock)
+    {
+      rtx arg_reg = argblock;
+      int arg_offset = 0;
+
+      if (GET_CODE (argblock) == PLUS)
+	arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1));
+
+      for (i = 0; i < num_actuals; i++)
+	{
+	  rtx offset = ARGS_SIZE_RTX (args[i].offset);
+	  rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset);
+	  rtx addr;
+
+	  /* Skip this parm if it will not be passed on the stack.  */
+	  if (! args[i].pass_on_stack && args[i].reg != 0)
+	    continue;
+
+	  if (GET_CODE (offset) == CONST_INT)
+	    addr = plus_constant (arg_reg, INTVAL (offset));
+	  else
+	    addr = gen_rtx (PLUS, Pmode, arg_reg, offset);
+
+	  addr = plus_constant (addr, arg_offset);
+	  args[i].stack
+	    = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (args[i].tree_value)), addr);
+
+	  if (GET_CODE (slot_offset) == CONST_INT)
+	    addr = plus_constant (arg_reg, INTVAL (slot_offset));
+	  else
+	    addr = gen_rtx (PLUS, Pmode, arg_reg, slot_offset);
+
+	  addr = plus_constant (addr, arg_offset);
+	  args[i].stack_slot
+	    = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (args[i].tree_value)), addr);
+	}
+    }
+					       
+#ifdef PUSH_ARGS_REVERSED
+#ifdef STACK_BOUNDARY
+  /* If we push args individually in reverse order, perform stack alignment
+     before the first push (the last arg).  */
+  if (argblock == 0)
+    anti_adjust_stack (gen_rtx (CONST_INT, VOIDmode,
+				(args_size.constant
+				 - original_args_size.constant)));
+#endif
+#endif
+
+  /* Don't try to defer pops if preallocating, not even from the first arg,
+     since ARGBLOCK probably refers to the SP.  */
+  if (argblock)
+    NO_DEFER_POP;
+
+  /* Get the function to call, in the form of RTL.  */
+  if (fndecl)
+    /* Get a SYMBOL_REF rtx for the function address.  */
+    funexp = XEXP (DECL_RTL (fndecl), 0);
+  else
+    /* Generate an rtx (probably a pseudo-register) for the address.  */
+    {
+      funexp = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
+      free_temp_slots ();	/* FUNEXP can't be BLKmode */
+      emit_queue ();
+    }
+
+  /* Figure out the register where the value, if any, will come back.  */
+  valreg = 0;
+  if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode
+      && ! structure_value_addr)
+    {
+      if (pcc_struct_value)
+	valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)),
+				      fndecl);
+      else
+	valreg = hard_function_value (TREE_TYPE (exp), fndecl);
+    }
+
+  /* Precompute all register parameters.  It isn't safe to compute anything
+     once we have started filling any specific hard regs. */
+  reg_parm_seen = 0;
+  for (i = 0; i < num_actuals; i++)
+    if (args[i].reg != 0 && ! args[i].pass_on_stack)
+      {
+	reg_parm_seen = 1;
+
+	if (args[i].value == 0)
+	  {
+	    args[i].value = expand_expr (args[i].tree_value, 0, VOIDmode, 0);
+	    preserve_temp_slots (args[i].value);
+	    free_temp_slots ();
+
+	    /* ANSI doesn't require a sequence point here,
+	       but PCC has one, so this will avoid some problems.  */
+	    emit_queue ();
+	  }
+      }
+
+#if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
+  /* The argument list is the property of the called routine and it
+     may clobber it.  If the fixed area has been used for previous
+     parameters, we must save and restore it.
+
+     Here we compute the boundary of the that needs to be saved, if any.  */
+
+  for (i = 0; i < REG_PARM_STACK_SPACE (fndecl); i++)
+    {
+      if (i >=  highest_outgoing_arg_in_use
+	  || stack_usage_map[i] == 0)
+	continue;
+
+      if (low_to_save == -1)
+	low_to_save = i;
+
+      high_to_save = i;
+    }
+
+  if (low_to_save >= 0)
+    {
+      int num_to_save = high_to_save - low_to_save + 1;
+      enum machine_mode save_mode
+	= mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
+      rtx stack_area;
+
+      /* If we don't have the required alignment, must do this in BLKmode.  */
+      if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
+			       BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
+	save_mode = BLKmode;
+
+      stack_area = gen_rtx (MEM, save_mode,
+			    memory_address (save_mode,
+					    plus_constant (argblock,
+							   low_to_save)));
+      if (save_mode == BLKmode)
+	{
+	  save_area = assign_stack_temp (BLKmode, num_to_save, 1);
+	  emit_block_move (validize_mem (save_area), stack_area,
+			   gen_rtx (CONST_INT, VOIDmode, num_to_save),
+			   PARM_BOUNDARY / BITS_PER_UNIT);
+	}
+      else
+	{
+	  save_area = gen_reg_rtx (save_mode);
+	  emit_move_insn (save_area, stack_area);
+	}
+    }
+#endif
+	  
+
+  /* Now store (and compute if necessary) all non-register parms.
+     These come before register parms, since they can require block-moves,
+     which could clobber the registers used for register parms.
+     Parms which have partial registers are not stored here,
+     but we do preallocate space here if they want that.  */
+
+  for (i = 0; i < num_actuals; i++)
+    if (args[i].reg == 0 || args[i].pass_on_stack)
+      store_one_arg (&args[i], argblock, may_be_alloca,
+		     args_size.var != 0, fndecl);
+
+  /* Now store any partially-in-registers parm.
+     This is the last place a block-move can happen.  */
+  if (reg_parm_seen)
+    for (i = 0; i < num_actuals; i++)
+      if (args[i].partial != 0 && ! args[i].pass_on_stack)
+	store_one_arg (&args[i], argblock, may_be_alloca,
+		       args_size.var != 0, fndecl);
+
+#ifndef PUSH_ARGS_REVERSED
+#ifdef STACK_BOUNDARY
+  /* If we pushed args in forward order, perform stack alignment
+     after pushing the last arg.  */
+  if (argblock == 0)
+    anti_adjust_stack (gen_rtx (CONST_INT, VOIDmode,
+				(args_size.constant
+				 - original_args_size.constant)));
+#endif
+#endif
+
+  /* Pass the function the address in which to return a structure value.  */
+  if (structure_value_addr && ! structure_value_addr_parm)
+    {
+      emit_move_insn (struct_value_rtx,
+		      force_reg (Pmode,
+				 force_operand (structure_value_addr, 0)));
+      if (GET_CODE (struct_value_rtx) == REG)
+	{
+	  push_to_sequence (use_insns);
+	  emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx));
+	  use_insns = get_insns ();
+	  end_sequence ();
+	}
+    }
+
+  /* Now do the register loads required for any wholly-register parms or any
+     parms which are passed both on the stack and in a register.  Their
+     expressions were already evaluated. 
+
+     Mark all register-parms as living through the call, putting these USE
+     insns in a list headed by USE_INSNS.  */
+
+  for (i = 0; i < num_actuals; i++)
+    {
+      rtx list = args[i].reg;
+      int partial = args[i].partial;
+
+      while (list)
+	{
+	  rtx reg;
+	  int nregs;
+
+	  /* Process each register that needs to get this arg.  */
+	  if (GET_CODE (list) == EXPR_LIST)
+	    reg = XEXP (list, 0), list = XEXP (list, 1);
+	  else
+	    reg = list, list = 0;
+
+	  /* Set to non-zero if must move a word at a time, even if just one
+	     word (e.g, partial == 1 && mode == DFmode).  Set to zero if
+	     we just use a normal move insn.  */
+	  nregs = (partial ? partial
+		   : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
+		      ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value))
+			  + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
+		      : 0));
+
+	  /* If simple case, just do move.  If normal partial, store_one_arg
+	     has already loaded the register for us.  In all other cases,
+	     load the register(s) from memory.  */
+
+	  if (nregs == 0)
+	    emit_move_insn (reg, args[i].value);
+	  else if (args[i].partial == 0 || args[i].pass_on_stack)
+	    move_block_to_reg (REGNO (reg),
+			       validize_mem (args[i].value), nregs,
+			       TYPE_MODE (TREE_TYPE (args[i].tree_value)));
+	
+	  push_to_sequence (use_insns);
+	  if (nregs == 0)
+	    emit_insn (gen_rtx (USE, VOIDmode, reg));
+	  else
+	    use_regs (REGNO (reg), nregs);
+	  use_insns = get_insns ();
+	  end_sequence ();
+
+	  /* PARTIAL referred only to the first register, so clear it for the
+	     next time.  */
+	  partial = 0;
+	}
+    }
+
+  /* Perform postincrements before actually calling the function.  */
+  emit_queue ();
+
+  /* All arguments and registers used for the call must be set up by now!  */
+
+  funexp = prepare_call_address (funexp, fndecl, &use_insns);
+
+  /* Generate the actual call instruction.  */
+  emit_call_1 (funexp, funtype, args_size.constant, struct_value_size,
+	       FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
+	       valreg, old_inhibit_defer_pop, use_insns, is_const);
+
+  /* If call is cse'able, make appropriate pair of reg-notes around it.
+     Test valreg so we don't crash; may safely ignore `const'
+     if return type is void.  */
+  if (is_const && valreg != 0)
+    {
+      rtx note = 0;
+      rtx temp = gen_reg_rtx (GET_MODE (valreg));
+      rtx insns;
+
+      /* Construct an "equal form" for the value which mentions all the
+	 arguments in order as well as the function name.  */
+#ifdef PUSH_ARGS_REVERSED
+      for (i = 0; i < num_actuals; i++)
+	note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note);
+#else
+      for (i = num_actuals - 1; i >= 0; i--)
+	note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note);
+#endif
+      note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note);
+
+      insns = get_insns ();
+      end_sequence ();
+
+      emit_libcall_block (insns, temp, valreg, note);
+
+      valreg = temp;
+    }
+
+  /* For calls to `setjmp', etc., inform flow.c it should complain
+     if nonvolatile values are live.  */
+
+  if (returns_twice)
+    {
+      emit_note (name, NOTE_INSN_SETJMP);
+      current_function_calls_setjmp = 1;
+    }
+
+  if (is_longjmp)
+    current_function_calls_longjmp = 1;
+
+  /* Notice functions that cannot return.
+     If optimizing, insns emitted below will be dead.
+     If not optimizing, they will exist, which is useful
+     if the user uses the `return' command in the debugger.  */
+
+  if (is_volatile || is_longjmp)
+    emit_barrier ();
+
+  /* For calls to __builtin_new, note that it can never return 0.
+     This is because a new handler will be called, and 0 it not
+     among the numbers it is supposed to return.  */
+#if 0
+  if (is_builtin_new)
+    emit_note (name, NOTE_INSN_BUILTIN_NEW);
+#endif
+
+  /* If value type not void, return an rtx for the value.  */
+
+  /* If there are cleanups to be called, don't use a hard reg as target.  */
+  if (cleanups_this_call != old_cleanups
+      && target && REG_P (target)
+      && REGNO (target) < FIRST_PSEUDO_REGISTER)
+    target = 0;
+
+  if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode
+      || ignore)
+    {
+      target = const0_rtx;
+    }
+  else if (structure_value_addr)
+    {
+      if (target == 0 || GET_CODE (target) != MEM)
+	target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)),
+			  memory_address (TYPE_MODE (TREE_TYPE (exp)),
+					  structure_value_addr));
+    }
+  else if (pcc_struct_value)
+    {
+      if (target == 0)
+	target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)),
+			  copy_to_reg (valreg));
+      else if (TYPE_MODE (TREE_TYPE (exp)) != BLKmode)
+	emit_move_insn (target, gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)),
+					 copy_to_reg (valreg)));
+      else
+	emit_block_move (target, gen_rtx (MEM, BLKmode, copy_to_reg (valreg)),
+			 expr_size (exp),
+			 TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
+    }
+  else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)))
+    /* TARGET and VALREG cannot be equal at this point because the latter
+       would not have REG_FUNCTION_VALUE_P true, while the former would if
+       it were referring to the same register.
+
+       If they refer to the same register, this move will be a no-op, except
+       when function inlining is being done.  */
+    emit_move_insn (target, valreg);
+  else
+    target = copy_to_reg (valreg);
+
+  /* Perform all cleanups needed for the arguments of this call
+     (i.e. destructors in C++).  */
+  expand_cleanups_to (old_cleanups);
+
+  /* If size of args is variable, restore saved stack-pointer value.  */
+
+  if (old_stack_level)
+    {
+      emit_move_insn (stack_pointer_rtx, old_stack_level);
+      pending_stack_adjust = old_pending_adj;
+    }
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+  else
+    {
+#ifdef REG_PARM_STACK_SPACE
+      if (save_area)
+	{
+	  enum machine_mode save_mode = GET_MODE (save_area);
+	  rtx stack_area
+	    = gen_rtx (MEM, save_mode,
+		       memory_address (save_mode,
+				       plus_constant (argblock, low_to_save)));
+
+	  if (save_mode != BLKmode)
+	    emit_move_insn (stack_area, save_area);
+	  else
+	    emit_block_move (stack_area, validize_mem (save_area),
+			     gen_rtx (CONST_INT, VOIDmode,
+				      high_to_save - low_to_save + 1,
+				      PARM_BOUNDARY / BITS_PER_UNIT));
+	}
+#endif
+	  
+      /* If we saved any argument areas, restore them.  */
+      for (i = 0; i < num_actuals; i++)
+	if (args[i].save_area)
+	  {
+	    enum machine_mode save_mode = GET_MODE (args[i].save_area);
+	    rtx stack_area
+	      = gen_rtx (MEM, save_mode,
+			 memory_address (save_mode,
+					 XEXP (args[i].stack_slot, 0)));
+
+	    if (save_mode != BLKmode)
+	      emit_move_insn (stack_area, args[i].save_area);
+	    else
+	      emit_block_move (stack_area, validize_mem (args[i].save_area),
+			       gen_rtx (CONST_INT, VOIDmode,
+					args[i].size.constant),
+			       PARM_BOUNDARY / BITS_PER_UNIT);
+	  }
+
+      highest_outgoing_arg_in_use = initial_highest_arg_in_use;
+      stack_usage_map = initial_stack_usage_map;
+    }
+#endif
+
+  /* If this was alloca, record the new stack level for nonlocal gotos.  */
+  if (may_be_alloca && nonlocal_goto_stack_level != 0)
+    emit_move_insn (nonlocal_goto_stack_level, stack_pointer_rtx);
+
+  pop_temp_slots ();
+
+  return target;
+}
+
+#if 0
+/* Return an rtx which represents a suitable home on the stack
+   given TYPE, the type of the argument looking for a home.
+   This is called only for BLKmode arguments.
+
+   SIZE is the size needed for this target.
+   ARGS_ADDR is the address of the bottom of the argument block for this call.
+   OFFSET describes this parameter's offset into ARGS_ADDR.  It is meaningless
+   if this machine uses push insns.  */
+
+static rtx
+target_for_arg (type, size, args_addr, offset)
+     tree type;
+     rtx size;
+     rtx args_addr;
+     struct args_size offset;
+{
+  rtx target;
+  rtx offset_rtx = ARGS_SIZE_RTX (offset);
+
+  /* We do not call memory_address if possible,
+     because we want to address as close to the stack
+     as possible.  For non-variable sized arguments,
+     this will be stack-pointer relative addressing.  */
+  if (GET_CODE (offset_rtx) == CONST_INT)
+    target = plus_constant (args_addr, INTVAL (offset_rtx));
+  else
+    {
+      /* I have no idea how to guarantee that this
+	 will work in the presence of register parameters.  */
+      target = gen_rtx (PLUS, Pmode, args_addr, offset_rtx);
+      target = memory_address (QImode, target);
+    }
+
+  return gen_rtx (MEM, BLKmode, target);
+}
+#endif
+
+/* Store a single argument for a function call
+   into the register or memory area where it must be passed.
+   *ARG describes the argument value and where to pass it.
+
+   ARGBLOCK is the address of the stack-block for all the arguments,
+   or 0 on a machine where arguemnts are pushed individually.
+
+   MAY_BE_ALLOCA nonzero says this could be a call to `alloca'
+   so must be careful about how the stack is used. 
+
+   VARIABLE_SIZE nonzero says that this was a variable-sized outgoing
+   argument stack.  This is used if ACCUMULATE_OUTGOING_ARGS to indicate
+   that we need not worry about saving and restoring the stack.
+
+   FNDECL is the declaration of the function we are calling.  */
+
+static void
+store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl)
+     struct arg_data *arg;
+     rtx argblock;
+     int may_be_alloca;
+     int variable_size;
+     tree fndecl;
+{
+  register tree pval = arg->tree_value;
+  rtx reg = 0;
+  int partial = 0;
+  int used = 0;
+  int i, lower_bound, upper_bound;
+
+  if (TREE_CODE (pval) == ERROR_MARK)
+    return;
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+  /* If this is being stored into a pre-allocated, fixed-size, stack area,
+     save any previous data at that location.  */
+  if (argblock && ! variable_size && arg->stack)
+    {
+#ifdef ARGS_GROW_DOWNWARD
+      /* stack_slot is negative, but we want to index stack_usage_map */
+      /* with positive values. */
+      if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
+	upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1;
+      else
+	abort ();
+
+      lower_bound = upper_bound - arg->size.constant;
+#else
+      if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
+	lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1));
+      else
+	lower_bound = 0;
+
+      upper_bound = lower_bound + arg->size.constant;
+#endif
+
+      for (i = lower_bound; i < upper_bound; i++)
+	if (stack_usage_map[i]
+#ifdef REG_PARM_STACK_SPACE
+	    /* Don't store things in the fixed argument area at this point;
+	       it has already been saved.  */
+	    && i > REG_PARM_STACK_SPACE (fndecl)
+#endif
+	    )
+	  break;
+
+      if (i != upper_bound)
+	{
+	  /* We need to make a save area.  See what mode we can make it.  */
+	  enum machine_mode save_mode
+	    = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1);
+	  rtx stack_area
+	    = gen_rtx (MEM, save_mode,
+		       memory_address (save_mode, XEXP (arg->stack_slot, 0)));
+
+	  if (save_mode == BLKmode)
+	    {
+	      arg->save_area = assign_stack_temp (BLKmode,
+						  arg->size.constant, 1);
+	      emit_block_move (validize_mem (arg->save_area), stack_area,
+			       gen_rtx (CONST_INT, VOIDmode,
+					arg->size.constant),
+			       PARM_BOUNDARY / BITS_PER_UNIT);
+	    }
+	  else
+	    {
+	      arg->save_area = gen_reg_rtx (save_mode);
+	      emit_move_insn (arg->save_area, stack_area);
+	    }
+	}
+    }
+#endif
+
+  /* If this isn't going to be placed on both the stack and in registers,
+     set up the register and number of words.  */
+  if (! arg->pass_on_stack)
+    reg = arg->reg, partial = arg->partial;
+
+  if (reg != 0 && partial == 0)
+    /* Being passed entirely in a register.  We shouldn't be called in
+       this case.   */
+    abort ();
+
+  /* If this is being partially passed in a register, but multiple locations
+     are specified, we assume that the one partially used is the one that is
+     listed first.  */
+  if (reg && GET_CODE (reg) == EXPR_LIST)
+    reg = XEXP (reg, 0);
+
+  /* If this is being passes partially in a register, we can't evaluate
+     it directly into its stack slot.  Otherwise, we can.  */
+  if (arg->value == 0)
+    arg->value = expand_expr (pval, partial ? 0 : arg->stack, VOIDmode, 0);
+
+  /* Don't allow anything left on stack from computation
+     of argument to alloca.  */
+  if (may_be_alloca)
+    do_pending_stack_adjust ();
+
+  if (arg->value == arg->stack)
+    /* If the value is already in the stack slot, we are done.  */
+    ;
+  else if (TYPE_MODE (TREE_TYPE (pval)) != BLKmode)
+    {
+      register int size;
+
+      /* Argument is a scalar, not entirely passed in registers.
+	 (If part is passed in registers, arg->partial says how much
+	 and emit_push_insn will take care of putting it there.)
+	 
+	 Push it, and if its size is less than the
+	 amount of space allocated to it,
+	 also bump stack pointer by the additional space.
+	 Note that in C the default argument promotions
+	 will prevent such mismatches.  */
+
+      size = GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (pval)));
+      /* Compute how much space the push instruction will push.
+	 On many machines, pushing a byte will advance the stack
+	 pointer by a halfword.  */
+#ifdef PUSH_ROUNDING
+      size = PUSH_ROUNDING (size);
+#endif
+      used = size;
+
+      /* Compute how much space the argument should get:
+	 round up to a multiple of the alignment for arguments.  */
+      if (none != FUNCTION_ARG_PADDING (TYPE_MODE (TREE_TYPE (pval)),
+					TREE_TYPE (pval)))
+	used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1)
+		 / (PARM_BOUNDARY / BITS_PER_UNIT))
+		* (PARM_BOUNDARY / BITS_PER_UNIT));
+
+      /* This isn't already where we want it on the stack, so put it there.
+	 This can either be done with push or copy insns.  */
+      emit_push_insn (arg->value, TYPE_MODE (TREE_TYPE (pval)),
+		      TREE_TYPE (pval), 0, 0, partial, reg,
+		      used - size, argblock, ARGS_SIZE_RTX (arg->offset));
+    }
+  else
+    {
+      /* BLKmode, at least partly to be pushed.  */
+
+      register int excess;
+      rtx size_rtx;
+
+      /* Pushing a nonscalar.
+	 If part is passed in registers, PARTIAL says how much
+	 and emit_push_insn will take care of putting it there.  */
+
+      /* Round its size up to a multiple
+	 of the allocation unit for arguments.  */
+
+      if (arg->size.var != 0)
+	{
+	  excess = 0;
+	  size_rtx = ARGS_SIZE_RTX (arg->size);
+	}
+      else
+	{
+	  register tree size = size_in_bytes (TREE_TYPE (pval));
+	  /* PUSH_ROUNDING has no effect on us, because
+	     emit_push_insn for BLKmode is careful to avoid it.  */
+	  excess = (arg->size.constant - TREE_INT_CST_LOW (size)
+		    + partial * UNITS_PER_WORD);
+	  size_rtx = expand_expr (size, 0, VOIDmode, 0);
+	}
+
+      emit_push_insn (arg->value, TYPE_MODE (TREE_TYPE (pval)),
+		      TREE_TYPE (pval), size_rtx,
+		      TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial,
+		      reg, excess, argblock, ARGS_SIZE_RTX (arg->offset));
+    }
+
+
+  /* Unless this is a partially-in-register argument, the argument is now
+     in the stack. 
+
+     ??? Note that this can change arg->value from arg->stack to
+     arg->stack_slot and it matters when they are not the same.
+     It isn't totally clear that this is correct in all cases.  */
+  if (partial == 0)
+    arg->value = arg->stack_slot;
+
+  /* Once we have pushed something, pops can't safely
+     be deferred during the rest of the arguments.  */
+  NO_DEFER_POP;
+
+  /* ANSI doesn't require a sequence point here,
+     but PCC has one, so this will avoid some problems.  */
+  emit_queue ();
+
+  /* Free any temporary slots made in processing this argument.  */
+  free_temp_slots ();
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+  /* Now mark the segment we just used.  */
+  if (argblock && ! variable_size && arg->stack)
+    for (i = lower_bound; i < upper_bound; i++)
+      stack_usage_map[i] = 1;
+#endif
+}