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coder.c

/*
             Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright
    owned by the United Kingdom Secretary of State for Defence
    acting through the Defence Evaluation and Research Agency
    (DERA).  It is made available to Recipients with a
    royalty-free licence for its use, reproduction, transfer
    to other parties and amendment for any purpose not excluding
    product development provided that any such use et cetera
    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is
        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to
        show both the nature of and the organisation responsible
        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another
        party shall be deemed to be that party's acceptance of
        these conditions;

        (4) DERA gives no warranty or assurance as to its
        quality or suitability for any purpose and DERA accepts
        no liability whatsoever in relation to any use to which
        it may be put.
*/


/* 80x86/coder.c */

/**********************************************************************
$Author: pwe $
$Date: 1998/03/15 16:00:13 $
$Revision: 1.4 $
$Log: coder.c,v $
 * Revision 1.4  1998/03/15  16:00:13  pwe
 * regtrack dwarf dagnostics added
 *
 * Revision 1.3  1998/03/11  11:03:01  pwe
 * DWARF optimisation info
 *
 * Revision 1.2  1998/02/18  11:21:59  pwe
 * test corrections
 *
 * Revision 1.1.1.1  1998/01/17  15:55:51  release
 * First version to be checked into rolling release.
 *
 * Revision 1.49  1997/12/08  16:44:33  pwe
 * make_compound
 *
 * Revision 1.48  1997/12/04  20:00:53  pwe
 * ANDF-DE V1.9
 *
 * Revision 1.47  1997/10/28  10:26:31  pwe
 * correct extra diags / locations
 *
 * Revision 1.46  1997/10/23  09:36:49  pwe
 * extra_diags
 *
 * Revision 1.45  1997/10/10  18:24:55  pwe
 * prep ANDF-DE revision
 *
 * Revision 1.44  1997/08/23  13:45:23  pwe
 * initial ANDF-DE
 *
 * Revision 1.43  1997/04/21  08:31:05  pwe
 * amend reg record at end of scope
 *
 * Revision 1.42  1997/04/17  11:55:34  pwe
 * dwarf2 improvements
 *
 * Revision 1.41  1997/03/20  16:23:29  pwe
 * dwarf2
 *
 * Revision 1.40  1997/02/18  11:42:46  pwe
 * NEWDIAGS for debugging optimised code
 *
 * Revision 1.39  1996/12/13  14:39:13  pwe
 * prep NEWDIAGS
 *
 * Revision 1.38  1996/12/10  15:11:27  pwe
 * prep NEWDIAGS
 *
 * Revision 1.37  1996/11/08  16:18:56  pwe
 * check_stack to check before modifying stack
 *
 * Revision 1.36  1996/10/08  07:58:50  pwe
 * revised correction to env_offset v id out_of_line
 *
 * Revision 1.35  1996/10/07  13:31:00  pwe
 * push make_value, and env_offset v id out_of_line
 *
 * Revision 1.34  1996/07/31  12:56:31  pwe
 * restore alloca stack after longjump
 *
 * Revision 1.33  1996/07/10  15:44:24  pwe
 * visible ptr top (for AVS 3.0)
 *
 * Revision 1.32  1996/05/20  14:30:06  pwe
 * improved 64-bit handling
 *
 * Revision 1.31  1996/05/13  12:51:49  pwe
 * undo premature commit
 *
 * Revision 1.29  1996/03/12  12:44:07  pwe
 * 64-bit ints compatible with gcc long long
 *
 * Revision 1.28  1996/02/20  14:44:55  pwe
 * linux/elf return struct
 *
 * Revision 1.27  1996/01/31  13:02:29  pwe
 * general proc with postlude used in proc parameter position
 *
 * Revision 1.26  1996/01/17  11:24:17  pwe
 * resurrect performance
 *
 * Revision 1.25  1996/01/11  14:02:15  pwe
 * struct return v postludes (again)
 *
 * Revision 1.24  1996/01/10  13:59:42  pwe
 * apply with varcallees within postlude
 *
 * Revision 1.23  1996/01/05  16:25:15  pwe
 * env_size and env_offset within constant expressions
 *
 * Revision 1.22  1995/12/14  16:49:09  pwe
 * postlude with struct result
 *
 * Revision 1.21  1995/11/01  18:41:04  pwe
 * PIC tail_call and exception handling
 *
 * Revision 1.20  1995/10/25  17:41:08  pwe
 * PIC_code current_env and callees
 *
 * Revision 1.19  1995/10/09  15:14:05  pwe
 * dynamic initialisation etc
 *
 * Revision 1.18  1995/09/29  16:17:49  pwe
 * gcc_compatible default on Linux
 *
 * Revision 1.17  1995/09/26  16:46:41  pwe
 * compare with zero to ignore previous overflow
 *
 * Revision 1.16  1995/09/08  12:51:01  pwe
 * exceptions improved
 *
 * Revision 1.15  1995/09/05  16:24:37  pwe
 * specials and exception changes
 *
 * Revision 1.14  1995/09/01  17:29:56  pwe
 * traps and Build scripts
 *
 * Revision 1.13  1995/08/30  16:06:17  pwe
 * prepare exception trapping
 *
 * Revision 1.12  1995/08/23  09:42:27  pwe
 * track fpu control word for trap etc
 *
 * Revision 1.11  1995/08/14  13:53:20  pwe
 * several corrections, tail calls and error jumps
 *
 * Revision 1.10  1995/08/04  08:28:58  pwe
 * 4.0 general procs implemented
 *
 * Revision 1.9  1995/04/13  11:32:16  pwe
 * catch discards with side effects
 *
 * Revision 1.8  1995/03/23  13:25:33  pwe
 * limit scale in deeply nested repeats
 *
 * Revision 1.7  1995/02/27  10:58:52  pwe
 * local_free val_tag offsets treated similar to alloca
 *
 * Revision 1.6  1995/02/23  10:24:13  pwe
 * correction to compare env_offset
 *
 * Revision 1.5  1995/02/22  11:49:14  pwe
 * compare env_offset
 *
 * Revision 1.4  1995/02/01  18:51:13  pwe
 * correct empty make_nof
 *
 * Revision 1.3  1995/01/30  12:56:00  pwe
 * Ownership -> PWE, tidy banners
 *
 * Revision 1.2  1994/11/08  09:00:14  jmf
 * Corrected ncopies - NOT TO COPY
 *
 * Revision 1.1  1994/10/27  14:15:22  jmf
 * Initial revision
 *
 * Revision 1.7  1994/08/19  13:14:15  jmf
 * goto_tag: do final_dest before elimination of redundant jump,
 * so that jump to next; jump L is treated better.
 *
 * Revision 1.6  1994/08/09  11:54:31  jmf
 * alloc_reg: change to refuse reals which are variables.
 *
 * Revision 1.5  1994/08/04  10:22:36  jmf
 * Unon
 * Undone last fix to test and testbit. Changed label_ops
 *
 * Revision 1.4  1994/08/04  09:13:25  jmf
 * test and testbit: only swap labels if there is a single use.
 *
 * Revision 1.3  1994/07/12  15:37:26  jmf
 * Corrected silly synatx error l29
 *
 * Revision 1.2  1994/07/12  15:16:42  jmf
 * Change to align_label(2 in solve
 * Removed is_tester (now in misc_c.c
 *
 * Revision 1.1  1994/07/12  14:28:00  jmf
 * Initial revision
 *
**********************************************************************/


/**********************************************************************

                             coder.c

   coder produces code for expressions. It calls codec to produce code
   for expressions which deliver results, and produces code itself for
   the others.

**********************************************************************/


#include "config.h"
#include <limits.h>
#include "common_types.h"
#include "weights.h"
#include "basicread.h"
#include "tags.h"
#include "codermacs.h"
#include "instr386.h"
#include "expmacs.h"
#include "exp.h"
#include "operand.h"
#include "shapemacs.h"
#include "instr.h"
#include "instrmacs.h"
#include "out.h"
#include "check.h"
#include "flags.h"
#include "codec.h"
#include "xalloc.h"
#include "global_opt.h"
#include "reg_record.h"
#include "externs.h"
#include "install_fns.h"
#include "installglob.h"
#include "machine.h"
#include "localflags.h"
#include "diag_fns.h"
#include "messages_8.h"
#include "assembler.h"
#include "natmacs.h"
#include "label_ops.h"
#include "misc_c.h"
#include "readglob.h"
#include "cproc.h"
#include "coder.h"

#ifdef NEWDIAGS
#include "dg_aux.h"
#include "dg_globs.h"
#endif

#ifdef NEWDWARF
#include "dw2_config.h"
#include "dw2_info.h"
#include "dw2_basic.h"
#include "dw2_extra.h"
#endif


extern exp hasenvoff_list;


/* MACROS */

#define crit_noframe 300

#define align_crit 10000.0



#define noreg 6
#define nobigreg 4
#define nosmallreg 2
#define bigmask1 0x40
#define bigmask1ns 0x8
#define bigmask2 0x30
#define smallmask1 0x2
#define smallmask2 0x6

#define nofl 6
#define nobigfl 3
#define bigflmask 0x1000
#define smallflmask 0x200

/* VARIABLES */
/* All variables initialised */


float scale = (float)1.0;     /* init by cproc */


int  crt_ret_lab; /* init by cproc */
int  crt_ret_lab_used;  /* init by cproc */
int  min_rfree;         /* init by cproc */
int  max_stack;         /* init by cproc */
int  regsinuse;         /* init by cproc */
outofline * odd_bits;   /* init by cproc */
int last_odd_bit;       /* init by cproc */
int doing_odd_bits;     /* init by cproc */
outofline * current_odd_bit;  /* init by cproc */
exp crt_proc_exp; /* init by cproc */

int not_in_params = 1;  /* init by cproc */
int not_in_postlude = 1;      /* init by cproc */
int repeat_level = 0;   /* init by cproc */
int callee_size = 0;    /* init by cproc */
exp vc_pointer;         /* init by cproc */
int has_dy_callees = 0; /* init by cproc */
int has_tail_call = 0;  /* init by cproc */
int has_same_callees = 0;     /* init by cproc */
int need_preserve_stack = 0;  /* init by cproc */
int proc_has_asm = 0;   /* init by cproc */



/* PROCEDURES */

void clean_stack
    PROTO_Z ()
{
  if (no_frame && not_in_params && not_in_postlude && stack_dec != 0)
    stack_return(-stack_dec);
}


/* is this a pushable proc argument ? */
static int push_arg
    PROTO_N ( (e) )
    PROTO_T ( exp e )
{
  shape sha = sh(e);
  unsigned char  n = name (sha);

  if (name(e) == real_tag)
    return 1;

  if (is_floating (n) || n == cpdhd || n == nofhd)
    return 0;

  return (1);
}

static void code_push
    PROTO_N ( (stack, t) )
    PROTO_T ( ash stack X exp t )
{
  int n = (int)name(t);
  if (is_o(n))
    coder (pushdest, stack, t);
  else {
    coder(reg0, stack, t);
    move(sh(t), reg0, pushdest);
  };
  return;
}

/* produce the code for proc params in
   order from last to first */
static void code_pars
    PROTO_N ( (stack, t) )
    PROTO_T ( ash stack X exp t )
{
  int tsize = shape_size(sh(t));
  if (last (t)) {       /* last parameter is pushed first */
    code_push (stack, (name(t)==caller_tag) ? son(t) : t);
    stack_dec -= rounder (tsize, param_align);
  }
  else {
    code_pars (stack, bro (t));/* encode the rest of the parameters */
    code_push (stack, (name(t)==caller_tag) ? son(t) : t);  /* code this parameter */
    stack_dec -= rounder (tsize, param_align);
    /* allow for the size */
  };
}

/* stack parameters ready for apply_proc */
static int procargs
    PROTO_N ( (stack, arg, has_checkstack) )
    PROTO_T ( ash stack X exp arg X int has_checkstack )
{
  int use_push = 1;
  int longs = 0, extra;
  exp t = arg;
  while (t != nilexp) {
    if (name(t)==caller_tag) {
      if (use_push && !push_arg (son(t)))
        use_push = 0;
      no(t) = longs;    /* needed for postlude */
    }
    else {
      if (use_push && !push_arg (t))
        use_push = 0;
    }
    longs = rounder(longs + shape_size(sh(t)), param_align);
    if (last(t))
      break;
    t = bro(t);
  };
  extra = (longs - stack_dec) % stack_align;
  longs += extra;

  if (use_push) {
        /* push instructions can be used. Note that stack_dec is moved
           so that instructions which address positively with respect to
           sp can be changed. */
    if (extra != 0) {
      sub(slongsh, mw(zeroe, extra/8), sp, sp);
      stack_dec -= extra;  /* align stack to param_align */
#ifdef NEWDWARF
      if (diagnose && dwarf2 && no_frame)
      dw2_track_sp();
#endif
    };
    if (arg != nilexp) {
      if (has_checkstack && longs > 160) {
      /* check stack before pushing args if more than 5 words */
      checkalloc_stack (mw (zeroe, longs/8), 0);
      }
      code_pars (stack, arg);
    }
  }
  else {
        /* if push cannot be used, move the stack down first, and then
           assemble the parameters in place. Again, adjust stack_dec. */
    int off = extra;
    if (has_checkstack)
      checkalloc_stack (mw (zeroe, longs/8), 1);
    else
      decstack (longs);
    cond1_set = 0;
    cond2_set = 0;
    stack_dec -= longs;
#ifdef NEWDWARF
    if (diagnose && dwarf2 && no_frame)
      dw2_track_sp();
#endif

    t = arg;
    while (1)
     {
      coder(mw(ind_sp.where_exp, off), stack, (name(t)==caller_tag ? son(t) : t));
      off = rounder(off + shape_size(sh(t)), param_align);
      if (last(t))
        break;
      t = bro(t);
     };
  };
  return longs;
}

/* stack dynamic or same callees */
/* %edx and %ecx don't need to be preserved */
static int push_cees
    PROTO_N ( (src, siz, vc, stack) )
    PROTO_T ( exp src X exp siz X int vc X ash stack )
{
  int old_regsinuse = regsinuse;
  int longs = -1;
  if (siz == nilexp && callee_size >= 0)
    longs = callee_size;
  if (siz != nilexp && name(siz) == val_tag)
    longs = rounder (no(siz), param_align);
  if (longs == 0) {
    if (vc) {
      ins2 (leal, 32, 32, mw(ind_sp.where_exp, longs), reg0);
      ins0 (pusheax);
      stack_dec -= 32;
      return (32);
    }
    return (0);
  }
  if (longs < 0) {
    must_use_bp = 1;    /* scan2 must ensure !no_frame */
    if (siz == nilexp) {
      /* calculate size from calling proc callees */
      outs (" movl 8(%ebp),%eax\n");
      outs (" subl %ebp,%eax\n");
      outs (" subl $12,%eax\n");
    }
    else {
      coder (reg0, stack, siz);
      if (al2(sh(siz)) < param_align) {
      if (al2(sh(siz)) == 1) {
        outs (" addl $31,%eax\n");
        outs (" shrl $3,%eax\n");
      }
      else
        outs (" addl $3,%eax\n");
      outs (" andl $-4,%eax\n");
      }
    }
    ins0 (pusheax);
    stack_dec -= 32;
  }
  if (src == nilexp) {
    if (callee_size >= 0)
      outs (" leal 8(%ebp),%eax\n");
    else
      outs (" leal 12(%ebp),%eax\n");
    }
  else
    coder (reg0, stack, src);
  move (slongsh, reg5, reg1);
  move (slongsh, reg0, reg5);
  if (longs < 0) {
    ins0 (popecx);
    stack_dec += 32;
    if (vc)
      outs (" movl %esp,%eax\n");
    outs (" subl %ecx,%esp\n");
    outs (" shrl $2,%ecx\n");
    if (vc)
      outs (" pushl %eax\n");
  }
  else {
    sub(slongsh, mw(zeroe, longs/8), sp, sp);
    stack_dec -= longs;
    if (vc) {
      ins2 (leal, 32, 32, mw(ind_sp.where_exp, longs), reg0);
      ins0 (pusheax);
      stack_dec -= 32;
    }
    move (slongsh, mw(zeroe, longs/32), reg2);
    if (vc)
      longs += 32;
  }
  move (slongsh, reg4, reg0);
  if (vc)
    outs (" leal 4(%esp),%edi\n");
  else
    outs (" movl %esp,%edi\n");
  outs (" rep\n movsl\n");
  move (slongsh, reg0, reg4);
  move (slongsh, reg1, reg5);
  regsinuse = old_regsinuse;
  invalidate_dest (reg1);
  invalidate_dest (reg2);
  invalidate_dest (reg4);
  invalidate_dest (reg5);
  return longs;
}



/*********************************************************************
   alloc_reg tries to choose registers for a value of shape sha.
   If there is no room, can_do of the result is 0, otherwise 1.
   If it can, ru_regs of result is the registers (as bit pattern)
   and ru_reg_free contains the bit pattern for the registers in use.
   rs is the bit pattern for the registers in use. All the registers must
   be above br (register number as integer, ie 0 for reg0 etc)

 *********************************************************************/
int  bits_in[16] = {          /* number of bits in the index */
  0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
};

/* allocate registers ebx esi edi,
   providing br registers are left */
static regu alloc_reg_big
    PROTO_N ( (rs, sha, br, byteuse) )
    PROTO_T ( int rs X shape sha X int br X int byteuse )
{
  int  sz,
        nr,
        mask,
        i,
        reg_left;       /* number of registers available */
  regu ru;
  int  noshort = 0;
  sz = shape_size(sha);
  if (sz <= 8 || byteuse)
    noshort = 3;
  nr = (sz + 31) / 32;
  reg_left = noreg - noshort - bits_in[rs & 0xf]
             - bits_in[((unsigned int)rs >> 4) & 0x7];


  if ((reg_left) < (br)) {    /* can't allocate */
    ru.can_do = 0;
    return (ru);
  };

  switch (nr) {               /* number of registers needed
                           (consecutive) */
    case 1:
      mask = (noshort == 0) ? bigmask1 : bigmask1ns;
      i = nobigreg - noshort;
      break;
    case 2:
      mask = bigmask2;
      i = nobigreg - 1;
      break;
    default: {
      SET(mask);
      SET(i);
      failer (WRONG_REGSIZE);
    };
  };

  while ((rs & mask) != 0 && i > 0) {
    mask = (int)((unsigned int)mask >> 1);
    --i;
  };

  if (i > 0) {                /* allocate registers */
    min_rfree |= mask;
    ru.can_do = 1;
    ru.ru_regs = mask;
    ru.ru_reg_free = rs | mask;
  }
  else
    ru.can_do = 0;

  return (ru);
}

/* allocate registers ecx edx ebx esi edi
   if at least br registers are available */
static regu alloc_reg_small
    PROTO_N ( (rs, sha, br, byteuse) )
    PROTO_T ( int rs X shape sha X int br X int byteuse )
{
  int  sz,
        nr,
        mask,
        i,
        reg_left;       /* number of registers left */
  regu ru;
  int  noshort = 0;
  sz = shape_size(sha);
  if (sz <= 8 || byteuse)
    noshort = 3;
  nr = (sz + 31) / 32;
  reg_left = noreg - noshort - bits_in[rs & 0xf]
             - bits_in[((unsigned int)rs >> 4) & 0x7];


  if ((reg_left) < (br)) {    /* can't allocate */
    ru.can_do = 0;
    return (ru);
  };

  switch (nr) {               /* number of registers needed
                           (consecutive) */
    case 1:
      mask = smallmask1;
      i = nosmallreg;
      break;
    case 2:
      mask = smallmask2;
      i = nosmallreg - 1;
      break;
    default: {
      SET(mask);
      SET(i);
      failer (WRONG_REGSIZE);
     };
  };

  while ((rs & mask) != 0 && i > 0) {
    mask = (int)((unsigned int)mask << 1);
    --i;
  };

  if (i > 0) {                /* allocate */
    min_rfree |= mask;
    ru.can_do = 1;
    ru.ru_regs = mask;
    ru.ru_reg_free = rs | mask;
    return (ru);
  }
  else
    return alloc_reg_big(rs, sha, br, byteuse);

}


/* allocate floating point registers, if
   at least br are available */
static regu alloc_fl_small
    PROTO_N ( (rs, br) )
    PROTO_T ( int rs X int br )
{
  int  mask,
        i,
        reg_left;
  regu ru;
  reg_left = nofl - bits_in[((unsigned int)rs >> 8) & 0xf] 
            - bits_in[((unsigned int)rs >> 12) & 0xf];


  if ((reg_left) < (br)) {    /* can't allocate */
    ru.can_do = 0;
    return (ru);
  };

  mask = smallflmask;
  i = nofl;

  while ((rs & mask) != 0 && i > 0) {
    mask = (int)((unsigned int)mask << 1);
    --i;
  };

  if (i > 0) {                /* allocate */
    ru.can_do = 1;
    ru.ru_regs = mask;
    ru.ru_reg_free = rs | mask;
  }
  else
    ru.can_do = 0;            /* can't allocate */

  return (ru);
}

/* allocate all registers */
static regu alloc_reg
    PROTO_N ( (rs, sha, br, big_reg, e) )
    PROTO_T ( int rs X shape sha X int br X int big_reg X exp e )
{
  if (name (sha) >= shrealhd && name (sha) <= doublehd) {
#ifdef NEWDIAGS
    if (big_reg || diag_visible || round_after_flop ||
#else
    if (big_reg || diagnose || round_after_flop ||
#endif
      (is80586 && isvar(e))) {
      regu ru;
      ru.can_do = 0;
      return (ru);
    }
    else
      return (alloc_fl_small (rs, br));
  };
  if (big_reg)
    return (alloc_reg_big (rs, sha, br, isbyteuse(e)));
  else
    return (alloc_reg_small (rs, sha, br, isbyteuse(e)));
}


/************************************************************************
   def_where choose where to put a declaration. e is the declaration.
   def is the definition (for identity) or initialisation (for variable).
   stack is the ash for the current stack position. The alignment for the
   stack on the 80386 for the cc implementation is always 32 bits, but it
   might not be on other implementations.
   The dcl returned gives
     dcl_pl - code for where value is (eg reg_pl for registers). These
              codes are defined in codermacs.h
     dcl_n  - the offset (in bits) where the value starts if it is on the
              stack.
              the bit pattern for the registers if it is in registers.
     dcl_place - the ash for the stack after the allocation. This will
              be the same as stack if the allocation is in registers.
     dcl_new - 1 if this is a new declaration. 0 if it renaming an
              existing value, and the old one is being reused.

 ************************************************************************/


static dcl alloc_regable
    PROTO_N ( (dc, def, e, big_reg) )
    PROTO_T ( dcl dc X exp def X exp e X int big_reg )
{
  where alt;
  int defsize = shape_size(sh(def));
  regu ru;
  alt = equiv_reg (mw (def, 0), defsize);

  if (alt.where_exp != nilexp) {
    int  mask = no (son (alt.where_exp));
    if (mask != 1 && (!big_reg || mask >= 0x8)) {
      if ((mask & regsinuse) != 0 && !isvar (e) &&
        (defsize > 8 || mask < 0x10)) {
      if (no_side (bro (son (e)))) {
        dc.dcl_pl = reg_pl;
        dc.dcl_n = mask;
        dc.dcl_new = 0;
        return (dc);
      };
      };
    };
  };


  if (ru = alloc_reg (regsinuse, sh (def), no (e), big_reg, e),
      ru.can_do) {
    if (alt.where_exp != nilexp) {
      int  mask = no (son (alt.where_exp));
      if (mask != 1 && (!big_reg || mask >= 0x8)) {
      if ((mask & regsinuse) == 0 &&
          (defsize > 8 || mask < 0x10)) {
        dc.dcl_pl = reg_pl;
        dc.dcl_n = mask;
        return (dc);
      };
      };
    };

    dc.dcl_pl = reg_pl;
    dc.dcl_n = ru.ru_regs;
    return (dc);
  };
  dc.dcl_pl = 0;
  return (dc);
}

static dcl def_where
    PROTO_N ( (e, def, stack) )
    PROTO_T ( exp e X exp def X ash stack )
{
  int big_reg = has_intnl_call(e);
  dcl dc;
  ash locash;
  exp body = bro (def);
  dc.dcl_place = stack;
  dc.dcl_new = 1;


  if (name (sh (def)) == tophd && !isvis(e)) {
    dc.dcl_pl = nowhere_pl;
    dc.dcl_n = 0;
    return (dc);
  };

  if (name(def) == name_tag && !isvar(son(def)) &&
        no(def) == 0 && isloadparam(def)) {
    if (regable (e) && (name(son(son(def)))==formal_callee_tag ?
                   !has_same_callees : !has_tail_call)) {
      dcl ndc;
      ndc = alloc_regable (dc, def, e, big_reg);
      if (ndc.dcl_pl != 0)          /* local copy of arg in register */
        return (ndc);
    };
    dc.dcl_pl = ptno (son (def));
    dc.dcl_n = no (son (def));
    dc.dcl_new = 0;
    return dc;
  };


  if (!isvar (e) &&
      ((name (def) == name_tag && !isvar (son (def)) &&
        (!isglob (son (def)))
      ) ||
      (name (def) == cont_tag && name (son (def)) == name_tag &&
        isvar (son (son (def))) &&
        (!isglob (son (son (def)))) &&

        no_side(body)))) {
    /* either we are identifying something already identified or the
       contents of a variable which is not altered by the body of the
       definition */
    if (name (def) == name_tag) {
      dc.dcl_pl = ptno (son (def));
      dc.dcl_n = no (son (def)) + no (def);
    }
    else {
      dc.dcl_pl = ptno (son (son (def)));
      dc.dcl_n = no (son (son (def))) + no (son (def));
    };
    /* we have the declaration */

    if (dc.dcl_pl == reg_pl) {      /* if the old one was in registers, reuse
                           it. */
      dc.dcl_new = 0;
      return (dc);
    };

    if (regable (e)) {
      dcl ndc;
      ndc = alloc_regable (dc, def, e, big_reg);
      if (ndc.dcl_pl != 0)
        return (ndc);
    };

    dc.dcl_new = 0;           /* if there was not room, reuse the old
                           dec */
    return (dc);

  };

  /* try to allocate in registers, except when narrowing fp variety */
  if (regable (e) &&
      (name(def) != chfl_tag || name(sh(def)) >= name(sh(son(def))))) {
    dcl ndc;
    ndc = alloc_regable (dc, def, e, big_reg);
    if (ndc.dcl_pl != 0)
      return (ndc);
  };


  /* otherwise allocate on the stack */

  {
    int a = 32;
    shape s = sh(def);
    if (stack_aligned_8byte && (name(s) == realhd ||
                  (name(s) == nofhd && ptno(s) == realhd)))
      a = 64;

    locash.ashalign = 32;
    dc.dcl_n = rounder(stack.ashsize, a);

    locash.ashsize = dc.dcl_n + shape_size(sh(def));

    dc.dcl_place = locash;
    dc.dcl_pl = local_pl;
    return (dc);
  };

}

/***********************************************************************
   solve produces the code for the solve construction.
    s is the whole list of braches
    l is the branches of which the label record have not been created.
    dest is the destination for the value produced by each branch
    jr is the jump record for the end of the construction.
    stack is the initial stack ash
 ***********************************************************************/


static void solve
    PROTO_N ( (s, l, dest, jr, stack) )
    PROTO_T ( exp s X exp l X where dest X exp jr X ash stack )
{
  while (!last (l)) {         /* not the last branch */
    exp record = getexp (f_bottom, nilexp,
        (bool)(props (son (bro (l))) & 2),
        nilexp,
      nilexp, 0, 0, 0);
    sonno(record) = stack_dec;
    ptno(record) = next_lab();
    fstack_pos_of(record) = (prop)fstack_pos;   /* CAST:jmf: */
    /* record the floating point stack position, fstack_pos */
    /* record is jump record for the label */
    pt (son (bro (l))) = record;/* put it away */
    l = bro (l);
  };

  {
    int  r1 = regsinuse;      /* record regsinuse for the start of each
                           branch and for the end. */
    exp t;
    if (name (s) != goto_tag || pt (s) != bro (s))
      coder (dest, stack, s); /* code the starting exp */
#ifdef NEWDIAGS
    else
      diag_arg (dest, stack, s);
#endif
    reset_fpucon();
    t = s;
    do {
      regsinuse = r1;
      if (name (sh (t)) != bothd) {
      jump (jr, in_fstack (dest.where_exp));
      };
      /* only put in jump if needed */
      t = bro (t);
      align_label(2, pt (son (t)));
      set_label (pt (son (t)));
      coder (dest, stack, t);
      reset_fpucon();
    }
    while (!last (t));
    regsinuse = r1;
    return;
  }
}

/**************************************************************************
   caser produces the code for the case construction e, putting the
   result into dest.
 *************************************************************************/

static void caser
    PROTO_N ( (arg, exhaustive, case_exp) )
    PROTO_T ( exp arg X int exhaustive X exp case_exp )
{
  exp t = arg;
  int  n;
  int i;
  int *v;
  int  sz;
  int min;
  int max;

  min=no(bro(arg));
  do
  {
    t=bro(t);
  }
  while (bro(t)!=nilexp);
  max=((son(t)==nilexp) ? no(t) : no(son(t)));


  /* prepare to use jump table */
  v = (int *) xcalloc (max - min + 1, sizeof (int));
  for (i = 0; i < (max - min + 1); ++i)
    v[i] = -1;
  t = arg;
  do {
    exp lab;
    t = bro (t);
    lab = final_dest(pt(t));
    n = ptno (pt (son (lab)));
    for (i = no (t);
      i <= ((son (t) == nilexp) ? no (t) : no (son (t)));
      ++i)
      v[i - min] = n;
  }
  while (bro (t) != nilexp);

  switch (name (sh (arg))) EXHAUSTIVE {
    case scharhd:
    case ucharhd:
      sz = 8;
      break;
    case swordhd:
    case uwordhd:
      sz = 16;
      break;
    case slonghd:
    case ulonghd:
      sz = 32;
      break;
  };

  caseins (sz, arg, min, max,v, exhaustive, 0 , case_exp);
            /* put in jump table */
  return;
}


/********************************************************************
   coder produces code for all constructions. It uses codec to
   produce the code for the non side-effecting constructions. e is
   the construction to be processed, dest is where the result is to go,
   stack is the ash for the current stack.
 ********************************************************************/

static ash stack_room
    PROTO_N ( (stack, dest, off) )
    PROTO_T ( ash stack X where dest X int off )
{
  if (name(dest.where_exp) == ident_tag)
   {
     if (ptno(dest.where_exp) != local_pl)
       return stack;
     if ((no(dest.where_exp) + off) > stack.ashsize)
       stack.ashsize = no(dest.where_exp) + off;
   };

  return stack;
}



#ifdef NEWDIAGS
static void coder1
#else
void coder
#endif
    PROTO_N ( (dest, stack, e) )
    PROTO_T ( where dest X ash stack X exp e )
{
  float old_scale;
  switch (name (e)) {
    case ident_tag:
      {
      exp def = son (e);
      exp body = bro (def);
      int  sz;
      dcl dc;
      int  old_fstack_pos;
      if (isinlined(e) && dest.where_off == 0 &&
            name(dest.where_exp) == ident_tag &&
            (!has_intnl_call(e) || ptno(dest.where_exp) != reg_pl ||
               (no(dest.where_exp) > 4 && no(dest.where_exp) < smallflmask))) {
        dc.dcl_pl = ptno(dest.where_exp);
        dc.dcl_n = no(dest.where_exp);
        dc.dcl_place.ashsize = stack.ashsize + shape_size(sh(def));
        dc.dcl_place.ashalign = 32;
        dc.dcl_new = 1;
      }
      else
        dc = def_where (e, def, stack);/* allocate space */

      sz = (dc.dcl_place).ashsize;


      ptno (e) = dc.dcl_pl;   /* record the allocation in pt and no for
                           when the value is used. */
      no (e) = dc.dcl_n;

      if (ptno (e) == reg_pl && name (sh (def)) >= shrealhd &&
          name (sh (def)) <= doublehd) {
        /* if the value being defined is going in the floating point
           registers, record the floating point stack level, so that we
           can ensure that it is the same at the end of the construction
           */
        old_fstack_pos = fstack_pos;
      };

        if (isenvoff(e)) {
          set_env_off(-dc.dcl_n, e);
        };

      if (dc.dcl_new) { /* if it is new we must evaluate the def
                        */
        if (ptno (e) == nowhere_pl)
          coder (zero, stack, def);/* discard the value */
        else
           {
          coder (mw (e, 0), stack, def);
           };

        if (ptno (e) == reg_pl) {
          /* modify regsinuse if a register is being used */
          regsinuse |= dc.dcl_n;
        };
        if (ptno (e) == local_pl) {
          /* modify max_stack if the stack is being used */
          if (sz > max_stack)
            max_stack = sz;
        };
      };

      coder (dest, dc.dcl_place, body);/* code the body */

      if (dc.dcl_new && ptno (e) == reg_pl) {
        regsinuse &= ~dc.dcl_n;/* restore regsinuse. It is done by
                           removing the bits of this allocation,
                           rather than restoring the old value, so
                           that allocation and restoration need
                           not nest */
        if (name (sh (def)) >= shrealhd && name (sh (def)) <= doublehd &&
            fstack_pos != (SET(old_fstack_pos) old_fstack_pos) &&
            ptno (e) == reg_pl &&
            name (sh (e)) != bothd) {
          /* restore the floating point registers if necessary */

          if (ptno (e) == reg_pl &&
            !in_fstack (dest.where_exp)) {
            int   rn = get_reg_no (no (e));
            if (rn == fstack_pos)
            discard_fstack ();
            else {
            if (rn < fstack_pos)
              discard_st1 ();
            };
          };
        };
      };

      if (dc.dcl_new && ptno (e) == local_pl) {
        exp temp = getexp (f_top, nilexp, 1, e, nilexp, 0, 0, name_tag);
        if (isvar(e))
          temp = getexp (f_top, nilexp, 1, temp, nilexp, 0, 0, cont_tag);
        invalidate_dest ( mw ( temp, 0 ) );
        if (isvar(e))
          retcell (son(temp));
        retcell (temp);
      }

      if (isenvoff(e)) {      /* prepare for possible later constant evaluation */
        hasenvoff_list = getexp (f_bottom, hasenvoff_list, 0, e, nilexp, 0, 0, 0);
      }

      return;
      };
    case seq_tag:
      {
      exp t = son (son (e));
      int no_bottom;
      while (coder (zero, stack, t),
      /* code and discard the statements */
          no_bottom = (name (sh (t)) != bothd),
          !last (t))
        t = bro (t);
      if (no_bottom)
        coder (dest, stack, bro (son (e)));
#ifdef NEWDIAGS
      else
      if (diagnose) {               /* Beware lost information !!! */
        name(bro(son(e))) = top_tag;
        son(bro(son(e))) = nilexp;
        dgf(bro(son(e))) = nildiag;
      }
#endif
      return;
      };
    case cond_tag:
      {
      int  old_fstack_pos = fstack_pos;
      exp first = son (e);
      exp alt = bro (first);
      exp record; /* jump record for alt */
      int  r1;
      exp jr = nilexp;/* jump record for end of construction */

      if ( no(son(alt)) == 0) {
        coder(dest, stack, first);
#ifdef NEWDIAGS
        if (diagnose) {       /* Beware lost information !!! */
          name(bro(son(alt))) = top_tag;
          son(bro(son(alt))) = nilexp;
          dgf(bro(son(alt))) = nildiag;
        }
#endif
        return;
      };

      clean_stack();


      record = getexp (f_bottom, nilexp, 0,
            nilexp, nilexp,
            0, 0, 0);
        sonno(record) = stack_dec;
        fstack_pos_of(record) = (prop)fstack_pos;
      if (pt(son(alt)) != nilexp)
          ptno(record) = ptno(pt(son(alt)));
      else
            ptno(record) = next_lab();


      if (name(bro(son(alt))) == top_tag && stack_dec == 0 && !is_loaded_lv(alt))  {
        int extract = take_out_of_line(first, alt, repeat_level > 0, scale);

        if (extract) {
          exp t = son(son(first));
          exp p, s, z;
          int test_n;
          shape sha;
          outofline * rec;
          exp tst = (is_tester(t, 0)) ? t : bro(son(t));
            jr = getexp (f_bottom, nilexp, 0, nilexp, nilexp, 0,
              0, 0);
              sonno(jr) = stack_dec;
              ptno(jr) = next_lab();
              fstack_pos_of(jr) = (prop)fstack_pos;
          sha = sh(son(tst));
          rec = (outofline*)xmalloc(sizeof(outofline));
          rec->next = odd_bits;
          odd_bits = rec;
          rec->dest = dest;
          rec->stack = stack;
          rec->regsinuse = regsinuse;
          rec->fstack_pos = fstack_pos;
          rec->labno = next_lab();  /* number for outofline bit */
          rec->repeat_level = repeat_level;
          rec->scale = (float)0.5 * scale;
          rec->jr = jr; /* jump record for return from bit */

          if (last(t))
            first = bro(son(first));
          else
            son(son(first)) = bro(son(son(first)));

          rec->body = first;
          pt (son (alt)) = record;

          test_n = (int)test_number(tst);
          if (name(sha) < shrealhd || name(sha) > doublehd)
            test_n = (int)int_inverse_ntest[test_n];
          else
            test_n = (int)real_inverse_ntest[test_n];

          settest_number(tst, test_n);
          z = getexp (f_bottom, nilexp, 0, nilexp, nilexp, 0, 0, 0);
          sonno(z) = stack_dec;
          fstack_pos_of(z) = (prop)fstack_pos;
          ptno(z) = rec->labno;
          s = getexp(sha, nilexp, 0, nilexp, z, 0, 0, 0);
          p = getexp(sha, tst, 0, s, nilexp, 0, 0, 0);
          pt(tst) = p;
          coder(zero, stack, t);
          if (name(sh(first)) != bothd) {
            reset_fpucon();
            set_label(jr);
#ifdef NEWDWARF
            START_BB ();
#endif
            clear_reg_record(crt_reg_record);
          };

          rec->cond1_set = cond1_set;
          rec->cond2_set = cond2_set;
          rec->cond1 = cond1;
          rec->cond2a = cond2a;
          rec->cond2b = cond2b;
#if 0
#ifdef NEWDWARF
          if (dwarf2) {
            rec->dw2_hi = next_dwarf_label();
            rec->dw2_slave = next_dwarf_label();
            dw2_extend_scope (rec->labno, rec->dw2_hi, rec->dw2_slave);
          }
#endif
#endif
          return;
        };
      };

        old_scale = scale;
        scale = (float)0.5*scale;

      /* record floating point stack position so that we can align the
         positions */
      /* jump record set up for alt */
      pt (son (alt)) = record;
      /* set the record in for use by jumps in first. */

      r1 = regsinuse;         /* regsinuse is the same at the start of
                           first and alt, and at the end of the
                           construction. */
      coder (dest, stack, first);
      reset_fpucon();
      clean_stack();

      regsinuse = r1;         /* restore regsinuse for alt */

      if (name (bro (son (alt))) == top_tag && !is_loaded_lv(alt)) {
        /* if alt is only load top, do nothing but set the label */
        if (name(sh(first)) == bothd && no(son(alt)) != 0)
          align_label(2, record);

        if (name(first) == seq_tag &&
              name(bro(son(first))) == seq_tag &&
              name(bro(son(bro(son(first))))) == apply_tag)
          align_label(0, record);
        set_label (record);
#ifdef NEWDWARF
        START_BB ();
#endif
        fstack_pos = old_fstack_pos;
        clear_reg_record (crt_reg_record);
          scale = old_scale;
        return;
      };

      if (name (sh (first)) != bothd &&
            (no(son(alt)) != 0 || name(bro(son(alt))) != goto_tag)) {
        /* if the first did not end with jump or ret, put in a jump to
           the end of the construction, and make a jump record for it */
          jr = getexp (f_bottom, nilexp, 0, nilexp, nilexp, 0,
              0, 0);
            sonno(jr) = stack_dec;
            ptno(jr) = next_lab();
            fstack_pos_of(jr) = (prop)fstack_pos;
        jump (jr, in_fstack (dest.where_exp));
      };

      if (no(son(alt)) != 0 || name(bro(son(alt))) != goto_tag) {
      if (no(son(alt)) != 0)
          align_label(2, record);
      set_label (record);     /* the label for the start of alt */
      fstack_pos = old_fstack_pos;
      coder (dest, stack, alt);
      reset_fpucon();
      regsinuse = r1;         /* restore regsinuse for end of
                           construction */
      if (name (sh (first)) != bothd) {
        /* set the label for the end of the construction if first needed
           it. */
        SET(jr);
        if (name(sh(alt)) == bothd)
          align_label(2, jr);
        set_label (jr);
#ifdef NEWDWARF
        START_BB ();
#endif
      };
      };
      cond1_set = 0;
      cond2_set = 0;          /* we don't know what condition flags are
                           set */
        scale = old_scale;
      return;
      };
    case labst_tag:           /* code a labelled statement */
      {
      clear_reg_record (crt_reg_record);
      cond1_set = 0;
      cond2_set = 0;
      fpucon = normal_fpucon;

        if (is_loaded_lv(e)) {
        set_lv_label(e);
        if (need_preserve_stack)
          restore_stack ();
        else if (!has_alloca)
            set_stack_from_bp();
      };
        fstack_pos = (int)fstack_pos_of(pt(son(e)));
        stack_dec = sonno(pt(son(e)));

        old_scale = scale;
#ifdef NEWDWARF
      START_BB ();
#endif
      coder (dest, stack, bro (son (e)));
        scale = old_scale;

      clear_reg_record (crt_reg_record);
      clean_stack();
      return;
      };
    case rep_tag:
      {
      exp start = son (e);
      exp body = bro (start);
      exp record;       /* jump record for loop label */
        ++repeat_level;
      coder (mw (body, 0), stack, start);
      /* code the starter of the loop */
      reset_fpucon();
      clean_stack();
      record = getexp (f_bottom, nilexp, 1, nilexp,
          nilexp, 0, 0, 0);
        sonno(record) = stack_dec;
        ptno(record) = next_lab();
        fstack_pos_of(record) = (prop)fstack_pos;
      cond1_set = 0;
      cond2_set = 0;
        align_label(1, record);
      set_label (record);     /* set the label at the start of body */
      pt (son (body)) = record;
        old_scale = scale;
        if (scale < 1e30)
            scale = (float)20.0 * scale;
      coder (dest, stack, body);
        scale = old_scale;
        --repeat_level;
      return;
      };
    case prof_tag:
      scale = (float)no(e);
      return;
    case goto_tag:
      {
      exp lab;
        clean_stack();
      lab = final_dest(pt(e));
#ifdef NEWDWARF
      if (current_dg_info) {
        current_dg_info->data.i_tst.brk = set_dw_text_label ();
        current_dg_info->data.i_tst.jlab.u.l = ptno(pt (son (lab)));
        current_dg_info->data.i_tst.jlab.k = LAB_CODE;
      }
#endif
      if (label_is_next(lab, e)) {
        int  fs_dest = (int)fstack_pos_of (pt (son (lab)));
        int  good_fs = fstack_pos;
        while (fstack_pos > fs_dest)
          discard_fstack ();
        reset_fpucon();
        fstack_pos = good_fs;
        return;
      };
      jump (pt (son (lab)), 0);
      return;
      };
    case goto_lv_tag:
      {
      clean_stack();
      reset_fpucon();
        jumpins(son(e));
        return;
      };
    case long_jump_tag:
      {
      coder (pushdest, stack, bro(son(e)));
      extra_stack += 32;
      coder (pushdest, stack, son(e));
      extra_stack += 32;
      check_stack_max;
      reset_fpucon();
      long_jump(e);
      extra_stack -= 64;
      return;
      };
    case testbit_tag:
      {                       /* not more than one argument will not be
                           a possible 80386 operand */
      exp lab = pt(e);
      exp temp;
      ntest testno = test_number(e);
      int isret = 0;

      if (name(lab) == labst_tag) {
        exp q = short_next_jump(e);
        if (q != nilexp &&
            (name(q) == goto_tag ||
               (name(q) == res_tag && name(son(q)) == top_tag)) &&
            label_is_next(lab, q)) {
          shape sha = sh(son(e));
          if (name(q) == goto_tag) {
            temp = pt(q);
            pt(q) = lab;
          }
          else {
              temp = getexp (f_bottom, nilexp, 0, nilexp,
                                nilexp, 0, 0, 0);
            ptno(temp) = crt_ret_lab;
            fstack_pos_of(temp) = (prop)first_fl_reg;
            temp = getexp(f_top, nilexp, 0, nilexp, temp,
                         0, 0, 0);
            temp = getexp(f_top, lab, 0, temp, nilexp,
                         0, 0, labst_tag);
            crt_ret_lab_used = 1;
            pt(q) = lab;
            name(q) = goto_tag;
            isret = 1;
          };
          lab = temp;
          pt(e) = lab;
          if (name(sha) < shrealhd || name(sha) > doublehd)
            settest_number(e, (int)int_inverse_ntest[testno]);
          else
            settest_number(e, (int)real_inverse_ntest[testno]);
#ifdef NEWDIAGS
          if (current_dg_info)
            current_dg_info->data.i_tst.inv = 1 - current_dg_info->data.i_tst.inv;
#endif
        };
        };
      if (!isret)
        temp = final_dest_test(lab, e);
      SET(temp);
      if (pt(son(temp)) == nilexp) {
        ++no(son(temp));
        pt(son(temp)) = copyexp(pt(son(lab)));
        ptno(pt(son(temp))) = next_lab();
      }
      else
      if (temp != lab) {
        --no(son(lab));
        ++no(son(temp));
      };
      pt(e) = temp;
       {
      where qw;
      exp lab_exp = pt (e);
      exp jr = pt (son (lab_exp));
      exp arg1 = son (e);
      exp arg2 = bro (arg1);
      if (!is_o (name (arg1)) || is_crc(arg1)) {
        /* arg1 is not a possible 80386 operand, precompute it in reg0
        */
        qw.where_exp = copyexp (reg0.where_exp);
        sh (qw.where_exp) = sh (arg1);
        qw.where_off = 0;
        coder (qw, stack, arg1);
        arg1 = qw.where_exp;
      };
      if (!is_o (name (arg2)) || is_crc(arg2)) {
        /* arg2 is not a possible 80386 operand, precompute it in reg0
        */
        qw.where_exp = copyexp (reg0.where_exp);
        sh (qw.where_exp) = sh (arg2);
        qw.where_off = 0;
        coder (qw, stack, arg2);
        arg2 = qw.where_exp;
      };

      clean_stack();
#ifdef NEWDWARF
      if (current_dg_info) {
        current_dg_info->data.i_tst.brk = set_dw_text_label ();
        current_dg_info->data.i_tst.jlab.u.l = ptno(jr);
        current_dg_info->data.i_tst.jlab.k = LAB_CODE;
      }
#endif
      test (sh (arg1), mw (arg1, 0), mw (arg2, 0));
      branch ((int)test_number(e), jr, 1, (int)name(sh(arg1)));
#ifdef NEWDWARF
      START_BB ();
      if (current_dg_info)
        current_dg_info->data.i_tst.cont = set_dw_text_label ();
#endif
      return;
       };
      };
    case absbool_tag:
    case test_tag:
      {                       /* not more than one argument will not be
                           a possible 80386 operand */
      exp lab = pt(e);
      exp temp;
      ntest testno = test_number(e);
      int isret = 0;
      exp original_lab = lab;       /* preserve for extra_diags */

      if (name(e) == test_tag) {
        if (name(lab) == labst_tag) {
          exp q = short_next_jump(e);
          if (q != nilexp &&
              (name(q) == goto_tag ||
                 (name(q) == res_tag && name(son(q)) == top_tag)) &&
              label_is_next(lab, q)) {
            shape sha = sh(son(e));
            if (name(q) == goto_tag) {
              temp = pt(q);
              pt(q) = lab;
            }
            else {
                temp = getexp (f_bottom, nilexp, 0, nilexp,
                                nilexp, 0, 0, 0);
            ptno(temp) = crt_ret_lab;
            fstack_pos_of(temp) = (prop)first_fl_reg;
              temp = getexp(f_top, nilexp, 0, nilexp, temp,
                         0, 0, 0);
              temp = getexp(f_top, lab, 0, temp, nilexp,
                         0, 0, labst_tag);
            crt_ret_lab_used = 1;
              pt(q) = lab;
              name(q) = goto_tag;
              isret = 1;
            };
            lab = temp;
            pt(e) = lab;
            if (name(sha) < shrealhd || name(sha) > doublehd)
              settest_number(e, (int)int_inverse_ntest[testno]);
            else
              settest_number(e, (int)real_inverse_ntest[testno]);
#ifdef NEWDIAGS
            if (current_dg_info)
            current_dg_info->data.i_tst.inv = 1 - current_dg_info->data.i_tst.inv;
#endif
          };
          };
        if (!isret)
          temp = final_dest_test(lab, e);
        SET(temp);
        if (pt(son(temp)) == nilexp) {
          ++no(son(temp));
          pt(son(temp)) = copyexp(pt(son(lab)));
          ptno(pt(son(temp))) = next_lab();
        }
        else
        if (temp != lab) {
          --no(son(lab));
          ++no(son(temp));
        };
        pt(e) = temp;
      };
      {
        where qw;
        exp arg1 = son (e);
        exp arg2 = bro (arg1);
        unsigned char  test_n = test_number (e);
        exp lab_exp = pt (e);
        exp jr;
        int sg;
        if (name(e)==test_tag)
          jr = pt (son (lab_exp));
        if (!is_o (name (arg1)) || is_crc(arg1)) {
          /* arg1 is not a possible 80386 operand, precompute it in reg0
             */
          qw.where_exp = copyexp (reg0.where_exp);
          sh (qw.where_exp) = sh (arg1);
          qw.where_off = 0;
          coder (qw, stack, arg1);
          arg1 = qw.where_exp;
        }
#ifdef NEWDIAGS
        else
          diag_arg (dest, stack, arg1);
#endif
        if (!is_o (name (arg2)) || is_crc(arg2)) {
          /* arg2 is not a possible 80386 operand, precompute it in reg0
             */
          qw.where_exp = copyexp (reg0.where_exp);
          sh (qw.where_exp) = sh (arg2);
          qw.where_off = 0;
          coder (qw, stack, arg2);
          arg2 = qw.where_exp;
        }
#ifdef NEWDIAGS
        else
          diag_arg (dest, stack, arg2);
#endif

        switch (name (sh (arg1))) {
          case scharhd:
          case swordhd:
          case slonghd:
          case offsethd:
            sg = 1;
            break;
          case ucharhd:
          case uwordhd:
          case ulonghd:
          case shrealhd:
          case realhd:
          case doublehd:
          case ptrhd:
            sg = 0;
            break;
          default:
            sg = is_signed(sh(arg1));
            break;
        };

        if (name (arg1) == val_tag || name (arg1) == env_offset_tag ||
            (name (arg1) == name_tag && isvar(son(arg1)) && isglob(son(arg1)) )) {
            /* if only one constant, cmp expects it to be arg2 */
          exp holde = arg1;
          arg1 = arg2;
          arg2 = holde;
          test_n = exchange_ntest[test_n];
#ifdef NEWDIAGS
          if (current_dg_info)
            current_dg_info->data.i_tst.inv = 1 - current_dg_info->data.i_tst.inv;
#endif
        };

        if (name (arg1) == null_tag) {
          failer("test_tag of wrong form");
        }
        else {
          clean_stack();
          if (name(e) == absbool_tag && sg &&
            (test_n == f_greater_than || test_n == f_less_than_or_equal)) {
            cond1_set = 0;    /* avoid cmp(0) optimisation to clear overflow */
          }
          if (cmp (sh (arg1), mw (arg1, 0), mw (arg2, 0), (int)test_n, e)) {
            if (sg) {
            sg = -1;   /* ignore overflow when testing sign bit */
            }
          }
          if (name(e) == test_tag) {
            SET(jr);
#ifdef NEWDWARF
            if (current_dg_info) {
            current_dg_info->data.i_tst.brk = set_dw_text_label ();
            current_dg_info->data.i_tst.jlab.u.l = ptno(jr);
            current_dg_info->data.i_tst.jlab.k = LAB_CODE;
            }
#endif
            branch ((int)test_n, jr, sg, (int)name(sh(arg1)));
#ifdef NEWDWARF
            START_BB ();
            if (current_dg_info)
              current_dg_info->data.i_tst.cont = set_dw_text_label ();
#endif
          }
          else
          if (!eq_where (dest, zero)) {
            setcc((int)int_inverse_ntest[test_n], sg,
                   (int)name(sh(arg1)));
            if (shape_size(sh(e)) > 8)
              and(slongsh, reg0, mw(zeroe, 0xff), reg0);
            move(sh(e), reg0, dest);
          };
        };
        pt(e) = original_lab;       /* may be needed for extra_diags */
        return;
      };
      };
    case ass_tag:
    case assvol_tag:
      {
      exp assdest = son (e);
      exp assval = bro (assdest);

        if (!newcode && name(sh(assval)) == bitfhd)
         {
           bits_to_mem(assval, e, stack);
           return;
         };

      coder (mw(e, 0), stack, assval);
      /* set the destination and code the rest */
      return;
      };
    case concatnof_tag:
     {
      int off = dest.where_off + shape_size(sh(son(e)));
      coder(dest, stack, son(e));
      coder(mw(dest.where_exp, off),
             stack_room(stack, dest, off), bro(son(e)));
      return;
     };
    case ncopies_tag:
     {
       int i;
       int sz;
       int off;
       if (no(e) == 0)
         return;

       sz = shape_size(sh(e))/no(e);
       for (i = 0; i < no(e); ++i)
        {
          off = dest.where_off + i*sz;
          coder(mw(dest.where_exp, off),
                stack_room(stack, dest, off), copyexp(son(e)));
        };
       return;
      };
    case nof_tag:
      {
        exp v = son(e);
        shape sha;
        int off;
        int crt = 0;

        if (v == nilexp)
          return;

        sha = sh(v);
        off = rounder(shape_size(sha), shape_align(sha));

        while (1)
         {
           coder(mw(dest.where_exp, dest.where_off + crt),
                 stack_room(stack, dest, dest.where_off + crt), v);
           if (last(v))
             return;
           crt += off;
           v = bro(v);
         };
      };
    case compound_tag:
      {
        exp v = son(e);
        if (v == nilexp)
          return;

        while (1)
         {
           coder(mw(dest.where_exp, dest.where_off + no(v)),
                 stack_room(stack, dest, dest.where_off + no(v)), bro(v));
           if (last(bro(v)))
             return;
           v = bro(bro(v));
         };
      };
    case apply_tag:
    case apply_general_tag:
      {
      exp proc = son (e);
      exp arg = (!last(proc)) ? bro (proc) : nilexp;
      exp cees = nilexp;
      exp postlude = nilexp;
      int untidy_call = 0;
      int has_checkstack = 0;
      int  longs, more_longs, old_regsinuse, prev_use_bp;
      int multi_reg = (shape_size(sh(e)) > 32 && reg_result(sh(e))
                         && !is_floating(name(sh(e))));
      int old_nip = not_in_params;
      int push_result = 0;
      int post_offset = 0;
      int ret_stack_dec;

      if (builtinproc(e)) {
        dec* dp = brog (son(proc));
        char *id = dp -> dec_u.dec_val.dec_id;
        special_ins (id + prefix_length, arg, dest);
        return;
      }

      if (name(e)==apply_general_tag) {
        arg = son(arg);
        cees = bro(bro(proc));
        if (name(bro(cees)) != top_tag)
          postlude = bro(cees);
        untidy_call = call_is_untidy(e);
        has_checkstack = call_has_checkstack(e);
      }

      not_in_params = 0;
      longs = procargs (stack, arg, has_checkstack);
      ret_stack_dec = stack_dec;

      prev_use_bp = must_use_bp;    /* may be altered by push_cees */
      if (cees == nilexp)
        more_longs = 0;
      else {
        switch (name(cees)) {
          case make_callee_list_tag:
            {
            more_longs = procargs (stack, son(cees), has_checkstack);
            if (call_has_vcallees(cees)) {
              ins2 (leal, 32, 32, mw(ind_sp.where_exp, more_longs), reg0);
              ins0 (pusheax);
              stack_dec -= 32;
              more_longs += 32;
            }
            break;
            }
          case make_dynamic_callee_tag:
            {
            exp ptr = son(cees);
            exp siz = bro(ptr);
            more_longs = push_cees (ptr, siz, call_has_vcallees(cees), stack);
            break;
            }
          case same_callees_tag:
            {
            more_longs = push_cees (nilexp, nilexp, call_has_vcallees(cees), stack);
            break;
            }
        }
      }

      check_stack_max;
      reset_fpucon();
      not_in_params = old_nip;
      if (remove_struct_ref) {
        longs -= no(e);       /* struct return address removed by call */
        ret_stack_dec += no(e);
        post_offset = no(e);
      }
      if (postlude == nilexp && !untidy_call) {
        old_regsinuse = regsinuse;
        if (multi_reg)
          regsinuse |= 0x2;   /* prevent callins using pop edx */
        callins (longs, son (e), ret_stack_dec);
        regsinuse = old_regsinuse;
      }
      else {
        callins (0, son (e), ret_stack_dec);    /* delay arg stack return */
        if (untidy_call) {
          stack_dec = 0;      /* as alloca, must_use_bp */
          if (need_preserve_stack)
            save_stack ();
        };
      }
      must_use_bp = prev_use_bp;

      invalidate_dest (mw (nilexp, 0));

      clear_low_reg_record (crt_reg_record);
      cond1_set = 0;
      cond2_set = 0;          /* we don't know the state of the
                           conditions */
      if (eq_where (dest, zero))
      {
        if (reg_result (sh (e))) {/* answer in register */
          if (name (sh (e)) >= shrealhd && name (sh (e)) <= doublehd) {
            push_fl;
            discard_fstack();
          }
        }
      }
      else {
        where temp_dest;
        if (postlude == nilexp)
          temp_dest = dest;
        else {
          push_result = 1;
          temp_dest = pushdest;
        }
        if (reg_result (sh (e))) {/* answer in register */
          if (name (sh (e)) >= shrealhd && name (sh (e)) <= doublehd) {
            push_fl;
            move (sh (e), flstack, temp_dest);
          }
          else
            move (sh (e), reg0, temp_dest);
        }
        else
          failer(STRUCT_RES);  /* compound result */
      }

      if (postlude != nilexp) {
        int sz = rounder (shape_size(sh(e)), param_align);
        old_nip = not_in_postlude;
        not_in_postlude = 0;
        while (name(postlude) == ident_tag && name(son(postlude)) == caller_name_tag) {
          int n = no(son(postlude));
          exp a = arg;
          while (n != 0) {
            a = bro(a);
            n--;
          }
          if (name(a) != caller_tag)
            failer(BAD_POSTLUDE);
          no(postlude) = no(a) + stack_dec - post_offset;
          ptno(postlude) = callstack_pl;
          postlude = bro(son(postlude));
        }
        if (push_result) {
          stack_dec -= sz;
          check_stack_max;
        }
        coder (zero, stack, postlude);
        if (push_result) {
          if (name (dest.where_exp) == apply_tag) {
            move(sh(e), ind_sp, dest);
            stack_dec += sz;
          }
          else {
            longs += shape_size(sh(e));
            if (dest.where_exp == ind_sp.where_exp)
            dest.where_off += longs;
            move(sh(e), ind_sp, dest);
          }
        }
        stack_return (longs);
        not_in_postlude = old_nip;
      }

      return;
      };
    case tail_call_tag:
      {
      exp proc = son (e);
      exp cees = bro(proc);
      int longs;
      int prev_use_bp = must_use_bp;      /* may be altered by push_cees */
      int old_nip = not_in_params;
      int old_stack_dec = stack_dec;
      not_in_params = 0;
      switch (name(cees)) {
        case make_callee_list_tag:
          {
            not_in_params = 0;
            longs = procargs (stack, son(cees), call_has_checkstack(e));
            not_in_params = old_nip;
            break;
          }
        case make_dynamic_callee_tag:
          {
            longs = push_cees (son(cees), bro(son(cees)), 0, stack);
            break;
          }
        case same_callees_tag:
          {
            longs = 0;
            break;
          }
      }
      check_stack_max;

      /* clear off any unwanted fstack registers */
      {
        int good_fs = fstack_pos;
        while (fstack_pos > first_fl_reg)
          discard_fstack ();
        fstack_pos = good_fs;
        reset_fpucon();
      }

      if (longs == 0) {
        coder (reg0, stack, proc);  /* proc value to %eax */
        restore_callregs (0);
            /* stack reduced to old callees and return address */

        if (name(cees) == same_callees_tag) {
          if (callee_size < 0 && !call_has_vcallees(cees)) {
            outs (" popl %ecx\n");
            outs (" movl %ecx, (%esp)\n");
          }
          if (callee_size >= 0 && call_has_vcallees(cees)) {
            outs (" popl %ecx\n");
            outs (" leal "); outn((long)callee_size/8); outs("(%esp),%edx\n");
            outs (" pushl %edx\n");
            outs (" pushl %ecx\n");
          }
        }
        else {
          if (callee_size != 0 || call_has_vcallees(cees)) {
            outs (" popl %ecx\n");
            if (callee_size < 0) {
            outs (" popl %edx\n");
            outs (" movl %edx,%esp\n");
            }
            else
            if (callee_size == 0)
            outs (" movl %esp %edx\n");
            else {
            outs (" leal "); outn((long)callee_size/8); outs("(%esp),%edx\n");
            outs (" movl %edx,%esp\n");
            }
            if (call_has_vcallees(cees))
            outs (" pushl %edx\n");
            outs (" pushl %ecx\n");
          }
        }
        outs (" jmp *%eax\n\n");
      }
      else {
                  /* callees have been pushed */
        if (call_has_vcallees(cees)) {
          if (callee_size >= 0) {
            outs (" leal ");
            rel_ap (4 + callee_size/8, 1);
            outs (",%eax\n");
            ins0 (pusheax);
          }
          else {
            outs (" pushl ");
            rel_ap (4, 1);
          }
          outnl();
          stack_dec -= 32;
        }
        outs (" pushl ");
        rel_ap (0, 1);  /* push return address after callees */
        outnl();
        stack_dec -= 32;
        coder (pushdest, stack, proc);    /* push proc for call by return */
        stack_dec -= 32;
        check_stack_max;
        if (longs < 0) {      /* must be dynamic_callees */
          exp sz = bro(son(cees));
          move (slongsh, mw(sz,0), reg2);
          if (al2(sh(sz)) < param_align) {
            if (al2(sh(sz)) == 1) {
            outs (" addl $31,%ecx\n");
            outs (" shrl $3,%ecx\n");
            }
            else
            outs (" addl $3,%ecx\n");
            outs (" andl $-4,%ecx\n");
          }
        }
        if (!call_has_vcallees(cees)) {
          if (callee_size >= 0) {
            outs (" leal ");
            rel_ap (4 + callee_size/8, 1);
            outs (",%eax\n");
          }
          else {
            outs (" movl ");
            rel_ap (4, 1);
            outs (",%eax\n");
          }
        }

        restore_callregs (1);

            /* callees, return and proc to call are stacked */
            /* size in %ecx if longs<0; callers at %eax unless stacked for vcallees */
        outs (" pushl %esi\n");
        outs (" pushl %edi\n");
        if (call_has_vcallees(cees))
          outs (" movl 16(%esp),%edi\n");
        else
          outs (" movl %eax,%edi\n");
        if (longs < 0) {
          outs (" addl $");
          outn ((long)(call_has_vcallees(cees) ? 20 : 16));
          outs (", %ecx\n");
          outs (" leal -4(%esp),%esi\n");
          outs (" addl %ecx,%esi\n");
          outs (" shrl $2,%ecx\n");
        }
        else {
          outs (" movl $");
          outn ((long)(longs/32 + (call_has_vcallees(cees) ? 5 : 4)));
          outs (",%ecx\n");
          outs (" leal ");
          outn ((long)(longs/8 + (call_has_vcallees(cees) ? 16 : 12)));
          outs ("(%esp),%esi\n");
        }
        outs (" subl $4,%edi\n");
        outs (" std\n rep\n movsl\n cld\n");
        outs (" leal 4(%edi),%esp\n");
        outs (" popl %edi\n");
        outs (" popl %esi\n");
        outs (" ret\n");
      }

      cond1_set = 0;
      cond2_set = 0;
      stack_dec = old_stack_dec;
      must_use_bp = prev_use_bp;
      return;
      };
    case alloca_tag:
      {
      where sz_where;
        if (name(son(e)) == val_tag)
          {
          int n = no(son(e));
          if (name(sh(son(e))) != offsethd)
            n = 8 * n;
          sz_where = mw(zeroe, rounder(n, stack_align)/8);
          }
        else {
        exp temp = getexp(slongsh, nilexp, 0, nilexp, nilexp, 0, 0, val_tag);
          if (name(sh(son(e))) == offsethd && al2(sh(son(e))) == 1) {
          no(temp) = 31;
          bop (add, ulongsh, temp, son(e), reg0, stack);
            shiftr (ulongsh, mw(zeroe,3), reg0, reg0);
          and (ulongsh, mw (zeroe, -4), reg0, reg0);
          sz_where = reg0;
          }
          else if (al2(sh(son(e))) < 32) {
          no(temp) = 3;
          bop (add, ulongsh, temp, son(e), reg0, stack);
          and (ulongsh, mw (zeroe, -4), reg0, reg0);
          sz_where = reg0;
          }
        else {
          sz_where = reg0;
          coder (sz_where, stack, son(e));
        }
        retcell (temp);
        };
      if (checkalloc(e))
        checkalloc_stack(sz_where, 1);    /* uses reg1 */
      else
        sub (ulongsh, sz_where, sp, sp);
      if (!eq_where (dest, zero))
        move (sh (e), sp, dest);
      if (need_preserve_stack)
        save_stack ();
      return;
      };
    case last_local_tag:
      {
      move (sh (e), sp, dest);
      return;
      };
    case local_free_tag:
        move(slongsh, mw(son(e),0), sp);
        if (name(bro(son(e))) == val_tag)
          {
            int sz;
          int n = no(bro(son(e)));
          if (name(sh(bro(son(e)))) != offsethd)
            n = 8 * n;
          sz = rounder(n, stack_align);
            add(slongsh, mw(zeroe, sz/8), sp, sp);
          }
      else
          add(slongsh, mw(bro(son(e)), 0), sp, sp);
      add(slongsh, mw(zeroe, 3), sp, sp);
      and (slongsh, mw (zeroe, -stack_align/8), sp, sp);
      if (need_preserve_stack)
        save_stack ();
        return;
    case local_free_all_tag:
        set_stack_from_bp();
      if (need_preserve_stack)
        save_stack ();
        return;
    case ignorable_tag:
      coder(dest, stack, son(e));
      return;
    case res_tag:
    case untidy_return_tag:
      {
      int old_stack_dec = stack_dec;
#ifdef NEWDWARF
      long over_lab;
#endif
      cond1_set = 0;
      cond2_set = 0;
      {
        /* procedure call not inlined, this res is for a procedure */
        if (reg_result (sh (son (e)))) {/* answer to registers */
          int with_fl_reg = 0;
          /* int simple_res = (name(son(e)) == val_tag); */
          int  good_fs;

          /* if (!simple_res) */
          {
            if (name (sh (son (e))) >= shrealhd &&
              name (sh (son (e))) <= doublehd) {
              coder (flstack, stack, son (e));
              with_fl_reg = 1;
            }
            else {
              coder (reg0, stack, son (e));
            };
          };

          if (name (sh (son (e))) != bothd) {
            good_fs = fstack_pos;
            if (with_fl_reg) {/* jumping with a floating value */
              /* clear off any unwanted stack registers */
              while (fstack_pos > (first_fl_reg + 1))
                discard_st1 ();
              fstack_pos = good_fs - 1;
            }
            else {
              /* clear off any unwanted stack registers */
               while (fstack_pos > first_fl_reg)
                discard_fstack ();
              fstack_pos = good_fs;
            };
            reset_fpucon();
            if (name(e)==untidy_return_tag) {
            int old_regsinuse = regsinuse;
            regsinuse &= ~0x6;      /* %ecx, %edx not preserved */
            if (shape_size(sh(son(e))) > 32 && !with_fl_reg)
              regsinuse |= 0x2;     /* %edx used for return value */
            if (stack_dec != 0)
              stack_return (- stack_dec);
            regsinuse = old_regsinuse;
            outs (" pushl ");
            rel_ap (0, 1);    /* push return address for return after pops */
            outnl();
#ifdef NEWDWARF
            if (diagnose && dwarf2)
              dw2_untidy_return ();
#endif
            }
#ifdef NEWDWARF
            if (diagnose && dwarf2) {
            over_lab = next_dwarf_label ();
            dw2_return_pos (over_lab);
            }
#endif
            restore_callregs (name(e)==untidy_return_tag);
#if 0
            if (simple_res) { /* now done earlier for dw2_returns consistency */
              coder (reg0, stack, son (e));
            };
#endif

            if (name(e)==untidy_return_tag)
            ins0(ret);
            else
            retins();
            outnl();
#ifdef NEWDWARF
            if (diagnose && dwarf2)
            dw2_after_fde_exit (over_lab);
#endif
          };
          stack_dec = old_stack_dec;
          return;
        };
        failer(STRUCT_RETURN);
        return;
      };
      };
    case return_to_label_tag:
      {
      int good_fs = fstack_pos;
            /* clear off any unwanted stack registers */
      while (fstack_pos > first_fl_reg)
        discard_fstack ();
      fstack_pos = good_fs;
      reset_fpucon();
      move(slongsh, mw(son(e), 0), reg0);
      restore_callregs(0);
      ins0 ("jmp *%eax");
      return;
      };
    case movecont_tag:
      {
      exp frome = son (e);
      exp toe = bro (frome);
      exp lengthe = bro (toe);
      movecont (mw (frome, 0), mw (toe, 0), mw (lengthe, 0),
              isnooverlap(e));
      return;
      };
    case solve_tag:
      {
      exp jr = getexp (f_bottom, nilexp, 0, nilexp, nilexp, 0,
          0, 0);
      clean_stack();
        sonno(jr) = stack_dec;
        ptno(jr) = next_lab();
        fstack_pos_of(jr) = (prop)fstack_pos;
      /* jump record for end */
      solve (son (e), son (e), dest, jr, stack);
      if (name (sh (e)) != bothd) {
        align_label(0, jr);
        set_label (jr);
#ifdef NEWDWARF
        START_BB ();
#endif
      };
      fpucon = normal_fpucon;
      cond1_set = 0;
      cond2_set = 0;
      return;
      };
    case case_tag:
      {
      where qw;
      exp arg1 = son (e);
      exp b = bro (arg1);
      exp t = arg1;
      while (!last (t))
        t = bro (t);
      bro (t) = nilexp;

      if (!is_o (name (arg1)) || is_crc(arg1)) {
                        /* argument is not a possible 80386
                           operand, precompute it in reg0 */
        qw.where_exp = copyexp (reg0.where_exp);
        sh (qw.where_exp) = sh (arg1);
        qw.where_off = 0;
        coder (qw, stack, arg1);
        arg1 = qw.where_exp;
        bro (arg1) = b;
      };

      clean_stack();

      IGNORE caser (arg1, name(sh(e)) == bothd, e);

      return;
      };
#ifndef NEWDIAGS
    case diagnose_tag:  {
      diag_info * d = dno(e);
      if (d->key == DIAG_INFO_SOURCE)  {
        crt_lno = natint(d -> data.source.beg.line_no);
        crt_charno = natint(d -> data.source.beg.char_off);
        crt_flnm = d -> data.source.beg.file->file.ints.chars;
      };
        output_diag(d, crt_proc_id, e);
        coder(dest, stack, son(e));
        output_end_scope(d, e);
        return;
      };
#endif
    case trap_tag: {
      trap_ins (no(e));
      return;
      }
    case asm_tag: {
      if (props(e))
        asm_ins (e);
      else {
        start_asm ();
          coder(dest, stack, son(e));
        end_asm ();
      }
      clear_low_reg_record (crt_reg_record);
      return;
      }
    default:
      if (!is_a (name (e))) {
      failer (BADOP);
      return;
      };

      if (name(dest.where_exp) != val_tag)
      codec (dest, stack, e);
      else
      if (!optop(e)) {
      if (name(sh(e)) >= shrealhd && name(sh(e)) <= doublehd) {
        codec (flstack, stack, e);
        discard_fstack ();
      }
      else
        codec (reg0, stack, e);
      }
      else
      if (name(e)!=name_tag && name(e)!=env_offset_tag && son(e)!=nilexp) {
      exp l = son(e);         /* catch all discards with side-effects */
      for (;;) {
        coder (dest, stack, l);
        if (last(l)) break;
        l = bro(l);
      }
      }
      return;
  };
}

#ifdef NEWDIAGS
struct coder_args {
      where dest;
      ash stack;
      exp e;
};

static void coder2
    PROTO_N ( (args) )
    PROTO_T ( void * args )
{
  struct coder_args * x = (struct coder_args *) args;
  coder1 (x->dest, x->stack, x->e);
  return;
}

static dg_where dg_where_dest
    PROTO_N ( (e) )
    PROTO_T ( exp e )
{
  dg_where w;
  if (name(e) == name_tag || name(e) == reff_tag) {
    w = dg_where_dest (son(e));
    w.o += no(e)/8;
    return w;
  }
  if (name(e) != ident_tag)
    failer ("bad dg_where");
  if (isglob (e)) {
    w.k = WH_STR;
    w.u.s = (brog(e))->dec_u.dec_val.dec_id;
    w.o = 0;
    return w;
  }
  if (ptno(e) < 0 || ptno(e) > 10)  /* contop case */
    return (dg_where_dest (son(e)));
  switch (ptno (e)) {
    case local_pl: {
      w.k = WH_REGOFF;
      w.u.l = -2;
      w.o = no(e)/8;
      break;
    }
    case par_pl: {
      w.k = WH_REGOFF;
      w.u.l = -1;
      w.o = (no(e)/8) + 4;
      break;
    }
    case reg_pl: {
      w.k = WH_REG;
      w.u.l = get_reg_no (no(e));
      break;
    }
    default:
      failer ("bad dg_where");
      SET(w);
  }
  return w;
}

static dg_where contop_where
    PROTO_N ( (id) )
    PROTO_T ( exp id )
{
  return (dg_where_dest (bro(son(id))));
}


dg_where find_diag_res
    PROTO_N ( (args) )
    PROTO_T ( void * args )
{
  struct coder_args * x = (struct coder_args *) args;
  exp e = x->dest.where_exp;
  dg_where w;
  switch (name(e)) {
    case val_tag: {
      w.k = NO_WH;
      break;
    }
    case ident_tag:
    case name_tag: {
      w = dg_where_dest (e);
      break;
    }
    case ass_tag: {
      if (name(son(e)) == ident_tag)
      w = contop_where (son(e));
      else
      w = dg_where_dest (son(e));
      break;
    }
    case apply_tag: {
      w.k = WH_REGOFF;
      w.u.l = get_reg_no (no(son(sp.where_exp)));
      w.o = 0;
      break;
    }
    default:
      failer ("unexpected diag_res dest");
      SET(w);
  }
  return w;
}

void coder
    PROTO_N ( (dest, stack, e) )
    PROTO_T ( where dest X ash stack X exp e )
{
  dg_info d;
  dg_info was_current = current_dg_info;
  current_dg_info = nildiag;
  if (extra_diags) {
    switch (name (e)) {
      case apply_tag:
      case apply_general_tag: {
      d = dgf(e);
      while (d && d->key != DGA_CALL)
        d = d->more;
      if (!d) {
        d = new_dg_info (DGA_CALL);
        d->data.i_call.clnam = (char*)0;
        d->data.i_call.pos = no_short_sourcepos;
        d->data.i_call.ck = 0;
        dgf(e) = combine_diaginfo (dgf(e), d);
      }
      break;
      }
      case test_tag: {
      d = dgf(e);
      if (dw_doing_branch_tests)
        break;
      while (d && d->key != DGA_TEST)
        d = d->more;
      if (!d) {
        d = new_dg_info (DGA_TEST);
        d->data.i_tst.pos = no_short_sourcepos;
        d->data.i_tst.inv = 0;
        dgf(e) = combine_diaginfo (dgf(e), d);
      }
      break;
      }
      case goto_tag: {
      short_sourcepos p;
      d = dgf(e);
      if (dw_doing_branch_tests)
        break;
      p = no_short_sourcepos;
      while (d && d->key != DGA_JUMP) {
        if (d->key == DGA_SRC)
          p = d->data.i_src.startpos;
        d = d->more;
      }
      if (!d) {
        d = new_dg_info (DGA_JUMP);
        d->data.i_tst.pos = p;
        dgf(e) = combine_diaginfo (dgf(e), d);
      }
      break;
      }
      case goto_lv_tag:
      case return_to_label_tag:
      case long_jump_tag:
      case tail_call_tag: {
      d = dgf(e);
      if (dw_doing_branch_tests)
        break;
      while (d && d->key != DGA_LJ)
        d = d->more;
      if (!d) {
        d = new_dg_info (DGA_LJ);
        d->data.i_tst.pos = no_short_sourcepos;
        dgf(e) = combine_diaginfo (dgf(e), d);
      }
      break;
      }
    }
  }
  d = dgf(e);
  if (d != nildiag) {
    dg_info dpos = nildiag;
    struct coder_args args;
    args.dest = dest;
    args.stack = stack;
    current_dg_exp = args.e = e;
    while (d != nildiag) {
      if (d->key == DGA_SRC && d->data.i_src.startpos.file)  {
      crt_lno = d->data.i_src.startpos.line;
      crt_charno = d->data.i_src.startpos.column;
      crt_flnm = d->data.i_src.startpos.file->file_name;
        if (d->data.i_src.endpos.file)  {
        dpos = d;
        break;
      }
      };
      d = d->more;
    };
#ifdef NEWDWARF
    CODE_DIAG_INFO (dgf(e), crt_proc_id, coder2, (void*)&args);
#else
    code_diag_info (dgf(e), crt_proc_id, coder2, (void*)&args);
#endif
    if (dpos) {
      crt_lno = dpos->data.i_src.endpos.line;
      crt_charno = dpos->data.i_src.endpos.column;
      crt_flnm = dpos->data.i_src.endpos.file->file_name;
    };
  }
  else
    coder1 (dest, stack, e);
  current_dg_info = was_current;
  return;
}



static void done_arg
    PROTO_N ( (args) )
    PROTO_T ( void * args )
{
  UNUSED (args);
  return;
}

void diag_arg
    PROTO_N ( (dest, stack, e) )
    PROTO_T ( where dest X ash stack X exp e )
{
  if (dgf(e)) {
    struct coder_args args;
    args.dest = dest;
    args.stack = stack;
    current_dg_exp = args.e = e;
#ifdef NEWDWARF
    CODE_DIAG_INFO (dgf(e), crt_proc_id, done_arg, (void*)&args);
#else
    code_diag_info (dgf(e), crt_proc_id, done_arg, (void*)&args);
#endif
  }
  return;
}


#endif


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