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/*

    		 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.

*/

/* 	$Id: code_here.c,v 1.1.1.1 1998/01/17 15:55:58 release Exp $	 */

#ifndef lint

static char vcid[] = "$Id: code_here.c,v 1.1.1.1 1998/01/17 15:55:58 release Exp $";

#endif /* lint */

/*

** code_here.c

*/

/*

$Log: code_here.c,v $

 * Revision 1.1.1.1  1998/01/17  15:55:58  release

 * First version to be checked into rolling release.

 *

 * Revision 1.3  1995/08/21  08:42:55  john

 * Changed include files

 *

 * Revision 1.2  1995/05/23  10:53:17  john

 * Changes for spec 3.1

 *

 * Revision 1.1.1.1  1995/03/23  10:39:02  john

 * Entered into CVS

 *

 * Revision 1.7  1995/03/23  09:59:49  john

 * Fixed so the assignment of a := (top_tag) gives zero.

 *

*/

#include "config.h"

#include "common_types.h"

#include "addresstypes.h"

#include "procrectypes.h"

#include "labels.h"

#include "expmacs.h"

#include "tags.h"

#include "coder.h"

#include "exp.h"

#include "bitsmacs.h"

#include "locate.h"

#include "inst_fmt.h"

#include "alpha_ins.h"

#include "shapemacs.h"

#include "special.h"

#include "handle_sregs.h"

#include "regexps.h"

#include "code_here.h"

#include "reg_defs.h"

/*

  regofval

  The procedure regofval checks to see if an exp is a load_tag

  that has been allocated into a fixpnt register and if so return 

  it or else 100.

*/

int   regofval

    PROTO_N ( ( e ) )

    PROTO_T ( exp e )

{

  exp decx = son (e);

  if (name (e) == name_tag && name (decx) == ident_tag) {/* ident tag */

    if ((props (decx) & defer_bit) != 0) {

      return regofval (son (decx));

    }

    if ((props (decx) & inreg_bits) != 0) {

      return ((isvar (decx)) ? (-no (decx)) : (no (decx)));

    }

    return 100;

  }

  else

  if ((name (e) == val_tag && no (e) == 0) || name(e) == clear_tag ||

    name(e) == top_tag) {

	return 31;

  }

  else {

	return 100;

  }

}

/*

  add code to return 31 if fval is 0.0

*/

int   fregofval

    PROTO_N ( ( e ) )

    PROTO_T ( exp e )

{

  exp decx = son (e);

  if (name (e) == name_tag && name (decx) == ident_tag) {

    if ((props (decx) & infreg_bits) != 0) {

      return no (decx);

    }

#if 0

    if((props(decx) & infreg_bits) != 0){

      return ((isvar(decx))?(-no(decx)):(no(decx)));

    }

#endif

    return 100;

  }

  else

    if(name(e) == clear_tag || name(e) == top_tag){

      return 0;

    }

    else {

      return 100;

    }

}

/*

  code_here

  The procedure code_here calls make_code and ensures that

  any internal exit labels are tied up after the call.

*/

int   code_here

    PROTO_N ( ( e, sp, dest ) )

    PROTO_T ( exp e X space sp X where dest )

{

  makeans mka;

#if DO_SCHEDULE && ENCAPSULATE_LABELS

  if(name(e) == rep_tag) start_new_capsule(true);

#endif

  mka = make_code (e, sp, dest, 0);

  if (mka.lab != 0) {

    (void)set_label (mka.lab);

#if DO_SCHEDULE && ENCAPSULATE_LABELS

    if(name(e) == rep_tag) close_capsule();

#endif    

  }

  return mka.regmove;

}

ash ash0 = {

  0, 0

};

ash ash32 = {

  32, 32

};

ash ash64 = {

  64,64

};

int reg_operand

    PROTO_N ( ( e, sp ) )

    PROTO_T ( exp e X space sp )

{

  int   x = regofval (e);

  ans aa;

  where w;

  if (x >= 0 && x < 100) {

    return x;

  }				/* x is a register for e */

  if (name (e) == cont_tag) {

    x = regofval (son (e));

    if (x < 0) {

      return (-x);

    }

  }

  else

    if (name (e) == apply_tag || (name(e) == apply_general_tag && 

	specialfn (son (e)) == 0)) {

				/* apply proc */

      setregalt (aa, RESULT_REG);

      w.answhere = aa;

      w.ashwhere = ash0;

      (void)make_code (e, sp, w, 0);

      return RESULT_REG;	/* simple proc calls give result in reg 0

				*/

    }

  aa = iskept (e);

  if (aa.discrim == inreg && regalt (aa) != NO_REG) {

				/* the same expression has already been

				   evaluated into a reg */

    return regalt (aa);

  }

  if (aa.discrim == notinreg) {

    instore is;

    is = insalt (aa);

    if (is.adval && is.b.offset == 0) {

      int   r = is.b.base;

      /* the same expression has already been evaluated into a reg */

      return r;

    }

  }

  {

    int   reg = -1;

    setsomeregalt (aa, &reg);

    /* allow code_here to evaluate e into reg of its choice */

    w.answhere = aa;

    w.ashwhere = ashof (sh (e));

    (void)code_here (e, sp, w);	

    Assert(reg!=-1);

    keepreg (e, reg);

    return reg;

  }

}

int   freg_operand

    PROTO_N ( ( e, sp ) )

    PROTO_T ( exp e X space sp )

{

  int   x = fregofval (e);

  ans aa;

  where w;

  freg fr;

  w.ashwhere = ashof (sh (e));

  if (x >= 0 && x < 100) {

    return x;

  }

  if (name (e) == cont_tag) {

    x = fregofval (son (e));

    if (x < 100) {

      return (x);

    }

  }

  else

    if (name (e) == apply_tag || name(e) == apply_general_tag) {

      if(is_floating(name(sh(e)))) {

	freg fr;

	fr.fr = 0;

	fr.type = (name(e)==realhd)?IEEE_double:IEEE_single;

	setfregalt(aa,fr);

      }

      else{

	setregalt (aa, 0);

      }

      w.answhere = aa;

      w.ashwhere = ash0;

      (void)make_code (e, sp, w, 0);

      return 0;

    }

  aa = iskept (e);

  if (aa.discrim == infreg) {	/* e already evaluated in fl reg */

    return regalt (aa) /* cheat */ ;

  }

 { int reg = -1;

   somefreg sfr;

   sfr.fr = ®

   if(w.ashwhere.ashsize==64)

     fr.type = IEEE_double;

   else

     fr.type = IEEE_single;

   sfr.type = fr.type;

   setsomefregalt (aa, sfr);

   w.answhere = aa;

  /* evaluate e into reg ... */

  (void)code_here (e, sp, w);

   fr.fr = reg;

   setfregalt(aa, fr);

   keepexp (e, aa);

   return reg;

 }

}