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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, ®);
/* 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;
}
}