Initial revision

This commit is contained in:
ceriel 1989-02-14 15:52:25 +00:00
parent eb3dcf275e
commit 01626b2c32
3 changed files with 332 additions and 0 deletions

4
mach/i386/ncg/.distr Normal file
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Makefile
mach.c
mach.h
table

295
mach/i386/ncg/mach.c Normal file
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/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*
*/
#ifndef NORCSID
static char rcs_m[]= "$Header$" ;
static char rcs_mh[]= ID_MH ;
#endif
/*
* machine dependent back end routines for the Intel 80386
*/
con_part(sz,w) register sz; word w; {
while (part_size % sz)
part_size++;
if (part_size == TEM_WSIZE)
part_flush();
if (sz == 1 || sz == 2) {
w &= (sz == 1 ? 0xFF : 0xFFFF);
w <<= 8 * part_size;
part_word |= w;
} else {
assert(sz == 4);
part_word = w;
}
part_size += sz;
}
con_mult(sz) word sz; {
long l;
if (sz != 4)
fatal("bad icon/ucon size");
l = atol(str);
fprintf(codefile,"\t.data4 %ld\n", l);
}
#ifdef NOFLOAT
con_float() {
static int been_here;
if (argval != 4 && argval != 8)
fatal("bad fcon size");
fputs(".data4\t", codefile);
if (argval == 8)
fputs("0,", codefile);
fputs("0 !dummy float\n", codefile);
if ( !been_here++)
{
fputs("Warning : dummy float-constant(s)\n", stderr);
}
}
#else
#define IEEEFLOAT
con_float() {
double f;
double atof();
int i;
int j;
double frexp();
#ifndef OWNFLOAT
int sign = 0;
int fraction[4] ;
#else OWNFLOAT
float fl;
char *p;
#endif OWNFLOAT
if (argval!= 4 && argval!= 8) {
fprintf(stderr,"float constant size = %d\n",argval);
fatal("bad fcon size");
}
fprintf(codefile,"!float %s sz %d\n", str, argval);
f = atof(str);
if (f == 0) {
if (argval == 8) fprintf(codefile, ".data4 0\n");
fprintf(codefile, ".data4 0\n");
return;
}
#ifdef OWNFLOAT
if (argval == 4) {
/* careful: avoid overflow */
double ldexp();
f = frexp(f, &i);
fl = f;
fl = frexp(fl,&j);
if (i+j > 127) {
/* overflow situation */
fprintf(codefile, ".data1 0%o, 0377, 0377, 0377 ! overflow\n",
f < 0 ? 0377 : 0177);
return;
}
if (i+j < -127) {
/* underflow situation */
fprintf(codefile, ".data1 0%o, 0200, 0, 0 ! underflow\n",
f < 0 ? 0200 : 0);
return;
}
fl = ldexp(fl, i+j);
p = (char *) &fl;
}
else {
p = (char *) &f;
}
fprintf(codefile, ".data1 0%o", *p++ & 0377);
for (i = argval-1; i; i--) {
fprintf(codefile,",0%o", *p++ & 0377);
}
#else OWNFLOAT
f = frexp(f, &i);
if (f < 0) {
f = -f;
sign = 1;
}
while (f < 0.5) {
f += f;
i --;
}
f = 2*f - 1.0; /* hidden bit */
#ifdef IEEEFLOAT
if (argval == 4) {
#endif IEEEFLOAT
i = (i + 128) & 0377;
fraction[0] = (sign << 15) | (i << 7);
for (j = 6; j>= 0; j--) {
f *= 2;
if (f >= 1.0) {
f -= 1.0;
fraction[0] |= (1 << j);
}
}
#ifdef IEEEFLOAT
}
else {
i = (i + 1024) & 03777;
fraction[0] = (sign << 15) | (i << 4);
for (j = 3; j>= 0; j--) {
f *= 2;
if (f >= 1.0) {
fraction[0] |= (1 << j);
f -= 1.0;
}
}
}
#endif IEEEFLOAT
for (i = 1; i < argval / 2; i++) {
fraction[i] = 0;
for (j = 15; j>= 0; j--) {
f *= 2;
if (f >= 1.0) {
fraction[i] |= (1 << j);
f -= 1.0;
}
}
}
if (f >= 0.5) {
for (i = argval/2 - 1; i >= 0; i--) {
for (j = 0; j < 16; j++) {
if (fraction[i] & (1 << j)) {
fraction[i] &= ~(1 << j);
}
else {
fraction[i] |= (1 << j);
break;
}
}
if (j != 16) break;
}
}
for (i = 0; i < argval/2; i++) {
fprintf(codefile,
i != 0 ? ", 0%o, 0%o" : ".data1 0%o, 0%o",
(fraction[i]>>8)&0377,
fraction[i]&0377);
}
#endif OWNFLOAT
putc('\n', codefile);
}
#endif
/*
string holstr(n) word n; {
sprintf(str,hol_off,n,holno);
return(mystrcpy(str));
}
*/
prolog(nlocals) full nlocals; {
if (nlocals < 32767) {
fprintf(codefile, "\tenter %ld,0\n", nlocals);
}
else {
fputs("\tenter 0,0\n", codefile);
fprintf(codefile, "\tsub\tesp,%ld\n",nlocals);
}
}
#ifdef REGVARS
long si_off;
long di_off;
int firstreg;
regscore(off, size, typ, score, totyp)
long off;
{
if (size != 4) return -1;
score -= 1;
score += score;
if (typ == reg_pointer || typ == reg_loop) score += (score >> 2);
score -= 2; /* cost of saving */
if (off >= 0) score -= 3;
return score;
}
i_regsave()
{
si_off = -1;
di_off = -1;
firstreg = 0;
}
f_regsave()
{
}
regsave(regstr, off, size)
char *regstr;
long off;
{
if (strcmp(regstr, "esi") == 0) {
if (! firstreg) firstreg = -1;
si_off = off;
fputs("push esi\n", codefile);
if (off >= 0)
fprintf(codefile, "mov esi,%ld(ebp)\n", off);
}
else {
if (! firstreg) firstreg = 1;
di_off = off;
fputs("push edi\n", codefile);
if (off >= 0)
fprintf(codefile, "mov edi,%ld(ebp)\n", off);
}
}
regreturn()
{
if (firstreg == 1) {
if (si_off != -1) fputs("pop esi\n", codefile);
fputs("pop edi\n", codefile);
}
else if (firstreg == -1) {
if (di_off != -1) fputs("pop edi\n", codefile);
fputs("pop esi\n", codefile);
}
fputs("leave\nret\n", codefile);
}
#endif REGVARS
mes(type) word type ; {
int argt ;
switch ( (int)type ) {
case ms_ext :
for (;;) {
switch ( argt=getarg(
ptyp(sp_cend)|ptyp(sp_pnam)|sym_ptyp) ) {
case sp_cend :
return ;
default:
strarg(argt) ;
fprintf(codefile, ".define %s\n",argstr) ;
break ;
}
}
default :
while ( getarg(any_ptyp) != sp_cend ) ;
break ;
}
}
char *segname[] = {
".sect .text", /* SEGTXT */
".sect .data", /* SEGCON */
".sect .rom", /* SEGROM */
".sect .bss" /* SEGBSS */
};

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mach/i386/ncg/mach.h Normal file
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/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*/
#ifndef NORCSID
#define ID_MH "$Header$"
#endif
#define ex_ap(y) fprintf(codefile,".extern %s\n",y)
#define in_ap(y) /* nothing */
#define newilb(x) fprintf(codefile,"%s:\n",x)
#define newdlb(x) fprintf(codefile,"%s:\n",x)
#define dlbdlb(x,y) fprintf(codefile,"%s = %s\n",x,y)
#define newlbss(l,x) fprintf(codefile,"%s: .space\t%ld\n",l,x);
#define cst_fmt "%ld"
#define off_fmt "%ld"
#define ilb_fmt "I%x_%x"
#define dlb_fmt "I_%d"
#define hol_fmt "hol%d"
#define hol_off "%ld+hol%d"
#define con_cst(x) fprintf(codefile,".data4\t%ld\n",x)
#define con_ilb(x) fprintf(codefile,".data4\t%s\n",x)
#define con_dlb(x) fprintf(codefile,".data4\t%s\n",x)
#define modhead ".sect .text; .sect .rom; .sect .data; .sect .bss\n"
#define fmt_id(fr,to) sprintf(to, "_%s", fr)
#define BSS_INIT 0