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use con_float file, and use new interface to fif and fef routines

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This commit is contained in:
ceriel 1989-07-31 14:25:53 +00:00
parent 3e194345cf
commit 0ef99949bc
2 changed files with 7 additions and 159 deletions
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146
mach/i86/ncg/mach.c
View file

@ -41,149 +41,9 @@ con_mult(sz) word sz; {
(int)l&0xFFFF,(int)(l>>16)&0xFFFF);
}
#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, ".data2 0, 0\n");
fprintf(codefile, ".data2 0, 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
#define CODE_GENERATOR
#define IEEEFLOAT
#include <con_float>
/*

20
mach/i86/ncg/table
View file

@ -1119,22 +1119,10 @@ pat dvf $1==4 leaving cal ".dvf4" asp 4
pat dvf $1==8 leaving cal ".dvf8" asp 8
pat ngf $1==4 leaving cal ".ngf4"
pat ngf $1==8 leaving cal ".ngf8"
pat fif $1==4 leaving cal ".fif4"
pat fif $1==8 leaving cal ".fif8"
pat fef $1==4
with REG REG
kills ALL
gen push %2
push %2
push %1 leaving cal ".fef4"
pat fef $1==8
with REG REG REG REG
kills ALL
gen push %4
push %4
push %3
push %2
push %1 leaving cal ".fef8"
pat fif $1==4 leaving lor 1 cal ".fif4" asp 2
pat fif $1==8 leaving lor 1 cal ".fif8" asp 2
pat fef $1==4 leaving lor 1 adp 0-2 cal ".fef4"
pat fef $1==8 leaving lor 1 adp 0-2 cal ".fef8"
/******************************************************************
* Group 6: Pointer Arithmetic *