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use the con_float include file

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ceriel 1989-10-04 10:28:50 +00:00
parent 008a907894
commit 463a0e7f40
1 changed files with 31 additions and 67 deletions
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94
mach/pdp/cg/mach.c
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@ -46,78 +46,42 @@ con_mult(sz) word sz; {
#endif #endif
} }
/* #define PDPFLOAT
* The next function is difficult to do when not running on a PDP 11 or VAX #include <con_float>
* The strategy followed is to assume the code generator is running on a PDP 11
* unless the ACK_ASS define is on.
*/
con_float() { con_float()
#ifdef ACK_ASS {
double f; char buf[8];
double atof(), frexp(); int rval = float_cst(str, argval, buf);
int i, j;
int sign = 0;
int fraction ;
if (argval != 4 && argval != 8)
fatal("bad fcon size");
f = atof(str);
if (f == 0) {
if (argval == 8) fprintf(codefile, ".data2 0, 0\n");
fprintf(codefile, ".data2 0, 0\n");
return;
}
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 */
i = (i + 128) & 0377;
fraction = (sign << 15) | (i << 7);
for (j = 6; j>= 0; j--) {
f *= 2;
if (f >= 1.0) {
fraction |= (1 << j);
f -= 1.0;
}
}
fprintf(codefile, ".data2 0%o", fraction);
for (i = argval / 2 - 1; i; i--) {
fraction = 0;
for (j = 15; j>= 0; j--) {
f *= 2;
if (f >= 1.0) {
fraction |= (1 << j);
f -= 1.0;
}
}
fprintf(codefile, ", 0%o", fraction);
}
putc('\n', codefile);
#else
double f;
double atof();
int i; int i;
short *p;
if (argval != 4 && argval != 8) if (rval == 1) {
fprintf(stderr,"float constant size = %d\n",argval);
fatal("bad fcon size"); fatal("bad fcon size");
f = atof(str);
p = (short *) &f;
i = *p++;
if (argval == 8) {
fprintf(codefile,"\t%o;%o;",i,*p++);
i = *p++;
} }
fprintf(codefile,"\t%o;%o\n",i,*p++); #ifdef ACK_ASS
fprintf(codefile,"! float %s sz %d\n", str, argval);
#else
fprintf(codefile,"/ float %s sz %d\n", str, argval);
#endif #endif
if (rval == 2) {
fprintf(stderr, "Warning: overflow in floating point constant %s\n", str);
} }
#ifdef ACK_ASS
fprintf(codefile, ".data1 0%o", buf[1] & 0377);
for (i = 1; i < argval; i++) {
/* use little trick to get bytes out in swapped order ... */
fprintf(codefile, ",0%o", buf[i^1] & 0377);
}
#else
for (i = 0; i < argval; i++) {
/* use little trick to get bytes out in swapped order ... */
fprintf(codefile, "??? %o", buf[i^1] & 0377);
}
#endif
putc('\n', codefile);
}
#endif /* ACK_ASS */
#ifdef REGVARS #ifdef REGVARS