167 lines
2.7 KiB
C
167 lines
2.7 KiB
C
#include "mach.h"
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#include <back.h>
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#include <stdio.h>
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arg_error( s, arg)
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char *s;
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int arg;
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{
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fprintf( stderr, "arg_error %s %d\n", s, arg);
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}
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/*
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do_open( filename)
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char *filename;
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{
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if ( filename == (char *)0 || !sys_open( filename, OP_WRITE, &codefile))
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return( 0);
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fprint( codefile, ".sect .text; .sect .rom; .sect .data; .sect .bss\n");
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return( 1);
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}
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*/
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con_float(str, argval)
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char *str;
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int argval;
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{
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#ifdef NOFLOAT
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static int been_here;
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if (argval != 4 && argval != 8)
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arg_error("fcon", argval);
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if (argval == 8)
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gen4((FOUR_BYTES) 0);
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gen4((FOUR_BYTES) 0);
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if ( !been_here++)
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{
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fputs("Warning : dummy float-constant(s)\n", stderr);
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}
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#else
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#define IEEEFLOAT
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double f;
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double atof();
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int i;
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int j;
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double frexp();
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#ifndef OWNFLOAT
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int sign = 0;
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int fraction[4] ;
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#else OWNFLOAT
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float fl;
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char *p;
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#endif OWNFLOAT
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if (argval!= 4 && argval!= 8) {
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arg_error("fcon", argval);
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argval = 8;
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}
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f = atof(str);
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if (f == 0) {
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if (argval == 8) gen4((FOUR_BYTES) 0);
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gen4((FOUR_BYTES) 0);
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return;
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}
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#ifdef OWNFLOAT
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if (argval == 4) {
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/* careful: avoid overflow */
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double ldexp();
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f = frexp(f, &i);
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fl = f;
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fl = frexp(fl,&j);
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if (i+j > 127) {
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/* overflow situation */
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gen1(f<0?0377:0177);
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gen1(0377);
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gen1(0377);
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gen1(0377);
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return;
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}
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if (i+j < -127) {
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/* underflow situation */
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gen1(f<0?0200:0);
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gen1(0200);
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gen1(0);
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gen1(0);
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return;
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}
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fl = ldexp(fl, i+j);
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p = (char *) &fl;
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}
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else {
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p = (char *) &f;
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}
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gen1(*p++&0377);
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for (i = argval-1; i; i--) {
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gen1(*p++&0377);
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}
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#else OWNFLOAT
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f = frexp(f, &i);
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if (f < 0) {
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f = -f;
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sign = 1;
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}
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while (f < 0.5) {
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f += f;
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i --;
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}
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f = 2*f - 1.0; /* hidden bit */
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#ifdef IEEEFLOAT
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if (argval == 4) {
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#endif IEEEFLOAT
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i = (i + 128) & 0377;
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fraction[0] = (sign << 15) | (i << 7);
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for (j = 6; j>= 0; j--) {
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f *= 2;
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if (f >= 1.0) {
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f -= 1.0;
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fraction[0] |= (1 << j);
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}
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}
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#ifdef IEEEFLOAT
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}
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else {
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i = (i + 1024) & 03777;
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fraction[0] = (sign << 15) | (i << 4);
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for (j = 3; j>= 0; j--) {
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f *= 2;
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if (f >= 1.0) {
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fraction[0] |= (1 << j);
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f -= 1.0;
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}
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}
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}
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#endif IEEEFLOAT
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for (i = 1; i < argval / 2; i++) {
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fraction[i] = 0;
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for (j = 15; j>= 0; j--) {
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f *= 2;
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if (f >= 1.0) {
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fraction[i] |= (1 << j);
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f -= 1.0;
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}
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}
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}
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if (f >= 0.5) {
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for (i = argval/2 - 1; i >= 0; i--) {
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for (j = 0; j < 16; j++) {
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if (fraction[i] & (1 << j)) {
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fraction[i] &= ~(1 << j);
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}
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else {
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fraction[i] |= (1 << j);
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break;
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}
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}
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if (j != 16) break;
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}
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}
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for (i = 0; i < argval/2; i++) {
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gen1((fraction[i]>>8)&0377);
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gen1(fraction[i]&0377);
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}
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#endif OWNFLOAT
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#endif
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}
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