166 lines
4 KiB
Plaintext
166 lines
4 KiB
Plaintext
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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/* #define NOFLOAT for machines without floating point
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#define ACKFLOAT for machines using the ACK floating point software
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#define IEEEFLOAT for machines using IEEE floating point format
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#define OWNFLOAT to use floating point format of machine on which
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the code generator runs
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If none of these are defined, PDP-11 format is generated.
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*/
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#ifdef NOFLOAT
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con_float() {
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static int been_here;
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if (argval != 4 && argval != 8)
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fatal("bad fcon size");
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fputs(".data4\t", codefile);
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if (argval == 8)
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fputs("0,", codefile);
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fputs("0 !dummy float\n", codefile);
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if ( !been_here++) {
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fputs("Warning : dummy float-constant(s)\n", stderr);
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}
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}
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#else /* NOFLOAT */
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#include <ctype.h>
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#ifndef OWNFLOAT
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#include <flt_arith.h>
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#endif /* OWNFLOAT */
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con_float() {
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int i, j;
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char *p;
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#ifdef OWNFLOAT
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float fl;
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double f;
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double atof();
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#else /* OWNFLOAT */
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int overflow = 0;
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flt_arith e;
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char buf[8];
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#endif /* OWNFLOAT */
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if (argval!= 4 && argval!= 8) {
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fprintf(stderr,"float constant size = %d\n",argval);
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fatal("bad fcon size");
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}
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fprintf(codefile,"!float %s sz %d\n", str, argval);
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#ifdef OWNFLOAT
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f = atof(str);
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if (argval == 4) {
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fl = f;
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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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fprintf(codefile, ".data1 0%o", *p++ & 0377);
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for (i = argval-1; i; i--) {
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fprintf(codefile,",0%o", *p++ & 0377);
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}
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#else /* OWNFLOAT */
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flt_str2flt(str, &e);
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#if IEEEFLOAT+ACKFLOAT
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if (argval == 4) {
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#endif
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e.flt_exp += 127;
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#ifndef IEEEFLOAT
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e.flt_exp += 2;
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#endif
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if (e.flt_mantissa.flt_h_32 == 0) e.flt_exp = 0;
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#if IEEEFLOAT+ACKFLOAT
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if (e.flt_exp >= 255) {
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overflow = 1;
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e.flt_exp = 255;
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e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0;
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}
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if (e.flt_exp <= 0) {
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#if IEEEFLOAT
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flt_b64_sft(&(e.flt_mantissa), 1);
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if (e.flt_exp < 0) {
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flt_b64_sft(&(e.flt_mantissa), -e.flt_exp);
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e.flt_exp = 0;
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}
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#else
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e.flt_exp = 0;
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e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0;
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#endif
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}
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#endif
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buf[0] = (e.flt_sign << 7) | (e.flt_exp >> 1);
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buf[1] = ((e.flt_exp&1) << 7) |
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((e.flt_mantissa.flt_h_32 & 0x7fffffff) >> 24);
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buf[2] = e.flt_mantissa.flt_h_32 >> 16;
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buf[3] = e.flt_mantissa.flt_h_32 >> 8;
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if (argval == 8) {
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buf[4] = e.flt_mantissa.flt_h_32;
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buf[5] = e.flt_mantissa.flt_l_32 >> 24;
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buf[6] = e.flt_mantissa.flt_l_32 >> 16;
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buf[7] = e.flt_mantissa.flt_l_32 >> 8;
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flt_b64_sft(&(e.flt_mantissa), -56);
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}
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else flt_b64_sft(&(e.flt_mantissa), -24);
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#if IEEEFLOAT+ACKFLOAT
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}
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else {
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e.flt_exp += 1023;
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#ifndef IEEEFLOAT
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e.flt_exp += 2;
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#endif
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if (e.flt_mantissa.flt_h_32 == 0) e.flt_exp = 0;
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if (e.flt_exp >= 2047) {
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overflow = 1;
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e.flt_exp = 2047;
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e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0;
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}
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if (e.flt_exp <= 0) {
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#if IEEEFLOAT
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flt_b64_sft(&(e.flt_mantissa), 1);
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if (e.flt_exp < 0) {
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flt_b64_sft(&(e.flt_mantissa), -e.flt_exp);
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e.flt_exp = 0;
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}
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#else
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e.flt_exp = 0;
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e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0;
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#endif
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}
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buf[0] = (e.flt_sign << 7) | (e.flt_exp >> 4);
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buf[1] = ((e.flt_exp & 017)<< 4) | ((e.flt_mantissa.flt_h_32 >> 27) & 017);
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buf[2] = e.flt_mantissa.flt_h_32 >> 19;
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buf[3] = e.flt_mantissa.flt_h_32 >> 11;
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buf[4] = e.flt_mantissa.flt_h_32 >> 3;
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buf[5] = (e.flt_mantissa.flt_h_32 << 5) | ((e.flt_mantissa.flt_l_32 >> 27) & 037);
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buf[6] = e.flt_mantissa.flt_l_32 >> 19;
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buf[7] = e.flt_mantissa.flt_l_32 >> 11;
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flt_b64_sft(&(e.flt_mantissa), -53);
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}
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#endif
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i = argval-1;
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if (! overflow && (e.flt_mantissa.flt_h_32 & 0x80000000)) for (; i>=0; i--) {
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if ((buf[i] &0377) != 0377) {
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buf[i]++;
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break;
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}
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else buf[i] = 0;
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}
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if (overflow || i < 0) {
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fprintf(stderr, "Warning: overflow in floating point constant %s\n", str);
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}
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for (i = 0; i < argval; i++) {
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fprintf(codefile,
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i != 0 ? ",0%o" : ".data1 0%o",
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buf[i]&0377);
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}
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#endif /* OWNFLOAT */
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putc('\n', codefile);
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}
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#endif /* NOFLOAT */
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