+++ /dev/null
-/*
- (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
- See the copyright notice in the ACK home directory, in the file "Copyright".
-*/
-
-/* $Id$ */
-
-/*
- #define CODE_GENERATOR for code generator
- #define CODE_EXPANDER for code expander
-
- #define IEEEFLOAT for machines using IEEE floating point format
- #define PDPFLOAT for machines using the PDP-11 floating point format
- If none of these are defined, the format of the machine on which the
- code generator runs is used.
- Returns 1 if sz has an illegal value, 2 in case of overflow,
- and 0 if all went well.
- If neither IEEEFLOAT nor PDPFLOAT are defined, the return value is not
- trustworthy.
-
- Unfortunately, the IEEE standard does not define the byte-order.
- depends on the #defines
- FL_MSL_AT_LOW_ADDRESS 1 if most significant long is at low address
- FL_MSW_AT_LOW_ADDRESS 1 if most significant word is at low address
- FL_MSB_AT_LOW_ADDRESS 1 if most significant byte is at low address
-*/
-#ifdef IEEEFLOAT
-#define USE_FLT
-#endif
-#ifdef PDPFLOAT
-#define USE_FLT
-#undef FL_MSL_AT_LOW_ADDRESS
-#define FL_MSL_AT_LOW_ADDRESS 1
-#undef FL_MSW_AT_LOW_ADDRESS
-#define FL_MSW_AT_LOW_ADDRESS 1
-#undef FL_MSB_AT_LOW_ADDRESS
-#define FL_MSB_AT_LOW_ADDRESS 0
-#endif
-
-#define I0 ((FL_MSL_AT_LOW_ADDRESS ? 0 : 4) + (FL_MSW_AT_LOW_ADDRESS ? 0 : 2) \
- + (FL_MSB_AT_LOW_ADDRESS ? 0 : 1))
-#define I1 ((FL_MSL_AT_LOW_ADDRESS ? 0 : 4) + (FL_MSW_AT_LOW_ADDRESS ? 0 : 2) \
- + (FL_MSB_AT_LOW_ADDRESS ? 1 : 0))
-#define I2 ((FL_MSL_AT_LOW_ADDRESS ? 0 : 4) + (FL_MSW_AT_LOW_ADDRESS ? 2 : 0) \
- + (FL_MSB_AT_LOW_ADDRESS ? 0 : 1))
-#define I3 ((FL_MSL_AT_LOW_ADDRESS ? 0 : 4) + (FL_MSW_AT_LOW_ADDRESS ? 2 : 0) \
- + (FL_MSB_AT_LOW_ADDRESS ? 1 : 0))
-#define I4 ((FL_MSL_AT_LOW_ADDRESS ? 4 : 0) + (FL_MSW_AT_LOW_ADDRESS ? 0 : 2) \
- + (FL_MSB_AT_LOW_ADDRESS ? 0 : 1))
-#define I5 ((FL_MSL_AT_LOW_ADDRESS ? 4 : 0) + (FL_MSW_AT_LOW_ADDRESS ? 0 : 2) \
- + (FL_MSB_AT_LOW_ADDRESS ? 1 : 0))
-#define I6 ((FL_MSL_AT_LOW_ADDRESS ? 4 : 0) + (FL_MSW_AT_LOW_ADDRESS ? 2 : 0) \
- + (FL_MSB_AT_LOW_ADDRESS ? 0 : 1))
-#define I7 ((FL_MSL_AT_LOW_ADDRESS ? 4 : 0) + (FL_MSW_AT_LOW_ADDRESS ? 2 : 0) \
- + (FL_MSB_AT_LOW_ADDRESS ? 1 : 0))
-
-#ifndef USE_FLT
-static int
-float_cst(str, sz, buf)
- char *str, *buf;
- int sz;
-{
- int i;
- char *p;
- float fl;
- double f;
- double atof();
-
- if (sz!= 4 && sz!= 8) {
- return 1;
- }
- f = atof(str);
- if (sz == 4) {
- fl = f;
- p = (char *) &fl;
- }
- else {
- p = (char *) &f;
- }
- for (i = sz; i; i--) {
- *buf++ = *p++;
- }
- return 0;
-}
-#else /* USE_FLT */
-
-#include <ctype.h>
-#include <flt_arith.h>
-
-int
-float_cst(str, sz, buf)
- char *str, *buf;
- int sz;
-{
- int overflow = 0;
- flt_arith e;
-
- if (sz!= 4 && sz!= 8) {
- return 1;
- }
- flt_str2flt(str, &e);
-#ifdef IEEEFLOAT
- if (sz == 4) {
-#endif
-#ifdef PDPFLOAT
- e.flt_exp += 129;
-#else
- e.flt_exp += 127;
-#endif
- if (e.flt_mantissa.flt_h_32 == 0) e.flt_exp = 0;
-#ifdef IEEEFLOAT
- if (e.flt_mantissa.flt_h_32 & 0x80) {
- /* rounding */
- if ((e.flt_mantissa.flt_h_32 & 0xffffff00) == 0xffffff00) {
- e.flt_exp++;
- e.flt_mantissa.flt_h_32 = 0x80000000;
- }
- else {
- e.flt_mantissa.flt_h_32 += 0x80;
- }
- }
- if (e.flt_exp >= 255) {
- overflow = 1;
- e.flt_exp = 255;
- e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0;
- }
- if (e.flt_exp <= 0) {
- flt_b64_sft(&(e.flt_mantissa), 1);
- if (e.flt_exp < 0) {
- flt_b64_sft(&(e.flt_mantissa), -e.flt_exp);
- e.flt_exp = 0;
- }
- }
-#endif
-#ifndef IEEEFLOAT
- if (sz == 4 && (e.flt_mantissa.flt_h_32 & 0x80)) {
- /* rounding */
- if ((e.flt_mantissa.flt_h_32 & 0xffffff00) == 0xffffff00) {
- e.flt_exp++;
- e.flt_mantissa.flt_h_32 = 0x80000000;
- }
- else {
- e.flt_mantissa.flt_h_32 += 0x80;
- }
- }
- if (sz == 8 && (e.flt_mantissa.flt_l_32 & 0x80)) {
- /* rounding */
- if ((e.flt_mantissa.flt_l_32 & 0xffffff00) == 0xffffff00) {
- e.flt_mantissa.flt_l_32 = 0;
- if (e.flt_mantissa.flt_h_32 == 0xffffffff) {
- e.flt_exp++;
- e.flt_mantissa.flt_h_32 = 0x80000000;
- }
- else e.flt_mantissa.flt_h_32++;
- }
- else {
- e.flt_mantissa.flt_l_32 += 0x80;
- }
- }
- if (e.flt_exp > 255) {
- overflow = 1;
- e.flt_exp = 255;
- e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0xffffffff;
- }
-#endif
- buf[I0] = (e.flt_sign << 7) | (e.flt_exp >> 1);
- buf[I1] = ((e.flt_exp&1) << 7) |
- ((e.flt_mantissa.flt_h_32 & 0x7fffffff) >> 24);
- buf[I2] = e.flt_mantissa.flt_h_32 >> 16;
- buf[I3] = e.flt_mantissa.flt_h_32 >> 8;
-#ifndef IEEEFLOAT
- if (sz == 8) {
- buf[I4] = e.flt_mantissa.flt_h_32;
- buf[I5] = e.flt_mantissa.flt_l_32 >> 24;
- buf[I6] = e.flt_mantissa.flt_l_32 >> 16;
- buf[I7] = e.flt_mantissa.flt_l_32 >> 8;
- flt_b64_sft(&(e.flt_mantissa), -56);
- }
- else
-#endif
- flt_b64_sft(&(e.flt_mantissa), -24);
-#ifdef IEEEFLOAT
- }
- else {
- e.flt_exp += 1023;
- if (e.flt_mantissa.flt_h_32 == 0) e.flt_exp = 0;
- if (e.flt_mantissa.flt_l_32 & 0x400) {
- /* rounding */
- if ((e.flt_mantissa.flt_l_32 & 0xfffff800) == 0xfffff800) {
- e.flt_mantissa.flt_l_32 = 0;
- if (e.flt_mantissa.flt_h_32 == 0xffffffff) {
- e.flt_exp++;
- e.flt_mantissa.flt_h_32 = 0x80000000;
- }
- else e.flt_mantissa.flt_h_32++;
- }
- else {
- e.flt_mantissa.flt_l_32 += 0x400;
- }
- }
- if (e.flt_exp >= 2047) {
- overflow = 1;
- e.flt_exp = 2047;
- e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0;
- }
- if (e.flt_exp <= 0) {
- flt_b64_sft(&(e.flt_mantissa), 1);
- if (e.flt_exp < 0) {
- flt_b64_sft(&(e.flt_mantissa), -e.flt_exp);
- e.flt_exp = 0;
- }
- }
- buf[I0] = (e.flt_sign << 7) | (e.flt_exp >> 4);
- buf[I1] = ((e.flt_exp & 017)<< 4) | ((e.flt_mantissa.flt_h_32 >> 27) & 017);
- buf[I2] = e.flt_mantissa.flt_h_32 >> 19;
- buf[I3] = e.flt_mantissa.flt_h_32 >> 11;
- buf[I4] = e.flt_mantissa.flt_h_32 >> 3;
- buf[I5] = (e.flt_mantissa.flt_h_32 << 5) | ((e.flt_mantissa.flt_l_32 >> 27) & 037);
- buf[I6] = e.flt_mantissa.flt_l_32 >> 19;
- buf[I7] = e.flt_mantissa.flt_l_32 >> 11;
- flt_b64_sft(&(e.flt_mantissa), -53);
- }
-#endif
-#if ! FL_MSL_AT_LOW_ADDRESS
- if (sz == 4) {
- buf[I4] = buf[I0];
- buf[I5] = buf[I1];
- buf[I6] = buf[I2];
- buf[I7] = buf[I3];
- }
-#endif
- if (overflow) {
- return 2;
- }
- return 0;
-}
-#endif /* USE_FLT */
-
-#ifdef CODE_GENERATOR
-con_float()
-{
- char buf[8];
- int rval = float_cst(str, (int)argval, buf);
- int i;
-
- if (rval == 1) {
- fprintf(stderr,"float constant size = %d\n",(int)argval);
- fatal("bad fcon size");
- }
- fprintf(codefile,"!float %s sz %d\n", str, (int)argval);
- if (rval == 2) {
- fprintf(stderr, "Warning: overflow in floating point constant %s\n", str);
- }
- fprintf(codefile, ".data1 0%o", buf[0] & 0377);
- for (i = 1; i < (int)argval; i++) {
- fprintf(codefile, ",0%o", buf[i] & 0377);
- }
- putc('\n', codefile);
-}
-#endif /* CODE_GENERATOR */
-
-#ifdef CODE_EXPANDER
-con_float(str, argval)
- char *str;
- arith argval;
-{
- char buf[8];
- int rval = float_cst(str, (int)argval, buf);
- int i;
-
- if (rval == 1) {
- argval = 8;
- rval = float_cst(str, 8, buf);
- }
- for (i = 0; i < (int)argval; i++) {
- gen1(buf[i]);
- }
-}
-#endif /* CODE_EXPANDER */
public / ack.git / commitdiff