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