This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
-#include "param.h"
#include "ieee-float.h"
#include <math.h> /* ldexp */
void
ieee_extended_to_double (ext_format, from, to)
- struct ext_format *ext_format;
+ const struct ext_format *ext_format;
char *from;
double *to;
{
unsigned char *ufrom = (unsigned char *)from;
double dto;
- unsigned long mant0, mant1, exp;
+ unsigned long mant0, mant1, exponent;
- bcopy (&from[MANBYTE_H], &mant0, 4);
- bcopy (&from[MANBYTE_L], &mant1, 4);
- exp = ((ufrom[EXPBYTE_H] & (unsigned char)~SIGNMASK) << 8) | ufrom[EXPBYTE_L];
-
- if (exp == EXT_EXP_NAN) {
+ memcpy (&mant0, &from[MANBYTE_H], 4);
+ memcpy (&mant1, &from[MANBYTE_L], 4);
+ exponent = ((ufrom[EXPBYTE_H] & (unsigned char)~SIGNMASK) << 8) | ufrom[EXPBYTE_L];
+
+#if 0
+ /* We can't do anything useful with a NaN anyway, so ignore its
+ difference. It will end up as Infinity or something close. */
+ if (exponent == EXT_EXP_NAN) {
/* We have a NaN source. */
- dto = 0.123456789; /* Not much else useful to do */
- } else if (exp == 0 && mant0 == 0 && mant1 == 0) {
+ dto = 0.123456789; /* Not much else useful to do -- we don't know if
+ the host system even *has* NaNs, nor how to
+ generate an innocuous one if it does. */
+ } else
+#endif
+ if (exponent == 0 && mant0 == 0 && mant1 == 0) {
dto = 0;
} else {
/* Build the result algebraically. Might go infinite, underflow, etc;
who cares. */
mant0 |= 0x80000000;
- dto = ldexp ((double)mant0, exp - EXT_EXP_BIAS - 31);
- dto += ldexp ((double)mant1, exp - EXT_EXP_BIAS - 31 - 32);
+ dto = ldexp ((double)mant0, exponent - EXT_EXP_BIAS - 31);
+ dto += ldexp ((double)mant1, exponent - EXT_EXP_BIAS - 31 - 32);
+ if (ufrom[EXPBYTE_H] & SIGNMASK) /* If negative... */
+ dto = -dto; /* ...negate. */
}
*to = dto;
}
void
double_to_ieee_extended (ext_format, from, to)
- struct ext_format *ext_format;
+ const struct ext_format *ext_format;
double *from;
char *to;
{
double dfrom = *from;
unsigned long twolongs[2];
- unsigned long mant0, mant1, exp;
- unsigned char twobytes[2];
+ unsigned long mant0, mant1, exponent;
+ unsigned char tobytes[8];
- bzero (to, TOTALSIZE);
+ memset (to, 0, TOTALSIZE);
if (dfrom == 0)
return; /* Result is zero */
if (dfrom != dfrom) {
/* The following code assumes that the host has IEEE doubles. FIXME-someday.
It also assumes longs are 32 bits! FIXME-someday. */
- bcopy (from, twolongs, 8);
- bcopy (from, twobytes, 2);
+ memcpy (twolongs, from, 8);
+ memcpy (tobytes, from, 8);
#if HOST_BYTE_ORDER == BIG_ENDIAN
- exp = ((twobytes[1] & 0xF0) >> 4) | (twobytes[0] & 0x7F) << 4;
+ exponent = ((tobytes[1] & 0xF0) >> 4) | (tobytes[0] & 0x7F) << 4;
mant0 = (twolongs[0] << 11) | twolongs[1] >> 21;
mant1 = (twolongs[1] << 11);
#else
- exp = ((twobytes[0] & 0xF0) >> 4) | (twobytes[1] & 0x7F) << 4;
+ exponent = ((tobytes[6] & 0xF0) >> 4) | (tobytes[7] & 0x7F) << 4;
mant0 = (twolongs[1] << 11) | twolongs[0] >> 21;
mant1 = (twolongs[0] << 11);
#endif
/* Fiddle with leading 1-bit, implied in double, explicit in extended. */
- if (exp == 0)
+ if (exponent == 0)
mant0 &= 0x7FFFFFFF;
else
mant0 |= 0x80000000;
- exp -= DBL_EXP_BIAS; /* Get integer exp */
- exp += EXT_EXP_BIAS; /* Offset for extended *&/
+ exponent -= DBL_EXP_BIAS; /* Get integer exp */
+ exponent += EXT_EXP_BIAS; /* Offset for extended */
/* OK, now store it in extended format. */
- to[EXPBYTE_H] |= (unsigned char)(exp >> 8); /* Retain sign */
- to[EXPBYTE_L] = (unsigned char) exp;
+ to[EXPBYTE_H] |= (unsigned char)(exponent >> 8); /* Retain sign */
+ to[EXPBYTE_L] = (unsigned char) exponent;
- bcopy (&mant0, &to[MANBYTE_H], 4);
- bcopy (&mant1, &to[MANBYTE_L], 4);
+ memcpy (&to[MANBYTE_H], &mant0, 4);
+ memcpy (&to[MANBYTE_L], &mant1, 4);
}
-#ifdef DEBUG
+#ifdef IEEE_DEBUG
/* Test some numbers to see that extended/double conversion works for them. */
extern struct ext_format ext_format_68881;
for (i = 0; i < n; i++) {
- di.i[0] = random();
- di.i[1] = random();
- double_to_ieee_extended (ext_format_68881, &di.d, exten);
- ieee_extended_to_double (ext_format_68881, exten, &result);
+ di.i[0] = (random() << 16) | (random() & 0xffff);
+ di.i[1] = (random() << 16) | (random() & 0xffff);
+ double_to_ieee_extended (&ext_format_68881, &di.d, exten);
+ ieee_extended_to_double (&ext_format_68881, exten, &result);
if (di.d != result)
printf ("Differ: %x %x %g => %x %x %g\n", di.d, di.d, result, result);
}
projects / deliverable / binutils-gdb.git / blobdiff