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The list of changes is too long to fit in the cvs log (since it truncates!).

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Look at the ChangeLog for Apr 30 and May 1.
This commit is contained in:
Jim Kingdon
1991-05-02 04:28:42 +00:00
parent 04a0511c0a
commit e1ce8aa5ed
30 changed files with 393 additions and 145 deletions
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28
gdb/ieee-float.c
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@ -34,30 +34,30 @@ ieee_extended_to_double (ext_format, from, 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];
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 (exp == EXT_EXP_NAN) {
if (exponent == EXT_EXP_NAN) {
/* We have a NaN source. */
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 (exp == 0 && mant0 == 0 && mant1 == 0) {
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. */
}
@ -75,7 +75,7 @@ double_to_ieee_extended (ext_format, from, to)
{
double dfrom = *from;
unsigned long twolongs[2];
unsigned long mant0, mant1, exp;
unsigned long mant0, mant1, exponent;
unsigned char twobytes[2];
bzero (to, TOTALSIZE);
@ -97,27 +97,27 @@ double_to_ieee_extended (ext_format, from, to)
bcopy (from, twolongs, 8);
bcopy (from, twobytes, 2);
#if HOST_BYTE_ORDER == BIG_ENDIAN
exp = ((twobytes[1] & 0xF0) >> 4) | (twobytes[0] & 0x7F) << 4;
exponent = ((twobytes[1] & 0xF0) >> 4) | (twobytes[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 = ((twobytes[0] & 0xF0) >> 4) | (twobytes[1] & 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);