AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-09 23:00:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

PowerPC floating point little-endian [1 of 15]

Browse Source 
http://sourceware.org/ml/libc-alpha/2013-08/msg00081.html

This is the first of a series of patches to ban ieee854_long_double
and the ieee854_long_double macros when using IBM long double.  union
ieee854_long_double just isn't correct for IBM long double, especially
when little-endian, and pretending it is OK has allowed a number of
bugs to remain undetected in sysdeps/ieee754/ldbl-128ibm/.

This changes the few places in generic code that use it.

	* stdio-common/printf_size.c (__printf_size): Don't use
	union ieee854_long_double in fpnum union.
	* stdio-common/printf_fphex.c (__printf_fphex): Likewise.  Use
	signbit macro to retrieve sign from long double.
	* stdio-common/printf_fp.c (___printf_fp): Use signbit macro to
	retrieve sign from long double.
	* sysdeps/ieee754/ldbl-128ibm/printf_fphex.c: Adjust for fpnum change.
	* sysdeps/ieee754/ldbl-128/printf_fphex.c: Likewise.
	* sysdeps/ieee754/ldbl-96/printf_fphex.c: Likewise.
	* sysdeps/x86_64/fpu/printf_fphex.c: Likewise.
	* math/test-misc.c (main): Don't use union ieee854_long_double.
ports/
	* sysdeps/ia64/fpu/printf_fphex.c: Adjust for fpnum change.
This commit is contained in:
Alan Modra 2013-08-17 18:21:58 +09:30
parent 4cf69995e2
commit 1b6adf888d
11 changed files with 131 additions and 250 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ChangeLog
View File

@ -1,3 +1,17 @@
2013-10-04 Alan Modra <amodra@gmail.com>
* stdio-common/printf_size.c (__printf_size): Don't use
union ieee854_long_double in fpnum union.
* stdio-common/printf_fphex.c (__printf_fphex): Likewise. Use
signbit macro to retrieve sign from long double.
* stdio-common/printf_fp.c (___printf_fp): Use signbit macro to
retrieve sign from long double.
* sysdeps/ieee754/ldbl-128ibm/printf_fphex.c: Adjust for fpnum change.
* sysdeps/ieee754/ldbl-128/printf_fphex.c: Likewise.
* sysdeps/ieee754/ldbl-96/printf_fphex.c: Likewise.
* sysdeps/x86_64/fpu/printf_fphex.c: Likewise.
* math/test-misc.c (main): Don't use union ieee854_long_double.
2013-10-04 Alan Modra <amodra@gmail.com>
[BZ #15680]

289
math/test-misc.c
View File

@ -722,300 +722,161 @@ main (void)
#ifndef NO_LONG_DOUBLE
{
union ieee854_long_double v1;
union ieee854_long_double v2;
long double ld;
long double v1, v2;
v1.d = ld = LDBL_MIN;
if (fpclassify (ld) != FP_NORMAL)
v1 = LDBL_MIN;
if (fpclassify (v1) != FP_NORMAL)
{
printf ("fpclassify (LDBL_MIN) failed: %d\n", fpclassify (ld));
printf ("fpclassify (LDBL_MIN) failed: %d (%La)\n",
fpclassify (v1), v1);
result = 1;
}
ld = nextafterl (ld, LDBL_MIN / 2.0);
if (fpclassify (ld) != FP_SUBNORMAL)
v2 = nextafterl (v1, LDBL_MIN / 2.0);
if (fpclassify (v2) != FP_SUBNORMAL)
{
printf ("fpclassify (LDBL_MIN-epsilon) failed: %d (%La)\n",
fpclassify (ld), ld);
fpclassify (v2), v2);
result = 1;
}
v2.d = ld = nextafterl (ld, LDBL_MIN);
if (fpclassify (ld) != FP_NORMAL)
v2 = nextafterl (v2, LDBL_MIN);
if (fpclassify (v2) != FP_NORMAL)
{
printf ("fpclassify (LDBL_MIN-epsilon+epsilon) failed: %d (%La)\n",
fpclassify (ld), ld);
fpclassify (v2), v2);
result = 1;
}
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("LDBL_MIN: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
{
printf ("LDBL_MIN: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("LDBL_MIN: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (v1.ieee.negative != v2.ieee.negative)
{
printf ("LDBL_MIN: negative differs: %d vs %d\n",
v1.ieee.negative, v2.ieee.negative);
printf ("LDBL_MIN-epsilon+epsilon != LDBL_MIN: %La vs %La\n", v2, v1);
result = 1;
}
v1.d = ld = -LDBL_MIN;
if (fpclassify (ld) != FP_NORMAL)
v1 = -LDBL_MIN;
if (fpclassify (v1) != FP_NORMAL)
{
printf ("fpclassify (-LDBL_MIN) failed: %d\n", fpclassify (ld));
printf ("fpclassify (-LDBL_MIN) failed: %d (%La)\n",
fpclassify (v1), v1);
result = 1;
}
ld = nextafterl (ld, -LDBL_MIN / 2.0);
if (fpclassify (ld) != FP_SUBNORMAL)
v2 = nextafterl (v1, -LDBL_MIN / 2.0);
if (fpclassify (v2) != FP_SUBNORMAL)
{
printf ("fpclassify (-LDBL_MIN-epsilon) failed: %d (%La)\n",
fpclassify (ld), ld);
fpclassify (v2), v2);
result = 1;
}
v2.d = ld = nextafterl (ld, -LDBL_MIN);
if (fpclassify (ld) != FP_NORMAL)
v2 = nextafterl (v2, -LDBL_MIN);
if (fpclassify (v2) != FP_NORMAL)
{
printf ("fpclassify (-LDBL_MIN-epsilon+epsilon) failed: %d (%La)\n",
fpclassify (ld), ld);
fpclassify (v2), v2);
result = 1;
}
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("-LDBL_MIN: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
{
printf ("-LDBL_MIN: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("-LDBL_MIN: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (v1.ieee.negative != v2.ieee.negative)
{
printf ("-LDBL_MIN: negative differs: %d vs %d\n",
v1.ieee.negative, v2.ieee.negative);
printf ("-LDBL_MIN-epsilon+epsilon != -LDBL_MIN: %La vs %La\n", v2, v1);
result = 1;
}
ld = LDBL_MAX;
if (fpclassify (ld) != FP_NORMAL)
v1 = LDBL_MAX;
if (fpclassify (v1) != FP_NORMAL)
{
printf ("fpclassify (LDBL_MAX) failed: %d\n", fpclassify (ld));
printf ("fpclassify (LDBL_MAX) failed: %d (%La)\n",
fpclassify (v1), v1);
result = 1;
}
ld = nextafterl (ld, INFINITY);
if (fpclassify (ld) != FP_INFINITE)
v2 = nextafterl (v1, INFINITY);
if (fpclassify (v2) != FP_INFINITE)
{
printf ("fpclassify (LDBL_MAX+epsilon) failed: %d\n", fpclassify (ld));
printf ("fpclassify (LDBL_MAX+epsilon) failed: %d (%La)\n",
fpclassify (v2), v2);
result = 1;
}
ld = -LDBL_MAX;
if (fpclassify (ld) != FP_NORMAL)
v1 = -LDBL_MAX;
if (fpclassify (v1) != FP_NORMAL)
{
printf ("fpclassify (-LDBL_MAX) failed: %d\n", fpclassify (ld));
printf ("fpclassify (-LDBL_MAX) failed: %d (%La)\n",
fpclassify (v1), v1);
result = 1;
}
ld = nextafterl (ld, -INFINITY);
if (fpclassify (ld) != FP_INFINITE)
v2 = nextafterl (v1, -INFINITY);
if (fpclassify (v2) != FP_INFINITE)
{
printf ("fpclassify (-LDBL_MAX-epsilon) failed: %d\n",
fpclassify (ld));
printf ("fpclassify (-LDBL_MAX-epsilon) failed: %d (%La)\n",
fpclassify (v2), v2);
result = 1;
}
v1.d = ld = 0.0625;
ld = nextafterl (ld, 0.0);
v2.d = ld = nextafterl (ld, 1.0);
v1 = 0.0625;
v2 = nextafterl (v1, 0.0);
v2 = nextafterl (v2, 1.0);
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("0.0625L down: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
{
printf ("0.0625L down: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("0.0625L down: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (v1.ieee.negative != v2.ieee.negative)
{
printf ("0.0625L down: negative differs: %d vs %d\n",
v1.ieee.negative, v2.ieee.negative);
printf ("0.0625L-epsilon+epsilon != 0.0625L: %La vs %La\n", v2, v1);
result = 1;
}
v1.d = ld = 0.0625;
ld = nextafterl (ld, 1.0);
v2.d = ld = nextafterl (ld, 0.0);
v1 = 0.0625;
v2 = nextafterl (v1, 1.0);
v2 = nextafterl (v2, 0.0);
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("0.0625L up: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
{
printf ("0.0625L up: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("0.0625L up: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (v1.ieee.negative != v2.ieee.negative)
{
printf ("0.0625L up: negative differs: %d vs %d\n",
v1.ieee.negative, v2.ieee.negative);
printf ("0.0625L+epsilon-epsilon != 0.0625L: %La vs %La\n", v2, v1);
result = 1;
}
v1.d = ld = -0.0625;
ld = nextafterl (ld, 0.0);
v2.d = ld = nextafterl (ld, -1.0);
v1 = -0.0625;
v2 = nextafterl (v1, 0.0);
v2 = nextafterl (v2, -1.0);
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("-0.0625L up: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
{
printf ("-0.0625L up: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("-0.0625L up: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (v1.ieee.negative != v2.ieee.negative)
{
printf ("-0.0625L up: negative differs: %d vs %d\n",
v1.ieee.negative, v2.ieee.negative);
printf ("-0.0625L+epsilon-epsilon != -0.0625L: %La vs %La\n", v2, v1);
result = 1;
}
v1.d = ld = -0.0625;
ld = nextafterl (ld, -1.0);
v2.d = ld = nextafterl (ld, 0.0);
v1 = -0.0625;
v2 = nextafterl (v1, -1.0);
v2 = nextafterl (v2, 0.0);
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("-0.0625L down: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
{
printf ("-0.0625L down: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("-0.0625L down: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (v1.ieee.negative != v2.ieee.negative)
{
printf ("-0.0625L down: negative differs: %d vs %d\n",
v1.ieee.negative, v2.ieee.negative);
printf ("-0.0625L-epsilon+epsilon != -0.0625L: %La vs %La\n", v2, v1);
result = 1;
}
v1.d = ld = 0.0;
ld = nextafterl (ld, 1.0);
v2.d = nextafterl (ld, -1.0);
v1 = 0.0;
v2 = nextafterl (v1, 1.0);
v2 = nextafterl (v2, -1.0);
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("0.0L up: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
printf ("0.0+epsilon-epsilon != 0.0L: %La vs %La\n", v2, v1);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
if (signbit (v2))
{
printf ("0.0L up: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("0.0L up: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (0 != v2.ieee.negative)
{
printf ("0.0L up: negative differs: 0 vs %d\n",
v2.ieee.negative);
printf ("0.0+epsilon-epsilon is negative\n");
result = 1;
}
v1.d = ld = 0.0;
ld = nextafterl (ld, -1.0);
v2.d = nextafterl (ld, 1.0);
v1 = 0.0;
v2 = nextafterl (v1, -1.0);
v2 = nextafterl (v2, 1.0);
if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
if (v1 != v2)
{
printf ("0.0L down: mantissa0 differs: %8x vs %8x\n",
v1.ieee.mantissa0, v2.ieee.mantissa0);
printf ("0.0-epsilon+epsilon != 0.0L: %La vs %La\n", v2, v1);
result = 1;
}
if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
if (!signbit (v2))
{
printf ("0.0L down: mantissa1 differs: %8x vs %8x\n",
v1.ieee.mantissa1, v2.ieee.mantissa1);
result = 1;
}
if (v1.ieee.exponent != v2.ieee.exponent)
{
printf ("0.0L down: exponent differs: %4x vs %4x\n",
v1.ieee.exponent, v2.ieee.exponent);
result = 1;
}
if (1 != v2.ieee.negative)
{
printf ("0.0L down: negative differs: 1 vs %d\n",
v2.ieee.negative);
printf ("0.0-epsilon+epsilon is positive\n");
result = 1;
}

4
ports/ChangeLog
View File

@ -1,3 +1,7 @@
2013-19-04 Alan Modra <amodra@gmail.com>
* sysdeps/ia64/fpu/printf_fphex.c: Adjust for fpnum change.
2013-09-02 Mike Frysinger <vapier@gentoo.org>
* sysdeps/unix/sysv/linux/hppa/syscalls.list (fanotify_mark): New

10
ports/sysdeps/ia64/fpu/printf_fphex.c
View File

@ -25,9 +25,11 @@ do { \
/* The "strange" 80 bit format on ia64 has an explicit \
leading digit in the 64 bit mantissa. */ \
unsigned long long int num; \
union ieee854_long_double u; \
u.d = fpnum.ldbl; \
\
num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32 \
| fpnum.ldbl.ieee.mantissa1); \
num = (((unsigned long long int) u.ieee.mantissa0) << 32 \
| u.ieee.mantissa1); \
\
zero_mantissa = num == 0; \
\
@ -49,8 +51,8 @@ do { \
\
/* We have 3 bits from the mantissa in the leading nibble. \
Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
exponent = fpnum.ldbl.ieee.exponent; \
\
exponent = u.ieee.exponent; \
\
if (exponent == 0) \
{ \
if (zero_mantissa) \

3
stdio-common/printf_fp.c
View File

@ -332,8 +332,7 @@ ___printf_fp (FILE *fp,
int res;
if (__isnanl (fpnum.ldbl))
{
union ieee854_long_double u = { .d = fpnum.ldbl };
is_neg = u.ieee.negative != 0;
is_neg = signbit (fpnum.ldbl);
if (isupper (info->spec))
{
special = "NAN";

14
stdio-common/printf_fphex.c
View File

@ -93,7 +93,7 @@ __printf_fphex (FILE *fp,
union
{
union ieee754_double dbl;
union ieee854_long_double ldbl;
long double ldbl;
}
fpnum;
@ -162,12 +162,11 @@ __printf_fphex (FILE *fp,
#ifndef __NO_LONG_DOUBLE_MATH
if (info->is_long_double && sizeof (long double) > sizeof (double))
{
fpnum.ldbl.d = *(const long double *) args[0];
fpnum.ldbl = *(const long double *) args[0];
/* Check for special values: not a number or infinity. */
if (__isnanl (fpnum.ldbl.d))
if (__isnanl (fpnum.ldbl))
{
negative = fpnum.ldbl.ieee.negative != 0;
if (isupper (info->spec))
{
special = "NAN";
@ -181,8 +180,7 @@ __printf_fphex (FILE *fp,
}
else
{
int res = __isinfl (fpnum.ldbl.d);
if (res)
if (__isinfl (fpnum.ldbl))
{
if (isupper (info->spec))
{
@ -194,11 +192,9 @@ __printf_fphex (FILE *fp,
special = "inf";
wspecial = L"inf";
}
negative = res < 0;
}
else
negative = signbit (fpnum.ldbl.d);
}
negative = signbit (fpnum.ldbl);
}
else
#endif /* no long double */

12
stdio-common/printf_size.c
View File

@ -103,7 +103,7 @@ __printf_size (FILE *fp, const struct printf_info *info,
union
{
union ieee754_double dbl;
union ieee854_long_double ldbl;
long double ldbl;
}
fpnum;
const void *ptr = &fpnum;
@ -123,25 +123,25 @@ __printf_size (FILE *fp, const struct printf_info *info,
#ifndef __NO_LONG_DOUBLE_MATH
if (info->is_long_double && sizeof (long double) > sizeof (double))
{
fpnum.ldbl.d = *(const long double *) args[0];
fpnum.ldbl = *(const long double *) args[0];
/* Check for special values: not a number or infinity. */
if (__isnanl (fpnum.ldbl.d))
if (__isnanl (fpnum.ldbl))
{
special = "nan";
wspecial = L"nan";
// fpnum_sign = 0; Already zero
}
else if ((res = __isinfl (fpnum.ldbl.d)))
else if ((res = __isinfl (fpnum.ldbl)))
{
fpnum_sign = res;
special = "inf";
wspecial = L"inf";
}
else
while (fpnum.ldbl.d >= divisor && tag[1] != '\0')
while (fpnum.ldbl >= divisor && tag[1] != '\0')
{
fpnum.ldbl.d /= divisor;
fpnum.ldbl /= divisor;
++tag;
}
}

14
sysdeps/ieee754/ldbl-128/printf_fphex.c
View File

@ -24,13 +24,15 @@ do { \
digits we use only the implicit digits for the number before \
the decimal point. */ \
unsigned long long int num0, num1; \
union ieee854_long_double u; \
u.d = fpnum.ldbl; \
\
assert (sizeof (long double) == 16); \
\
num0 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32 \
| fpnum.ldbl.ieee.mantissa1); \
num1 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa2) << 32 \
| fpnum.ldbl.ieee.mantissa3); \
num0 = (((unsigned long long int) u.ieee.mantissa0) << 32 \
| u.ieee.mantissa1); \
num1 = (((unsigned long long int) u.ieee.mantissa2) << 32 \
| u.ieee.mantissa3); \
\
zero_mantissa = (num0|num1) == 0; \
\
@ -75,9 +77,9 @@ do { \
*--wnumstr = L'0'; \
} \
\
leading = fpnum.ldbl.ieee.exponent == 0 ? '0' : '1'; \
leading = u.ieee.exponent == 0 ? '0' : '1'; \
\
exponent = fpnum.ldbl.ieee.exponent; \
exponent = u.ieee.exponent; \
\
if (exponent == 0) \
{ \

4
sysdeps/ieee754/ldbl-128ibm/printf_fphex.c
View File

@ -27,14 +27,14 @@ do { \
unsigned long long hi, lo; \
int ediff; \
union ibm_extended_long_double u; \
u.ld = fpnum.ldbl.d; \
u.ld = fpnum.ldbl; \
\
assert (sizeof (long double) == 16); \
\
lo = ((long long)u.d[1].ieee.mantissa0 << 32) | u.d[1].ieee.mantissa1; \
hi = ((long long)u.d[0].ieee.mantissa0 << 32) | u.d[0].ieee.mantissa1; \
lo <<= 7; /* pre-shift lo to match ieee854. */ \
/* If the lower double is not a denomal or zero then set the hidden \
/* If the lower double is not a denormal or zero then set the hidden \
53rd bit. */ \
if (u.d[1].ieee.exponent != 0) \
lo |= (1ULL << (52 + 7)); \

8
sysdeps/ieee754/ldbl-96/printf_fphex.c
View File

@ -25,11 +25,13 @@ do { \
/* The "strange" 80 bit format on ix86 and m68k has an explicit \
leading digit in the 64 bit mantissa. */ \
unsigned long long int num; \
union ieee854_long_double u; \
u.d = fpnum.ldbl; \
\
assert (sizeof (long double) == 12); \
\
num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32 \
| fpnum.ldbl.ieee.mantissa1); \
num = (((unsigned long long int) u.ieee.mantissa0) << 32 \
| u.ieee.mantissa1); \
\
zero_mantissa = num == 0; \
\
@ -62,7 +64,7 @@ do { \
\
/* We have 3 bits from the mantissa in the leading nibble. \
Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
exponent = fpnum.ldbl.ieee.exponent; \
exponent = u.ieee.exponent; \
\
if (exponent == 0) \
{ \

9
sysdeps/x86_64/fpu/printf_fphex.c
View File

@ -25,10 +25,11 @@ do { \
/* The "strange" 80 bit format on ix86 and m68k has an explicit \
leading digit in the 64 bit mantissa. */ \
unsigned long long int num; \
union ieee854_long_double u; \
u.d = fpnum.ldbl; \
\
\
num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32 \
| fpnum.ldbl.ieee.mantissa1); \
num = (((unsigned long long int) u.ieee.mantissa0) << 32 \
| u.ieee.mantissa1); \
\
zero_mantissa = num == 0; \
\
@ -61,7 +62,7 @@ do { \
\
/* We have 3 bits from the mantissa in the leading nibble. \
Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
exponent = fpnum.ldbl.ieee.exponent; \
exponent = u.ieee.exponent; \
\
if (exponent == 0) \
{ \