0,0 → 1,774 |
/* IEEE floating point support routines, for GDB, the GNU Debugger. |
Copyright 1991, 1994, 1999, 2000, 2003, 2005, 2006, 2010, 2012 |
Free Software Foundation, Inc. |
|
This file is part of GDB. |
|
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 2 of the License, or |
(at your option) any later version. |
|
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 this program; if not, write to the Free Software |
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
|
/* This is needed to pick up the NAN macro on some systems. */ |
#define _GNU_SOURCE |
|
#ifdef HAVE_CONFIG_H |
#include "config.h" |
#endif |
|
#include <math.h> |
|
#ifdef HAVE_STRING_H |
#include <string.h> |
#endif |
|
/* On some platforms, <float.h> provides DBL_QNAN. */ |
#ifdef STDC_HEADERS |
#include <float.h> |
#endif |
|
#include "ansidecl.h" |
#include "libiberty.h" |
#include "floatformat.h" |
|
#ifndef INFINITY |
#ifdef HUGE_VAL |
#define INFINITY HUGE_VAL |
#else |
#define INFINITY (1.0 / 0.0) |
#endif |
#endif |
|
#ifndef NAN |
#ifdef DBL_QNAN |
#define NAN DBL_QNAN |
#else |
#define NAN (0.0 / 0.0) |
#endif |
#endif |
|
static int mant_bits_set (const struct floatformat *, const unsigned char *); |
static unsigned long get_field (const unsigned char *, |
enum floatformat_byteorders, |
unsigned int, |
unsigned int, |
unsigned int); |
static int floatformat_always_valid (const struct floatformat *fmt, |
const void *from); |
|
static int |
floatformat_always_valid (const struct floatformat *fmt ATTRIBUTE_UNUSED, |
const void *from ATTRIBUTE_UNUSED) |
{ |
return 1; |
} |
|
/* The odds that CHAR_BIT will be anything but 8 are low enough that I'm not |
going to bother with trying to muck around with whether it is defined in |
a system header, what we do if not, etc. */ |
#define FLOATFORMAT_CHAR_BIT 8 |
|
/* floatformats for IEEE half, single and double, big and little endian. */ |
const struct floatformat floatformat_ieee_half_big = |
{ |
floatformat_big, 16, 0, 1, 5, 15, 31, 6, 10, |
floatformat_intbit_no, |
"floatformat_ieee_half_big", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ieee_half_little = |
{ |
floatformat_little, 16, 0, 1, 5, 15, 31, 6, 10, |
floatformat_intbit_no, |
"floatformat_ieee_half_little", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ieee_single_big = |
{ |
floatformat_big, 32, 0, 1, 8, 127, 255, 9, 23, |
floatformat_intbit_no, |
"floatformat_ieee_single_big", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ieee_single_little = |
{ |
floatformat_little, 32, 0, 1, 8, 127, 255, 9, 23, |
floatformat_intbit_no, |
"floatformat_ieee_single_little", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ieee_double_big = |
{ |
floatformat_big, 64, 0, 1, 11, 1023, 2047, 12, 52, |
floatformat_intbit_no, |
"floatformat_ieee_double_big", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ieee_double_little = |
{ |
floatformat_little, 64, 0, 1, 11, 1023, 2047, 12, 52, |
floatformat_intbit_no, |
"floatformat_ieee_double_little", |
floatformat_always_valid, |
NULL |
}; |
|
/* floatformat for IEEE double, little endian byte order, with big endian word |
ordering, as on the ARM. */ |
|
const struct floatformat floatformat_ieee_double_littlebyte_bigword = |
{ |
floatformat_littlebyte_bigword, 64, 0, 1, 11, 1023, 2047, 12, 52, |
floatformat_intbit_no, |
"floatformat_ieee_double_littlebyte_bigword", |
floatformat_always_valid, |
NULL |
}; |
|
/* floatformat for VAX. Not quite IEEE, but close enough. */ |
|
const struct floatformat floatformat_vax_f = |
{ |
floatformat_vax, 32, 0, 1, 8, 129, 0, 9, 23, |
floatformat_intbit_no, |
"floatformat_vax_f", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_vax_d = |
{ |
floatformat_vax, 64, 0, 1, 8, 129, 0, 9, 55, |
floatformat_intbit_no, |
"floatformat_vax_d", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_vax_g = |
{ |
floatformat_vax, 64, 0, 1, 11, 1025, 0, 12, 52, |
floatformat_intbit_no, |
"floatformat_vax_g", |
floatformat_always_valid, |
NULL |
}; |
|
static int floatformat_i387_ext_is_valid (const struct floatformat *fmt, |
const void *from); |
|
static int |
floatformat_i387_ext_is_valid (const struct floatformat *fmt, const void *from) |
{ |
/* In the i387 double-extended format, if the exponent is all ones, |
then the integer bit must be set. If the exponent is neither 0 |
nor ~0, the intbit must also be set. Only if the exponent is |
zero can it be zero, and then it must be zero. */ |
unsigned long exponent, int_bit; |
const unsigned char *ufrom = (const unsigned char *) from; |
|
exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize, |
fmt->exp_start, fmt->exp_len); |
int_bit = get_field (ufrom, fmt->byteorder, fmt->totalsize, |
fmt->man_start, 1); |
|
if ((exponent == 0) != (int_bit == 0)) |
return 0; |
else |
return 1; |
} |
|
const struct floatformat floatformat_i387_ext = |
{ |
floatformat_little, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64, |
floatformat_intbit_yes, |
"floatformat_i387_ext", |
floatformat_i387_ext_is_valid, |
NULL |
}; |
const struct floatformat floatformat_m68881_ext = |
{ |
/* Note that the bits from 16 to 31 are unused. */ |
floatformat_big, 96, 0, 1, 15, 0x3fff, 0x7fff, 32, 64, |
floatformat_intbit_yes, |
"floatformat_m68881_ext", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_i960_ext = |
{ |
/* Note that the bits from 0 to 15 are unused. */ |
floatformat_little, 96, 16, 17, 15, 0x3fff, 0x7fff, 32, 64, |
floatformat_intbit_yes, |
"floatformat_i960_ext", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_m88110_ext = |
{ |
floatformat_big, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64, |
floatformat_intbit_yes, |
"floatformat_m88110_ext", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_m88110_harris_ext = |
{ |
/* Harris uses raw format 128 bytes long, but the number is just an ieee |
double, and the last 64 bits are wasted. */ |
floatformat_big,128, 0, 1, 11, 0x3ff, 0x7ff, 12, 52, |
floatformat_intbit_no, |
"floatformat_m88110_ext_harris", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_arm_ext_big = |
{ |
/* Bits 1 to 16 are unused. */ |
floatformat_big, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64, |
floatformat_intbit_yes, |
"floatformat_arm_ext_big", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_arm_ext_littlebyte_bigword = |
{ |
/* Bits 1 to 16 are unused. */ |
floatformat_littlebyte_bigword, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64, |
floatformat_intbit_yes, |
"floatformat_arm_ext_littlebyte_bigword", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ia64_spill_big = |
{ |
floatformat_big, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64, |
floatformat_intbit_yes, |
"floatformat_ia64_spill_big", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ia64_spill_little = |
{ |
floatformat_little, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64, |
floatformat_intbit_yes, |
"floatformat_ia64_spill_little", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ia64_quad_big = |
{ |
floatformat_big, 128, 0, 1, 15, 16383, 0x7fff, 16, 112, |
floatformat_intbit_no, |
"floatformat_ia64_quad_big", |
floatformat_always_valid, |
NULL |
}; |
const struct floatformat floatformat_ia64_quad_little = |
{ |
floatformat_little, 128, 0, 1, 15, 16383, 0x7fff, 16, 112, |
floatformat_intbit_no, |
"floatformat_ia64_quad_little", |
floatformat_always_valid, |
NULL |
}; |
|
static int |
floatformat_ibm_long_double_is_valid (const struct floatformat *fmt, |
const void *from) |
{ |
const unsigned char *ufrom = (const unsigned char *) from; |
const struct floatformat *hfmt = fmt->split_half; |
long top_exp, bot_exp; |
int top_nan = 0; |
|
top_exp = get_field (ufrom, hfmt->byteorder, hfmt->totalsize, |
hfmt->exp_start, hfmt->exp_len); |
bot_exp = get_field (ufrom + 8, hfmt->byteorder, hfmt->totalsize, |
hfmt->exp_start, hfmt->exp_len); |
|
if ((unsigned long) top_exp == hfmt->exp_nan) |
top_nan = mant_bits_set (hfmt, ufrom); |
|
/* A NaN is valid with any low part. */ |
if (top_nan) |
return 1; |
|
/* An infinity, zero or denormal requires low part 0 (positive or |
negative). */ |
if ((unsigned long) top_exp == hfmt->exp_nan || top_exp == 0) |
{ |
if (bot_exp != 0) |
return 0; |
|
return !mant_bits_set (hfmt, ufrom + 8); |
} |
|
/* The top part is now a finite normal value. The long double value |
is the sum of the two parts, and the top part must equal the |
result of rounding the long double value to nearest double. Thus |
the bottom part must be <= 0.5ulp of the top part in absolute |
value, and if it is < 0.5ulp then the long double is definitely |
valid. */ |
if (bot_exp < top_exp - 53) |
return 1; |
if (bot_exp > top_exp - 53 && bot_exp != 0) |
return 0; |
if (bot_exp == 0) |
{ |
/* The bottom part is 0 or denormal. Determine which, and if |
denormal the first two set bits. */ |
int first_bit = -1, second_bit = -1, cur_bit; |
for (cur_bit = 0; (unsigned int) cur_bit < hfmt->man_len; cur_bit++) |
if (get_field (ufrom + 8, hfmt->byteorder, hfmt->totalsize, |
hfmt->man_start + cur_bit, 1)) |
{ |
if (first_bit == -1) |
first_bit = cur_bit; |
else |
{ |
second_bit = cur_bit; |
break; |
} |
} |
/* Bottom part 0 is OK. */ |
if (first_bit == -1) |
return 1; |
/* The real exponent of the bottom part is -first_bit. */ |
if (-first_bit < top_exp - 53) |
return 1; |
if (-first_bit > top_exp - 53) |
return 0; |
/* The bottom part is at least 0.5ulp of the top part. For this |
to be OK, the bottom part must be exactly 0.5ulp (i.e. no |
more bits set) and the top part must have last bit 0. */ |
if (second_bit != -1) |
return 0; |
return !get_field (ufrom, hfmt->byteorder, hfmt->totalsize, |
hfmt->man_start + hfmt->man_len - 1, 1); |
} |
else |
{ |
/* The bottom part is at least 0.5ulp of the top part. For this |
to be OK, it must be exactly 0.5ulp (i.e. no explicit bits |
set) and the top part must have last bit 0. */ |
if (get_field (ufrom, hfmt->byteorder, hfmt->totalsize, |
hfmt->man_start + hfmt->man_len - 1, 1)) |
return 0; |
return !mant_bits_set (hfmt, ufrom + 8); |
} |
} |
|
const struct floatformat floatformat_ibm_long_double_big = |
{ |
floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52, |
floatformat_intbit_no, |
"floatformat_ibm_long_double_big", |
floatformat_ibm_long_double_is_valid, |
&floatformat_ieee_double_big |
}; |
|
const struct floatformat floatformat_ibm_long_double_little = |
{ |
floatformat_little, 128, 0, 1, 11, 1023, 2047, 12, 52, |
floatformat_intbit_no, |
"floatformat_ibm_long_double_little", |
floatformat_ibm_long_double_is_valid, |
&floatformat_ieee_double_little |
}; |
|
|
#ifndef min |
#define min(a, b) ((a) < (b) ? (a) : (b)) |
#endif |
|
/* Return 1 if any bits are explicitly set in the mantissa of UFROM, |
format FMT, 0 otherwise. */ |
static int |
mant_bits_set (const struct floatformat *fmt, const unsigned char *ufrom) |
{ |
unsigned int mant_bits, mant_off; |
int mant_bits_left; |
|
mant_off = fmt->man_start; |
mant_bits_left = fmt->man_len; |
while (mant_bits_left > 0) |
{ |
mant_bits = min (mant_bits_left, 32); |
|
if (get_field (ufrom, fmt->byteorder, fmt->totalsize, |
mant_off, mant_bits) != 0) |
return 1; |
|
mant_off += mant_bits; |
mant_bits_left -= mant_bits; |
} |
return 0; |
} |
|
/* Extract a field which starts at START and is LEN bits long. DATA and |
TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */ |
static unsigned long |
get_field (const unsigned char *data, enum floatformat_byteorders order, |
unsigned int total_len, unsigned int start, unsigned int len) |
{ |
unsigned long result = 0; |
unsigned int cur_byte; |
int lo_bit, hi_bit, cur_bitshift = 0; |
int nextbyte = (order == floatformat_little) ? 1 : -1; |
|
/* Start is in big-endian bit order! Fix that first. */ |
start = total_len - (start + len); |
|
/* Start at the least significant part of the field. */ |
if (order == floatformat_little) |
cur_byte = start / FLOATFORMAT_CHAR_BIT; |
else |
cur_byte = (total_len - start - 1) / FLOATFORMAT_CHAR_BIT; |
|
lo_bit = start % FLOATFORMAT_CHAR_BIT; |
hi_bit = min (lo_bit + len, FLOATFORMAT_CHAR_BIT); |
|
do |
{ |
unsigned int shifted = *(data + cur_byte) >> lo_bit; |
unsigned int bits = hi_bit - lo_bit; |
unsigned int mask = (1 << bits) - 1; |
result |= (shifted & mask) << cur_bitshift; |
len -= bits; |
cur_bitshift += bits; |
cur_byte += nextbyte; |
lo_bit = 0; |
hi_bit = min (len, FLOATFORMAT_CHAR_BIT); |
} |
while (len != 0); |
|
return result; |
} |
|
/* Convert from FMT to a double. |
FROM is the address of the extended float. |
Store the double in *TO. */ |
|
void |
floatformat_to_double (const struct floatformat *fmt, |
const void *from, double *to) |
{ |
const unsigned char *ufrom = (const unsigned char *) from; |
double dto; |
long exponent; |
unsigned long mant; |
unsigned int mant_bits, mant_off; |
int mant_bits_left; |
|
/* Split values are not handled specially, since the top half has |
the correctly rounded double value (in the only supported case of |
split values). */ |
|
exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize, |
fmt->exp_start, fmt->exp_len); |
|
/* If the exponent indicates a NaN, we don't have information to |
decide what to do. So we handle it like IEEE, except that we |
don't try to preserve the type of NaN. FIXME. */ |
if ((unsigned long) exponent == fmt->exp_nan) |
{ |
int nan = mant_bits_set (fmt, ufrom); |
|
/* On certain systems (such as GNU/Linux), the use of the |
INFINITY macro below may generate a warning that can not be |
silenced due to a bug in GCC (PR preprocessor/11931). The |
preprocessor fails to recognise the __extension__ keyword in |
conjunction with the GNU/C99 extension for hexadecimal |
floating point constants and will issue a warning when |
compiling with -pedantic. */ |
if (nan) |
dto = NAN; |
else |
dto = INFINITY; |
|
if (get_field (ufrom, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1)) |
dto = -dto; |
|
*to = dto; |
|
return; |
} |
|
mant_bits_left = fmt->man_len; |
mant_off = fmt->man_start; |
dto = 0.0; |
|
/* Build the result algebraically. Might go infinite, underflow, etc; |
who cares. */ |
|
/* For denorms use minimum exponent. */ |
if (exponent == 0) |
exponent = 1 - fmt->exp_bias; |
else |
{ |
exponent -= fmt->exp_bias; |
|
/* If this format uses a hidden bit, explicitly add it in now. |
Otherwise, increment the exponent by one to account for the |
integer bit. */ |
|
if (fmt->intbit == floatformat_intbit_no) |
dto = ldexp (1.0, exponent); |
else |
exponent++; |
} |
|
while (mant_bits_left > 0) |
{ |
mant_bits = min (mant_bits_left, 32); |
|
mant = get_field (ufrom, fmt->byteorder, fmt->totalsize, |
mant_off, mant_bits); |
|
dto += ldexp ((double) mant, exponent - mant_bits); |
exponent -= mant_bits; |
mant_off += mant_bits; |
mant_bits_left -= mant_bits; |
} |
|
/* Negate it if negative. */ |
if (get_field (ufrom, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1)) |
dto = -dto; |
*to = dto; |
} |
|
static void put_field (unsigned char *, enum floatformat_byteorders, |
unsigned int, |
unsigned int, |
unsigned int, |
unsigned long); |
|
/* Set a field which starts at START and is LEN bits long. DATA and |
TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */ |
static void |
put_field (unsigned char *data, enum floatformat_byteorders order, |
unsigned int total_len, unsigned int start, unsigned int len, |
unsigned long stuff_to_put) |
{ |
unsigned int cur_byte; |
int lo_bit, hi_bit; |
int nextbyte = (order == floatformat_little) ? 1 : -1; |
|
/* Start is in big-endian bit order! Fix that first. */ |
start = total_len - (start + len); |
|
/* Start at the least significant part of the field. */ |
if (order == floatformat_little) |
cur_byte = start / FLOATFORMAT_CHAR_BIT; |
else |
cur_byte = (total_len - start - 1) / FLOATFORMAT_CHAR_BIT; |
|
lo_bit = start % FLOATFORMAT_CHAR_BIT; |
hi_bit = min (lo_bit + len, FLOATFORMAT_CHAR_BIT); |
|
do |
{ |
unsigned char *byte_ptr = data + cur_byte; |
unsigned int bits = hi_bit - lo_bit; |
unsigned int mask = ((1 << bits) - 1) << lo_bit; |
*byte_ptr = (*byte_ptr & ~mask) | ((stuff_to_put << lo_bit) & mask); |
stuff_to_put >>= bits; |
len -= bits; |
cur_byte += nextbyte; |
lo_bit = 0; |
hi_bit = min (len, FLOATFORMAT_CHAR_BIT); |
} |
while (len != 0); |
} |
|
/* The converse: convert the double *FROM to an extended float |
and store where TO points. Neither FROM nor TO have any alignment |
restrictions. */ |
|
void |
floatformat_from_double (const struct floatformat *fmt, |
const double *from, void *to) |
{ |
double dfrom; |
int exponent; |
double mant; |
unsigned int mant_bits, mant_off; |
int mant_bits_left; |
unsigned char *uto = (unsigned char *) to; |
|
dfrom = *from; |
memset (uto, 0, fmt->totalsize / FLOATFORMAT_CHAR_BIT); |
|
/* Split values are not handled specially, since a bottom half of |
zero is correct for any value representable as double (in the |
only supported case of split values). */ |
|
/* If negative, set the sign bit. */ |
if (dfrom < 0) |
{ |
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1, 1); |
dfrom = -dfrom; |
} |
|
if (dfrom == 0) |
{ |
/* 0.0. */ |
return; |
} |
|
if (dfrom != dfrom) |
{ |
/* NaN. */ |
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, |
fmt->exp_len, fmt->exp_nan); |
/* Be sure it's not infinity, but NaN value is irrelevant. */ |
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start, |
32, 1); |
return; |
} |
|
if (dfrom + dfrom == dfrom) |
{ |
/* This can only happen for an infinite value (or zero, which we |
already handled above). */ |
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, |
fmt->exp_len, fmt->exp_nan); |
return; |
} |
|
mant = frexp (dfrom, &exponent); |
if (exponent + fmt->exp_bias - 1 > 0) |
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, |
fmt->exp_len, exponent + fmt->exp_bias - 1); |
else |
{ |
/* Handle a denormalized number. FIXME: What should we do for |
non-IEEE formats? */ |
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, |
fmt->exp_len, 0); |
mant = ldexp (mant, exponent + fmt->exp_bias - 1); |
} |
|
mant_bits_left = fmt->man_len; |
mant_off = fmt->man_start; |
while (mant_bits_left > 0) |
{ |
unsigned long mant_long; |
mant_bits = mant_bits_left < 32 ? mant_bits_left : 32; |
|
mant *= 4294967296.0; |
mant_long = (unsigned long)mant; |
mant -= mant_long; |
|
/* If the integer bit is implicit, and we are not creating a |
denormalized number, then we need to discard it. */ |
if ((unsigned int) mant_bits_left == fmt->man_len |
&& fmt->intbit == floatformat_intbit_no |
&& exponent + fmt->exp_bias - 1 > 0) |
{ |
mant_long &= 0x7fffffff; |
mant_bits -= 1; |
} |
else if (mant_bits < 32) |
{ |
/* The bits we want are in the most significant MANT_BITS bits of |
mant_long. Move them to the least significant. */ |
mant_long >>= 32 - mant_bits; |
} |
|
put_field (uto, fmt->byteorder, fmt->totalsize, |
mant_off, mant_bits, mant_long); |
mant_off += mant_bits; |
mant_bits_left -= mant_bits; |
} |
} |
|
/* Return non-zero iff the data at FROM is a valid number in format FMT. */ |
|
int |
floatformat_is_valid (const struct floatformat *fmt, const void *from) |
{ |
return fmt->is_valid (fmt, from); |
} |
|
|
#ifdef IEEE_DEBUG |
|
#include <stdio.h> |
|
/* This is to be run on a host which uses IEEE floating point. */ |
|
void |
ieee_test (double n) |
{ |
double result; |
|
floatformat_to_double (&floatformat_ieee_double_little, &n, &result); |
if ((n != result && (! isnan (n) || ! isnan (result))) |
|| (n < 0 && result >= 0) |
|| (n >= 0 && result < 0)) |
printf ("Differ(to): %.20g -> %.20g\n", n, result); |
|
floatformat_from_double (&floatformat_ieee_double_little, &n, &result); |
if ((n != result && (! isnan (n) || ! isnan (result))) |
|| (n < 0 && result >= 0) |
|| (n >= 0 && result < 0)) |
printf ("Differ(from): %.20g -> %.20g\n", n, result); |
|
#if 0 |
{ |
char exten[16]; |
|
floatformat_from_double (&floatformat_m68881_ext, &n, exten); |
floatformat_to_double (&floatformat_m68881_ext, exten, &result); |
if (n != result) |
printf ("Differ(to+from): %.20g -> %.20g\n", n, result); |
} |
#endif |
|
#if IEEE_DEBUG > 1 |
/* This is to be run on a host which uses 68881 format. */ |
{ |
long double ex = *(long double *)exten; |
if (ex != n) |
printf ("Differ(from vs. extended): %.20g\n", n); |
} |
#endif |
} |
|
int |
main (void) |
{ |
ieee_test (0.0); |
ieee_test (0.5); |
ieee_test (1.1); |
ieee_test (256.0); |
ieee_test (0.12345); |
ieee_test (234235.78907234); |
ieee_test (-512.0); |
ieee_test (-0.004321); |
ieee_test (1.2E-70); |
ieee_test (1.2E-316); |
ieee_test (4.9406564584124654E-324); |
ieee_test (- 4.9406564584124654E-324); |
ieee_test (- 0.0); |
ieee_test (- INFINITY); |
ieee_test (- NAN); |
ieee_test (INFINITY); |
ieee_test (NAN); |
return 0; |
} |
#endif |