-/* This is a software floating point library which can be used instead of
- the floating point routines in libgcc1.c for targets without hardware
- floating point.
- Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001
- Free Software Foundation, Inc.
+/* This is a software floating point library which can be used
+ for targets without hardware floating point.
+ Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003,
+ 2004, 2005 Free Software Foundation, Inc.
-This file 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, or (at your option) any
-later version.
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
-compiled version of this file with other programs, and to distribute
-those programs without any restriction coming from the use of this
-file. (The General Public License restrictions do apply in other
-respects; for example, they cover modification of the file, and
-distribution when not linked into another program.)
-
-This file 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.
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file. (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+GCC 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; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
-
-/* As a special exception, if you link this library with other files,
- some of which are compiled with GCC, to produce an executable,
- this library does not by itself cause the resulting executable
- to be covered by the GNU General Public License.
- This exception does not however invalidate any other reasons why
- the executable file might be covered by the GNU General Public License. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* This implements IEEE 754 format arithmetic, but does not provide a
mechanism for setting the rounding mode, or for generating or handling
/* The intended way to use this file is to make two copies, add `#define FLOAT'
to one copy, then compile both copies and add them to libgcc.a. */
-#include "fp-bit.h"
+#include "tconfig.h"
+#include "coretypes.h"
#include "tm.h"
+#include "config/fp-bit.h"
-/* The following macros can be defined to change the behaviour of this file:
+/* The following macros can be defined to change the behavior of this file:
FLOAT: Implement a `float', aka SFmode, fp library. If this is not
defined, then this file implements a `double', aka DFmode, fp library.
FLOAT_ONLY: Used with FLOAT, to implement a `float' only library, i.e.
CMPtype: Specify the type that floating point compares should return.
This defaults to SItype, aka int.
US_SOFTWARE_GOFAST: This makes all entry points use the same names as the
- US Software goFast library. If this is not defined, the entry points use
- the same names as libgcc1.c.
+ US Software goFast library.
_DEBUG_BITFLOAT: This makes debugging the code a little easier, by adding
two integers to the FLO_union_type.
NO_DENORMALS: Disable handling of denormals.
are referenced from within libc, since libgcc goes before and after the
system library. */
+#ifdef DECLARE_LIBRARY_RENAMES
+ DECLARE_LIBRARY_RENAMES
+#endif
+
#ifdef EXTENDED_FLOAT_STUBS
-__truncxfsf2 (){ abort(); }
-__extendsfxf2 (){ abort(); }
-__addxf3 (){ abort(); }
-__divxf3 (){ abort(); }
-__eqxf2 (){ abort(); }
-__extenddfxf2 (){ abort(); }
-__gtxf2 (){ abort(); }
-__lexf2 (){ abort(); }
-__ltxf2 (){ abort(); }
-__mulxf3 (){ abort(); }
-__negxf2 (){ abort(); }
-__nexf2 (){ abort(); }
-__subxf3 (){ abort(); }
-__truncxfdf2 (){ abort(); }
-
-__trunctfsf2 (){ abort(); }
-__extendsftf2 (){ abort(); }
-__addtf3 (){ abort(); }
-__divtf3 (){ abort(); }
-__eqtf2 (){ abort(); }
-__extenddftf2 (){ abort(); }
-__gttf2 (){ abort(); }
-__letf2 (){ abort(); }
-__lttf2 (){ abort(); }
-__multf3 (){ abort(); }
-__negtf2 (){ abort(); }
-__netf2 (){ abort(); }
-__subtf3 (){ abort(); }
-__trunctfdf2 (){ abort(); }
-__gexf2 (){ abort(); }
-__fixxfsi (){ abort(); }
-__floatsixf (){ abort(); }
+extern void abort (void);
+void __extendsfxf2 (void) { abort(); }
+void __extenddfxf2 (void) { abort(); }
+void __truncxfdf2 (void) { abort(); }
+void __truncxfsf2 (void) { abort(); }
+void __fixxfsi (void) { abort(); }
+void __floatsixf (void) { abort(); }
+void __addxf3 (void) { abort(); }
+void __subxf3 (void) { abort(); }
+void __mulxf3 (void) { abort(); }
+void __divxf3 (void) { abort(); }
+void __negxf2 (void) { abort(); }
+void __eqxf2 (void) { abort(); }
+void __nexf2 (void) { abort(); }
+void __gtxf2 (void) { abort(); }
+void __gexf2 (void) { abort(); }
+void __lexf2 (void) { abort(); }
+void __ltxf2 (void) { abort(); }
+
+void __extendsftf2 (void) { abort(); }
+void __extenddftf2 (void) { abort(); }
+void __trunctfdf2 (void) { abort(); }
+void __trunctfsf2 (void) { abort(); }
+void __fixtfsi (void) { abort(); }
+void __floatsitf (void) { abort(); }
+void __addtf3 (void) { abort(); }
+void __subtf3 (void) { abort(); }
+void __multf3 (void) { abort(); }
+void __divtf3 (void) { abort(); }
+void __negtf2 (void) { abort(); }
+void __eqtf2 (void) { abort(); }
+void __netf2 (void) { abort(); }
+void __gttf2 (void) { abort(); }
+void __getf2 (void) { abort(); }
+void __letf2 (void) { abort(); }
+void __lttf2 (void) { abort(); }
#else /* !EXTENDED_FLOAT_STUBS, rest of file */
/* IEEE "special" number predicates */
const fp_number_type __thenan_sf = { CLASS_SNAN, 0, 0, {(fractype) 0} };
#elif defined L_thenan_df
const fp_number_type __thenan_df = { CLASS_SNAN, 0, 0, {(fractype) 0} };
+#elif defined L_thenan_tf
+const fp_number_type __thenan_tf = { CLASS_SNAN, 0, 0, {(fractype) 0} };
+#elif defined TFLOAT
+extern const fp_number_type __thenan_tf;
#elif defined FLOAT
extern const fp_number_type __thenan_sf;
#else
static fp_number_type *
nan (void)
{
- /* Discard the const qualifier... */
-#ifdef FLOAT
+ /* Discard the const qualifier... */
+#ifdef TFLOAT
+ return (fp_number_type *) (& __thenan_tf);
+#elif defined FLOAT
return (fp_number_type *) (& __thenan_sf);
#else
return (fp_number_type *) (& __thenan_df);
static int
isnan ( fp_number_type * x)
{
- return x->class == CLASS_SNAN || x->class == CLASS_QNAN;
+ return __builtin_expect (x->class == CLASS_SNAN || x->class == CLASS_QNAN,
+ 0);
}
INLINE
static int
isinf ( fp_number_type * x)
{
- return x->class == CLASS_INFINITY;
+ return __builtin_expect (x->class == CLASS_INFINITY, 0);
}
#endif /* NO_NANS */
x->sign = !x->sign;
}
+/* Count leading zeroes in N. */
+INLINE
+static int
+clzusi (USItype n)
+{
+ extern int __clzsi2 (USItype);
+ if (sizeof (USItype) == sizeof (unsigned int))
+ return __builtin_clz (n);
+ else if (sizeof (USItype) == sizeof (unsigned long))
+ return __builtin_clzl (n);
+ else if (sizeof (USItype) == sizeof (unsigned long long))
+ return __builtin_clzll (n);
+ else
+ return __clzsi2 (n);
+}
+
extern FLO_type pack_d ( fp_number_type * );
-#if defined(L_pack_df) || defined(L_pack_sf)
+#if defined(L_pack_df) || defined(L_pack_sf) || defined(L_pack_tf)
FLO_type
pack_d ( fp_number_type * src)
{
int sign = src->sign;
int exp = 0;
- if (isnan (src))
+ if (LARGEST_EXPONENT_IS_NORMAL (FRAC_NBITS) && (isnan (src) || isinf (src)))
+ {
+ /* We can't represent these values accurately. By using the
+ largest possible magnitude, we guarantee that the conversion
+ of infinity is at least as big as any finite number. */
+ exp = EXPMAX;
+ fraction = ((fractype) 1 << FRACBITS) - 1;
+ }
+ else if (isnan (src))
{
exp = EXPMAX;
if (src->class == CLASS_QNAN || 1)
{
+#ifdef QUIET_NAN_NEGATED
+ fraction |= QUIET_NAN - 1;
+#else
fraction |= QUIET_NAN;
+#endif
}
}
else if (isinf (src))
}
else
{
- if (src->normal_exp < NORMAL_EXPMIN)
+ if (__builtin_expect (src->normal_exp < NORMAL_EXPMIN, 0))
{
+#ifdef NO_DENORMALS
+ /* Go straight to a zero representation if denormals are not
+ supported. The denormal handling would be harmless but
+ isn't unnecessary. */
+ exp = 0;
+ fraction = 0;
+#else /* NO_DENORMALS */
/* This number's exponent is too low to fit into the bits
available in the number, so we'll store 0 in the exponent and
shift the fraction to the right to make up for it. */
}
else
{
- int lowbit = (fraction & ((1 << shift) - 1)) ? 1 : 0;
+ int lowbit = (fraction & (((fractype)1 << shift) - 1)) ? 1 : 0;
fraction = (fraction >> shift) | lowbit;
}
if ((fraction & GARDMASK) == GARDMSB)
exp += 1;
}
fraction >>= NGARDS;
+#endif /* NO_DENORMALS */
}
- else if (src->normal_exp > EXPBIAS)
+ else if (!LARGEST_EXPONENT_IS_NORMAL (FRAC_NBITS)
+ && __builtin_expect (src->normal_exp > EXPBIAS, 0))
{
exp = EXPMAX;
fraction = 0;
else
{
exp = src->normal_exp + EXPBIAS;
- /* IF the gard bits are the all zero, but the first, then we're
- half way between two numbers, choose the one which makes the
- lsb of the answer 0. */
- if ((fraction & GARDMASK) == GARDMSB)
+ if (!ROUND_TOWARDS_ZERO)
{
- if (fraction & (1 << NGARDS))
- fraction += GARDROUND + 1;
+ /* IF the gard bits are the all zero, but the first, then we're
+ half way between two numbers, choose the one which makes the
+ lsb of the answer 0. */
+ if ((fraction & GARDMASK) == GARDMSB)
+ {
+ if (fraction & (1 << NGARDS))
+ fraction += GARDROUND + 1;
+ }
+ else
+ {
+ /* Add a one to the guards to round up */
+ fraction += GARDROUND;
+ }
+ if (fraction >= IMPLICIT_2)
+ {
+ fraction >>= 1;
+ exp += 1;
+ }
}
- else
- {
- /* Add a one to the guards to round up */
- fraction += GARDROUND;
- }
- if (fraction >= IMPLICIT_2)
+ fraction >>= NGARDS;
+
+ if (LARGEST_EXPONENT_IS_NORMAL (FRAC_NBITS) && exp > EXPMAX)
{
- fraction >>= 1;
- exp += 1;
+ /* Saturate on overflow. */
+ exp = EXPMAX;
+ fraction = ((fractype) 1 << FRACBITS) - 1;
}
- fraction >>= NGARDS;
}
}
dst.bits.exp = exp;
dst.bits.sign = sign;
#else
+# if defined TFLOAT && defined HALFFRACBITS
+ {
+ halffractype high, low, unity;
+ int lowsign, lowexp;
+
+ unity = (halffractype) 1 << HALFFRACBITS;
+
+ /* Set HIGH to the high double's significand, masking out the implicit 1.
+ Set LOW to the low double's full significand. */
+ high = (fraction >> (FRACBITS - HALFFRACBITS)) & (unity - 1);
+ low = fraction & (unity * 2 - 1);
+
+ /* Get the initial sign and exponent of the low double. */
+ lowexp = exp - HALFFRACBITS - 1;
+ lowsign = sign;
+
+ /* HIGH should be rounded like a normal double, making |LOW| <=
+ 0.5 ULP of HIGH. Assume round-to-nearest. */
+ if (exp < EXPMAX)
+ if (low > unity || (low == unity && (high & 1) == 1))
+ {
+ /* Round HIGH up and adjust LOW to match. */
+ high++;
+ if (high == unity)
+ {
+ /* May make it infinite, but that's OK. */
+ high = 0;
+ exp++;
+ }
+ low = unity * 2 - low;
+ lowsign ^= 1;
+ }
+
+ high |= (halffractype) exp << HALFFRACBITS;
+ high |= (halffractype) sign << (HALFFRACBITS + EXPBITS);
+
+ if (exp == EXPMAX || exp == 0 || low == 0)
+ low = 0;
+ else
+ {
+ while (lowexp > 0 && low < unity)
+ {
+ low <<= 1;
+ lowexp--;
+ }
+
+ if (lowexp <= 0)
+ {
+ halffractype roundmsb, round;
+ int shift;
+
+ shift = 1 - lowexp;
+ roundmsb = (1 << (shift - 1));
+ round = low & ((roundmsb << 1) - 1);
+
+ low >>= shift;
+ lowexp = 0;
+
+ if (round > roundmsb || (round == roundmsb && (low & 1) == 1))
+ {
+ low++;
+ if (low == unity)
+ /* LOW rounds up to the smallest normal number. */
+ lowexp++;
+ }
+ }
+
+ low &= unity - 1;
+ low |= (halffractype) lowexp << HALFFRACBITS;
+ low |= (halffractype) lowsign << (HALFFRACBITS + EXPBITS);
+ }
+ dst.value_raw = ((fractype) high << HALFSHIFT) | low;
+ }
+# else
dst.value_raw = fraction & ((((fractype)1) << FRACBITS) - (fractype)1);
dst.value_raw |= ((fractype) (exp & ((1 << EXPBITS) - 1))) << FRACBITS;
dst.value_raw |= ((fractype) (sign & 1)) << (FRACBITS | EXPBITS);
+# endif
#endif
#if defined(FLOAT_WORD_ORDER_MISMATCH) && !defined(FLOAT)
+#ifdef TFLOAT
+ {
+ qrtrfractype tmp1 = dst.words[0];
+ qrtrfractype tmp2 = dst.words[1];
+ dst.words[0] = dst.words[3];
+ dst.words[1] = dst.words[2];
+ dst.words[2] = tmp2;
+ dst.words[3] = tmp1;
+ }
+#else
{
halffractype tmp = dst.words[0];
dst.words[0] = dst.words[1];
dst.words[1] = tmp;
}
#endif
+#endif
return dst.value;
}
#endif
-#if defined(L_unpack_df) || defined(L_unpack_sf)
+#if defined(L_unpack_df) || defined(L_unpack_sf) || defined(L_unpack_tf)
void
unpack_d (FLO_union_type * src, fp_number_type * dst)
{
#if defined(FLOAT_WORD_ORDER_MISMATCH) && !defined(FLOAT)
FLO_union_type swapped;
+#ifdef TFLOAT
+ swapped.words[0] = src->words[3];
+ swapped.words[1] = src->words[2];
+ swapped.words[2] = src->words[1];
+ swapped.words[3] = src->words[0];
+#else
swapped.words[0] = src->words[1];
swapped.words[1] = src->words[0];
+#endif
src = &swapped;
#endif
exp = src->bits.exp;
sign = src->bits.sign;
#else
- fraction = src->value_raw & ((((fractype)1) << FRACBITS) - (fractype)1);
+# if defined TFLOAT && defined HALFFRACBITS
+ {
+ halffractype high, low;
+
+ high = src->value_raw >> HALFSHIFT;
+ low = src->value_raw & (((fractype)1 << HALFSHIFT) - 1);
+
+ fraction = high & ((((fractype)1) << HALFFRACBITS) - 1);
+ fraction <<= FRACBITS - HALFFRACBITS;
+ exp = ((int)(high >> HALFFRACBITS)) & ((1 << EXPBITS) - 1);
+ sign = ((int)(high >> (((HALFFRACBITS + EXPBITS))))) & 1;
+
+ if (exp != EXPMAX && exp != 0 && low != 0)
+ {
+ int lowexp = ((int)(low >> HALFFRACBITS)) & ((1 << EXPBITS) - 1);
+ int lowsign = ((int)(low >> (((HALFFRACBITS + EXPBITS))))) & 1;
+ int shift;
+ fractype xlow;
+
+ xlow = low & ((((fractype)1) << HALFFRACBITS) - 1);
+ if (lowexp)
+ xlow |= (((halffractype)1) << HALFFRACBITS);
+ else
+ lowexp = 1;
+ shift = (FRACBITS - HALFFRACBITS) - (exp - lowexp);
+ if (shift > 0)
+ xlow <<= shift;
+ else if (shift < 0)
+ xlow >>= -shift;
+ if (sign == lowsign)
+ fraction += xlow;
+ else if (fraction >= xlow)
+ fraction -= xlow;
+ else
+ {
+ /* The high part is a power of two but the full number is lower.
+ This code will leave the implicit 1 in FRACTION, but we'd
+ have added that below anyway. */
+ fraction = (((fractype) 1 << FRACBITS) - xlow) << 1;
+ exp--;
+ }
+ }
+ }
+# else
+ fraction = src->value_raw & ((((fractype)1) << FRACBITS) - 1);
exp = ((int)(src->value_raw >> FRACBITS)) & ((1 << EXPBITS) - 1);
sign = ((int)(src->value_raw >> (FRACBITS + EXPBITS))) & 1;
+# endif
#endif
dst->sign = sign;
}
else
{
- /* Zero exponent with non zero fraction - it's denormalized,
+ /* Zero exponent with nonzero fraction - it's denormalized,
so there isn't a leading implicit one - we'll shift it so
it gets one. */
dst->normal_exp = exp - EXPBIAS + 1;
dst->fraction.ll = fraction;
}
}
- else if (exp == EXPMAX)
+ else if (!LARGEST_EXPONENT_IS_NORMAL (FRAC_NBITS)
+ && __builtin_expect (exp == EXPMAX, 0))
{
/* Huge exponent*/
if (fraction == 0)
}
else
{
- /* Non zero fraction, means nan */
+ /* Nonzero fraction, means nan */
+#ifdef QUIET_NAN_NEGATED
+ if ((fraction & QUIET_NAN) == 0)
+#else
if (fraction & QUIET_NAN)
+#endif
{
dst->class = CLASS_QNAN;
}
}
#endif /* L_unpack_df || L_unpack_sf */
-#if defined(L_addsub_sf) || defined(L_addsub_df)
+#if defined(L_addsub_sf) || defined(L_addsub_df) || defined(L_addsub_tf)
static fp_number_type *
_fpadd_parts (fp_number_type * a,
fp_number_type * b,
they're the same */
{
int diff;
+ int sdiff;
a_normal_exp = a->normal_exp;
b_normal_exp = b->normal_exp;
b_fraction = b->fraction.ll;
diff = a_normal_exp - b_normal_exp;
+ sdiff = diff;
if (diff < 0)
diff = -diff;
if (diff < FRAC_NBITS)
{
- /* ??? This does shifts one bit at a time. Optimize. */
- while (a_normal_exp > b_normal_exp)
+ if (sdiff > 0)
{
- b_normal_exp++;
- LSHIFT (b_fraction);
+ b_normal_exp += diff;
+ LSHIFT (b_fraction, diff);
}
- while (b_normal_exp > a_normal_exp)
+ else if (sdiff < 0)
{
- a_normal_exp++;
- LSHIFT (a_fraction);
+ a_normal_exp += diff;
+ LSHIFT (a_fraction, diff);
}
}
else
if (tmp->fraction.ll >= IMPLICIT_2)
{
- LSHIFT (tmp->fraction.ll);
+ LSHIFT (tmp->fraction.ll, 1);
tmp->normal_exp++;
}
return tmp;
}
#endif /* L_addsub_sf || L_addsub_df */
-#if defined(L_mul_sf) || defined(L_mul_df)
-static INLINE fp_number_type *
+#if defined(L_mul_sf) || defined(L_mul_df) || defined(L_mul_tf)
+static inline __attribute__ ((__always_inline__)) fp_number_type *
_fpmul_parts ( fp_number_type * a,
fp_number_type * b,
fp_number_type * tmp)
/* Calculate the mantissa by multiplying both numbers to get a
twice-as-wide number. */
{
-#if defined(NO_DI_MODE)
+#if defined(NO_DI_MODE) || defined(TFLOAT)
{
fractype x = a->fraction.ll;
fractype ylow = b->fraction.ll;
#endif
}
- tmp->normal_exp = a->normal_exp + b->normal_exp;
+ tmp->normal_exp = a->normal_exp + b->normal_exp
+ + FRAC_NBITS - (FRACBITS + NGARDS);
tmp->sign = a->sign != b->sign;
-#ifdef FLOAT
- tmp->normal_exp += 2; /* ??????????????? */
-#else
- tmp->normal_exp += 4; /* ??????????????? */
-#endif
while (high >= IMPLICIT_2)
{
tmp->normal_exp++;
high |= 1;
low <<= 1;
}
- /* rounding is tricky. if we only round if it won't make us round later. */
-#if 0
- if (low & FRACHIGH2)
- {
- if (((high & GARDMASK) != GARDMSB)
- && (((high + 1) & GARDMASK) == GARDMSB))
- {
- /* don't round, it gets done again later. */
- }
- else
- {
- high++;
- }
- }
-#endif
- if ((high & GARDMASK) == GARDMSB)
+
+ if (!ROUND_TOWARDS_ZERO && (high & GARDMASK) == GARDMSB)
{
if (high & (1 << NGARDS))
{
- /* half way, so round to even */
- high += GARDROUND + 1;
+ /* Because we're half way, we would round to even by adding
+ GARDROUND + 1, except that's also done in the packing
+ function, and rounding twice will lose precision and cause
+ the result to be too far off. Example: 32-bit floats with
+ bit patterns 0xfff * 0x3f800400 ~= 0xfff (less than 0.5ulp
+ off), not 0x1000 (more than 0.5ulp off). */
}
else if (low)
{
- /* but we really weren't half way */
+ /* We're a further than half way by a small amount corresponding
+ to the bits set in "low". Knowing that, we round here and
+ not in pack_d, because there we don't have "low" available
+ anymore. */
high += GARDROUND + 1;
+
+ /* Avoid further rounding in pack_d. */
+ high &= ~(fractype) GARDMASK;
}
}
tmp->fraction.ll = high;
return pack_d (res);
}
-#endif /* L_mul_sf || L_mul_df */
+#endif /* L_mul_sf || L_mul_df || L_mul_tf */
-#if defined(L_div_sf) || defined(L_div_df)
-static INLINE fp_number_type *
+#if defined(L_div_sf) || defined(L_div_df) || defined(L_div_tf)
+static inline __attribute__ ((__always_inline__)) fp_number_type *
_fpdiv_parts (fp_number_type * a,
fp_number_type * b)
{
numerator *= 2;
}
- if ((quotient & GARDMASK) == GARDMSB)
+ if (!ROUND_TOWARDS_ZERO && (quotient & GARDMASK) == GARDMSB)
{
if (quotient & (1 << NGARDS))
{
- /* half way, so round to even */
- quotient += GARDROUND + 1;
+ /* Because we're half way, we would round to even by adding
+ GARDROUND + 1, except that's also done in the packing
+ function, and rounding twice will lose precision and cause
+ the result to be too far off. */
}
else if (numerator)
{
- /* but we really weren't half way, more bits exist */
+ /* We're a further than half way by the small amount
+ corresponding to the bits set in "numerator". Knowing
+ that, we round here and not in pack_d, because there we
+ don't have "numerator" available anymore. */
quotient += GARDROUND + 1;
+
+ /* Avoid further rounding in pack_d. */
+ quotient &= ~(fractype) GARDMASK;
}
}
}
#endif /* L_div_sf || L_div_df */
-#if defined(L_fpcmp_parts_sf) || defined(L_fpcmp_parts_df)
+#if defined(L_fpcmp_parts_sf) || defined(L_fpcmp_parts_df) \
+ || defined(L_fpcmp_parts_tf)
/* according to the demo, fpcmp returns a comparison with 0... thus
a<b -> -1
a==b -> 0
__fpcmp_parts (fp_number_type * a, fp_number_type * b)
{
#if 0
- /* either nan -> unordered. Must be checked outside of this routine. */
+ /* either nan -> unordered. Must be checked outside of this routine. */
if (isnan (a) && isnan (b))
{
return 1; /* still unordered! */
-------+--------+--------
-inf(1)| a>b(1) | a==b(0)
-------+--------+--------
- So since unordered must be non zero, just line up the columns...
+ So since unordered must be nonzero, just line up the columns...
*/
return b->sign - a->sign;
}
- /* but not both... */
+ /* but not both... */
if (isinf (a))
{
return a->sign ? -1 : 1;
{
return a->sign ? -1 : 1;
}
- /* now both are "normal". */
+ /* now both are "normal". */
if (a->sign != b->sign)
{
/* opposite signs */
{
return a->sign ? 1 : -1;
}
- /* same exponents; check size. */
+ /* same exponents; check size. */
if (a->fraction.ll > b->fraction.ll)
{
return a->sign ? -1 : 1;
{
return a->sign ? 1 : -1;
}
- /* after all that, they're equal. */
+ /* after all that, they're equal. */
return 0;
}
#endif
-#if defined(L_compare_sf) || defined(L_compare_df)
+#if defined(L_compare_sf) || defined(L_compare_df) || defined(L_compoare_tf)
CMPtype
compare (FLO_type arg_a, FLO_type arg_b)
{
/* These should be optimized for their specific tasks someday. */
-#if defined(L_eq_sf) || defined(L_eq_df)
+#if defined(L_eq_sf) || defined(L_eq_df) || defined(L_eq_tf)
CMPtype
_eq_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_eq_sf || L_eq_df */
-#if defined(L_ne_sf) || defined(L_ne_df)
+#if defined(L_ne_sf) || defined(L_ne_df) || defined(L_ne_tf)
CMPtype
_ne_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_ne_sf || L_ne_df */
-#if defined(L_gt_sf) || defined(L_gt_df)
+#if defined(L_gt_sf) || defined(L_gt_df) || defined(L_gt_tf)
CMPtype
_gt_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_gt_sf || L_gt_df */
-#if defined(L_ge_sf) || defined(L_ge_df)
+#if defined(L_ge_sf) || defined(L_ge_df) || defined(L_ge_tf)
CMPtype
_ge_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_ge_sf || L_ge_df */
-#if defined(L_lt_sf) || defined(L_lt_df)
+#if defined(L_lt_sf) || defined(L_lt_df) || defined(L_lt_tf)
CMPtype
_lt_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_lt_sf || L_lt_df */
-#if defined(L_le_sf) || defined(L_le_df)
+#if defined(L_le_sf) || defined(L_le_df) || defined(L_le_tf)
CMPtype
_le_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_le_sf || L_le_df */
-#if defined(L_unord_sf) || defined(L_unord_df)
+#endif /* ! US_SOFTWARE_GOFAST */
+
+#if defined(L_unord_sf) || defined(L_unord_df) || defined(L_unord_tf)
CMPtype
_unord_f2 (FLO_type arg_a, FLO_type arg_b)
{
}
#endif /* L_unord_sf || L_unord_df */
-#endif /* ! US_SOFTWARE_GOFAST */
-
-#if defined(L_si_to_sf) || defined(L_si_to_df)
+#if defined(L_si_to_sf) || defined(L_si_to_df) || defined(L_si_to_tf)
FLO_type
si_to_float (SItype arg_a)
{
}
else
{
+ USItype uarg;
+ int shift;
in.normal_exp = FRACBITS + NGARDS;
if (in.sign)
{
{
return (FLO_type)(- MAX_SI_INT - 1);
}
- in.fraction.ll = (-arg_a);
+ uarg = (-arg_a);
}
else
- in.fraction.ll = arg_a;
+ uarg = arg_a;
- while (in.fraction.ll < (1LL << (FRACBITS + NGARDS)))
+ in.fraction.ll = uarg;
+ shift = clzusi (uarg) - (BITS_PER_SI - 1 - FRACBITS - NGARDS);
+ if (shift > 0)
{
- in.fraction.ll <<= 1;
- in.normal_exp -= 1;
+ in.fraction.ll <<= shift;
+ in.normal_exp -= shift;
}
}
return pack_d (&in);
}
#endif /* L_si_to_sf || L_si_to_df */
-#if defined(L_usi_to_sf) || defined(L_usi_to_df)
+#if defined(L_usi_to_sf) || defined(L_usi_to_df) || defined(L_usi_to_tf)
FLO_type
usi_to_float (USItype arg_a)
{
}
else
{
+ int shift;
in.class = CLASS_NUMBER;
in.normal_exp = FRACBITS + NGARDS;
in.fraction.ll = arg_a;
- while (in.fraction.ll > (1LL << (FRACBITS + NGARDS)))
- {
- in.fraction.ll >>= 1;
- in.normal_exp += 1;
- }
- while (in.fraction.ll < (1LL << (FRACBITS + NGARDS)))
+ shift = clzusi (arg_a) - (BITS_PER_SI - 1 - FRACBITS - NGARDS);
+ if (shift < 0)
{
- in.fraction.ll <<= 1;
- in.normal_exp -= 1;
+ fractype guard = in.fraction.ll & (((fractype)1 << -shift) - 1);
+ in.fraction.ll >>= -shift;
+ in.fraction.ll |= (guard != 0);
+ in.normal_exp -= shift;
+ }
+ else if (shift > 0)
+ {
+ in.fraction.ll <<= shift;
+ in.normal_exp -= shift;
}
}
return pack_d (&in);
}
#endif
-#if defined(L_sf_to_si) || defined(L_df_to_si)
+#if defined(L_sf_to_si) || defined(L_df_to_si) || defined(L_tf_to_si)
SItype
float_to_si (FLO_type arg_a)
{
return 0;
if (isnan (&a))
return 0;
- /* get reasonable MAX_SI_INT... */
+ /* get reasonable MAX_SI_INT... */
if (isinf (&a))
return a.sign ? (-MAX_SI_INT)-1 : MAX_SI_INT;
/* it is a number, but a small one */
}
#endif /* L_sf_to_si || L_df_to_si */
-#if defined(L_sf_to_usi) || defined(L_df_to_usi)
-#ifdef US_SOFTWARE_GOFAST
+#if defined(L_sf_to_usi) || defined(L_df_to_usi) || defined(L_tf_to_usi)
+#if defined US_SOFTWARE_GOFAST || defined(L_tf_to_usi)
/* While libgcc2.c defines its own __fixunssfsi and __fixunsdfsi routines,
we also define them for GOFAST because the ones in libgcc2.c have the
wrong names and I'd rather define these here and keep GOFAST CYG-LOC's
/* it is a negative number */
if (a.sign)
return 0;
- /* get reasonable MAX_USI_INT... */
+ /* get reasonable MAX_USI_INT... */
if (isinf (&a))
return MAX_USI_INT;
/* it is a number, but a small one */
#endif /* US_SOFTWARE_GOFAST */
#endif /* L_sf_to_usi || L_df_to_usi */
-#if defined(L_negate_sf) || defined(L_negate_df)
+#if defined(L_negate_sf) || defined(L_negate_df) || defined(L_negate_tf)
FLO_type
negate (FLO_type arg_a)
{
}
#endif /* L_sf_to_df */
+#if defined(L_sf_to_tf) && defined(TMODES)
+TFtype
+sf_to_tf (SFtype arg_a)
+{
+ fp_number_type in;
+ FLO_union_type au;
+
+ au.value = arg_a;
+ unpack_d (&au, &in);
+
+ return __make_tp (in.class, in.sign, in.normal_exp,
+ ((UTItype) in.fraction.ll) << F_T_BITOFF);
+}
+#endif /* L_sf_to_df */
+
#endif /* ! FLOAT_ONLY */
#endif /* FLOAT */
}
#endif /* L_df_to_sf */
+#if defined(L_df_to_tf) && defined(TMODES) \
+ && !defined(FLOAT) && !defined(TFLOAT)
+TFtype
+df_to_tf (DFtype arg_a)
+{
+ fp_number_type in;
+ FLO_union_type au;
+
+ au.value = arg_a;
+ unpack_d (&au, &in);
+
+ return __make_tp (in.class, in.sign, in.normal_exp,
+ ((UTItype) in.fraction.ll) << D_T_BITOFF);
+}
+#endif /* L_sf_to_df */
+
+#ifdef TFLOAT
+#if defined(L_make_tf)
+TFtype
+__make_tp(fp_class_type class,
+ unsigned int sign,
+ int exp,
+ UTItype frac)
+{
+ fp_number_type in;
+
+ in.class = class;
+ in.sign = sign;
+ in.normal_exp = exp;
+ in.fraction.ll = frac;
+ return pack_d (&in);
+}
+#endif /* L_make_tf */
+
+#if defined(L_tf_to_df)
+DFtype
+tf_to_df (TFtype arg_a)
+{
+ fp_number_type in;
+ UDItype sffrac;
+ FLO_union_type au;
+
+ au.value = arg_a;
+ unpack_d (&au, &in);
+
+ sffrac = in.fraction.ll >> D_T_BITOFF;
+
+ /* We set the lowest guard bit in SFFRAC if we discarded any non
+ zero bits. */
+ if ((in.fraction.ll & (((UTItype) 1 << D_T_BITOFF) - 1)) != 0)
+ sffrac |= 1;
+
+ return __make_dp (in.class, in.sign, in.normal_exp, sffrac);
+}
+#endif /* L_tf_to_df */
+
+#if defined(L_tf_to_sf)
+SFtype
+tf_to_sf (TFtype arg_a)
+{
+ fp_number_type in;
+ USItype sffrac;
+ FLO_union_type au;
+
+ au.value = arg_a;
+ unpack_d (&au, &in);
+
+ sffrac = in.fraction.ll >> F_T_BITOFF;
+
+ /* We set the lowest guard bit in SFFRAC if we discarded any non
+ zero bits. */
+ if ((in.fraction.ll & (((UTItype) 1 << F_T_BITOFF) - 1)) != 0)
+ sffrac |= 1;
+
+ return __make_fp (in.class, in.sign, in.normal_exp, sffrac);
+}
+#endif /* L_tf_to_sf */
+#endif /* TFLOAT */
+
#endif /* ! FLOAT */
#endif /* !EXTENDED_FLOAT_STUBS */
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