mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 19:53:32 +08:00
* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Remove
unused ily variable. Fix nextafterl on +-__LDBL_MAX__ and +-Inf. Remove unreachable code at the end. 2007-06-01 Steven Munroe <sjmunroe@us.ibm.com> * sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c: Correct description of ldbl-128ibm in comment. (fpclassifyl): Correct classification of denormals. * sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Correct return value for MIN denormal. Rewrite using long double math too correctly handle denormals and canonicalize the results. 2007-06-05 Jakub Jelinek <jakub@redhat.com> * sysdeps/ieee754/ldbl-128ibm/mpn2ldbl.c (__mpn_construct_long_double): Fix conversion where result ought to be smaller than __LDBL_MIN__, or the low double should be denormal. Fix decision where to negate low double - honor round to even rules. * stdio-common/tst-sprintf2.c: Include string.h. (COMPARE_LDBL): Define. (TEST): Also test whether a string hexadecimal float representation can be parsed back to the number. (main): Add a couple of further tests. 2007-06-04 Jakub Jelinek <jakub@redhat.com>
This commit is contained in:
Ulrich Drepper
parent
835abc5c0d
commit
7e3706ea25
28
ChangeLog
28
ChangeLog
@ -6,6 +6,34 @@
|
||||
* sysdeps/x86_64/ldbl2mpn.c: New file.
|
||||
* sysdeps/ia64/ldbl2mpn.c: New file.
|
||||
|
||||
2007-06-04 Jakub Jelinek <jakub@redhat.com>
|
||||
|
||||
* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Remove
|
||||
unused ily variable. Fix nextafterl on +-__LDBL_MAX__ and +-Inf.
|
||||
Remove unreachable code at the end.
|
||||
|
||||
2007-06-01 Steven Munroe <sjmunroe@us.ibm.com>
|
||||
|
||||
* sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c: Correct description of
|
||||
ldbl-128ibm in comment.
|
||||
(fpclassifyl): Correct classification of denormals.
|
||||
* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Correct
|
||||
return value for MIN denormal. Rewrite using long double math too
|
||||
correctly handle denormals and canonicalize the results.
|
||||
|
||||
2007-06-05 Jakub Jelinek <jakub@redhat.com>
|
||||
|
||||
* sysdeps/ieee754/ldbl-128ibm/mpn2ldbl.c
|
||||
(__mpn_construct_long_double): Fix conversion where result ought
|
||||
to be smaller than __LDBL_MIN__, or the low double should be
|
||||
denormal. Fix decision where to negate low double - honor round
|
||||
to even rules.
|
||||
* stdio-common/tst-sprintf2.c: Include string.h.
|
||||
(COMPARE_LDBL): Define.
|
||||
(TEST): Also test whether a string hexadecimal float representation
|
||||
can be parsed back to the number.
|
||||
(main): Add a couple of further tests.
|
||||
|
||||
2007-06-04 Jakub Jelinek <jakub@redhat.com>
|
||||
|
||||
* sysdeps/ieee754/ldbl-128ibm/printf_fphex.c
|
||||
|
||||
@ -1,14 +1,22 @@
|
||||
#include <float.h>
|
||||
#include <math.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
int
|
||||
main (void)
|
||||
{
|
||||
volatile union { long double l; long long x[2]; } u;
|
||||
volatile union { long double l; long long x[2]; } u, v;
|
||||
char buf[64];
|
||||
int result = 0;
|
||||
|
||||
#if LDBL_MANT_DIG == 106 || LDBL_MANT_DIG == 113
|
||||
# define COMPARE_LDBL(u, v) \
|
||||
((u).l == (v).l && (u).x[0] == (v).x[0] && (u).x[1] == (v).x[1])
|
||||
#else
|
||||
# define COMPARE_LDBL(u, v) ((u).l == (v).l)
|
||||
#endif
|
||||
|
||||
#define TEST(val) \
|
||||
do \
|
||||
{ \
|
||||
@ -19,6 +27,12 @@ main (void)
|
||||
printf ("Error on line %d: %s != %s\n", __LINE__, buf, #val); \
|
||||
result = 1; \
|
||||
} \
|
||||
if (sscanf (#val, "%La", &v.l) != 1 || !COMPARE_LDBL (u, v)) \
|
||||
{ \
|
||||
printf ("Error sscanf on line %d: %La != %La\n", __LINE__, \
|
||||
u.l, v.l); \
|
||||
result = 1; \
|
||||
} \
|
||||
/* printf ("%s %La %016Lx %016Lx\n", #val, u.l, u.x[0], u.x[1]); */ \
|
||||
} \
|
||||
while (0)
|
||||
@ -54,6 +68,15 @@ main (void)
|
||||
TEST (0x1.23456789abcdef123456789abc8p+64L);
|
||||
TEST (0x1.23456789abcde7123456789abc8p+64L);
|
||||
TEST (0x1.123456789abcdef123456789p-969L);
|
||||
# if LDBL_MANT_DIG == 106
|
||||
TEST (-0x1.2d71957cc1263bbbeb1d365f1e8p-969L);
|
||||
TEST (0x1.23456789abcdef0123456789abp-970L);
|
||||
TEST (0x1.579bde02468acp-1001L);
|
||||
TEST (0x0.abcdef0123456p-1022L);
|
||||
TEST (0x1.abcdef0123456p-1022L);
|
||||
TEST (0x1.abcdef012345678p-1014L);
|
||||
TEST (0x1.abcdef0123456f8p-1014L);
|
||||
# endif
|
||||
#endif
|
||||
return result;
|
||||
}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2004, 2006
|
||||
/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2004, 2006, 2007
|
||||
Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
@ -31,19 +31,20 @@ long double
|
||||
__mpn_construct_long_double (mp_srcptr frac_ptr, int expt, int sign)
|
||||
{
|
||||
union ibm_extended_long_double u;
|
||||
unsigned long hidden2, lzcount;
|
||||
unsigned long lzcount;
|
||||
unsigned long long hi, lo;
|
||||
int exponent2;
|
||||
|
||||
u.ieee.negative = sign;
|
||||
u.ieee.negative2 = sign;
|
||||
u.ieee.exponent = expt + IBM_EXTENDED_LONG_DOUBLE_BIAS;
|
||||
u.ieee.exponent2 = expt - 53 + IBM_EXTENDED_LONG_DOUBLE_BIAS;
|
||||
u.ieee.exponent2 = 0;
|
||||
exponent2 = expt - 53 + IBM_EXTENDED_LONG_DOUBLE_BIAS;
|
||||
|
||||
#if BITS_PER_MP_LIMB == 32
|
||||
/* The low order 53 bits (52 + hidden) go into the lower double */
|
||||
lo = frac_ptr[0];
|
||||
lo |= (frac_ptr[1] & ((1LL << (53 - 32)) - 1)) << 32;
|
||||
hidden2 = (frac_ptr[1] >> (52 - 32)) & ((mp_limb_t) 1);
|
||||
/* The high order 53 bits (52 + hidden) go into the upper double */
|
||||
hi = (frac_ptr[1] >> (53 - 32)) & ((1 << 11) - 1);
|
||||
hi |= ((unsigned long long) frac_ptr[2]) << 11;
|
||||
@ -51,7 +52,6 @@ __mpn_construct_long_double (mp_srcptr frac_ptr, int expt, int sign)
|
||||
#elif BITS_PER_MP_LIMB == 64
|
||||
/* The low order 53 bits (52 + hidden) go into the lower double */
|
||||
lo = frac_ptr[0] & (((mp_limb_t) 1 << 53) - 1);
|
||||
hidden2 = (frac_ptr[0] >> 52) & ((mp_limb_t) 1);
|
||||
/* The high order 53 bits (52 + hidden) go into the upper double */
|
||||
hi = (frac_ptr[0] >> 53) & (((mp_limb_t) 1 << 11) - 1);
|
||||
hi |= (frac_ptr[1] << 11);
|
||||
@ -59,14 +59,62 @@ __mpn_construct_long_double (mp_srcptr frac_ptr, int expt, int sign)
|
||||
#error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
|
||||
#endif
|
||||
|
||||
if ((hi & (1LL << 52)) == 0 && (hi | lo) != 0)
|
||||
{
|
||||
/* denormal number */
|
||||
unsigned long long val = hi ? hi : lo;
|
||||
|
||||
if (sizeof (val) == sizeof (long))
|
||||
lzcount = __builtin_clzl (val);
|
||||
else if ((val >> 32) != 0)
|
||||
lzcount = __builtin_clzl ((long) (val >> 32));
|
||||
else
|
||||
lzcount = __builtin_clzl ((long) val) + 32;
|
||||
if (hi)
|
||||
lzcount = lzcount - 11;
|
||||
else
|
||||
lzcount = lzcount + 42;
|
||||
|
||||
if (lzcount > u.ieee.exponent)
|
||||
{
|
||||
lzcount = u.ieee.exponent;
|
||||
u.ieee.exponent = 0;
|
||||
exponent2 -= lzcount;
|
||||
}
|
||||
else
|
||||
{
|
||||
u.ieee.exponent -= (lzcount - 1);
|
||||
exponent2 -= (lzcount - 1);
|
||||
}
|
||||
|
||||
if (lzcount <= 53)
|
||||
{
|
||||
hi = (hi << lzcount) | (lo >> (53 - lzcount));
|
||||
lo = (lo << lzcount) & ((1LL << 53) - 1);
|
||||
}
|
||||
else
|
||||
{
|
||||
hi = lo << (lzcount - 53);
|
||||
lo = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (lo != 0L)
|
||||
{
|
||||
/* hidden2 bit of low double controls rounding of the high double.
|
||||
If hidden2 is '1' then round up hi and adjust lo (2nd mantissa)
|
||||
If hidden2 is '1' and either the explicit mantissa is non-zero
|
||||
or hi is odd, then round up hi and adjust lo (2nd mantissa)
|
||||
plus change the sign of the low double to compensate. */
|
||||
if (hidden2)
|
||||
if ((lo & (1LL << 52)) != 0
|
||||
&& ((hi & 1) != 0 || (lo & ((1LL << 52) - 1))))
|
||||
{
|
||||
hi++;
|
||||
if ((hi & ((1LL << 52) - 1)) == 0)
|
||||
{
|
||||
if ((hi & (1LL << 53)) != 0)
|
||||
hi -= 1LL << 52;
|
||||
u.ieee.exponent++;
|
||||
}
|
||||
u.ieee.negative2 = !sign;
|
||||
lo = (1LL << 53) - lo;
|
||||
}
|
||||
@ -85,17 +133,18 @@ __mpn_construct_long_double (mp_srcptr frac_ptr, int expt, int sign)
|
||||
if (lzcount > 0)
|
||||
{
|
||||
lo = lo << lzcount;
|
||||
u.ieee.exponent2 = u.ieee.exponent2 - lzcount;
|
||||
exponent2 = exponent2 - lzcount;
|
||||
}
|
||||
if (exponent2 > 0)
|
||||
u.ieee.exponent2 = exponent2;
|
||||
else
|
||||
lo >>= 1 - exponent2;
|
||||
}
|
||||
else
|
||||
{
|
||||
u.ieee.negative2 = 0;
|
||||
u.ieee.exponent2 = 0;
|
||||
}
|
||||
u.ieee.negative2 = 0;
|
||||
|
||||
u.ieee.mantissa3 = lo & 0xffffffffLL;
|
||||
u.ieee.mantissa2 = (lo >> 32) & 0xffffff;
|
||||
u.ieee.mantissa2 = (lo >> 32) & 0xfffff;
|
||||
u.ieee.mantissa1 = hi & 0xffffffffLL;
|
||||
u.ieee.mantissa0 = (hi >> 32) & ((1LL << (LDBL_MANT_DIG - 86)) - 1);
|
||||
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
/* Return classification value corresponding to argument.
|
||||
Copyright (C) 1997,1999,2002,2004,2006 Free Software Foundation, Inc.
|
||||
Copyright (C) 1997,1999,2002,2004,2006,2007 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
|
||||
Jakub Jelinek <jj@ultra.linux.cz>, 1999.
|
||||
@ -30,14 +30,16 @@
|
||||
* -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
||||
* +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
|
||||
* -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
|
||||
* +0 0000 0000 0000 0000
|
||||
* -0 8000 0000 0000 0000
|
||||
* +normal 001n nnnn nnnn nnnn (smallest)
|
||||
* -normal 801n nnnn nnnn nnnn (smallest)
|
||||
* +normal 7fen nnnn nnnn nnnn (largest)
|
||||
* -normal ffen nnnn nnnn nnnn (largest)
|
||||
* +denorm 000n nnnn nnnn nnnn
|
||||
* -denorm 800n nnnn nnnn nnnn
|
||||
* +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
|
||||
* -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
|
||||
* +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
|
||||
* -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
|
||||
* +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
|
||||
* +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
|
||||
* +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
|
||||
* -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
|
||||
* +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
||||
* -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
||||
*/
|
||||
|
||||
int
|
||||
@ -59,12 +61,23 @@ ___fpclassifyl (long double x)
|
||||
/* +/-zero or +/- normal or +/- denormal */
|
||||
if (hx & 0x7fffffffffffffffULL) {
|
||||
/* +/- normal or +/- denormal */
|
||||
if ((hx & 0x7ff0000000000000ULL) >= 0x0360000000000000ULL) {
|
||||
if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) {
|
||||
/* +/- normal */
|
||||
retval = FP_NORMAL;
|
||||
} else {
|
||||
/* +/- denormal */
|
||||
retval = FP_SUBNORMAL;
|
||||
if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) {
|
||||
if ((lx & 0x7fffffffffffffff) /* lower is non-zero */
|
||||
&& ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */
|
||||
/* +/- denormal */
|
||||
retval = FP_SUBNORMAL;
|
||||
} else {
|
||||
/* +/- normal */
|
||||
retval = FP_NORMAL;
|
||||
}
|
||||
} else {
|
||||
/* +/- denormal */
|
||||
retval = FP_SUBNORMAL;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
/* +/- zero */
|
||||
|
||||
@ -35,7 +35,7 @@ static char rcsid[] = "$NetBSD: $";
|
||||
long double x,y;
|
||||
#endif
|
||||
{
|
||||
int64_t hx,hy,ihx,ihy,ilx,ily;
|
||||
int64_t hx,hy,ihx,ihy,ilx;
|
||||
u_int64_t lx,ly;
|
||||
|
||||
GET_LDOUBLE_WORDS64(hx,lx,x);
|
||||
@ -43,7 +43,6 @@ static char rcsid[] = "$NetBSD: $";
|
||||
ihx = hx&0x7fffffffffffffffLL; /* |hx| */
|
||||
ilx = lx&0x7fffffffffffffffLL; /* |lx| */
|
||||
ihy = hy&0x7fffffffffffffffLL; /* |hy| */
|
||||
ily = ly&0x7fffffffffffffffLL; /* |ly| */
|
||||
|
||||
if((((ihx&0x7ff0000000000000LL)==0x7ff0000000000000LL)&&
|
||||
((ihx&0x000fffffffffffffLL)!=0)) || /* x is nan */
|
||||
@ -54,54 +53,66 @@ static char rcsid[] = "$NetBSD: $";
|
||||
return y; /* x=y, return y */
|
||||
if(ihx == 0 && ilx == 0) { /* x == 0 */
|
||||
long double u;
|
||||
SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
|
||||
u = math_opt_barrier (u);
|
||||
hy = (hy & 0x8000000000000000ULL) | 1;
|
||||
SET_LDOUBLE_WORDS64(x,hy,0ULL);/* return +-minsubnormal */
|
||||
u = math_opt_barrier (x);
|
||||
u = u * u;
|
||||
math_force_eval (u); /* raise underflow flag */
|
||||
return x;
|
||||
}
|
||||
if(ihx>=0) { /* x > 0 */
|
||||
if(ihx>ihy||((ihx==ihy)&&(ilx>ily))) { /* x > y, x -= ulp */
|
||||
|
||||
if(ilx==0)
|
||||
hx--;
|
||||
else
|
||||
lx--;
|
||||
} else { /* x < y, x += ulp */
|
||||
if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL))
|
||||
{
|
||||
SET_LDOUBLE_WORDS64(x,0x7ff0000000000000,0x8000000000000000);
|
||||
return x;
|
||||
}
|
||||
else if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL))
|
||||
{
|
||||
SET_LDOUBLE_WORDS64(x,0xfff0000000000000,0x8000000000000000);
|
||||
return x;
|
||||
}
|
||||
else if((lx&0x7fffffffffffffff)==0) hx++;
|
||||
else
|
||||
lx++;
|
||||
|
||||
long double u;
|
||||
if(x > y) { /* x > y, x -= ulp */
|
||||
if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL))
|
||||
return x+x; /* overflow, return -inf */
|
||||
if (hx >= 0x7ff0000000000000LL) {
|
||||
SET_LDOUBLE_WORDS64(u,0x7fefffffffffffffLL,0x7c8ffffffffffffeLL);
|
||||
return u;
|
||||
}
|
||||
} else { /* x < 0 */
|
||||
if(ihy>=0||ihx>ihy||((ihx==ihy)&&(ilx>ily))){/* x < y, x -= ulp */
|
||||
if((lx&0x7fffffffffffffff)==0)
|
||||
hx--;
|
||||
else
|
||||
lx--;
|
||||
} else { /* x > y, x += ulp */
|
||||
if((lx&0x7fffffffffffffff)==0) hx++;
|
||||
else
|
||||
lx++;
|
||||
if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
|
||||
u = math_opt_barrier (x);
|
||||
x -= __LDBL_DENORM_MIN__;
|
||||
if (ihx < 0x0360000000000000LL
|
||||
|| (hx > 0 && (int64_t) lx <= 0)
|
||||
|| (hx < 0 && (int64_t) lx > 1)) {
|
||||
u = u * u;
|
||||
math_force_eval (u); /* raise underflow flag */
|
||||
}
|
||||
return x;
|
||||
}
|
||||
if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
|
||||
SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL);
|
||||
u *= 0x1.0000000000000p-105L;
|
||||
} else
|
||||
SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL);
|
||||
return x - u;
|
||||
} else { /* x < y, x += ulp */
|
||||
if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL))
|
||||
return x+x; /* overflow, return +inf */
|
||||
if ((u_int64_t) hx >= 0xfff0000000000000ULL) {
|
||||
SET_LDOUBLE_WORDS64(u,0xffefffffffffffffLL,0xfc8ffffffffffffeLL);
|
||||
return u;
|
||||
}
|
||||
if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
|
||||
u = math_opt_barrier (x);
|
||||
x += __LDBL_DENORM_MIN__;
|
||||
if (ihx < 0x0360000000000000LL
|
||||
|| (hx > 0 && (int64_t) lx < 0 && lx != 0x8000000000000001LL)
|
||||
|| (hx < 0 && (int64_t) lx >= 0)) {
|
||||
u = u * u;
|
||||
math_force_eval (u); /* raise underflow flag */
|
||||
}
|
||||
if (x == 0.0L) /* handle negative __LDBL_DENORM_MIN__ case */
|
||||
x = -0.0L;
|
||||
return x;
|
||||
}
|
||||
if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
|
||||
SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL);
|
||||
u *= 0x1.0000000000000p-105L;
|
||||
} else
|
||||
SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL);
|
||||
return x + u;
|
||||
}
|
||||
hy = hx&0x7ff0000000000000LL;
|
||||
if(hy==0x7ff0000000000000LL) return x+x;/* overflow */
|
||||
if(hy==0) {
|
||||
long double u = x * x; /* underflow */
|
||||
math_force_eval (u); /* raise underflow flag */
|
||||
}
|
||||
SET_LDOUBLE_WORDS64(x,hx,lx);
|
||||
return x;
|
||||
}
|
||||
strong_alias (__nextafterl, __nexttowardl)
|
||||
long_double_symbol (libm, __nextafterl, nextafterl);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user