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