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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /sysdeps/ieee754/ldbl-128ibm/e_log2l.c | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-zack/build-layout-experiment.tar.gz glibc-zack/build-layout-experiment.tar.xz glibc-zack/build-layout-experiment.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/e_log2l.c')
-rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/e_log2l.c | 254 |
1 files changed, 0 insertions, 254 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_log2l.c b/sysdeps/ieee754/ldbl-128ibm/e_log2l.c deleted file mode 100644 index c820dacf08..0000000000 --- a/sysdeps/ieee754/ldbl-128ibm/e_log2l.c +++ /dev/null @@ -1,254 +0,0 @@ -/* log2l.c - * Base 2 logarithm, 128-bit long double precision - * - * - * - * SYNOPSIS: - * - * long double x, y, log2l(); - * - * y = log2l( x ); - * - * - * - * DESCRIPTION: - * - * Returns the base 2 logarithm of x. - * - * The argument is separated into its exponent and fractional - * parts. If the exponent is between -1 and +1, the (natural) - * logarithm of the fraction is approximated by - * - * log(1+x) = x - 0.5 x^2 + x^3 P(x)/Q(x). - * - * Otherwise, setting z = 2(x-1)/x+1), - * - * log(x) = z + z^3 P(z)/Q(z). - * - * - * - * ACCURACY: - * - * Relative error: - * arithmetic domain # trials peak rms - * IEEE 0.5, 2.0 100,000 2.6e-34 4.9e-35 - * IEEE exp(+-10000) 100,000 9.6e-35 4.0e-35 - * - * In the tests over the interval exp(+-10000), the logarithms - * of the random arguments were uniformly distributed over - * [-10000, +10000]. - * - */ - -/* - Cephes Math Library Release 2.2: January, 1991 - Copyright 1984, 1991 by Stephen L. Moshier - Adapted for glibc November, 2001 - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - This library 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with this library; if not, see <http://www.gnu.org/licenses/>. - */ - -#include <math.h> -#include <math_private.h> - -/* Coefficients for ln(1+x) = x - x**2/2 + x**3 P(x)/Q(x) - * 1/sqrt(2) <= x < sqrt(2) - * Theoretical peak relative error = 5.3e-37, - * relative peak error spread = 2.3e-14 - */ -static const long double P[13] = -{ - 1.313572404063446165910279910527789794488E4L, - 7.771154681358524243729929227226708890930E4L, - 2.014652742082537582487669938141683759923E5L, - 3.007007295140399532324943111654767187848E5L, - 2.854829159639697837788887080758954924001E5L, - 1.797628303815655343403735250238293741397E5L, - 7.594356839258970405033155585486712125861E4L, - 2.128857716871515081352991964243375186031E4L, - 3.824952356185897735160588078446136783779E3L, - 4.114517881637811823002128927449878962058E2L, - 2.321125933898420063925789532045674660756E1L, - 4.998469661968096229986658302195402690910E-1L, - 1.538612243596254322971797716843006400388E-6L -}; -static const long double Q[12] = -{ - 3.940717212190338497730839731583397586124E4L, - 2.626900195321832660448791748036714883242E5L, - 7.777690340007566932935753241556479363645E5L, - 1.347518538384329112529391120390701166528E6L, - 1.514882452993549494932585972882995548426E6L, - 1.158019977462989115839826904108208787040E6L, - 6.132189329546557743179177159925690841200E5L, - 2.248234257620569139969141618556349415120E5L, - 5.605842085972455027590989944010492125825E4L, - 9.147150349299596453976674231612674085381E3L, - 9.104928120962988414618126155557301584078E2L, - 4.839208193348159620282142911143429644326E1L -/* 1.000000000000000000000000000000000000000E0L, */ -}; - -/* Coefficients for log(x) = z + z^3 P(z^2)/Q(z^2), - * where z = 2(x-1)/(x+1) - * 1/sqrt(2) <= x < sqrt(2) - * Theoretical peak relative error = 1.1e-35, - * relative peak error spread 1.1e-9 - */ -static const long double R[6] = -{ - 1.418134209872192732479751274970992665513E5L, - -8.977257995689735303686582344659576526998E4L, - 2.048819892795278657810231591630928516206E4L, - -2.024301798136027039250415126250455056397E3L, - 8.057002716646055371965756206836056074715E1L, - -8.828896441624934385266096344596648080902E-1L -}; -static const long double S[6] = -{ - 1.701761051846631278975701529965589676574E6L, - -1.332535117259762928288745111081235577029E6L, - 4.001557694070773974936904547424676279307E5L, - -5.748542087379434595104154610899551484314E4L, - 3.998526750980007367835804959888064681098E3L, - -1.186359407982897997337150403816839480438E2L -/* 1.000000000000000000000000000000000000000E0L, */ -}; - -static const long double -/* log2(e) - 1 */ -LOG2EA = 4.4269504088896340735992468100189213742664595E-1L, -/* sqrt(2)/2 */ -SQRTH = 7.071067811865475244008443621048490392848359E-1L; - - -/* Evaluate P[n] x^n + P[n-1] x^(n-1) + ... + P[0] */ - -static long double -neval (long double x, const long double *p, int n) -{ - long double y; - - p += n; - y = *p--; - do - { - y = y * x + *p--; - } - while (--n > 0); - return y; -} - - -/* Evaluate x^n+1 + P[n] x^(n) + P[n-1] x^(n-1) + ... + P[0] */ - -static long double -deval (long double x, const long double *p, int n) -{ - long double y; - - p += n; - y = x + *p--; - do - { - y = y * x + *p--; - } - while (--n > 0); - return y; -} - - - -long double -__ieee754_log2l (long double x) -{ - long double z; - long double y; - int e; - int64_t hx; - double xhi; - -/* Test for domain */ - xhi = ldbl_high (x); - EXTRACT_WORDS64 (hx, xhi); - if ((hx & 0x7fffffffffffffffLL) == 0) - return (-1.0L / __fabsl (x)); /* log2l(+-0)=-inf */ - if (hx < 0) - return (x - x) / (x - x); - if (hx >= 0x7ff0000000000000LL) - return (x + x); - - if (x == 1.0L) - return 0.0L; - -/* separate mantissa from exponent */ - -/* Note, frexp is used so that denormal numbers - * will be handled properly. - */ - x = __frexpl (x, &e); - - -/* logarithm using log(x) = z + z**3 P(z)/Q(z), - * where z = 2(x-1)/x+1) - */ - if ((e > 2) || (e < -2)) - { - if (x < SQRTH) - { /* 2( 2x-1 )/( 2x+1 ) */ - e -= 1; - z = x - 0.5L; - y = 0.5L * z + 0.5L; - } - else - { /* 2 (x-1)/(x+1) */ - z = x - 0.5L; - z -= 0.5L; - y = 0.5L * x + 0.5L; - } - x = z / y; - z = x * x; - y = x * (z * neval (z, R, 5) / deval (z, S, 5)); - goto done; - } - - -/* logarithm using log(1+x) = x - .5x**2 + x**3 P(x)/Q(x) */ - - if (x < SQRTH) - { - e -= 1; - x = 2.0 * x - 1.0L; /* 2x - 1 */ - } - else - { - x = x - 1.0L; - } - z = x * x; - y = x * (z * neval (x, P, 12) / deval (x, Q, 11)); - y = y - 0.5 * z; - -done: - -/* Multiply log of fraction by log2(e) - * and base 2 exponent by 1 - */ - z = y * LOG2EA; - z += x * LOG2EA; - z += y; - z += x; - z += e; - return (z); -} -strong_alias (__ieee754_log2l, __log2l_finite) |