From a334319f6530564d22e775935d9c91663623a1b4 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 22 Dec 2004 20:10:10 +0000 Subject: (CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4. --- sysdeps/ieee754/ldbl-128ibm/e_logl.c | 281 ----------------------------------- 1 file changed, 281 deletions(-) delete mode 100644 sysdeps/ieee754/ldbl-128ibm/e_logl.c (limited to 'sysdeps/ieee754/ldbl-128ibm/e_logl.c') diff --git a/sysdeps/ieee754/ldbl-128ibm/e_logl.c b/sysdeps/ieee754/ldbl-128ibm/e_logl.c deleted file mode 100644 index aa5fc3740f..0000000000 --- a/sysdeps/ieee754/ldbl-128ibm/e_logl.c +++ /dev/null @@ -1,281 +0,0 @@ -/* logll.c - * - * Natural logarithm for 128-bit long double precision. - * - * - * - * SYNOPSIS: - * - * long double x, y, logl(); - * - * y = logl( x ); - * - * - * - * DESCRIPTION: - * - * Returns the base e (2.718...) logarithm of x. - * - * The argument is separated into its exponent and fractional - * parts. Use of a lookup table increases the speed of the routine. - * The program uses logarithms tabulated at intervals of 1/128 to - * cover the domain from approximately 0.7 to 1.4. - * - * On the interval [-1/128, +1/128] the logarithm of 1+x is approximated by - * log(1+x) = x - 0.5 x^2 + x^3 P(x) . - * - * - * - * ACCURACY: - * - * Relative error: - * arithmetic domain # trials peak rms - * IEEE 0.875, 1.125 100000 1.2e-34 4.1e-35 - * IEEE 0.125, 8 100000 1.2e-34 4.1e-35 - * - * - * WARNING: - * - * This program uses integer operations on bit fields of floating-point - * numbers. It does not work with data structures other than the - * structure assumed. - * - */ - -/* Copyright 2001 by Stephen L. Moshier - - 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, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ - -#include "math_private.h" - -/* log(1+x) = x - .5 x^2 + x^3 l(x) - -.0078125 <= x <= +.0078125 - peak relative error 1.2e-37 */ -static const long double -l3 = 3.333333333333333333333333333333336096926E-1L, -l4 = -2.499999999999999999999999999486853077002E-1L, -l5 = 1.999999999999999999999999998515277861905E-1L, -l6 = -1.666666666666666666666798448356171665678E-1L, -l7 = 1.428571428571428571428808945895490721564E-1L, -l8 = -1.249999999999999987884655626377588149000E-1L, -l9 = 1.111111111111111093947834982832456459186E-1L, -l10 = -1.000000000000532974938900317952530453248E-1L, -l11 = 9.090909090915566247008015301349979892689E-2L, -l12 = -8.333333211818065121250921925397567745734E-2L, -l13 = 7.692307559897661630807048686258659316091E-2L, -l14 = -7.144242754190814657241902218399056829264E-2L, -l15 = 6.668057591071739754844678883223432347481E-2L; - -/* Lookup table of ln(t) - (t-1) - t = 0.5 + (k+26)/128) - k = 0, ..., 91 */ -static const long double logtbl[92] = { --5.5345593589352099112142921677820359632418E-2L, --5.2108257402767124761784665198737642086148E-2L, --4.8991686870576856279407775480686721935120E-2L, --4.5993270766361228596215288742353061431071E-2L, --4.3110481649613269682442058976885699556950E-2L, --4.0340872319076331310838085093194799765520E-2L, --3.7682072451780927439219005993827431503510E-2L, --3.5131785416234343803903228503274262719586E-2L, --3.2687785249045246292687241862699949178831E-2L, --3.0347913785027239068190798397055267411813E-2L, --2.8110077931525797884641940838507561326298E-2L, --2.5972247078357715036426583294246819637618E-2L, --2.3932450635346084858612873953407168217307E-2L, --2.1988775689981395152022535153795155900240E-2L, --2.0139364778244501615441044267387667496733E-2L, --1.8382413762093794819267536615342902718324E-2L, --1.6716169807550022358923589720001638093023E-2L, --1.5138929457710992616226033183958974965355E-2L, --1.3649036795397472900424896523305726435029E-2L, --1.2244881690473465543308397998034325468152E-2L, --1.0924898127200937840689817557742469105693E-2L, --9.6875626072830301572839422532631079809328E-3L, --8.5313926245226231463436209313499745894157E-3L, --7.4549452072765973384933565912143044991706E-3L, --6.4568155251217050991200599386801665681310E-3L, --5.5356355563671005131126851708522185605193E-3L, --4.6900728132525199028885749289712348829878E-3L, --3.9188291218610470766469347968659624282519E-3L, --3.2206394539524058873423550293617843896540E-3L, --2.5942708080877805657374888909297113032132E-3L, --2.0385211375711716729239156839929281289086E-3L, --1.5522183228760777967376942769773768850872E-3L, --1.1342191863606077520036253234446621373191E-3L, --7.8340854719967065861624024730268350459991E-4L, --4.9869831458030115699628274852562992756174E-4L, --2.7902661731604211834685052867305795169688E-4L, --1.2335696813916860754951146082826952093496E-4L, --3.0677461025892873184042490943581654591817E-5L, -#define ZERO logtbl[38] - 0.0000000000000000000000000000000000000000E0L, --3.0359557945051052537099938863236321874198E-5L, --1.2081346403474584914595395755316412213151E-4L, --2.7044071846562177120083903771008342059094E-4L, --4.7834133324631162897179240322783590830326E-4L, --7.4363569786340080624467487620270965403695E-4L, --1.0654639687057968333207323853366578860679E-3L, --1.4429854811877171341298062134712230604279E-3L, --1.8753781835651574193938679595797367137975E-3L, --2.3618380914922506054347222273705859653658E-3L, --2.9015787624124743013946600163375853631299E-3L, --3.4938307889254087318399313316921940859043E-3L, --4.1378413103128673800485306215154712148146E-3L, --4.8328735414488877044289435125365629849599E-3L, --5.5782063183564351739381962360253116934243E-3L, --6.3731336597098858051938306767880719015261E-3L, --7.2169643436165454612058905294782949315193E-3L, --8.1090214990427641365934846191367315083867E-3L, --9.0486422112807274112838713105168375482480E-3L, --1.0035177140880864314674126398350812606841E-2L, --1.1067990155502102718064936259435676477423E-2L, --1.2146457974158024928196575103115488672416E-2L, --1.3269969823361415906628825374158424754308E-2L, --1.4437927104692837124388550722759686270765E-2L, --1.5649743073340777659901053944852735064621E-2L, --1.6904842527181702880599758489058031645317E-2L, --1.8202661505988007336096407340750378994209E-2L, --1.9542647000370545390701192438691126552961E-2L, --2.0924256670080119637427928803038530924742E-2L, --2.2346958571309108496179613803760727786257E-2L, --2.3810230892650362330447187267648486279460E-2L, --2.5313561699385640380910474255652501521033E-2L, --2.6856448685790244233704909690165496625399E-2L, --2.8438398935154170008519274953860128449036E-2L, --3.0058928687233090922411781058956589863039E-2L, --3.1717563112854831855692484086486099896614E-2L, --3.3413836095418743219397234253475252001090E-2L, --3.5147290019036555862676702093393332533702E-2L, --3.6917475563073933027920505457688955423688E-2L, --3.8723951502862058660874073462456610731178E-2L, --4.0566284516358241168330505467000838017425E-2L, --4.2444048996543693813649967076598766917965E-2L, --4.4356826869355401653098777649745233339196E-2L, --4.6304207416957323121106944474331029996141E-2L, --4.8285787106164123613318093945035804818364E-2L, --5.0301169421838218987124461766244507342648E-2L, --5.2349964705088137924875459464622098310997E-2L, --5.4431789996103111613753440311680967840214E-2L, --5.6546268881465384189752786409400404404794E-2L, --5.8693031345788023909329239565012647817664E-2L, --6.0871713627532018185577188079210189048340E-2L, --6.3081958078862169742820420185833800925568E-2L, --6.5323413029406789694910800219643791556918E-2L, --6.7595732653791419081537811574227049288168E-2L -}; - -/* ln(2) = ln2a + ln2b with extended precision. */ -static const long double - ln2a = 6.93145751953125e-1L, - ln2b = 1.4286068203094172321214581765680755001344E-6L; - -long double -__ieee754_logl(long double x) -{ - long double z, y, w; - ieee854_long_double_shape_type u, t; - unsigned int m; - int k, e; - - u.value = x; - m = u.parts32.w0; - - /* Check for IEEE special cases. */ - k = m & 0x7fffffff; - /* log(0) = -infinity. */ - if ((k | u.parts32.w1 | (u.parts32.w2 & 0x7fffffff) | u.parts32.w3) == 0) - { - return -0.5L / ZERO; - } - /* log ( x < 0 ) = NaN */ - if (m & 0x80000000) - { - return (x - x) / ZERO; - } - /* log (infinity or NaN) */ - if (k >= 0x7ff00000) - { - return x + x; - } - - /* On this interval the table is not used due to cancellation error. */ - if ((x <= 1.0078125L) && (x >= 0.9921875L)) - { - z = x - 1.0L; - k = 64; - t.value = 1.0L; - e = 0; - } - else - { - /* Extract exponent and reduce domain to 0.703125 <= u < 1.40625 */ - unsigned int w0; - e = (int) (m >> 20) - (int) 0x3fe; - m &= 0xfffff; - w0 = m | 0x3fe00000; - m |= 0x100000; - /* Find lookup table index k from high order bits of the significand. */ - if (m < 0x168000) - { - k = (m - 0xff000) >> 13; - /* t is the argument 0.5 + (k+26)/128 - of the nearest item to u in the lookup table. */ - t.parts32.w0 = 0x3ff00000 + (k << 13); - t.parts32.w1 = 0; - t.parts32.w2 = 0; - t.parts32.w3 = 0; - w0 += 0x100000; - e -= 1; - k += 64; - } - else - { - k = (m - 0xfe000) >> 14; - t.parts32.w0 = 0x3fe00000 + (k << 14); - t.parts32.w1 = 0; - t.parts32.w2 = 0; - t.parts32.w3 = 0; - } - u.value = __scalbnl (u.value, ((int) ((w0 - u.parts32.w0) * 2)) >> 21); - /* log(u) = log( t u/t ) = log(t) + log(u/t) - log(t) is tabulated in the lookup table. - Express log(u/t) = log(1+z), where z = u/t - 1 = (u-t)/t. - cf. Cody & Waite. */ - z = (u.value - t.value) / t.value; - } - /* Series expansion of log(1+z). */ - w = z * z; - y = ((((((((((((l15 * z - + l14) * z - + l13) * z - + l12) * z - + l11) * z - + l10) * z - + l9) * z - + l8) * z - + l7) * z - + l6) * z - + l5) * z - + l4) * z - + l3) * z * w; - y -= 0.5 * w; - y += e * ln2b; /* Base 2 exponent offset times ln(2). */ - y += z; - y += logtbl[k-26]; /* log(t) - (t-1) */ - y += (t.value - 1.0L); - y += e * ln2a; - return y; -} -- cgit 1.4.1