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NetBSD/sys/arch/m68k/fpe/fpu_log.c

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Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
/* $NetBSD: fpu_log.c,v 1.2 1995/11/05 00:35:31 briggs Exp $ */
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
/*
* Copyright (c) 1995 Ken Nakata
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)fpu_log.c 10/8/95
*/
#include <sys/types.h>
#include "fpu_emulate.h"
static u_int logA6[] = { 0x3FC2499A, 0xB5E4040B };
static u_int logA5[] = { 0xBFC555B5, 0x848CB7DB };
static u_int logA4[] = { 0x3FC99999, 0x987D8730 };
static u_int logA3[] = { 0xBFCFFFFF, 0xFF6F7E97 };
static u_int logA2[] = { 0x3FD55555, 0x555555A4 };
static u_int logA1[] = { 0xBFE00000, 0x00000008 };
static u_int logB5[] = { 0x3F175496, 0xADD7DAD6 };
static u_int logB4[] = { 0x3F3C71C2, 0xFE80C7E0 };
static u_int logB3[] = { 0x3F624924, 0x928BCCFF };
static u_int logB2[] = { 0x3F899999, 0x999995EC };
static u_int logB1[] = { 0x3FB55555, 0x55555555 };
/* sfpn = shortened fp number; can represent only positive numbers */
static struct sfpn {
int sp_exp;
u_int sp_m0, sp_m1;
} logtbl[] = {
{ 0x3FFE - 0x3fff, 0xFE03F80FU, 0xE03F80FEU },
{ 0x3FF7 - 0x3fff, 0xFF015358U, 0x833C47E2U },
{ 0x3FFE - 0x3fff, 0xFA232CF2U, 0x52138AC0U },
{ 0x3FF9 - 0x3fff, 0xBDC8D83EU, 0xAD88D549U },
{ 0x3FFE - 0x3fff, 0xF6603D98U, 0x0F6603DAU },
{ 0x3FFA - 0x3fff, 0x9CF43DCFU, 0xF5EAFD48U },
{ 0x3FFE - 0x3fff, 0xF2B9D648U, 0x0F2B9D65U },
{ 0x3FFA - 0x3fff, 0xDA16EB88U, 0xCB8DF614U },
{ 0x3FFE - 0x3fff, 0xEF2EB71FU, 0xC4345238U },
{ 0x3FFB - 0x3fff, 0x8B29B775U, 0x1BD70743U },
{ 0x3FFE - 0x3fff, 0xEBBDB2A5U, 0xC1619C8CU },
{ 0x3FFB - 0x3fff, 0xA8D839F8U, 0x30C1FB49U },
{ 0x3FFE - 0x3fff, 0xE865AC7BU, 0x7603A197U },
{ 0x3FFB - 0x3fff, 0xC61A2EB1U, 0x8CD907ADU },
{ 0x3FFE - 0x3fff, 0xE525982AU, 0xF70C880EU },
{ 0x3FFB - 0x3fff, 0xE2F2A47AU, 0xDE3A18AFU },
{ 0x3FFE - 0x3fff, 0xE1FC780EU, 0x1FC780E2U },
{ 0x3FFB - 0x3fff, 0xFF64898EU, 0xDF55D551U },
{ 0x3FFE - 0x3fff, 0xDEE95C4CU, 0xA037BA57U },
{ 0x3FFC - 0x3fff, 0x8DB956A9U, 0x7B3D0148U },
{ 0x3FFE - 0x3fff, 0xDBEB61EEU, 0xD19C5958U },
{ 0x3FFC - 0x3fff, 0x9B8FE100U, 0xF47BA1DEU },
{ 0x3FFE - 0x3fff, 0xD901B203U, 0x6406C80EU },
{ 0x3FFC - 0x3fff, 0xA9372F1DU, 0x0DA1BD17U },
{ 0x3FFE - 0x3fff, 0xD62B80D6U, 0x2B80D62CU },
{ 0x3FFC - 0x3fff, 0xB6B07F38U, 0xCE90E46BU },
{ 0x3FFE - 0x3fff, 0xD3680D36U, 0x80D3680DU },
{ 0x3FFC - 0x3fff, 0xC3FD0329U, 0x06488481U },
{ 0x3FFE - 0x3fff, 0xD0B69FCBU, 0xD2580D0BU },
{ 0x3FFC - 0x3fff, 0xD11DE0FFU, 0x15AB18CAU },
{ 0x3FFE - 0x3fff, 0xCE168A77U, 0x25080CE1U },
{ 0x3FFC - 0x3fff, 0xDE1433A1U, 0x6C66B150U },
{ 0x3FFE - 0x3fff, 0xCB8727C0U, 0x65C393E0U },
{ 0x3FFC - 0x3fff, 0xEAE10B5AU, 0x7DDC8ADDU },
{ 0x3FFE - 0x3fff, 0xC907DA4EU, 0x871146ADU },
{ 0x3FFC - 0x3fff, 0xF7856E5EU, 0xE2C9B291U },
{ 0x3FFE - 0x3fff, 0xC6980C69U, 0x80C6980CU },
{ 0x3FFD - 0x3fff, 0x82012CA5U, 0xA68206D7U },
{ 0x3FFE - 0x3fff, 0xC4372F85U, 0x5D824CA6U },
{ 0x3FFD - 0x3fff, 0x882C5FCDU, 0x7256A8C5U },
{ 0x3FFE - 0x3fff, 0xC1E4BBD5U, 0x95F6E947U },
{ 0x3FFD - 0x3fff, 0x8E44C60BU, 0x4CCFD7DEU },
{ 0x3FFE - 0x3fff, 0xBFA02FE8U, 0x0BFA02FFU },
{ 0x3FFD - 0x3fff, 0x944AD09EU, 0xF4351AF6U },
{ 0x3FFE - 0x3fff, 0xBD691047U, 0x07661AA3U },
{ 0x3FFD - 0x3fff, 0x9A3EECD4U, 0xC3EAA6B2U },
{ 0x3FFE - 0x3fff, 0xBB3EE721U, 0xA54D880CU },
{ 0x3FFD - 0x3fff, 0xA0218434U, 0x353F1DE8U },
{ 0x3FFE - 0x3fff, 0xB92143FAU, 0x36F5E02EU },
{ 0x3FFD - 0x3fff, 0xA5F2FCABU, 0xBBC506DAU },
{ 0x3FFE - 0x3fff, 0xB70FBB5AU, 0x19BE3659U },
{ 0x3FFD - 0x3fff, 0xABB3B8BAU, 0x2AD362A5U },
{ 0x3FFE - 0x3fff, 0xB509E68AU, 0x9B94821FU },
{ 0x3FFD - 0x3fff, 0xB1641795U, 0xCE3CA97BU },
{ 0x3FFE - 0x3fff, 0xB30F6352U, 0x8917C80BU },
{ 0x3FFD - 0x3fff, 0xB7047551U, 0x5D0F1C61U },
{ 0x3FFE - 0x3fff, 0xB11FD3B8U, 0x0B11FD3CU },
{ 0x3FFD - 0x3fff, 0xBC952AFEU, 0xEA3D13E1U },
{ 0x3FFE - 0x3fff, 0xAF3ADDC6U, 0x80AF3ADEU },
{ 0x3FFD - 0x3fff, 0xC2168ED0U, 0xF458BA4AU },
{ 0x3FFE - 0x3fff, 0xAD602B58U, 0x0AD602B6U },
{ 0x3FFD - 0x3fff, 0xC788F439U, 0xB3163BF1U },
{ 0x3FFE - 0x3fff, 0xAB8F69E2U, 0x8359CD11U },
{ 0x3FFD - 0x3fff, 0xCCECAC08U, 0xBF04565DU },
{ 0x3FFE - 0x3fff, 0xA9C84A47U, 0xA07F5638U },
{ 0x3FFD - 0x3fff, 0xD2420487U, 0x2DD85160U },
{ 0x3FFE - 0x3fff, 0xA80A80A8U, 0x0A80A80BU },
{ 0x3FFD - 0x3fff, 0xD7894992U, 0x3BC3588AU },
{ 0x3FFE - 0x3fff, 0xA655C439U, 0x2D7B73A8U },
{ 0x3FFD - 0x3fff, 0xDCC2C4B4U, 0x9887DACCU },
{ 0x3FFE - 0x3fff, 0xA4A9CF1DU, 0x96833751U },
{ 0x3FFD - 0x3fff, 0xE1EEBD3EU, 0x6D6A6B9EU },
{ 0x3FFE - 0x3fff, 0xA3065E3FU, 0xAE7CD0E0U },
{ 0x3FFD - 0x3fff, 0xE70D785CU, 0x2F9F5BDCU },
{ 0x3FFE - 0x3fff, 0xA16B312EU, 0xA8FC377DU },
{ 0x3FFD - 0x3fff, 0xEC1F392CU, 0x5179F283U },
{ 0x3FFE - 0x3fff, 0x9FD809FDU, 0x809FD80AU },
{ 0x3FFD - 0x3fff, 0xF12440D3U, 0xE36130E6U },
{ 0x3FFE - 0x3fff, 0x9E4CAD23U, 0xDD5F3A20U },
{ 0x3FFD - 0x3fff, 0xF61CCE92U, 0x346600BBU },
{ 0x3FFE - 0x3fff, 0x9CC8E160U, 0xC3FB19B9U },
{ 0x3FFD - 0x3fff, 0xFB091FD3U, 0x8145630AU },
{ 0x3FFE - 0x3fff, 0x9B4C6F9EU, 0xF03A3CAAU },
{ 0x3FFD - 0x3fff, 0xFFE97042U, 0xBFA4C2ADU },
{ 0x3FFE - 0x3fff, 0x99D722DAU, 0xBDE58F06U },
{ 0x3FFE - 0x3fff, 0x825EFCEDU, 0x49369330U },
{ 0x3FFE - 0x3fff, 0x9868C809U, 0x868C8098U },
{ 0x3FFE - 0x3fff, 0x84C37A7AU, 0xB9A905C9U },
{ 0x3FFE - 0x3fff, 0x97012E02U, 0x5C04B809U },
{ 0x3FFE - 0x3fff, 0x87224C2EU, 0x8E645FB7U },
{ 0x3FFE - 0x3fff, 0x95A02568U, 0x095A0257U },
{ 0x3FFE - 0x3fff, 0x897B8CACU, 0x9F7DE298U },
{ 0x3FFE - 0x3fff, 0x94458094U, 0x45809446U },
{ 0x3FFE - 0x3fff, 0x8BCF55DEU, 0xC4CD05FEU },
{ 0x3FFE - 0x3fff, 0x92F11384U, 0x0497889CU },
{ 0x3FFE - 0x3fff, 0x8E1DC0FBU, 0x89E125E5U },
{ 0x3FFE - 0x3fff, 0x91A2B3C4U, 0xD5E6F809U },
{ 0x3FFE - 0x3fff, 0x9066E68CU, 0x955B6C9BU },
{ 0x3FFE - 0x3fff, 0x905A3863U, 0x3E06C43BU },
{ 0x3FFE - 0x3fff, 0x92AADE74U, 0xC7BE59E0U },
{ 0x3FFE - 0x3fff, 0x8F1779D9U, 0xFDC3A219U },
{ 0x3FFE - 0x3fff, 0x94E9BFF6U, 0x15845643U },
{ 0x3FFE - 0x3fff, 0x8DDA5202U, 0x37694809U },
{ 0x3FFE - 0x3fff, 0x9723A1B7U, 0x20134203U },
{ 0x3FFE - 0x3fff, 0x8CA29C04U, 0x6514E023U },
{ 0x3FFE - 0x3fff, 0x995899C8U, 0x90EB8990U },
{ 0x3FFE - 0x3fff, 0x8B70344AU, 0x139BC75AU },
{ 0x3FFE - 0x3fff, 0x9B88BDAAU, 0x3A3DAE2FU },
{ 0x3FFE - 0x3fff, 0x8A42F870U, 0x5669DB46U },
{ 0x3FFE - 0x3fff, 0x9DB4224FU, 0xFFE1157CU },
{ 0x3FFE - 0x3fff, 0x891AC73AU, 0xE9819B50U },
{ 0x3FFE - 0x3fff, 0x9FDADC26U, 0x8B7A12DAU },
{ 0x3FFE - 0x3fff, 0x87F78087U, 0xF78087F8U },
{ 0x3FFE - 0x3fff, 0xA1FCFF17U, 0xCE733BD4U },
{ 0x3FFE - 0x3fff, 0x86D90544U, 0x7A34ACC6U },
{ 0x3FFE - 0x3fff, 0xA41A9E8FU, 0x5446FB9FU },
{ 0x3FFE - 0x3fff, 0x85BF3761U, 0x2CEE3C9BU },
{ 0x3FFE - 0x3fff, 0xA633CD7EU, 0x6771CD8BU },
{ 0x3FFE - 0x3fff, 0x84A9F9C8U, 0x084A9F9DU },
{ 0x3FFE - 0x3fff, 0xA8489E60U, 0x0B435A5EU },
{ 0x3FFE - 0x3fff, 0x83993052U, 0x3FBE3368U },
{ 0x3FFE - 0x3fff, 0xAA59233CU, 0xCCA4BD49U },
{ 0x3FFE - 0x3fff, 0x828CBFBEU, 0xB9A020A3U },
{ 0x3FFE - 0x3fff, 0xAC656DAEU, 0x6BCC4985U },
{ 0x3FFE - 0x3fff, 0x81848DA8U, 0xFAF0D277U },
{ 0x3FFE - 0x3fff, 0xAE6D8EE3U, 0x60BB2468U },
{ 0x3FFE - 0x3fff, 0x80808080U, 0x80808081U },
{ 0x3FFE - 0x3fff, 0xB07197A2U, 0x3C46C654U },
};
static struct fpn *__fpu_logn __P((struct fpemu *fe));
/*
* natural log - algorithm taken from Motorola FPSP,
* except this doesn't bother to check for invalid input.
*/
static struct fpn *
__fpu_logn(fe)
struct fpemu *fe;
{
static struct fpn X, F, U, V, W, KLOG2;
struct fpn *d;
int i, k;
CPYFPN(&X, &fe->fe_f2);
/* see if |X-1| < 1/16 approx. */
if ((-1 == X.fp_exp && (0xf07d0000U >> (31 - FP_LG)) <= X.fp_mant[0]) ||
(0 == X.fp_exp && X.fp_mant[0] <= (0x88410000U >> (31 - FP_LG)))) {
/* log near 1 */
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH)
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: log near 1\n");
fpu_const(&fe->fe_f1, 0x32);
/* X+1 */
d = fpu_add(fe);
CPYFPN(&V, d);
CPYFPN(&fe->fe_f1, &X);
fpu_const(&fe->fe_f2, 0x32); /* 1.0 */
fe->fe_f2.fp_sign = 1; /* -1.0 */
/* X-1 */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
/* 2(X-1) */
fe->fe_f1.fp_exp++; /* *= 2 */
CPYFPN(&fe->fe_f2, &V);
/* U=2(X-1)/(X+1) */
d = fpu_div(fe);
CPYFPN(&U, d);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, d);
/* V=U*U */
d = fpu_mul(fe);
CPYFPN(&V, d);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, d);
/* W=V*V */
d = fpu_mul(fe);
CPYFPN(&W, d);
/* calculate U+U*V*([B1+W*(B3+W*B5)]+[V*(B2+W*B4)]) */
/* B1+W*(B3+W*B5) part */
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logB5);
/* W*B5 */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logB3);
/* B3+W*B5 */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &W);
/* W*(B3+W*B5) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logB1);
/* B1+W*(B3+W*B5) */
d = fpu_add(fe);
CPYFPN(&X, d);
/* [V*(B2+W*B4)] part */
CPYFPN(&fe->fe_f1, &W);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logB4);
/* W*B4 */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logB2);
/* B2+W*B4 */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &V);
/* V*(B2+W*B4) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &X);
/* B1+W*(B3+W*B5)+V*(B2+W*B4) */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &V);
/* V*(B1+W*(B3+W*B5)+V*(B2+W*B4)) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &U);
/* U*V*(B1+W*(B3+W*B5)+V*(B2+W*B4)) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &U);
/* U+U*V*(B1+W*(B3+W*B5)+V*(B2+W*B4)) */
d = fpu_add(fe);
} else /* the usual case */ {
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH)
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: the usual case. X=(%d,%08x,%08x...)\n",
X.fp_exp, X.fp_mant[0], X.fp_mant[1]);
k = X.fp_exp;
/* X <- Y */
X.fp_exp = fe->fe_f2.fp_exp = 0;
/* get the most significant 7 bits of X */
F.fp_class = FPC_NUM;
F.fp_sign = 0;
F.fp_exp = X.fp_exp;
F.fp_mant[0] = X.fp_mant[0] & (0xfe000000U >> (31 - FP_LG));
F.fp_mant[0] |= (0x01000000U >> (31 - FP_LG));
F.fp_mant[1] = F.fp_mant[2] = F.fp_mant[3] = 0;
F.fp_sticky = 0;
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH) {
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: X=Y*2^k=(%d,%08x,%08x...)*2^%d\n",
fe->fe_f2.fp_exp, fe->fe_f2.fp_mant[0],
fe->fe_f2.fp_mant[1], k);
printf("__fpu_logn: F=(%d,%08x,%08x...)\n",
F.fp_exp, F.fp_mant[0], F.fp_mant[1]);
}
/* index to the table */
i = (F.fp_mant[0] >> (FP_LG - 7)) & 0x7e;
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH)
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: index to logtbl i=%d(%x)\n", i, i);
CPYFPN(&fe->fe_f1, &F);
/* -F */
fe->fe_f1.fp_sign = 1;
/* Y-F */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
/* fe_f2 = 1/F */
fe->fe_f2.fp_class = FPC_NUM;
fe->fe_f2.fp_sign = fe->fe_f2.fp_sticky = fe->fe_f2.fp_mant[3] = 0;
fe->fe_f2.fp_exp = logtbl[i].sp_exp;
fe->fe_f2.fp_mant[0] = (logtbl[i].sp_m0 >> (31 - FP_LG));
fe->fe_f2.fp_mant[1] = (logtbl[i].sp_m0 << (FP_LG + 1)) |
(logtbl[i].sp_m1 >> (31 - FP_LG));
fe->fe_f2.fp_mant[2] = (u_int)(logtbl[i].sp_m1 << (FP_LG + 1));
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH)
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: 1/F=(%d,%08x,%08x...)\n", fe->fe_f2.fp_exp,
fe->fe_f2.fp_mant[0], fe->fe_f2.fp_mant[1]);
/* U = (Y-F) * (1/F) */
d = fpu_mul(fe);
CPYFPN(&U, d);
/* KLOG2 = K * ln(2) */
/* fe_f1 == (fpn)k */
fpu_explode(fe, &fe->fe_f1, FTYPE_LNG, &k);
(void)fpu_const(&fe->fe_f2, 0x30 /* ln(2) */);
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH) {
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: fp(k)=(%d,%08x,%08x...)\n", fe->fe_f1.fp_exp,
fe->fe_f1.fp_mant[0], fe->fe_f1.fp_mant[1]);
printf("__fpu_logn: ln(2)=(%d,%08x,%08x...)\n", fe->fe_f2.fp_exp,
fe->fe_f2.fp_mant[0], fe->fe_f2.fp_mant[1]);
}
/* K * LOGOF2 */
d = fpu_mul(fe);
CPYFPN(&KLOG2, d);
/* V=U*U */
CPYFPN(&fe->fe_f1, &U);
CPYFPN(&fe->fe_f2, &U);
d = fpu_mul(fe);
CPYFPN(&V, d);
/*
* approximation of LOG(1+U) by
* (U+V*(A1+V*(A3+V*A5)))+(U*V*(A2+V*(A4+V*A6)))
*/
/* (U+V*(A1+V*(A3+V*A5))) part */
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logA5);
/* V*A5 */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logA3);
/* A3+V*A5 */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &V);
/* V*(A3+V*A5) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logA1);
/* A1+V*(A3+V*A5) */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &V);
/* V*(A1+V*(A3+V*A5)) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &U);
/* U+V*(A1+V*(A3+V*A5)) */
d = fpu_add(fe);
CPYFPN(&X, d);
/* (U*V*(A2+V*(A4+V*A6))) part */
CPYFPN(&fe->fe_f1, &V);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logA6);
/* V*A6 */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logA4);
/* A4+V*A6 */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &V);
/* V*(A4+V*A6) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
fpu_explode(fe, &fe->fe_f2, FTYPE_DBL, logA2);
/* A2+V*(A4+V*A6) */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &V);
/* V*(A2+V*(A4+V*A6)) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &U);
/* U*V*(A2+V*(A4+V*A6)) */
d = fpu_mul(fe);
CPYFPN(&fe->fe_f1, d);
i++;
/* fe_f2 = logtbl[i+1] (== LOG(F)) */
fe->fe_f2.fp_class = FPC_NUM;
fe->fe_f2.fp_sign = fe->fe_f2.fp_sticky = fe->fe_f2.fp_mant[3] = 0;
fe->fe_f2.fp_exp = logtbl[i].sp_exp;
fe->fe_f2.fp_mant[0] = (logtbl[i].sp_m0 >> (31 - FP_LG));
fe->fe_f2.fp_mant[1] = (logtbl[i].sp_m0 << (FP_LG + 1)) |
(logtbl[i].sp_m1 >> (31 - FP_LG));
fe->fe_f2.fp_mant[2] = (logtbl[i].sp_m1 << (FP_LG + 1));
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH)
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: ln(F)=(%d,%08x,%08x,...)\n", fe->fe_f2.fp_exp,
fe->fe_f2.fp_mant[0], fe->fe_f2.fp_mant[1]);
/* LOG(F)+U*V*(A2+V*(A4+V*A6)) */
d = fpu_add(fe);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &X);
/* LOG(F)+U+V*(A1+V*(A3+V*A5))+U*V*(A2+V*(A4+V*A6)) */
d = fpu_add(fe);
Fixes from Ken Nakata. Mainly renaming debug_level to fpu_debug_level.
1995-11-05 03:35:09 +03:00
if (fpu_debug_level & DL_ARITH)
Still incomplete, but much more complete FPE from Ken Nakata <kenn@remus.rutgers.edu>. This emulator does not yet emulate the following functions: FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN, FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS It is sufficient, however, to allow programs like df, w, and newfs, to run to completion with correct results. Portions of this code were based on the sparc fpe and on initial work by gwr.
1995-11-03 07:46:55 +03:00
printf("__fpu_logn: ln(Y)=(%c,%d,%08x,%08x,%08x,%08x)\n",
d->fp_sign ? '-' : '+', d->fp_exp,
d->fp_mant[0], d->fp_mant[1], d->fp_mant[2], d->fp_mant[3]);
CPYFPN(&fe->fe_f1, d);
CPYFPN(&fe->fe_f2, &KLOG2);
/* K*LOGOF2+LOG(F)+U+V*(A1+V*(A3+V*A5))+U*V*(A2+V*(A4+V*A6)) */
d = fpu_add(fe);
}
return d;
}
struct fpn *
fpu_log10(fe)
struct fpemu *fe;
{
struct fpn *fp = &fe->fe_f2;
u_int fpsr;
fpsr = fe->fe_fpsr & ~FPSR_EXCP; /* clear all exceptions */
if (fp->fp_class >= FPC_NUM) {
if (fp->fp_sign) { /* negative number or Inf */
fp = fpu_newnan(fe);
fpsr |= FPSR_OPERR;
} else if (fp->fp_class == FPC_NUM) {
/* the real work here */
fp = __fpu_logn(fe);
if (fp != &fe->fe_f1)
CPYFPN(&fe->fe_f1, fp);
(void)fpu_const(&fe->fe_f2, 0x31 /* ln(10) */);
fp = fpu_div(fe);
} /* else if fp == +Inf, return +Inf */
} else if (fp->fp_class == FPC_ZERO) {
/* return -Inf */
fp->fp_class = FPC_INF;
fp->fp_sign = 1;
fpsr |= FPSR_DZ;
} else if (fp->fp_class == FPC_SNAN) {
fpsr |= FPSR_SNAN;
fp = fpu_newnan(fe);
} else {
fp = fpu_newnan(fe);
}
fe->fe_fpsr = fpsr;
return fp;
}
struct fpn *
fpu_log2(fe)
struct fpemu *fe;
{
struct fpn *fp = &fe->fe_f2;
u_int fpsr;
fpsr = fe->fe_fpsr & ~FPSR_EXCP; /* clear all exceptions */
if (fp->fp_class >= FPC_NUM) {
if (fp->fp_sign) { /* negative number or Inf */
fp = fpu_newnan(fe);
fpsr |= FPSR_OPERR;
} else if (fp->fp_class == FPC_NUM) {
/* the real work here */
if (fp->fp_mant[0] == FP_1 && fp->fp_mant[1] == 0 &&
fp->fp_mant[2] == 0 && fp->fp_mant[3] == 0) {
/* fp == 2.0 ^ exp <--> log2(fp) == exp */
fpu_explode(fe, &fe->fe_f3, FTYPE_LNG, &fp->fp_exp);
fp = &fe->fe_f3;
} else {
fp = __fpu_logn(fe);
if (fp != &fe->fe_f1)
CPYFPN(&fe->fe_f1, fp);
(void)fpu_const(&fe->fe_f2, 0x30 /* ln(2) */);
fp = fpu_div(fe);
}
} /* else if fp == +Inf, return +Inf */
} else if (fp->fp_class == FPC_ZERO) {
/* return -Inf */
fp->fp_class = FPC_INF;
fp->fp_sign = 1;
fpsr |= FPSR_DZ;
} else if (fp->fp_class == FPC_SNAN) {
fpsr |= FPSR_SNAN;
fp = fpu_newnan(fe);
} else {
fp = fpu_newnan(fe);
}
fe->fe_fpsr = fpsr;
return fp;
}
struct fpn *
fpu_logn(fe)
struct fpemu *fe;
{
struct fpn *fp = &fe->fe_f2;
u_int fpsr;
fpsr = fe->fe_fpsr & ~FPSR_EXCP; /* clear all exceptions */
if (fp->fp_class >= FPC_NUM) {
if (fp->fp_sign) { /* negative number or Inf */
fp = fpu_newnan(fe);
fpsr |= FPSR_OPERR;
} else if (fp->fp_class == FPC_NUM) {
/* the real work here */
fp = __fpu_logn(fe);
} /* else if fp == +Inf, return +Inf */
} else if (fp->fp_class == FPC_ZERO) {
/* return -Inf */
fp->fp_class = FPC_INF;
fp->fp_sign = 1;
fpsr |= FPSR_DZ;
} else if (fp->fp_class == FPC_SNAN) {
fpsr |= FPSR_SNAN;
fp = fpu_newnan(fe);
} else {
fp = fpu_newnan(fe);
}
fe->fe_fpsr = fpsr;
return fp;
}
struct fpn *
fpu_lognp1(fe)
struct fpemu *fe;
{
struct fpn *fp;
/* build a 1.0 */
fp = fpu_const(&fe->fe_f1, 0x32); /* get 1.0 */
/* fp = 1.0 + f2 */
fp = fpu_add(fe);
/* copy the result to the src opr */
if (&fe->fe_f2 != fp)
CPYFPN(&fe->fe_f2, fp);
return fpu_logn(fe);
}
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