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Diffstat (limited to 'sys/gnu/i386/fpemul/poly_tan.c')
| -rw-r--r-- | sys/gnu/i386/fpemul/poly_tan.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/sys/gnu/i386/fpemul/poly_tan.c b/sys/gnu/i386/fpemul/poly_tan.c deleted file mode 100644 index 7dbbddf..0000000 --- a/sys/gnu/i386/fpemul/poly_tan.c +++ /dev/null @@ -1,227 +0,0 @@ -/* - * poly_tan.c - * - * Compute the tan of a FPU_REG, using a polynomial approximation. - * - * - * Copyright (C) 1992,1993,1994 - * W. Metzenthen, 22 Parker St, Ormond, Vic 3163, - * Australia. E-mail billm@vaxc.cc.monash.edu.au - * All rights reserved. - * - * This copyright notice covers the redistribution and use of the - * FPU emulator developed by W. Metzenthen. It covers only its use - * in the 386BSD, FreeBSD and NetBSD operating systems. Any other - * use is not permitted under this copyright. - * - * 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 include information specifying - * that source code for the emulator is freely available and include - * either: - * a) an offer to provide the source code for a nominal distribution - * fee, or - * b) list at least two alternative methods whereby the source - * can be obtained, e.g. a publically accessible bulletin board - * and an anonymous ftp site from which the software can be - * downloaded. - * 3. All advertising materials specifically mentioning features or use of - * this emulator must acknowledge that it was developed by W. Metzenthen. - * 4. The name of W. Metzenthen may not be used to endorse or promote - * products derived from this software without specific prior written - * permission. - * - * THIS SOFTWARE IS PROVIDED ``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 - * W. METZENTHEN 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. - * - * - * The purpose of this copyright, based upon the Berkeley copyright, is to - * ensure that the covered software remains freely available to everyone. - * - * The software (with necessary differences) is also available, but under - * the terms of the GNU copyleft, for the Linux operating system and for - * the djgpp ms-dos extender. - * - * W. Metzenthen June 1994. - * - * - * $FreeBSD$ - * - */ - -#include <gnu/i386/fpemul/reg_constant.h> -#include <gnu/i386/fpemul/control_w.h> - - -#define HIPOWERop 3 /* odd poly, positive terms */ -static unsigned short oddplterms[HIPOWERop][4] = -{ - {0x846a, 0x42d1, 0xb544, 0x921f}, - {0x6fb2, 0x0215, 0x95c0, 0x099c}, - {0xfce6, 0x0cc8, 0x1c9a, 0x0000} -}; -#define HIPOWERon 2 /* odd poly, negative terms */ -static unsigned short oddnegterms[HIPOWERon][4] = -{ - {0x6906, 0xe205, 0x25c8, 0x8838}, - {0x1dd7, 0x3fe3, 0x944e, 0x002c} -}; -#define HIPOWERep 2 /* even poly, positive terms */ -static unsigned short evenplterms[HIPOWERep][4] = -{ - {0xdb8f, 0x3761, 0x1432, 0x2acf}, - {0x16eb, 0x13c1, 0x3099, 0x0003} -}; -#define HIPOWERen 2 /* even poly, negative terms */ -static unsigned short evennegterms[HIPOWERen][4] = -{ - {0x3a7c, 0xe4c5, 0x7f87, 0x2945}, - {0x572b, 0x664c, 0xc543, 0x018c} -}; - - -/*--- poly_tan() ------------------------------------------------------------+ - | | - +---------------------------------------------------------------------------*/ -void -poly_tan(FPU_REG * arg, FPU_REG * y_reg) -{ - char invert = 0; - short exponent; - FPU_REG odd_poly, even_poly, pos_poly, neg_poly; - FPU_REG argSq; - long long arg_signif, argSqSq; - - - exponent = arg->exp - EXP_BIAS; - - if (arg->tag == TW_Zero) { - /* Return 0.0 */ - reg_move(&CONST_Z, y_reg); - return; - } - if (exponent >= -1) { - /* argument is in the range [0.5 .. 1.0] */ - if (exponent >= 0) { -#ifdef PARANOID - if ((exponent == 0) && - (arg->sigl == 0) && (arg->sigh == 0x80000000)) -#endif /* PARANOID */ - { - arith_overflow(y_reg); - return; - } -#ifdef PARANOID - EXCEPTION(EX_INTERNAL | 0x104); /* There must be a logic - * error */ - return; -#endif /* PARANOID */ - } - /* The argument is in the range [0.5 .. 1.0) */ - /* Convert the argument to a number in the range (0.0 .. 0.5] */ - *((long long *) (&arg->sigl)) = -*((long long *) (&arg->sigl)); - normalize(arg); /* Needed later */ - exponent = arg->exp - EXP_BIAS; - invert = 1; - } -#ifdef PARANOID - if (arg->sign != 0) { /* Can't hack a number < 0.0 */ - arith_invalid(y_reg); - return; - } /* Need a positive number */ -#endif /* PARANOID */ - - *(long long *) &arg_signif = *(long long *) &(arg->sigl); - if (exponent < -1) { - /* shift the argument right by the required places */ - if (shrx(&arg_signif, -1 - exponent) >= (unsigned)0x80000000) - arg_signif++; /* round up */ - } - mul64(&arg_signif, &arg_signif, (long long *) (&argSq.sigl)); - mul64((long long *) (&argSq.sigl), (long long *) (&argSq.sigl), &argSqSq); - - /* will be a valid positive nr with expon = 0 */ - *(short *) &(pos_poly.sign) = 0; - pos_poly.exp = EXP_BIAS; - - /* Do the basic fixed point polynomial evaluation */ - polynomial((u_int *) &pos_poly.sigl, (unsigned *) &argSqSq, oddplterms, HIPOWERop - 1); - - /* will be a valid positive nr with expon = 0 */ - *(short *) &(neg_poly.sign) = 0; - neg_poly.exp = EXP_BIAS; - - /* Do the basic fixed point polynomial evaluation */ - polynomial((u_int *) &neg_poly.sigl, (unsigned *) &argSqSq, oddnegterms, HIPOWERon - 1); - mul64((long long *) (&argSq.sigl), (long long *) (&neg_poly.sigl), - (long long *) (&neg_poly.sigl)); - - /* Subtract the mantissas */ - *((long long *) (&pos_poly.sigl)) -= *((long long *) (&neg_poly.sigl)); - - /* Convert to 64 bit signed-compatible */ - pos_poly.exp -= 1; - - reg_move(&pos_poly, &odd_poly); - normalize(&odd_poly); - - reg_mul(&odd_poly, arg, &odd_poly, FULL_PRECISION); - reg_u_add(&odd_poly, arg, &odd_poly, FULL_PRECISION); /* This is just the odd - * polynomial */ - - - /* will be a valid positive nr with expon = 0 */ - *(short *) &(pos_poly.sign) = 0; - pos_poly.exp = EXP_BIAS; - - /* Do the basic fixed point polynomial evaluation */ - polynomial((u_int *) &pos_poly.sigl, (unsigned *) &argSqSq, evenplterms, HIPOWERep - 1); - mul64((long long *) (&argSq.sigl), - (long long *) (&pos_poly.sigl), (long long *) (&pos_poly.sigl)); - - /* will be a valid positive nr with expon = 0 */ - *(short *) &(neg_poly.sign) = 0; - neg_poly.exp = EXP_BIAS; - - /* Do the basic fixed point polynomial evaluation */ - polynomial((u_int *) &neg_poly.sigl, (unsigned *) &argSqSq, evennegterms, HIPOWERen - 1); - - /* Subtract the mantissas */ - *((long long *) (&neg_poly.sigl)) -= *((long long *) (&pos_poly.sigl)); - /* and multiply by argSq */ - - /* Convert argSq to a valid reg number */ - *(short *) &(argSq.sign) = 0; - argSq.exp = EXP_BIAS - 1; - normalize(&argSq); - - /* Convert to 64 bit signed-compatible */ - neg_poly.exp -= 1; - - reg_move(&neg_poly, &even_poly); - normalize(&even_poly); - - reg_mul(&even_poly, &argSq, &even_poly, FULL_PRECISION); - reg_add(&even_poly, &argSq, &even_poly, FULL_PRECISION); - reg_sub(&CONST_1, &even_poly, &even_poly, FULL_PRECISION); /* This is just the even - * polynomial */ - - /* Now ready to copy the results */ - if (invert) { - reg_div(&even_poly, &odd_poly, y_reg, FULL_PRECISION); - } else { - reg_div(&odd_poly, &even_poly, y_reg, FULL_PRECISION); - } - -} |
