Rev 1618 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* |
| 2 | * Copyright (c) 1993,94 Winning Strategies, Inc. |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * 1. Redistributions of source code must retain the above copyright |
||
| 9 | * notice, this list of conditions and the following disclaimer. |
||
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
||
| 11 | * notice, this list of conditions and the following disclaimer in the |
||
| 12 | * documentation and/or other materials provided with the distribution. |
||
| 13 | * 3. All advertising materials mentioning features or use of this software |
||
| 14 | * must display the following acknowledgement: |
||
| 15 | * This product includes software developed by Winning Strategies, Inc. |
||
| 16 | * 4. The name of the author may not be used to endorse or promote products |
||
| 17 | * derived from this software without specific prior written permission. |
||
| 18 | * |
||
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 29 | */ |
||
| 30 | |||
| 31 | /* |
||
| 32 | * Written by: |
||
| 33 | * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. |
||
| 34 | */ |
||
| 35 | |||
| 36 | #include <machine/asmacros.h> |
||
| 37 | |||
| 38 | RCSID("$\Id: e_exp.S,v 1.2.6.3 1996/06/08 08:25:28 bde Exp $") |
||
| 39 | |||
| 40 | /* e^x = 2^(x * log2(e)) */ |
||
| 41 | ENTRY(__ieee754_exp) |
||
| 42 | fldl 4(%esp) |
||
| 43 | fldl2e |
||
| 44 | fmulp /* x * log2(e) */ |
||
| 45 | fstl %st(1) |
||
| 46 | frndint /* int(x * log2(e)) */ |
||
| 47 | fstl %st(2) |
||
| 48 | fsubrp /* fract(x * log2(e)) */ |
||
| 49 | f2xm1 /* 2^(fract(x * log2(e))) - 1 */ |
||
| 50 | fld1 |
||
| 51 | faddp /* 2^(fract(x * log2(e))) */ |
||
| 52 | fscale /* e^x */ |
||
| 53 | fstpl %st(1) |
||
| 54 | ret |