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| 2 | pj | 1 | /* |
| 2 | * Copyright (c) 1993,94 Winning Strategies, Inc. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. All advertising materials mentioning features or use of this software |
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| 14 | * must display the following acknowledgement: |
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| 15 | * This product includes software developed by Winning Strategies, Inc. |
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| 16 | * 4. The name of the author may not be used to endorse or promote products |
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| 17 | * derived from this software without specific prior written permission |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |||
| 31 | /* |
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| 32 | * Written by: |
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| 33 | * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. |
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| 34 | */ |
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| 35 | |||
| 36 | #include <machine/asmacros.h> |
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| 37 | |||
| 38 | RCSID("$\Id: s_log1p.S,v 1.3 1994/08/19 23:52:29 jkh Exp $") |
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| 39 | |||
| 40 | /* |
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| 41 | * The fyl2xp1 instruction has such a limited range: |
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| 42 | * -(1 - (sqrt(2) / 2)) <= x <= sqrt(2) - 1 |
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| 43 | * it's not worth trying to use it. |
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| 44 | * |
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| 45 | * Also, I'm not sure fyl2xp1's extra precision will |
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| 46 | * matter once the result is converted from extended |
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| 47 | * real (80 bits) back to double real (64 bits). |
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| 48 | */ |
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| 49 | ENTRY(log1p) |
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| 50 | fldln2 |
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| 51 | fldl 4(%esp) |
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| 52 | fld1 |
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| 53 | faddp |
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| 54 | fyl2x |
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| 55 | ret |