e_exp.S revision 16054
12116Sjkh/* 22116Sjkh * Copyright (c) 1993,94 Winning Strategies, Inc. 32116Sjkh * All rights reserved. 42116Sjkh * 52116Sjkh * Redistribution and use in source and binary forms, with or without 62116Sjkh * modification, are permitted provided that the following conditions 72116Sjkh * are met: 82116Sjkh * 1. Redistributions of source code must retain the above copyright 92116Sjkh * notice, this list of conditions and the following disclaimer. 102116Sjkh * 2. Redistributions in binary form must reproduce the above copyright 112116Sjkh * notice, this list of conditions and the following disclaimer in the 122116Sjkh * documentation and/or other materials provided with the distribution. 132116Sjkh * 3. All advertising materials mentioning features or use of this software 142116Sjkh * must display the following acknowledgement: 152116Sjkh * This product includes software developed by Winning Strategies, Inc. 162116Sjkh * 4. The name of the author may not be used to endorse or promote products 172116Sjkh * derived from this software without specific prior written permission. 182116Sjkh * 192116Sjkh * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 202116Sjkh * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 212116Sjkh * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 222116Sjkh * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 232116Sjkh * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 242116Sjkh * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 252116Sjkh * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 262116Sjkh * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 272116Sjkh * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 282116Sjkh * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 292116Sjkh */ 302116Sjkh 312116Sjkh/* 322116Sjkh * Written by: 332116Sjkh * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 342116Sjkh */ 352116Sjkh 362121Sjkh#include <machine/asmacros.h> 372116Sjkh 3816054SbdeRCSID("$Id: e_exp.S,v 1.2 1994/08/19 11:14:14 jkh Exp $") 392116Sjkh 402116Sjkh/* e^x = 2^(x * log2(e)) */ 412116SjkhENTRY(__ieee754_exp) 422116Sjkh fldl 4(%esp) 432116Sjkh fldl2e 442116Sjkh fmulp /* x * log2(e) */ 452116Sjkh fstl %st(1) 462116Sjkh frndint /* int(x * log2(e)) */ 472116Sjkh fstl %st(2) 482116Sjkh fsubrp /* fract(x * log2(e)) */ 492116Sjkh f2xm1 /* 2^(fract(x * log2(e))) - 1 */ 502116Sjkh fld1 512116Sjkh faddp /* 2^(fract(x * log2(e))) */ 522116Sjkh fscale /* e^x */ 5316054Sbde fstpl %st(1) 542116Sjkh ret 55