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The fyl2xp1 instruction has such a limited range: -(1 - (sqrt(2) / 2)) <= x <= sqrt(2) - 1 it's not worth trying to use it. Also, I'm not sure fyl2xp1's extra precision will matter once the result is converted from extended real (80 bits) back to double real (64 bits). Reviewed by: jkh Submitted by: jtc
56 lines
2.2 KiB
ArmAsm
56 lines
2.2 KiB
ArmAsm
/*
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* Copyright (c) 1993,94 Winning Strategies, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Winning Strategies, Inc.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Written by:
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* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
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*/
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#include <machine/asmacros.h>
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RCSID("$Id: s_log1p.S,v 1.4 1994/08/19 03:55:57 jtc Exp $")
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/*
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* The fyl2xp1 instruction has such a limited range:
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* -(1 - (sqrt(2) / 2)) <= x <= sqrt(2) - 1
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* it's not worth trying to use it.
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*
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* Also, I'm not sure fyl2xp1's extra precision will
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* matter once the result is converted from extended
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* real (80 bits) back to double real (64 bits).
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*/
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ENTRY(log1p)
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fldln2
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fldl 4(%esp)
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fld1
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faddp
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fyl2x
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ret
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