84 lines
2.3 KiB
ArmAsm
84 lines
2.3 KiB
ArmAsm
/*
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* Copyright (c) 1994 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/_limits.h>
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#include <machine/asm.h>
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RCSID("$FreeBSD$")
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#define FP_ILOGB0 (-__INT_MAX)
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#define FP_ILOGBNAN __INT_MAX
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#define FP_ILOGBINF __INT_MAX
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ENTRY(ilogb)
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pushl %ebp
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movl %esp,%ebp
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subl $4,%esp
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fldl 8(%ebp)
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fxtract
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fstp %st(0)
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fistpl -4(%ebp)
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movl -4(%ebp),%eax
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/* fistpl yields __INT_MIN for NaN, Inf and 0. */
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cmpl $__INT_MIN,%eax
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je .L2
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.L1:
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leave
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ret
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.L2:
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fldl 8(%ebp)
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fldz
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fucompp
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fnstsw %ax
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sahf
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jp .L3
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jz .L4
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movl $FP_ILOGBINF,%eax
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jmp .L1
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.L3:
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movl $FP_ILOGBNAN,%eax
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jmp .L1
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.L4:
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movl $FP_ILOGB0,%eax
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jmp .L1
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