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98 lines
2.9 KiB
ArmAsm
98 lines
2.9 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PURPOSE: Run-Time Library
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* FILE: lib/rtl/i386/allshr.S
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* PROGRAMER: Alex Ionescu (alex@relsoft.net)
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*
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* Copyright (C) 2002 Michael Ringgaard.
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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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*
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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. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES// LOSS OF USE, DATA, OR PROFITS// OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <asm.inc>
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PUBLIC __allshr
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/* FUNCTIONS ***************************************************************/
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.code
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//
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// llshr - long shift right
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//
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// Purpose:
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// Does a signed Long Shift Right
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// Shifts a long right any number of bits.
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//
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// Entry:
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// EDX:EAX - long value to be shifted
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// CL - number of bits to shift by
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//
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// Exit:
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// EDX:EAX - shifted value
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//
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// Uses:
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// CL is destroyed.
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//
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__allshr:
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//
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// Handle shifts of 64 bits or more (if shifting 64 bits or more, the result
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// depends only on the high order bit of edx).
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//
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cmp cl,64
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jae short .RETSIGN
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//
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// Handle shifts of between 0 and 31 bits
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//
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cmp cl, 32
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jae short .MORE32
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shrd eax,edx,cl
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sar edx,cl
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ret
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//
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// Handle shifts of between 32 and 63 bits
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//
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.MORE32:
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mov eax,edx
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sar edx,31
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and cl,31
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sar eax,cl
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ret
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//
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// Return double precision 0 or -1, depending on the sign of edx
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//
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.RETSIGN:
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sar edx,31
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mov eax,edx
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ret
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END
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