adtools/clib2

*
* :ts=8
*
* Adapted from reassembled SAS/C runtime library code.
*
* Portable ISO 'C' (1994) runtime library for the Amiga computer
* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*
*   - Neither the name of Olaf Barthel nor the names of contributors
*     may be used to endorse or promote products derived from this
*     software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*

    section    text,code

    xdef    __CXV54
    xref    __CXFERR

__CXV54:

    MOVEM.L    A0/A1,-(SP)
    MOVE.L    D4,A0
    SWAP    D0
    MOVE.W    D0,D4
    AND.W    #$8000,D4
    EOR.W    D4,D0
    SUB.W    #$3800,D0
    CMP.W    #$10,D0
    BLT    lab098
    CMP.W    #$FEF,D0
    BLT    lab102
    CMP.W    #$47F0,D0
    BLT    lab058
    SWAP    D0
    LSL.L    #3,D0
    ROL.L    #3,D1
    AND.L    #7,D1
    EOR.L    D1,D0
    SWAP    D0
    OR.W    #$7F80,D0
    BRA    lab112

lab058:    CMP.W    #$FF0,D0
    BGE    lab074
    CMP.L    #$FFFF0FEF,D0
    BNE    lab102
    CMP.L    #$F0000000,D1
    BCS    lab102

lab074:    MOVEM.L    D0/D1/A0/A1,-(SP)
    PEA    2.L
    JSR    __CXFERR
    ADDQ.W    #4,SP
    MOVEM.L    (SP)+,D0/D1/A0/A1
    MOVE.L    #$7F80,D0
    EOR.W    D4,D0
    SWAP    D0
    MOVEQ    #0,D1
    BRA    lab116

lab098:    CMP.W    #$FE90,D0
    BGE    lab0C4
    ADD.W    #$3800,D0
    OR.L    D1,D0
    BEQ    lab112
    MOVEM.L    D0/D1/A0/A1,-(SP)
    PEA    1.L
    JSR    __CXFERR
    ADDQ.W    #4,SP
    MOVEM.L    (SP)+,D0/D1/A0/A1
    MOVEQ    #0,D0
    BRA    lab112

lab0C4:    MOVE.L    D5,A1
    MOVE.W    D0,D5
    AND.W    #15,D0
    EOR.W    #$10,D0
    SWAP    D0
    ASR.W    #4,D5
    ADDQ.W    #2,D5
    BGE    lab0E6
    NEG.W    D5
    LSR.L    D5,D0
    MOVEQ    #0,D5
    ADDX.L    D5,D0
    BRA    lab0F6

lab0E6:    CLR.W    D1
    LSL.L    D5,D0
    ADDQ.W    #1,D5
    ROXL.L    D5,D1
    AND.L    #15,D1
    ADDX.L    D1,D0
lab0F6:    MOVE.L    A1,D5
    SWAP    D0
    EOR.W    D4,D0
    SWAP    D0
    BRA    lab116

lab102:    SWAP    D0
    LSL.L    #3,D0
    ROXL.L    #4,D1
    AND.L    #7,D1
    ADDX.L    D1,D0
    SWAP    D0
lab112:    EOR.W    D4,D0
    SWAP    D0
lab116:    MOVE.L    A0,D4
    MOVEM.L    (SP)+,A0/A1
    RTS

    end