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79 lines
1.3 KiB
79 lines
1.3 KiB
;/***
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;*fabs.a -
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;*
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;* Copyright (c) 1991-91, Microsoft Corporation
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;*
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;*Purpose:
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;*
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;*
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;*Revision History:
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;*
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;* 05-12-92 PLM written
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;*/
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;
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;/***
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;*double fabs(double x)
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;*
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;*Purpose:
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;* Absolute value
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;*
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;*Entry:
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;*
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;*Exit:
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;*
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;*Exceptions:
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;*******************************************************************************/
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;
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;
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;double fabs(double x)
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#include <traps.a>
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#include <sane.a>
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#include <trans.a>
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cProc fabs,PUBLIC
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parmQ x
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localV xlocalx,10
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localD fpstat
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cBegin fabs
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#ifdef SANE
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pea fpstat
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move.w #FOPROCENTRY,-(a7)
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FP68K ;save current status & set default control
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pea x
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pea xlocalx
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move.w #FFDBL+FOZ2X,-(a7)
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FP68K ;convert to extended
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pea xlocalx
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move.w #FOABS,-(a7)
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FP68K ;absolute value
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lea xlocalx,a1
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move.w (a1)+,d0 ;load result for return
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move.l (a1)+,d1
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move.l (a1),a0
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pea fpstat
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move.w #FOPROCEXIT,-(a7)
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FP68K ;set result status & restore control
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#else
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fmove.l fpcr,d0 ;save current control word
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fmove.d x, fp0
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ftst.x fp0 ;see if it is a valid number
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fmove.l fpsr, d1 ;get status word
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and.l #0x03007c00, d1 ;see if we get an exception
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cmp.l #0, d1
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ifneq
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jbsr __Domain_error ; if not equal, domain error
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else
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fmove.l #0,fpcr
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fabs.d x,fp0 ;absolute value
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endif
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fmove.l d0,fpcr ;restore control word
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#endif
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cEnd fabs
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