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121 lines
2.2 KiB
121 lines
2.2 KiB
;/***
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;*fmodl.a - fmodl(x,y)
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;*
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;* Copyright (c) 1991-1991, Microsoft Corporation. All rights reserved.
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;*
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;*Purpose:
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;* Log and power functions to be used with M68K version
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;*
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;*Revision History:
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;* 06-04-92 XY based on fmod.a
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;*
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;*******************************************************************************/
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#include <traps.a>
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#ifdef SANE
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#include <sane.a>
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#endif
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;long double fmodl(long double x, long double y) x to the y power
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externW _errno
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cProc fmodl,PUBLIC
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parmT x
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parmT y
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localW sign
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localW fpstat
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localV xlocalx,10
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localV ylocalx,10
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localW xtestw
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cBegin fmodl
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#ifdef SANE
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clr.w sign ;assume positive x
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btst #7,x
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ifne
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not.w sign ;x is negative
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endif
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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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lea y, a1
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move.w (a1)+, d0
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move.l (a1)+, d1
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move.l (a1)+, a0
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cmp.w #0, d0
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ifeq
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cmp.l #0, d1
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ifeq
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cmp.l #0, a0
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ifeq
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jra to_end ; return zero if y is zero
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endif
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endif
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endif
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lea x, a0
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lea xlocalx, a1
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move.w (a0)+, (a1)+
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move.l (a0)+, (a1)+
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move.l (a0)+, (a1)+
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pea y
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pea x
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move.w #FFEXT+FOREM,-(a7) ;remainder
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FP68K
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btst #7,x ;test sign of result
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ifne
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not.w sign
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endif
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tst.w sign ;test for correction
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ifne
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btst #7,xlocalx ;set y to sign of x
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ifne
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ori.b #0x80,y
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else
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andi.b #0x7f,y
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endif
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pea y
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pea x
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move.w #FFEXT+FOADD,-(a7)
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FP68K ;correct result to right sign
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endif
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lea x,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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to_end:
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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
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fmove.x 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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endif
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fmove.x y, 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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endif
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fmove.l #0,fpcr
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fmove.x x,fp0
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fmod.x y,fp0
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fmove.l d0,fpcr
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#endif
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cEnd fmodl
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