atanl87.asm

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ifdef __386__
 .387
else
 .8087
endif
include mdef.inc
include struct.inc
include math387.inc

        modstart        atanl87

        xref            IF@DATAN
        xref            IF@DATAN2

        xdefp   atanl_  ; long double atanl( long double x )
        xdefp   atan2l_ ; long double atan2l( long double y, long double x )

ifndef __386__
if _MODEL and _BIG_CODE
argx    equ     6
else
argx    equ     4
endif
endif


;  input:       x - on the stack
;  output:      arctan of x in st(0)
;
        defp    atanl_
ifdef __386__
        fld     tbyte ptr 4[ESP]; load x
        call    IF@DATAN        ; calculate atan(x)
        loadres                 ; load result
else
        push    BP              ; save BP
        mov     BP,SP           ; get access to parms
        fld     tbyte ptr argx[BP]; load argument x
        call    IF@DATAN        ; calculate atan(x)
        pop     BP              ; restore BP
endif
        ret_pop _POP_LD_        ; return
        endproc atanl_

        defp    atan2l_
ifdef __386__
        fld     tbyte ptr 4+12[ESP]; load x
        fld     tbyte ptr 4[ESP]; load y
        call    IF@DATAN2       ; calculate atan2(y,x)
        loadres                 ; load result
else
        push    BP              ; save BP
        mov     BP,SP           ; get access to stack
        fld     tbyte ptr argx+10[BP]; load x
        fld     tbyte ptr argx[BP]; load y
        call    IF@DATAN2       ; calculate atan2(y,x)
        pop     BP              ; restore BP
endif
        ret_pop _POP_LD_*2      ; return
        endproc atan2l_

        endmod
        end