How To Retrieve QUAD Return With INLINE?

[Clay Clear]

I have a couple of PB/DOS ASM functions that return QUAD's.
These functions are called by other functions that are also
written in inline ASM. All of them are in UNITs. According to the
users manual, QUAD functions return their results in the FPU stack.
PB/DOS 3.5 ASM does not have FPU support (at least, that's what it
appears after TRYING to compile with inline FPU code). So, how
can the calling funcitons, using ASM, retrieve the return results
of these QUAD functions?

Any help VERY gratefully received.


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[Paul Dixon]

Clay,
without having tested this..

I think you need to move the address of the target variable into SI (or another suitable register) and then use !DB to assemble the istruction to pop the FPU into the QWORD pointed to by SI
e.g.

!mov SI, PointerToTargetQUAD
!DB &hDD    ;FSTP..
!DB &h1C    ;     ..QWORD [SI]

Paul

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[Clay Clear]

Ahhhh, shucks, Paul, I guess I'm so tired that I never even
thought of byte tweaking. And here I've done it enough times before.
Thank you very much.


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[Clay Clear]

OK, here's a working example, for those who might need to know how to
do it. Thanks goes to Paul for the inspiration.

I am not going to spell out what everything means. The important
stuff has been annotated, everything else is my coding, and is not
relevant.

$INCLUDE "pbu.inc"

FUNCTION Test (BYVAL S AS STRING) PUBLIC AS QUAD
    DIM Q AS LOCAL QUAD
    $INCLUDE "push.bas"
    ! mov ax, S
    ! push ax
    ! call Siz
    ! push ss      'these lines are the important ones
    ! pop es       '-----
    ! lea di, Q    '-----
    ! db &HDF      '-----
    ! db &H3D      '-----
    $INCLUDE "pop.bas"
    FUNCTION = Q
END FUNCTION

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