First, this isn't an urgent problem which I need help with IMMEDIATELY. I've already worked around it, so suggestions on how to work around it would be pointless, but I'm thinking it might be a bug in DMC, so I'm posting about it. Or I might be using the wrong compiler-options, so I'm including my compile-line and .def file in this post.

I'm wondering why DMC is complaining about this bit of asm:

DMC said:
>                fmul st(0), st(0)
>                                ^
> noctis-0.cpp(2923) : Error: Illegal type/size of operands for the fmul instruction

(That's exact line is used in two places, DMC complained about both)

It also complains about fmulp st(1), st(0) - I had thought it just didn't like
multiplying st(0) times st(0), so did fld st(0) followed by fmulp st(1), st(0),
and it complains. However, it doesn't complain about 'fmulp' with no args -
which according to Intel's IA-32 Instruction Set Reference manual, is just a
short way to write fmulp st(1), st(0):

From said manual:
Opcode    Instruction         Description
-----------------------------------------
D8 C8+i   FMUL ST(0), ST(i)   Multiply ST(0) by ST(i) and store result in ST(0)
DC C8+i   FMUL ST(i), ST(0)   Multiply ST(i) by ST(0) and store result in ST(0)
DE C8+i   FMULP ST(i), ST(0)  Multiply ST(i) by ST(0), store result in ST(i),
and pop the register stack
DE C9     FMULP               Multiply ST(i) by ST(0), store result in ST(i),
and pop the register stack

P.S. Compile lines:
dmc.exe noctis.cpp noctis-0.cpp noctis-1.cpp noctis.def -oNoctis_D -mld -gp -s
-Ju -L/co/ma -g -cpp | more
dmc.exe noctis.cpp noctis-0.cpp noctis-1.cpp noctis.def -oNoctis -gp -s -Ju -mld
-cpp | more

Def file:
EXETYPE DOS
REALMODE


(For anyone curious, Noctis is a free game, the source is posted on the site for it, but it was made with BC 3.1, a really old DOS compiler. I'm fiddling to see if I can get it compiling with DM.)

-SL

I wish we could edit what we posted. Guess I should re-read my message(s) BEFORE posting them here. :P

Corrections:

>(That's exact line is used in two places, DMC complained about both)
I meant to say: (That exact line is used in two places, DMC complained about
both)

>DE C9     FMULP               Multiply ST(i) by ST(0), store result in ST(i),
>and pop the register stack
Should say ST(1), not ST(i).

The rest is correct.

-SL

Huh. I attempted to post corrections once already, but the post seems to have vanished into the clear blue sky.

Let's try again...

>(That's exact line is used in two places, DMC complained about both)
The "'s" wasn't supposed to be there.

>DE C9     FMULP               Multiply ST(i) by ST(0), store result in ST(i),
ST(i) in both places in that line should be ST(1).

The rest looks correct.

-SL

    FMUL st, st(0)

should work.

"SL" <SL_member@pathlink.com> wrote in message news:c1kvdv$a3p$1@digitaldaemon.com...
> First, this isn't an urgent problem which I need help with IMMEDIATELY.
I've
> already worked around it, so suggestions on how to work around it would be pointless, but I'm thinking it might be a bug in DMC, so I'm posting about
it.
> Or I might be using the wrong compiler-options, so I'm including my
compile-line
> and .def file in this post.
>
> I'm wondering why DMC is complaining about this bit of asm:
>
> DMC said:
> >                fmul st(0), st(0)
> >                                ^
> > noctis-0.cpp(2923) : Error: Illegal type/size of operands for the fmul
instruction
>
> (That's exact line is used in two places, DMC complained about both)
>
> It also complains about fmulp st(1), st(0) - I had thought it just didn't
like
> multiplying st(0) times st(0), so did fld st(0) followed by fmulp st(1),
st(0),
> and it complains. However, it doesn't complain about 'fmulp' with no
args -
> which according to Intel's IA-32 Instruction Set Reference manual, is just
a
> short way to write fmulp st(1), st(0):
>
> From said manual:
> Opcode    Instruction         Description
> -----------------------------------------
> D8 C8+i   FMUL ST(0), ST(i)   Multiply ST(0) by ST(i) and store result in
ST(0)
> DC C8+i   FMUL ST(i), ST(0)   Multiply ST(i) by ST(0) and store result in
ST(0)
> DE C8+i   FMULP ST(i), ST(0)  Multiply ST(i) by ST(0), store result in
ST(i),
> and pop the register stack
> DE C9     FMULP               Multiply ST(i) by ST(0), store result in
ST(i),
> and pop the register stack
>
> P.S. Compile lines:
> dmc.exe noctis.cpp noctis-0.cpp noctis-1.cpp
noctis.def -oNoctis_D -mld -gp -s
> -Ju -L/co/ma -g -cpp | more
> dmc.exe noctis.cpp noctis-0.cpp noctis-1.cpp
noctis.def -oNoctis -gp -s -Ju -mld
> -cpp | more
>
> Def file:
> EXETYPE DOS
> REALMODE
>
>
> (For anyone curious, Noctis is a free game, the source is posted on the
site for
> it, but it was made with BC 3.1, a really old DOS compiler. I'm fiddling
to see
> if I can get it compiling with DM.)
>
> -SL
>
>