c++ - 'fmul st(0), st(0)' gives "Illegal type/size of operands for the fmul instruction" error, so does 'fmulp st(1), st(0)', but not 'fmulp', which means the same thing as 'fmulp st(1), st(0)' according to Intel's instruction set reference manual.
- SL (34/37) Feb 26 2004 First, this isn't an urgent problem which I need help with IMMEDIATELY. ...
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
Feb 26 2004
SL <SL_member pathlink.com> 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 stackShould say ST(1), not ST(i). The rest is correct. -SL
Feb 26 2004
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
Feb 26 2004
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
Feb 26 2004