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c++ - Lame

reply "Andrew Logan" <andrew.logan home.com> writes:
I'm not knowledgeable about programming, but I managed to modify the
makefile for MSVC to work with Digital Mars and compile the MP3 encoder,
LAME.

http://www.mp3dev.org/mp3/

I tried every listed optimization switch with the DM compiler and the
following results were obtained in converting a test WAV file:

lame - downloaded version - 15 seconds (compiler Unknown, but I think MS VC
5.0)
lame - MS Visual C 6.0       - 16 seconds
lame - DM 8.25                   - 25 seconds
lame - Borland Free            - 34 seconds

As speed when encoding, (especially using the DLL) is quite important. I am
hoping someone can enlighten me as to how I can get Digital Mars to make
faster code. I have tried:

CC_OPTS    = -Nc -Jm -o /DNDEBUG

plus I tried all the various options for the optimiser and the 25 seconds is
the fastest I can get.

Would the code run faster if comiled as DOSX? (I haven't been able to do
this yet). Is there some flag I can set? Is it because the application is a
Windows program?

(Note: I am also linking in the NASM assembler routines in both DM and VC).
Dec 16 2001
parent "Walter" <walter digitalmars.com> writes:
Try -ff (fast floating point). You also might consider -gt to turn on
profiling. This should point you to which routine is consuming all the time.


"Andrew Logan" <andrew.logan home.com> wrote in message
news:9vjnrd$2utf$1 digitaldaemon.com...
 I'm not knowledgeable about programming, but I managed to modify the
 makefile for MSVC to work with Digital Mars and compile the MP3 encoder,
 LAME.

 http://www.mp3dev.org/mp3/

 I tried every listed optimization switch with the DM compiler and the
 following results were obtained in converting a test WAV file:

 lame - downloaded version - 15 seconds (compiler Unknown, but I think MS

 5.0)
 lame - MS Visual C 6.0       - 16 seconds
 lame - DM 8.25                   - 25 seconds
 lame - Borland Free            - 34 seconds

 As speed when encoding, (especially using the DLL) is quite important. I

 hoping someone can enlighten me as to how I can get Digital Mars to make
 faster code. I have tried:

 CC_OPTS    = -Nc -Jm -o /DNDEBUG

 plus I tried all the various options for the optimiser and the 25 seconds

 the fastest I can get.

 Would the code run faster if comiled as DOSX? (I haven't been able to do
 this yet). Is there some flag I can set? Is it because the application is

 Windows program?

 (Note: I am also linking in the NASM assembler routines in both DM and


Dec 17 2001