Author: Bas Hamstra
Date: 02:28:33 05/08/00
Go up one level in this thread
On May 08, 2000 at 01:06:34, Landon Rabern wrote:
>On May 08, 2000 at 00:32:39, Robert Hyatt wrote:
>
>>On May 07, 2000 at 19:27:11, Landon Rabern wrote:
>>
>>>When compiling with Maximize Speed on in release mode in MSVC++ 6.0 I run at
>>>about 190,000 nps, but in DJGPP with max optimizations I can get around 330,000
>>>nps in the same position. Isn't Visual C++ supposed to be faster? Any ideas on
>>>whats going on?
>>>
>>>Thanks,
>>>
>>>Landon W. Rabern
>>
>>
>>I would suspect you are not getting all the MSVC optimizations turned on
>>correctly. It is clearly better than GCC...
>
>I did customize and put them on, but still slow. What command-line options do
>you use?
>
>Thanks,
>
>Landon
Just turn on "maximize speed", that's all. There can be rather large differences
between compilers, depending on the programs that you are compiling. But I have
personally never seen a program where VC was not fastest.
I discovered kind of the opposite from you:
VC GCC BORLAND
program 1: 350 KNPS 350 KNPS 275 KNPS
program 2: 750 KNPS 450 KNPS 600 KNPS
So in for the first prog Borland is slowest, but for the second program GNU is
slowest! For GNU: -O2 -fomitframepointer -mpentiumpro.
A possible explanation is that I do an asm LastOne in Borland/VC and not in GNU.
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