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Subject: Re: g++ 3.4 and -fprofile-generate

Author: Frank Phillips

Date: 12:11:13 02/16/05

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On February 16, 2005 at 14:27:49, Andrew Williams wrote:

>On February 16, 2005 at 13:09:14, Frank Phillips wrote:
>
>>Has anybody got any experience with g++ 3.4 for amd64 (x86_64) - for Linux?
>>
>>I have been using the profile generated optimisation option, but the code it
>>produces is no faster then with simple -O3.
>>
>>I simply compile with -fprofile-generate
>>then run,
>
>What do you run?

My chess program (searcher).  I have a mode for calcuating to fixed depth, which
I often use to check that the total have not changed after making changes to the
program that should not affect the tree.  Not an extensive test suite, but I
expected to see some difference.

Frank

>
>>then recompile with -fprofile-use.
>>
>>The relevant *.gcno, *.gcda files are produced.  Must be doing something
>>wrong.....
>>
>>Frank
>
>Andrew



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