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80c5e25b08
Makes it easier to generator code-coverage reports
139 lines
5.4 KiB
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139 lines
5.4 KiB
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Date: Mon, 04 Aug 2008 12:48:26 +0300
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To: sqlite-dev@sqlite.org
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References: <83B5AF40-DBFA-4578-A043-04C80276E195@sqlabs.net>
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Subject: Re: [sqlite-dev] VM optimization inside sqlite3VdbeExec
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Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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Marco Bambini wrote:
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> Inside sqlite3VdbeExec there is a very big switch statement.
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> In order to increase performance with few modifications to the
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> original code, why not use this technique ?
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> http://docs.freebsd.org/info/gcc/gcc.info.Labels_as_Values.html
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>
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> With a properly defined "instructions" array, instead of the switch
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> statement you can use something like:
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> goto * instructions[pOp->opcode];
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> ---
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> Marco Bambini
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> http://www.sqlabs.net
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> http://www.sqlabs.net/blog/
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> http://www.sqlabs.net/realsqlserver/
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>
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>
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>
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> _______________________________________________
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> sqlite-dev mailing list
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> sqlite-dev@sqlite.org
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> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-dev
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>
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All the world's not a VAX. This technique is GCC-specific. The SQLite
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source must be as portable as possible thus tying it to a specific
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compiler is out of the question. While one could conceivably use some
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preprocessor magic to provide alternate implementations, that would be
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impractical considering the sheer size of the code affected.
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On the other hand - perhaps you could benchmark the change and provide
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some data on whether this actually improves performance?
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fn:Mihai Limbasan
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n:Limbasan;Mihai
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org:SC SECPRAL COM SRL
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_______________________________________________
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