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mu: move mu/mu/tests, lib/tests one level up

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Makes it easier to generator code-coverage reports
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Dirk-Jan C. Binnema
2020-01-01 15:41:49 +02:00
parent 0f98fbec2d
commit 80c5e25b08
125 changed files with 325 additions and 768 deletions
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lib/tests/testdir/new/1220863087.12663_9.mindcrime
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Thread-Topic: [sqlite-dev] VM optimization inside sqlite3VdbeExec
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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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Actually, almost every C compiler will already do what you suggest: if =
the range of case labels is compact, the switch will be compiled using a =
jump table. Only if the range is limited and/or sparse other techniques =
will be used, such as linear search and binary search.
=20
I'm pretty sure, if you perform the tests suggested by Mihai, that you =
will find zero performance difference, neither better, nor worse.
=20
Paul
=20
________________________________
From: anon@example.com
Sent: Mon 8/4/2008 11:40 AM
To: sqlite-dev@sqlite.org
Subject: [sqlite-dev] VM optimization inside sqlite3VdbeExec
Inside sqlite3VdbeExec there is a very big switch statement.
In order to increase performance with few modifications to the=20
original code, why not use this technique ?
http://docs.freebsd.org/info/gcc/gcc.info.Labels_as_Values.html =
<http://docs.freebsd.org/info/gcc/gcc.info.Labels_as_Values.html>=20
With a properly defined "instructions" array, instead of the switch=20
statement you can use something like:
goto * instructions[pOp->opcode];
---
Marco Bambini
http://www.sqlabs.net <http://www.sqlabs.net/>=20
http://www.sqlabs.net/blog/ <http://www.sqlabs.net/blog/>=20
http://www.sqlabs.net/realsqlserver/ =
<http://www.sqlabs.net/realsqlserver/>=20
_______________________________________________
sqlite-dev mailing list
sqlite-dev@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-dev =
<http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-dev>=20
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<HTML dir=3Dltr><HEAD><TITLE>[sqlite-dev] VM optimization inside =
sqlite3VdbeExec</TITLE>=0A=
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dunicode">=0A=
<META content=3D"MSHTML 6.00.2715.400" name=3DGENERATOR></HEAD>=0A=
<BODY>=0A=
<DIV id=3DidOWAReplyText54900 dir=3Dltr>=0A=
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 size=3D2>Actually, =
almost every C compiler will already do what you suggest: if the range =
of case labels is compact, the switch will be compiled using a jump =
table. Only if the range is limited and/or sparse other techniques will =
be used, such as linear search and binary search.</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>I'm pretty sure, if you =
perform the tests suggested by Mihai, that you will find zero =
performance difference, neither better, nor worse.</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Paul</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>=0A=
<HR tabIndex=3D-1>=0A=
</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial><FONT size=3D2><B>From:</B> =
sqlite-dev-bounces@sqlite.org on behalf of Marco Bambini<BR><B>Sent:</B> =
Mon 8/4/2008 11:40 AM<BR><B>To:</B> =
sqlite-dev@sqlite.org<BR><B>Subject:</B> [sqlite-dev] VM optimization =
inside sqlite3VdbeExec<BR><BR></FONT></FONT></DIV></DIV>=0A=
<DIV>=0A=
<P><FONT face=3DArial size=3D2>Inside sqlite3VdbeExec there is a very =
big switch statement.<BR>In order to increase performance with few =
modifications to the&nbsp;<BR>original code, why not use this technique =
?<BR></FONT><A =
href=3D"http://docs.freebsd.org/info/gcc/gcc.info.Labels_as_Values.html">=
<FONT face=3DArial =
size=3D2>http://docs.freebsd.org/info/gcc/gcc.info.Labels_as_Values.html<=
/FONT></A><BR><BR><FONT face=3DArial size=3D2>With a properly defined =
"instructions" array, instead of the switch&nbsp;<BR>statement you can =
use something like:<BR>goto * =
instructions[pOp-&gt;opcode];<BR>---<BR>Marco Bambini<BR></FONT><A =
href=3D"http://www.sqlabs.net/"><FONT face=3DArial =
size=3D2>http://www.sqlabs.net</FONT></A><BR><A =
href=3D"http://www.sqlabs.net/blog/"><FONT face=3DArial =
size=3D2>http://www.sqlabs.net/blog/</FONT></A><BR><A =
href=3D"http://www.sqlabs.net/realsqlserver/"><FONT face=3DArial =
size=3D2>http://www.sqlabs.net/realsqlserver/</FONT></A><BR><BR><BR><BR><=
FONT face=3DArial =
size=3D2>_______________________________________________<BR>sqlite-dev =
mailing list<BR>sqlite-dev@sqlite.org<BR></FONT><A =
href=3D"http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-dev"><FONT=
face=3DArial =
size=3D2>http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-dev</FONT=
></A><BR></P></DIV></BODY></HTML>
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