From: drh <>
Date: Mon, 28 Feb 2022 12:16:51 +0000 (+0000)
Subject: Performance optimization in initMemArray() saves about 750K cycles with only
X-Git-Tag: version-3.39.0~360
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0150c81cd38eb72b282d86cff83c5690d6d5881b;p=thirdparty%2Fsqlite.git

Performance optimization in initMemArray() saves about 750K cycles with only
a 4-byte increase in code size.

FossilOrigin-Name: c3e9cd5e7430be0653a96a2097a695447549980e08cc8bd8d8097a50c954908e
---

0150c81cd38eb72b282d86cff83c5690d6d5881b
diff --cc manifest
index f855faf0cf,a4673e8d7e..280478ad3f
--- a/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Avoid\sunnecessary\sdeinitialization\sof\sthe\sMem.flags\sfield.
- D 2022-02-28T02:35:48.040
 -C The\sperformance\sincrease\sin\sthe\sprevious\scheck-in\sof\sthis\sbranch\swas\sdue\sto\nthe\srevised\sloop\sin\sinitMemArray()\sand\sreordering\sfields\sof\sMem\s-\snot\sthe\ncall\sthe\smemcpy().\s\sChanging\sthe\scode\sto\savoid\smemcpy()\sresults\sin\san\seven\nbetter\sgain,\sand\scode\sthat\sis\sfar\sless\sdodgy.
 -D 2022-02-28T12:08:09.462
++C Performance\soptimization\sin\sinitMemArray()\ssaves\sabout\s750K\scycles\swith\sonly\na\s4-byte\sincrease\sin\scode\ssize.
++D 2022-02-28T12:16:51.464
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1944,8 -1944,8 +1944,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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+ R 0cbe8ba68087a6c2d38d406f08a0fa0f
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  U drh
- Z 9485415c0ffb00de37ffcb9d694e10b9
 -Z d7015a158f91cecfa6d5c894c1220cae
++Z 9bc2a643cc2decfa66e7a766c34e11ae
  # Remove this line to create a well-formed Fossil manifest.
diff --cc manifest.uuid
index 0689e20b8f,7529ec2db4..26a86980c5
--- a/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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++c3e9cd5e7430be0653a96a2097a695447549980e08cc8bd8d8097a50c954908e