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Remove unnecessary assignment operations in the btree search algorithm,

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for a small size reduction and performance increase.

FossilOrigin-Name: 01bd266eb682feed901a0995c2232b62d8444d19dbb227095dfbfe8edeaa5d88
This commit is contained in:
drh
2022-01-02 21:53:54 +00:00
parent 5d1bf4f560
commit 80d99e19b6
3 changed files with 7 additions and 9 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C In\sthe\sCLI,\sfix\s".mode\squote"\soutput\sfor\sUTF16\sBLOBs.\n[forum:/forumpost/b4bfe62fe6|Forum\spost\sb4bfe62fe6]. C Remove\sunnecessary\sassignment\soperations\sin\sthe\sbtree\ssearch\salgorithm,\nfor\sa\ssmall\ssize\sreduction\sand\sperformance\sincrease.
D 2022-01-02T20:54:33.787 D 2022-01-02T21:53:54.680
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -491,7 +491,7 @@ F src/auth.c f4fa91b6a90bbc8e0d0f738aa284551739c9543a367071f55574681e0f24f8cf
F src/backup.c 3014889fa06e20e6adfa0d07b60097eec1f6e5b06671625f476a714d2356513d F src/backup.c 3014889fa06e20e6adfa0d07b60097eec1f6e5b06671625f476a714d2356513d
F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d
F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6 F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
F src/btree.c 75aed1a53f45c9020d57ead65397693fe28e408526c08d2b15803629619eb4b7 F src/btree.c 224f59b5de2d9916452b65724ef677fb0609f8021e1ab1a068dfa8e2c9e97632
F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22 F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22
F src/btreeInt.h ee9348c4cb9077243b049edc93a82c1f32ca48baeabf2140d41362b9f9139ff7 F src/btreeInt.h ee9348c4cb9077243b049edc93a82c1f32ca48baeabf2140d41362b9f9139ff7
F src/build.c 6e16f7b539bfc55149a039bf0cda26b089640339df6147070b072df2d1c4f771 F src/build.c 6e16f7b539bfc55149a039bf0cda26b089640339df6147070b072df2d1c4f771
@@ -1936,8 +1936,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P fdf9ed665b2fb07d26f3852bfd2170f2fb56851edd2851d47672116a8ea58463 P 728e9dcc6d211acd787837c41cb62275284b5e02f55bd28bf5a44e233bcb057a
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U drh U drh
Z 3c82b93914a4204ff343c58de0981267 Z 70eaf19d957dcced1788f060f027844f
# Remove this line to create a well-formed Fossil manifest. # Remove this line to create a well-formed Fossil manifest.

2
manifest.uuid
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@@ -1 +1 @@
728e9dcc6d211acd787837c41cb62275284b5e02f55bd28bf5a44e233bcb057a 01bd266eb682feed901a0995c2232b62d8444d19dbb227095dfbfe8edeaa5d88

2
src/btree.c
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@@ -5575,7 +5575,6 @@ int sqlite3BtreeTableMoveto(
upr = pPage->nCell-1; upr = pPage->nCell-1;
assert( biasRight==0 || biasRight==1 ); assert( biasRight==0 || biasRight==1 );
idx = upr>>(1-biasRight); /* idx = biasRight ? upr : (lwr+upr)/2; */ idx = upr>>(1-biasRight); /* idx = biasRight ? upr : (lwr+upr)/2; */
pCur->ix = (u16)idx;
for(;;){ for(;;){
i64 nCellKey; i64 nCellKey;
pCell = findCellPastPtr(pPage, idx); pCell = findCellPastPtr(pPage, idx);
@@ -5717,7 +5716,6 @@ int sqlite3BtreeIndexMoveto(
lwr = 0; lwr = 0;
upr = pPage->nCell-1; upr = pPage->nCell-1;
idx = upr>>1; /* idx = (lwr+upr)/2; */ idx = upr>>1; /* idx = (lwr+upr)/2; */
pCur->ix = (u16)idx;
for(;;){ for(;;){
int nCell; /* Size of the pCell cell in bytes */ int nCell; /* Size of the pCell cell in bytes */
pCell = findCellPastPtr(pPage, idx); pCell = findCellPastPtr(pPage, idx);