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Use Knuth multiplicative hashing for the symbol table.

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FossilOrigin-Name: cc29ddd6be60bdbf107f285c9eb57d5896ebca2d
This commit is contained in:
drh 2016-09-28 20:42:31 +00:00
parent 5e769a50ad
commit 5f33eaa6a4
3 changed files with 12 additions and 8 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Two\smore\stypo\sfixes\sin\scomments.
D 2016-09-28T16:05:53.347
C Use\sKnuth\smultiplicative\shashing\sfor\sthe\ssymbol\stable.
D 2016-09-28T20:42:31.903
F Makefile.in 6fd48ffcf7c2deea7499062d1f3747f986c19678
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 5151cc64c4c05f3455f4f692ad11410a810d937f
@ -344,7 +344,7 @@ F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
F src/fkey.c b9ca262f6ad4d030a3cab737ebf9b0b3c8b4ac80
F src/func.c 29cc9acb170ec1387b9f63eb52cd85f8de96c771
F src/global.c 2917bbc488201b791e5f5dd43d8d2a3ccc315da7
F src/hash.c 55b5fb474100cee0b901edaf203e26c970940f36
F src/hash.c 63d0ee752a3b92d4695b2b1f5259c4621b2cfebd
F src/hash.h ab34c5c54a9e9de2e790b24349ba5aab3dbb4fd4
F src/hwtime.h 747c1bbe9df21a92e9c50f3bbec1de841dc5e5da
F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
@ -1525,7 +1525,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 5bbd071d57a8048e2ca17bf97761e4f27fc5a6bf
R bf0761c46088be2deeef7ae66a06e596
P 40c0fb0af678797c39a99853f9f4102464c16f4b
R 781c8f4e56859d80db856b6e4a37be8a
U drh
Z f28f9e255c7712d05cf98e2e813edaa6
Z f77949e5354e55e63daf682f77676620

2
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@ -1 +1 @@
40c0fb0af678797c39a99853f9f4102464c16f4b
cc29ddd6be60bdbf107f285c9eb57d5896ebca2d

6
src/hash.c
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@ -56,7 +56,11 @@ static unsigned int strHash(const char *z){
unsigned int h = 0;
unsigned char c;
while( (c = (unsigned char)*z++)!=0 ){ /*OPTIMIZATION-IF-TRUE*/
h = (h<<3) ^ h ^ sqlite3UpperToLower[c];
/* Knuth multiplicative hashing. (Sorting & Searching, p. 510).
** 0x9e3779b1 is 2654435761 which is the closest prime number to
** (2**32)*golden_ratio, where golden_ratio = (sqrt(5) - 1)/2. */
h += sqlite3UpperToLower[c];
h *= 0x9e3779b1;
}
return h;
}