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Avoid unnecessary memory zeroing during expression list allocation. 

FossilOrigin-Name: de28e6514a42438411e2c9d833ba660108128ca86d0b90f32925fb73195f4862
This commit is contained in:
drh 2017-05-31 02:58:30 +00:00
parent d03257c141
commit a8b9793c86
4 changed files with 12 additions and 10 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Size\sand\sperformance\soptimizations\sto\ssqlite3ResolveExprNames().
D 2017-05-31T00:49:40.197
C Avoid\sunnecessary\smemory\szeroing\sduring\sexpression\slist\sallocation.
D 2017-05-31T02:58:30.131
F Makefile.in 1cc758ce3374a32425e4d130c2fe7b026b20de5b8843243de75f087c0a2661fb
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 8eeb80162074004e906b53d7340a12a14c471a83743aab975947e95ce061efcc
@ -357,7 +357,7 @@ F src/ctime.c 47d91a25ad8f199a71a5b1b7b169d6dd0d6e98c5719eca801568798743d1161c
F src/date.c cc42a41c7422389860d40419a5e3bce5eaf6e7835c3ba2677751dc653550a5c7
F src/dbstat.c 19ee7a4e89979d4df8e44cfac7a8f905ec89b77d
F src/delete.c bc2bfc227002ebe091e7cc321f09a48e52f86e1cd5ff9b028009db0671556749
F src/expr.c 82ccc704a2e5aa114f2a2c67610b87963add6d65336f352bb1782a2942356bcb
F src/expr.c 452c6f3aa656aabf3eefe96bb5f316b2c987fbc12c647964e4ed880f193ca31f
F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
F src/fkey.c db65492ae549c3b548c9ef1f279ce1684f1c473b116e1c56a90878cd5dcf968d
F src/func.c 9d52522cc8ae7f5cdadfe14594262f1618bc1f86083c4cd6da861b4cf5af6174
@ -409,7 +409,7 @@ F src/shell.c 3f761fe604174b31aacd2ea2eacef5e6fe550111d60c0d71532cc008c68cf3f3
F src/sqlite.h.in 8dd468837a4f6d76713e3a4cc65bea48095009038593d41040ab46c1b351197f
F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
F src/sqlite3ext.h 58fd0676d3111d02e62e5a35992a7d3da5d3f88753acc174f2d37b774fbbdd28
F src/sqliteInt.h 4faf6f2542949b61fd0aa69233dd23ad3469656c24085e874dbfa2e0cc03b901
F src/sqliteInt.h 82800fc19fbdeb35a0773c5d727da717652f4c421d191d2460219c7aab953462
F src/sqliteLimit.h 1513bfb7b20378aa0041e7022d04acb73525de35b80b252f1b83fedb4de6a76b
F src/status.c a9e66593dfb28a9e746cba7153f84d49c1ddc4b1
F src/table.c b46ad567748f24a326d9de40e5b9659f96ffff34
@ -1581,7 +1581,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P e972a3860892022d57b26ec44ce0fbadc61c1ff54b7a10b7e82390db88d323a7
R 834d3387387da9d103b939ffc6cd81e1
P af8c0fed93c830c50641d95691bb507c31947a15529aba2a88bfaa66b3a3287a
R 01bf3eaa562713fce9de46b8681a7f8f
U drh
Z d53818aaf774b30faf87723ebcc57f14
Z 430fbbd11694ab4293403e0492d5010e

2
manifest.uuid
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@ -1 +1 @@
af8c0fed93c830c50641d95691bb507c31947a15529aba2a88bfaa66b3a3287a
de28e6514a42438411e2c9d833ba660108128ca86d0b90f32925fb73195f4862

4
src/expr.c
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@ -1488,7 +1488,9 @@ ExprList *sqlite3ExprListAppend(
pList->nAlloc *= 2;
}
pItem = &pList->a[pList->nExpr++];
memset(pItem, 0, sizeof(*pItem));
assert( offsetof(struct ExprList_item,zName)==sizeof(pItem->pExpr) );
assert( offsetof(struct ExprList_item,pExpr)==0 );
memset(&pItem->zName,0,sizeof(*pItem)-offsetof(struct ExprList_item,zName));
pItem->pExpr = pExpr;
return pList;

2
src/sqliteInt.h
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@ -2831,10 +2831,10 @@ struct Select {
*/
struct SelectDest {
u8 eDest; /* How to dispose of the results. On of SRT_* above. */
char *zAffSdst; /* Affinity used when eDest==SRT_Set */
int iSDParm; /* A parameter used by the eDest disposal method */
int iSdst; /* Base register where results are written */
int nSdst; /* Number of registers allocated */
char *zAffSdst; /* Affinity used when eDest==SRT_Set */
ExprList *pOrderBy; /* Key columns for SRT_Queue and SRT_DistQueue */
};