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Slightly smaller and faster sqlite3VdbeMemSetStr().

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FossilOrigin-Name: 06928e745c7bcb26ec46a17989f30efe3536fd48a74c8a1cd423cc9ff6feccb5
This commit is contained in:
drh 2022-03-28 17:34:46 +00:00
parent 60a512d923
commit f4dd18ea36
3 changed files with 18 additions and 9 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Performance\sincrease\sin\sthe\sloop\sthat\sfrees\san\sopcode\sarray.
D 2022-03-28T15:06:36.675
C Slightly\ssmaller\sand\sfaster\ssqlite3VdbeMemSetStr().
D 2022-03-28T17:34:46.798
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -630,7 +630,7 @@ F src/vdbeInt.h 8dd91427155a38ec06e9ecbde07e33f21bc02e101625191e7613f883e379a363
F src/vdbeapi.c bc3812dff7c9e6497c87ae86962818a51f66f8d7a873e7ec02a22aa115b84799
F src/vdbeaux.c 1de06d17a1af1bf5cc776e60afcc01c49438df90863fc4db0a0516060e7b959a
F src/vdbeblob.c 5e61ce31aca17db8fb60395407457a8c1c7fb471dde405e0cd675974611dcfcd
F src/vdbemem.c 57fceb4ed6aac960e9517c963dc0668189e8b7c8e6216d257030a2f5e9a583df
F src/vdbemem.c 4fdef7b1dadb7073ea6c20f366f84cce5e01f8795317d4fd55cf2c9d6e5febf4
F src/vdbesort.c 43756031ca7430f7aec3ef904824a7883c4ede783e51f280d99b9b65c0796e35
F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1945f1d2e6be5927ec12c06d89b03ef2a4def34bf823
F src/vdbevtab.c f99b275366c5fc5e2d99f734729880994ab9500bdafde7fae3b02d562b9d323c
@ -1945,8 +1945,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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U drh
Z b8e292382fc35254c1fc18d26e049666
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# Remove this line to create a well-formed Fossil manifest.

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manifest.uuid
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@ -1 +1 @@
4ccebb86aae178dbce905d782f04d98211f8fce9aacd71c12b8694c92a4f5c40
06928e745c7bcb26ec46a17989f30efe3536fd48a74c8a1cd423cc9ff6feccb5

13
src/vdbemem.c
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@ -1107,6 +1107,13 @@ void sqlite3VdbeMemMove(Mem *pTo, Mem *pFrom){
** stored without allocating memory, then it is. If a memory allocation
** is required to store the string, then value of pMem is unchanged. In
** either case, SQLITE_TOOBIG is returned.
**
** The "enc" parameter is the text encoding for the string, or zero
** to store a blob.
**
** If n is negative, then the string consists of all bytes up to but
** excluding the first zero character. The n parameter must be
** non-negative for blobs.
*/
int sqlite3VdbeMemSetStr(
Mem *pMem, /* Memory cell to set to string value */
@ -1122,6 +1129,7 @@ int sqlite3VdbeMemSetStr(
assert( pMem!=0 );
assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
assert( !sqlite3VdbeMemIsRowSet(pMem) );
assert( enc!=0 || n>=0 );
/* If z is a NULL pointer, set pMem to contain an SQL NULL. */
if( !z ){
@ -1134,7 +1142,6 @@ int sqlite3VdbeMemSetStr(
}else{
iLimit = SQLITE_MAX_LENGTH;
}
flags = (enc==0?MEM_Blob:MEM_Str);
if( nByte<0 ){
assert( enc!=0 );
if( enc==SQLITE_UTF8 ){
@ -1142,7 +1149,9 @@ int sqlite3VdbeMemSetStr(
}else{
for(nByte=0; nByte<=iLimit && (z[nByte] | z[nByte+1]); nByte+=2){}
}
flags |= MEM_Term;
flags|= MEM_Str|MEM_Term;
}else{
flags = (enc==0?MEM_Blob:MEM_Str);
}
/* The following block sets the new values of Mem.z and Mem.xDel. It