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Invert the meaning of the regBignull flag so that it is 1 when doing the

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normal scan and 1 when scanning nulls.  This enables the re-do jump at the
bottom of the loop to be coded with a single OP_IfNotZero opcode, rather
than a sequence of OP_If, OP_Integer, OP_Goto.

FossilOrigin-Name: bf875e1a259a4167694e06349458452dc36c1d38aa6843518d9ae46ce74e5559
This commit is contained in:
drh
2019-08-23 13:32:03 +00:00
parent 74e1b861ad
commit ec3dda5b11
5 changed files with 17 additions and 23 deletions
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2
src/whereInt.h
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@@ -71,7 +71,7 @@ struct WhereLevel {
int addrCont; /* Jump here to continue with the next loop cycle */
int addrFirst; /* First instruction of interior of the loop */
int addrBody; /* Beginning of the body of this loop */
int regBignull; /* big-null flag reg. True if NULLs not yet scanned */
int regBignull; /* big-null flag reg. True if a NULL-scan is needed */
int addrBignull; /* Jump here for next part of big-null scan */
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
u32 iLikeRepCntr; /* LIKE range processing counter register (times 2) */