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Factor constant subexpressions out of loops. (CVS 4942)

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FossilOrigin-Name: 2126db39854c751aea6c95c67894ed9b9dfc0763
This commit is contained in:
drh
2008-03-31 18:19:54 +00:00
parent a686bfcfa5
commit 678ccce8b3
6 changed files with 92 additions and 42 deletions
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23
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.681 2008/03/26 12:46:24 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.682 2008/03/31 18:19:54 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -1130,15 +1130,16 @@ struct Expr {
/*
** The following are the meanings of bits in the Expr.flags field.
*/
#define EP_FromJoin 0x01 /* Originated in ON or USING clause of a join */
#define EP_Agg 0x02 /* Contains one or more aggregate functions */
#define EP_Resolved 0x04 /* IDs have been resolved to COLUMNs */
#define EP_Error 0x08 /* Expression contains one or more errors */
#define EP_Distinct 0x10 /* Aggregate function with DISTINCT keyword */
#define EP_VarSelect 0x20 /* pSelect is correlated, not constant */
#define EP_Dequoted 0x40 /* True if the string has been dequoted */
#define EP_InfixFunc 0x80 /* True for an infix function: LIKE, GLOB, etc */
#define EP_ExpCollate 0x100 /* Collating sequence specified explicitly */
#define EP_FromJoin 0x0001 /* Originated in ON or USING clause of a join */
#define EP_Agg 0x0002 /* Contains one or more aggregate functions */
#define EP_Resolved 0x0004 /* IDs have been resolved to COLUMNs */
#define EP_Error 0x0008 /* Expression contains one or more errors */
#define EP_Distinct 0x0010 /* Aggregate function with DISTINCT keyword */
#define EP_VarSelect 0x0020 /* pSelect is correlated, not constant */
#define EP_Dequoted 0x0040 /* True if the string has been dequoted */
#define EP_InfixFunc 0x0080 /* True for an infix function: LIKE, GLOB, etc */
#define EP_ExpCollate 0x0100 /* Collating sequence specified explicitly */
#define EP_Constant 0x0200 /* A constant expression */
/*
** These macros can be used to test, set, or clear bits in the
@@ -1831,7 +1832,9 @@ void sqlite3WhereEnd(WhereInfo*);
void sqlite3ExprCodeGetColumn(Vdbe*, Table*, int, int, int);
int sqlite3ExprCode(Parse*, Expr*, int);
int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
int sqlite3ExprCodeTarget(Parse*, Expr*, int);
int sqlite3ExprCodeAndCache(Parse*, Expr*, int);
void sqlite3ExprCodeConstants(Parse*, Expr*);
int sqlite3ExprCodeExprList(Parse*, ExprList*, int);
void sqlite3ExprIfTrue(Parse*, Expr*, int, int);
void sqlite3ExprIfFalse(Parse*, Expr*, int, int);