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Overview
| Comment: | Optimization to the out2Prerelease() helper routine in the VDBE engine. |
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| Timelines: | family | ancestors | descendants | both | trunk |
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| SHA1: |
79298fe8c42f64b6a6110a70b8403387 |
| User & Date: | drh 2015-10-15 17:31:41 |
Context
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2015-10-15
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| 18:04 | Add the OP_IntCopy opcode - an optimized version of OP_SCopy that only works for integer values. check-in: 3a2f73a4 user: drh tags: trunk | |
| 17:31 | Optimization to the out2Prerelease() helper routine in the VDBE engine. check-in: 79298fe8 user: drh tags: trunk | |
| 17:21 | Remove a superfluous conditional from the memory allocation initialization. check-in: 9ccf8f8d user: drh tags: trunk | |
Changes
Changes to src/vdbe.c.
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return 1; } #endif /* ** Return the register of pOp->p2 after first preparing it to be ** overwritten with an integer value. */ static Mem *out2Prerelease(Vdbe *p, VdbeOp *pOp){ Mem *pOut; assert( pOp->p2>0 ); assert( pOp->p2<=(p->nMem-p->nCursor) ); pOut = &p->aMem[pOp->p2]; memAboutToChange(p, pOut); if( VdbeMemDynamic(pOut) ) sqlite3VdbeMemSetNull(pOut); pOut->flags = MEM_Int; return pOut; } /* ** Execute as much of a VDBE program as we can. ** This is the core of sqlite3_step(). */ |
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return 1; } #endif /* ** Return the register of pOp->p2 after first preparing it to be ** overwritten with an integer value. */ static SQLITE_NOINLINE Mem *out2PrereleaseWithClear(Mem *pOut){ sqlite3VdbeMemSetNull(pOut); pOut->flags = MEM_Int; return pOut; } static Mem *out2Prerelease(Vdbe *p, VdbeOp *pOp){ Mem *pOut; assert( pOp->p2>0 ); assert( pOp->p2<=(p->nMem-p->nCursor) ); pOut = &p->aMem[pOp->p2]; memAboutToChange(p, pOut); if( VdbeMemDynamic(pOut) ){ return out2PrereleaseWithClear(pOut); }else{ pOut->flags = MEM_Int; return pOut; } } /* ** Execute as much of a VDBE program as we can. ** This is the core of sqlite3_step(). */ |