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Performs dead code elimination (DCE) on SSA trees (GCC 4.x only). Performs a variety of optimizations using a dominator tree traversal. A dominator tree is a tree where each node s children are the nodes that it immediately dominates. These cleanups include constant/copy propagation, redundancy elimination, range propagation, expression simplification, and jump threading (reducing jumps to other jumps) (GCC 4.x only). Performs dead store elimination (DSE) on SSA trees (GCC 4.x only). Performs full redundancy elimination (FRE) on SSA trees, which only considers expressions that are computed on full paths leading to the redundant compilation. This is similar to and faster than a full partial redundancy elimination (PRE) pass, but discovers fewer redundancies than PRE (GCC 4.x only). Performs live range splitting when converting SSA trees back to normal form prior to RTL generation. This creates unique variables in distinct live ranges where a variable is used, providing subsequent opportunities for optimization (GCC 4.x only). Performs scalar replacement of aggregates, which replaces structure references with scalar values to avoid committing structures to memory earlier than necessary (GCC 4.x only). Performs temporary expression replacement (TER) when converting SSA trees back to normal form prior to RTL generation. This replaces single-use temporary expressions with the expressions that defined them, making it easier to generate RTL code and provide opportunities for better subsequent optimization in the RTL code (GCC 4.x only).

In this example, a stored procedure is set to execute automatically whenever SQL Server is started. First, the database context is set to the master database (which is the only place that auto-executable stored procedures can be placed): USE MASTER GO Next, for the example, a startup logging table is created: CREATE TABLE dbo.SQLStartupLog (SQLStartupLogID int IDENTITY(1,1) NOT NULL PRIMARY KEY, StartupDateTime datetime NOT NULL) GO Now, a new stored procedure is created to insert a value into the new table (so you can see whenever SQL Server was restarted using the table): CREATE PROCEDURE dbo.usp_INS_TrackSQLStartups AS INSERT dbo.SQLStartupLog (StartupDateTime) VALUES (GETDATE()) GO Next, the sp_procoption stored procedure is used to set this new procedure to execute when the SQL Server service restarts: EXEC sp_procoption @ProcName = 'usp_INS_TrackSQLStartups', @OptionName = 'startup', @OptionValue = 'true' Once the service restarts, a new row is inserted into the table. To disable the stored procedure again, the following command would need to be executed: EXEC sp_procoption @ProcName = 'usp_INS_TrackSQLStartups', @OptionName = 'startup', @OptionValue = off

Level 1 optimizations comprise a reasonable set of optimizations that include both size reduction and speed enhancement. For example, -tree-dce eliminates dead code in applications compiled with GCC 4, thereby reducing the overall code size. Fewer jump instructions mean that a program s overall stack consumption is smaller. -fcprop-registers, on the other hand, is a performance optimization that works by minimizing the number of times register values are copied around, saving the overhead associated with register copies. -fdelayed-branch and -fguess-branch-probability are instruction scheduler enhancements. If the underlying CPU supports instruction scheduling, these optimization flags attempt to utilize the instruction scheduler to minimize CPU delays while the CPU waits for the next instruction. The loop optimizations applied when you specify -floop-optimize include moving constant expressions above loops and simplifying test conditions for exiting loops. At level 2 and higher optimization levels, this flag also performs strength reduction and unrolls loops. -fomit-frame-pointer is a valuable and popular optimization for two reasons: it avoids the instructions required to set up, save, and restore frame pointers and, in some cases, makes an additional CPU register available for other uses. On the downside, in the absence of frame pointers, debugging (such as generating stack traces, especially from deeply nested functions) can be difficult if not impossible.

In this recipe, a new table was created in the master database that tracks SQL Server start-ups. A stored procedure is also created in the master database to insert a row into the table with the current date and time of execution.

Interestingly, the point shape is drawn with the current fill color, not the current stroke color, which is something to note when you re using that shape. Setting the stroke width also has no effect on the image drawn.

Caution I m not espousing the creation of objects in the system databases. It isn t generally a good idea. Although if you must use auto-execution functionality as discussed in this recipe, you have no choice but to do it (for example, if your IT department requires a log of SQL Server service start times for tracking purposes).

-O2 optimization (level 2 optimization) includes all level 1 optimizations plus the additional optimizations listed in Table 5-2. Applying these optimizations will lengthen the compile time, but as a result you should also see a measurable increase in the resulting code s performance, or, rather, a measurable decrease in execution time.

Next, sp_procoption was called to set the startup value of the stored procedure: EXEC sp_procoption @ProcName = 'usp_INS_TrackSQLStartups', @OptionName = 'startup', @OptionValue = 'true' After sp_procoption was used, whenever the SQL Server service is restarted, a new row will be inserted into the dbo.SQLStartupLog table.

The optimizations listed in Table 5-2 are enabled by default when you specify the O2 optimization option.