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optimizations. Because it is relatively low-level, RTL is not as good as one would like in terms of supporting higher-level optimizations related to data types, array and variable references, and overall data and control flow within your code. With GCC 4.0, the fine makers of the GCC compilers introduced a new intermediate form, static single assignment (SSA), which operates on the parse trees that are produced from your code by GCC compilers, and is thus known as Tree SSA. Without clubbing you to death with algorithms, it is interesting to note that 4.0 and later GCC compilers use two intermediate forms before arriving at a Tree SSA representation, known as GENERIC and GIMPLE. A GENERIC representation is produced by eliminating language-specific constructs from the parse tree that is generated from your code, and a GIMPLE representation is then produced from the GENERIC representation by simplifying address references within the code. Even semantically, you can see that introducing these two intermediate forms and the Tree SSA representation provides several additional points at which optimizations can occur at as high a level as possible before zooming into the depths of the RTL representation of your code. The best source of information on Tree SSA and the actual steps of the optimization process can be found in various papers and presentations by its authors. One particularly interesting presentation was made at the 2003 GCC Developers Summit, and is part of the proceedings for that conference. You can find these online at http://www.linux.org.uk/~ajh/gcc/gccsummit-2003-proceedings.pdf.

Finally, you can have the annotation text come from a file if you don t want to specify the text on the command line. To do this, instead of the annotation text in the command line, use an at sign and then the name of the file containing the annotation text. For example: convert -annotate 0x0+10+30 @textfile.txt input.jpg output.jpg

(3 row(s) affected)

The most significant changes to GCC optimization in the GCC 4.x family are related to the introduction of the intermediate Tree SSA format discussed in the previous section. This has provided many new opportunities for optimization and therefore introduced many new options, including -ftree-ccp, -ftree-ch, -ftree-copyrename, -ftree-dce, -ftree-dominator-opts, -ftree-dse, -ftree-fre, -ftree-loop-im, -ftree-loop-ivcanon, -ftree-loop-linear, -ftree-loop-optimize, -ftree-lrs, -ftree-pre, -ftree-sra, -ftree-ter, and -ftree-vectorize, which are explained later in this chapter. Due largely to the introduction of these new options, the default optimizations that are invoked by the generic -O1, -O2, -O3, and -Os optimization levels have also changed. Another side effect of introducing the intermediate Tree SSA form is that optimization is more consistent, regardless of the input language and GCC compiler you are using. GCC 4 also introduces substantial improvements in vectorization, thanks largely to contributions from IBM. Vectorization increases the efficiency of processor operations by finding code where a single instruction can be applied to multiple data elements. GCC 4 enables up to 16 scalar operations to be mapped to a single vector operation. This optimization can be especially useful in gaming, graphics, and multimedia applications where instructions are repetitively applied to arrays of values. GCC 4 also introduces improvements in checking array boundaries and validating the contents and structure of the stack, both of which help automate protections against popular application attacks that attempt to induce buffer or stack overflows.

The example began by starting a new transaction and executing a query against the Production.ProductDocument table using a TABLOCKX locking hint (this hint places an exclusive lock on the table). In order to monitor what locks are open for the current SQL Server instance, the sys.dm_tran_locks dynamic management view was queried. It returned a list of active locks in the AdventureWorks database. The exclusive lock on the ProductDocument table could be seen in the third row of the results. Use sys.dm_tran_locks to troubleshoot unexpected concurrency issues. For example, a query session may be holding locks longer than desired, or issuing a lock resource granularity or lock mode that you hadn t expected (perhaps a table lock instead of a finer grained row or page lock). Understanding what is happening at the locking level can help you troubleshoot your queries more effectively.