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The integer overflow situation in div_var_fast() is a great deal more complicated than the pre-existing comments would suggest. Moreover, the comments were also flat out incorrect as to the precise statement of the maxdiv loop invariant. Upon clarifying that, it becomes apparent that the way in which we updated maxdiv after a carry propagation pass was overly slow, complex, and conservative: we can just reset it to one, which is much easier and also reduces the number of times carry propagation occurs. Fix that and improve the relevant comments. Since this is mostly a comment fix, with only a rather marginal performance boost, no need for back-patch. Tom Lane and Dean Rasheed
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.