7d9a4737c2
Set the "rscales" for intermediate-result calculations to ensure that suitable numbers of significant digits are maintained throughout. The previous coding hadn't thought this through in any detail, and as a result could deliver results with many inaccurate digits, or in the worst cases even fail with divide-by-zero errors as a result of losing all nonzero digits of intermediate results. In exp_var(), get rid entirely of the logic that separated the calculation into integer and fractional parts: that was neither accurate nor particularly fast. The existing range-reduction method of dividing by 2^n can be applied across the full input range instead of only 0..1, as long as we are careful to set an appropriate rscale for each step. Also fix the logic in mul_var() for shortening the calculation when the caller asks for fewer output digits than an exact calculation would require. This bug doesn't affect simple multiplications since that code path asks for an exact result, but it does contribute to accuracy issues in the transcendental math functions. In passing, improve performance of mul_var() a bit by forcing the shorter input to be on the left, thus reducing the number of iterations of the outer loop and probably also reducing the number of carry-propagation steps needed. This is arguably a bug fix, but in view of the lack of field complaints, it does not seem worth the risk of back-patching. Dean Rasheed |
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README
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/.