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The hack embodied in commit 4ba61a487 no longer works after today's change to allow DatumGetFloat4/Float4GetDatum to be inlined (commit 14cca1bf8). Probably what's happening is that the faulty compilers are deciding that the now-inlined assignment is a no-op and so they're not required to round to float4 width. We had a bunch of similar issues earlier this year in the degree-based trig functions, and eventually settled on using volatile intermediate variables as the least ugly method of forcing recalcitrant compilers to do what the C standard says (cf commit 82311bcdd). Let's see if that method works here. Discussion: <4640.1472664476@sss.pgh.pa.us>
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/.