Custom Query (122 matches)

Filters
 
Or
 
  
 
Columns

Show under each result:


Results (88 - 90 of 122)

Ticket Resolution Summary Owner Reporter
#66 fixed Lapack hangs in dlamc1 if in optimized build andreasw stefan
Description

Hi,

in some cases, CBC (2.1 stable) and SCIP (1.0; using Clp as LP solver) hang in the Lapack routine dlamc1 if I have compiled in optimized mode (i.e., default).

The compiler is a GCC 4.2.1, the machine a Intel Core2 Duo.

John pointed me to this ticket in the Octave mailing list. I followed the suggestions there and the problem went away when I added -ffloat-store to the FFLAGS.

Should this flag be added per default (when gcc is used), at least for dlamch.f ?

Best, Stefan

PS: This is from the gcc manual on what -ffloat-store is doing:

Do not store floating point variables in registers, and inhibit other options that might change whether a floating point value is taken from a register or memory.

This option prevents undesirable excess precision on machines such as the 68000 where the floating registers (of the 68881) keep more precision than a "double" is supposed to have. Similarly for the x86 architecture. For most programs, the excess precision does only good, but a few programs rely on the precise definition of IEEE floating point. Use -ffloat-store for such programs, after modifying them to store all pertinent intermediate computations into variables.

#82 fixed document use of MS Visual Studio files lou stefan
Description

The documentation on the MSDevStudio project page should be updated (or moved into the BuildTools? wiki and updated there).

A link under "Quick Source Download, Build, and Installation Guide" in the BuildTools? wiki would be appreciated.

#83 fixed user-windows page needs update somebody stefan
Description

At https://projects.coin-or.org/BuildTools/wiki/user-configure, the page https://projects.coin-or.org/BuildTools/wiki/user-windows is referenced. It says it is a "draft" and seem to need some maintenance.

Note: See TracQuery for help on using queries.