On 03 Apr 2010, at 13:00, C Western wrote: > I notice that the cmem unit does not align memory in the same way as the > default unit - removing the cmem unit makes a factor of two difference in the > speed of some double precision matrix code. (My system is i386). Inspecting > the cmem unit indicates the issue is the extra bytes allocated for the count > - is this really needed?
It is to be able to implement the same checking as the Pascal version has (give a run time error in case someone calls freemem(p,size) with the wrong size). BSD variants have a malloc_size() function that could be used instead, but at least Solaris and Linux don't seem to have something similar. > Or do we have to allocate more bytes for blocks that are a multiple of 8? FPC's default memory manager even guarantees 16 byte alignment (for vectors). Jonas_______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
