All,
I noticed, around half a year ago, that the incredible team around glibc
found the time to implement vector math (libm) routines.
Previously, free software adherents like me were dependent on vendor
libraries via the -mveclibabi={svml|acml} (on Intel/AMD) for instance.
However, the examples given on the glibc wiki
(https://sourceware.org/glibc/wiki/libmvec, Example 1/Example 2) suggest
that this is a C-only thing (this might make sense given that glibc is
an implementation of the *C* library), but the above vendor-level
options at least work for every front-end language, as far as I know.
Would it be possible to add an option -mveclibabi=glibc to cater for
this *for all languages*; or is this too low level (after all, the glibc
libmvec has code for multiple architectures). If so, at what level
should this be implemented ?
[ This is relevant for our code, because just the switch to *actual*
single precision exp/log/sin/cos implementations in glibc's libm
resulted in a decrease of the running time of our weather forecasting
code by 25 % (this was in glibc 2.16, IIRC). ]
Thanks in advance for your suggestions.
--
Toon Moene - e-mail: t...@moene.org - phone: +31 346 214290
Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
At home: http://moene.org/~toon/; weather: http://moene.org/~hirlam/
Progress of GNU Fortran: http://gcc.gnu.org/wiki/GFortran#news
