I'm told that Niagara T1 only has few VIS instructions which run in a shared FPU and emulates others but Niagara T2 implements the full set running in a per core FPU.
Olga On Tue, Mar 30, 2010 at 5:13 PM, Garrett D'Amore <garr...@damore.org> wrote: > On 03/30/10 12:34 AM, jf simon wrote: >> >> Hi, >> >> Bart Smaalders wrote: >> >>> >>> The libc mem* routines already use VIS instructions to good effect on >>> SPARC platforms, and platform teams regularly enhance these functions >>> for both existing and new hardware. >>> >> >> i want to use these VIS enhanced mem* functions on a Niagara T2 >> system. do i need to specify specific options for sun studio in >> CFLAGS? like "-sparcvis" ? or is it just a matter of linking with >> the right libc? >> in short how to be sure i am indeed using VIS? >> > > Are you sure that the CPU on these systems actually supports the VIS > instructions? > > I thought they were only available on UltraSPARC cpus (sun4u) and not sun4v. > Also, if they are available, you might want to make sure that they don't > have the same limitations as floating point on these cpus (no parallelism -- > only one core can be executing floating point at a time) -- if they are > available but without true MT support, then it may actually be > disadvantageous to use them. > > -- Garrett > >> thx a lot >> -jfs >> >> _______________________________________________ >> opensolaris-code mailing list >> opensolaris-code@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/opensolaris-code >> > > _______________________________________________ > opensolaris-code mailing list > opensolaris-code@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/opensolaris-code > -- , _ _ , { \/`o;====- Olga Kryzhanovska -====;o`\/ } .----'-/`-/ olga.kryzhanov...@gmail.com \-`\-'----. `'-..-| / Solaris/BSD//C/C++ programmer \ |-..-'` /\/\ /\/\ `--` `--` _______________________________________________ opensolaris-code mailing list opensolaris-code@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/opensolaris-code
