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
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