[kde-solaris] [preannouncement] KDE 3.3.1 Solaris 8/9 SPARC Forte
lars.tunkrans at bredband.net
Tue Nov 2 19:08:44 CET 2004
Stefan Teleman wrote:
> If you disagree, feel free to notify the compiler team at Sun.
> On Tuesday 02 November 2004 03:18, Christopher Layne wrote:
>>30%? Come on.
If you compile with studio8/9 compiler directive "xtarget=ultra"
its probably not 30%. Well its if you compare with GCC 2.95 and earlier.
GCC 3.3 an later have a revamped optimizer for Ultrasparc that closes the gap
to about 15% perfomance advantage for studio8. I assume that studio9
got a bit better than studio8 so maybe its in the vincinity of 20% for
The 900 Mhz UltraSparc III-CU and later model processors has a
Branch prediction logic that enables the processor to prefetch
the right instructions after a branch and prevent Cache-miss main
memory instruction fetches.
This circutry gets enabled with the "xtarget=ultra3" or "xtarget=ultra3i"
( for the UltraSparc III-i processor ) compiler directives.
Then the performance differance is certainly 30%. Because you avoid a
large number of the execution pipeline stall's that you have otherwise.
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