Help for data prefetch for sparc using gcc

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Help for data prefetch for sparc using gcc
\ yuazhang (31 Mar 2007)

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Subject:	Help for data prefetch for sparc using gcc
Group:	Gcc-help
From:	yuazhang
Date:	31 Mar 2007

Hi,

Could you help me to forward and contact the person in charge of GCC
data prefetching part? I have the question below:

Right now, I am using GCC 3.3 version on Sparc V9 machine. I want to
generate date prefetch instructions with -fprefetch-loop-arrays for my
benchmark zyr-bt.c. but it doesn't generate any "prefetch"
instruciont, with using the command line:

gcc -o2 -mcpu=v9 -fprefetch-loop-arrays -S zyr-bt.c

The machine is
Machine hardware: sun4u
OS version: 5.9
Processor type: sparc
Hardware: SUNW,Sun-Fire-880

Could you tell me how to use -fprefetch-loop-arrays to generate data
prefetches? Are there any requirement for the application program?

Thank you very much!
Look forward to hear from you!

Regards,
Ray