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IA-64 anti-dependence stalls
- To: gcc at gcc dot gnu dot org
- Subject: IA-64 anti-dependence stalls
- From: Stephen Clarke <Stephen dot Clarke at st dot com>
- Date: Fri, 10 Aug 2001 17:34:26 -0700
- Organization: STMicroelectronics
In the minutes of the IA-64 gcc summit at
the following was listed as "Unfinished and/or abandoned work":
> - A new pass to use more registers to avoid an anti-dependence stall in
> Itanium that David Mosberger discovered.
> The new pass uses more registers. By default the register allocator
> will use as few registers as possible, which isn't always the right
> thing to do. This change resulted in very measurable speed-ups of
> 5-6% when using more registers on IPF.
We're doing some microarchitecture experiments that may benefit from this
idea -- can anyone provide more information on what was done, and
whether this code is public?
Stephen Clarke, Micro Cores & Development Tools, STMicroelectronics
Phone:1-408-922-4062, Fax:1-408-895-3069, mailto:Stephen.Clarke@st.com
Mail: STMicroelectronics, 1060 E. Brokaw Rd., San Jose, CA 95131.