r148277 - in /trunk/gcc: ChangeLog doc/invoke.t...

[dwarak@gcc.gnu.org]

Author: dwarak
Date: Mon Jun  8 16:00:13 2009
New Revision: 148277

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=148277
Log:
2009-06-08  Ghassan Shobaki  <ghassan.shobaki@amd.com>
            Dwarakanath Rajagopal  <dwarak.rajagopal@amd.com>
        
        * tree-ssa-loop-prefetch.c 
        (gather_memory_references): Introduced a counter for the number of 
        memory references.
        (anything_to_prefetch_p): Introduced a counter for the number of 
        prefetches.
        (is_loop_prefetching_profitable): New function with a cost model 
        for prefetching.
        (loop_prefetch_arrays): Use the new cost model to determine if 
        prefetching is profitable.
        * params.def (MIN_INSN_TO_PREFETCH_RATIO, 
        PREFETCH_MIN_INSN_TO_MEM_RATIO): New parameters.
        * params.h (MIN_INSN_TO_PREFETCH_RATIO, 
        PREFETCH_MIN_INSN_TO_MEM_RATIO): New parameters.
        * doc/invoke.texi (MIN_INSN_TO_PREFETCH_RATIO, 
        PREFETCH_MIN_INSN_TO_MEM_RATIO): New parameters.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/doc/invoke.texi
    trunk/gcc/params.def
    trunk/gcc/params.h
    trunk/gcc/tree-ssa-loop-prefetch.c