r159514 - in /trunk/gcc: ChangeLog tree-ssa-loo...

[spop@gcc.gnu.org]

Author: spop
Date: Mon May 17 22:33:53 2010
New Revision: 159514

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=159514
Log:
Define PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO heuristic.

2010-05-17  Changpeng Fang  <changpeng.fang@amd.com>

	* tree-ssa-loop-prefetch.c (PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO): New.
	(schedule_prefetches): Do not generate a prefetch if the unroll factor
	is far from what is required by the prefetch.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-loop-prefetch.c