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| author | Jeff Law <law@redhat.com> | 2011-01-13 06:41:03 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2011-01-13 06:41:03 -0700 |
| commit | 29fa95ed577bb9080f25c4d3d8c694b40051e87a (patch) | |
| tree | 63481903a2a1e2fc61101558fa5703b5c7af933d /gcc/doc | |
| parent | 71d12276670423b5a6bc35ba79feb481feed7c31 (diff) | |
| download | gcc-29fa95ed577bb9080f25c4d3d8c694b40051e87a.zip gcc-29fa95ed577bb9080f25c4d3d8c694b40051e87a.tar.gz gcc-29fa95ed577bb9080f25c4d3d8c694b40051e87a.tar.bz2 | |
re PR rtl-optimization/39077 (GCSE-optimization causes enormous binary size increase (~20 times !))
* PR rtl-optimization/39077
* doc/invoke.texi (max-gcse-insertion-ratio): Document.
* params.h (MAX_GCSE_INSERTION_RATIO): Define.
* params.def (PARAM_MAX_GCSE_INSERTION_RATIO): Define.
* lcm.c (pre_edge_lcm): Properly initialize output sbitmaps.
* gcse.c (prune_insertions_deletions): New function.
(compute_pre_data): Use it.
From-SVN: r168747
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index e5ba12c..0a1625f 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -1,5 +1,5 @@ @c Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, -@c 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 +@c 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 @c Free Software Foundation, Inc. @c This is part of the GCC manual. @c For copying conditions, see the file gcc.texi. @@ -8227,6 +8227,11 @@ order to perform the global common subexpression elimination optimization. If more memory than specified is required, the optimization will not be done. +@item max-gcse-insertion-ratio +If the ratio of expression insertions to deletions is larger than this value +for any expression, then RTL PRE will insert or remove the expression and thus +leave partially redundant computations in the instruction stream. The default value is 20. + @item max-pending-list-length The maximum number of pending dependencies scheduling will allow before flushing the current state and starting over. Large functions |