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| author | Golovanevsky Olga <olga@il.ibm.com> | 2007-12-13 11:11:57 +0000 |
|---|---|---|
| committer | Olga Golovanevsky <olga@gcc.gnu.org> | 2007-12-13 11:11:57 +0000 |
| commit | 5bb06e1856e99aed6db9e0aef34e4bd02721443c (patch) | |
| tree | 60b5db4b98b77ade3f5b287659a6d1ddac7cc95c | |
| parent | b446725a8ad50e83d6024dea0fea93a7be60506b (diff) | |
| download | gcc-5bb06e1856e99aed6db9e0aef34e4bd02721443c.zip gcc-5bb06e1856e99aed6db9e0aef34e4bd02721443c.tar.gz gcc-5bb06e1856e99aed6db9e0aef34e4bd02721443c.tar.bz2 | |
invoke.texi (Optimiza Options): Document new -fipa-struct-reorg option and struct-reorg-cold-struct-ratio parameter.
2007-12-13 Golovanevsky Olga <olga@il.ibm.com>
* doc/invoke.texi (Optimiza Options): Document new -fipa-struct-reorg
option and struct-reorg-cold-struct-ratio parameter.
From-SVN: r130890
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 25 |
2 files changed, 29 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 00bf7c6..952bb9a7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2007-12-13 Golovanevsky Olga <olga@il.ibm.com> + + * doc/invoke.texi (Optimiza Options): Document new -fipa-struct-reorg + option and struct-reorg-cold-struct-ratio parameter. + 2007-12-13 Torbjorn Granlund <tege@swox.com> * config/i386/i386.c (ix86_rtx_costs) [MULT]: Check op0 for diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 3376420..e8431da 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -329,7 +329,7 @@ Objective-C and Objective-C++ Dialects}. -fgcse-sm -fif-conversion -fif-conversion2 -finline-functions @gol -finline-functions-called-once -finline-limit=@var{n} @gol -finline-small-functions -fipa-cp -fipa-marix-reorg -fipa-pta @gol --fipa-pure-const -fipa-reference @gol +-fipa-pure-const -fipa-reference -fipa-struct-reorg @gol -fipa-type-escape -fivopts -fkeep-inline-functions -fkeep-static-consts @gol -fmerge-all-constants -fmerge-constants -fmodulo-sched @gol -fmodulo-sched-allow-regmoves -fmove-loop-invariants -fmudflap @gol @@ -5707,6 +5707,20 @@ Discover which static variables do not escape cannot escape the compilation unit. Enabled by default at @option{-O} and higher. +@item -fipa-struct-reorg +@opindex fipa-struct-reorg +Perform structure reorganization optimization, that change C-like structures +layout in order to better utilize spatial locality. This transformation is +affective for programs containing arrays of structures. Available in two +compilation modes: profile-based (enabled with @option{-fprofile-generate}) +or static (which uses built-in heuristics). Require @option{-fipa-type-escape} +to provide the safety of this transformation. It works only in whole program +mode, so it requires @option{-fwhole-program} and @option{-combine} to be +enabled. Structures considered @samp{cold} by this transformation are not +affected (see @option{--param struct-reorg-cold-struct-ratio=@var{value}}). + +With this flag, the program debug info reflects a new structure layout. + @item -fipa-pta @opindex fipa-pta Perform interprocedural pointer analysis. @@ -6643,6 +6657,15 @@ of bytes in instantiated fields to the number of bytes in the complete structure exceeds this parameter, then block copies are not used. The default is 75. +@item struct-reorg-cold-struct-ratio +The threshold ratio (as a percentage) between a structure frequency +and the frequency of the hottest structure in the program. This parameter +is used by struct-reorg optimization enabled by @option{-fipa-struct-reorg}. +We say that if the ratio of a structure frequency, calculated by profiling, +to the hottest structure frequency in the program is less than this +parameter, then structure reorganization is not applied to this structure. +The default is 10. + @item max-crossjump-edges The maximum number of incoming edges to consider for crossjumping. The algorithm used by @option{-fcrossjumping} is @math{O(N^2)} in |