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invoke.texi (Optimiza Options): Document new -fipa-struct-reorg option and struct-reorg-cold-struct-ratio parameter.

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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
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Golovanevsky Olga 2007-12-13 11:11:57 +00:00 committed by Olga Golovanevsky
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commit 5bb06e1856
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@ -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

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gcc/doc/invoke.texi
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@ -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