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| author | Ben Elliston <bje@au.ibm.com> | 2004-10-27 21:02:16 +0000 |
|---|---|---|
| committer | Ben Elliston <bje@gcc.gnu.org> | 2004-10-28 07:02:16 +1000 |
| commit | 61b5800161f855eb1028cd76ad200bd0d63b2b77 (patch) | |
| tree | 13fd3cfcb73f6650e4dab5d9115c569183d1183a /gcc/doc | |
| parent | 72111a1f4bb7d88865ee53bdc2fc26db58c534ca (diff) | |
| download | gcc-61b5800161f855eb1028cd76ad200bd0d63b2b77.zip gcc-61b5800161f855eb1028cd76ad200bd0d63b2b77.tar.gz gcc-61b5800161f855eb1028cd76ad200bd0d63b2b77.tar.bz2 | |
params.def (PARAM_SRA_MAX_STRUCTURE_SIZE): New.
* params.def (PARAM_SRA_MAX_STRUCTURE_SIZE): New.
(PARAM_SRA_FIELD_STRUCTURE_RATIO): Likewise.
* params.h (SRA_MAX_STRUCTURE_SIZE): New.
(SRA_FIELD_STRUCTURE_RATIO): Likewise.
* tree-sra.c: Include "params.h".
(decide_block_copy): Use new parameters.
* doc/invoke.texi (Optimize Options): Document new SRA pass
parameters sra-max-structure-size and sra-field-structure-ratio.
[testsuite]
* gcc.dg/tree-ssa/sra-1.c: Pass --param sra-max-structure-size.
From-SVN: r89711
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 990b83c..ceeae22 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -5313,6 +5313,19 @@ In each case, the @var{value} is an integer. The allowable choices for @var{name} are given in the following table: @table @gcctabopt +@item sra-max-structure-size +The maximum structure size, in bytes, at which the scalar replacement +of aggregates (SRA) optimization will perform block copies. The +default value, 0, implies that GCC will select the most appropriate +size itself. + +@item sra-field-structure-ratio +The treshold ratio (as a percentage) between instantiated fields and +the complete structure size. We say that if the ratio of the number +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 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 |