* 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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@89711 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/params.def b/gcc/params.def
index 79c55bcd2c1..5bde4a16c77 100644
--- a/gcc/params.def
+++ b/gcc/params.def
@@ -35,6 +35,25 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 
    Be sure to add an entry to invoke.texi summarizing the parameter.  */
 
+/* The maximum structure size at which the scalar replacement of
+   aggregates (SRA) pass will perform block copies.  The default
+   value, 0, implies that GCC will select the most appropriate size
+   itself.  */
+DEFPARAM (PARAM_SRA_MAX_STRUCTURE_SIZE,
+	  "sra-max-structure-size",
+	  "The maximum structure size (in bytes) at which GCC will do block copies.",
+	  0)
+
+/* The ratio 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%.  */
+DEFPARAM (PARAM_SRA_FIELD_STRUCTURE_RATIO,
+	  "sra-field-structure-ratio",
+	  "The threshold ratio between instantiated fields and the total structure size.",
+	  75)
+
 /* The single function inlining limit. This is the maximum size
    of a function counted in internal gcc instructions (not in
    real machine instructions) that is eligible for inlining