From cTuning.org
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== Key data structures == | == Key data structures == | ||
| - | '''Information from xml files for function cloning and instrumentation. ''' | + | '''Information from xml files for function cloning and instrumentation through ICI plugin. ''' |
| - | Defined in <tt>gcc/highlev-plugin-internal.h</tt> and <tt>gcc/highlev-plugin.h</tt>: | + | Defined in both <tt>gcc/highlev-plugin-internal.h</tt> and <tt>gcc/highlev-plugin.h</tt>: |
<pre> | <pre> | ||
typedef struct { | typedef struct { | ||
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=== Work flow === | === Work flow === | ||
| + | Three steps compilation: | ||
=== Scripts === | === Scripts === | ||
| + | '''adaptutil.py''' | ||
| + | === Linking external library === | ||
== New ICI event == | == New ICI event == | ||
Revision as of 08:59, 11 August 2009
Google Summer of Code 2009: Generic function cloning.
Liang Peng (ICT, China)
Based on Run-time Function Adaptation for Statically-Compiled Programs based on function multiversioning and FunctionSpecificOpt, we enabled generic function cloning with low-overhead program behavior monitoring routines. It will enable fine-grain self-tuning binaries and libraries and will increase performance and portability of the static code which is particularly important for rapidly evolving hardware and virtual enviroments.
Contents |
Key data structures
Information from xml files for function cloning and instrumentation through ICI plugin.
Defined in both gcc/highlev-plugin-internal.h and gcc/highlev-plugin.h:
typedef struct {
/* number of function to clone. */
int numofclonefun;
/* function name list. */
char **clone_function_list;
/* corresponding filename of function. */
char **function_filename_list;
/* corresponding number of clones. */
int *clones;
/* corresponding function name extension for clone. */
char **clone_extension;
/* corresponding adaptation function name for current function . */
char **adaptation_function;
/* option list for clone . */
char **clone_option;
/* corresponding external libraries. */
char *external_libraries;
} cloneinfo ;
typedef struct {
/* number of function to instrument. */
int numofinstrfun;
/* function name list. */
char **instrument_function_list;
/* corresponding filename of function. */
char **function_filename_list;
/* name of function instrument at the begin of function. */
char **timer1;
/* name of function instrument at the end of function. */
char **timer2;
/* flag list whether function is cloned. */
char *cloned;
} instrinfo ;
Function cloning
Description
SIMPLE_IPA_PASS "generic_cloning"
This pass performs generic function cloning. It has the ability to create any number of clones for a given function on demand, and aply different fine-grain optimizations for a given clone, also provide mechanism to select different clones at run-time based on optimization scenarios. It can be triggered by GCC option -fapi-clone-function and ICI adaptation framework. The information come from xml files through ICI.
Primary functions
exec_clone_functions (void)
add_call_to_clones (struct cgraph_node *orig, int nid)
get_arguments (tree tree_list)
parse_arguments (char *text, unsigned int *argc)
find_clone_options (char *funcname, int *nid)
is_in_clone_list (const char *func_name, const char *file_name, int *nid)
freecloneinfo (cloneinfo cdi)
is_it_clonable (struct cgraph_node *cg_func)
is_it_main (struct cgraph_node *cg_func)
Work flow
Instrumentation
Description
SIMPLE_IPA_PASS "Instrumentation"
This pass performs function instrumentation. Currently, it has only ability to add function calls and selection mechanism to choose clones based on the external library monitoring routines. We also have the ability to link external libraries transparently withou Makefile modifications. This pass also can be triggered by GCC option fapi-instrument-functions and ICI adaptation framework. The information come from xml files through ICI.
Primary functions
exec_instrument_functions (void)
add_timer_begin (struct cgraph_node *cg_func, char *funname, int cloned)
add_timer_end (struct cgraph_node *cg_func, char *funname)
freeinstrinfo (instrinfo idi)
is_in_instrument_list (const char *func_name, const char *file_name, int *nid)
is_it_instrumentable (struct cgraph_node *cg_func)
Work flow
ICI Adaptation
Work flow
Three steps compilation:
Scripts
adaptutil.py
Linking external library
New ICI event
ICI event "load_instr_config"
Call this event at the very beginning of function cloning pass. Call back function: load_clone_config ()
ICI event “load_clone_config”
Call this event at the very beginning of function instrumentation pass. Call back function : load_instr_config ()