/* Interprocedural constant propagation
- Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by Razya Ladelsky <RAZYA@il.ibm.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
-/* Interprocedural constant propagation.
- The aim of interprocedural constant propagation (IPCP) is to find which
- function's argument has the same constant value in each invocation throughout
- the whole program. For example, for an application consisting of two files,
- foo1.c, foo2.c:
+/* Interprocedural constant propagation. The aim of interprocedural constant
+ propagation (IPCP) is to find which function's argument has the same
+ constant value in each invocation throughout the whole program. For example,
+ consider the following program:
- foo1.c contains :
+ int g (int y)
+ {
+ printf ("value is %d",y);
+ }
int f (int x)
{
g (x);
}
- void main (void)
- {
- f (3);
- h (3);
- }
-
- foo2.c contains :
-
+
int h (int y)
{
g (y);
}
- int g (int y)
+
+ void main (void)
{
- printf ("value is %d",y);
+ f (3);
+ h (3);
}
- The IPCP algorithm will find that g's formal argument y
- is always called with the value 3.
- The algorithm used is based on "Interprocedural Constant Propagation",
- by Challahan David, Keith D Cooper, Ken Kennedy, Linda Torczon, Comp86,
- pg 152-161
+ The IPCP algorithm will find that g's formal argument y is always called
+ with the value 3.
+
+ The algorithm used is based on "Interprocedural Constant Propagation", by
+ Challahan David, Keith D Cooper, Ken Kennedy, Linda Torczon, Comp86, pg
+ 152-161
The optimization is divided into three stages:
First stage - intraprocedural analysis
=======================================
- This phase computes jump_function and modify information.
+ This phase computes jump_function and modification flags.
- A jump function for a callsite represents the values passed as actual
- arguments
- of the callsite. There are three types of values :
- Formal - the caller's formal parameter is passed as an actual argument.
+ A jump function for a callsite represents the values passed as an actual
+ arguments of a given callsite. There are three types of values:
+ Pass through - the caller's formal parameter is passed as an actual argument.
Constant - a constant is passed as an actual argument.
Unknown - neither of the above.
- In order to compute the jump functions, we need the modify information for
- the formal parameters of methods.
-
- The jump function info, ipa_jump_func, is defined in ipa_edge
+ The jump function info, ipa_jump_func, is stored in ipa_edge_args
structure (defined in ipa_prop.h and pointed to by cgraph_node->aux)
- The modify info, ipa_modify, is defined in ipa_node structure
+ modified_flags are defined in ipa_node_params structure
(defined in ipa_prop.h and pointed to by cgraph_edge->aux).
-ipcp_init_stage() is the first stage driver.
Second stage - interprocedural analysis
========================================
This phase does the interprocedural constant propagation.
- It computes for all formal parameters in the program
- their cval value that may be:
+ It computes lattices for all formal parameters in the program
+ and their value that may be:
TOP - unknown.
BOTTOM - non constant.
- CONSTANT_TYPE - constant value.
+ CONSTANT - constant value.
- Cval of formal f will have a constant value if all callsites to this
- function have the same constant value passed to f.
+ Lattice describing a formal parameter p will have a constant value if all
+ callsites invoking this function have the same constant value passed to p.
- The cval info, ipcp_formal, is defined in ipa_node structure
- (defined in ipa_prop.h and pointed to by cgraph_edge->aux).
+ The lattices are stored in ipcp_lattice which is itself in ipa_node_params
+ structure (defined in ipa_prop.h and pointed to by cgraph_edge->aux).
-ipcp_iterate_stage() is the second stage driver.
- Third phase - transformation of methods code
+ Third phase - transformation of function code
============================================
Propagates the constant-valued formals into the function.
- For each method mt, whose parameters are consts, we create a clone/version.
+ For each function whose parameters are constants, we create its clone.
- We use two ways to annotate the versioned function with the constant
- formal information:
+ Then we process the clone in two ways:
1. We insert an assignment statement 'parameter = const' at the beginning
- of the cloned method.
- 2. For read-only formals whose address is not taken, we replace all uses
- of the formal with the constant (we provide versioning with an
- ipa_replace_map struct representing the trees we want to replace).
+ of the cloned function.
+ 2. For read-only parameters that do not live in memory, we replace all their
+ uses with the constant.
- We also need to modify some callsites to call to the cloned methods instead
- of the original ones. For a callsite passing an argument found to be a
+ We also need to modify some callsites to call the cloned functions instead
+ of the original ones. For a callsite passing an argument found to be a
constant by IPCP, there are two different cases to handle:
- 1. A constant is passed as an argument.
- 2. A parameter (of the caller) passed as an argument (pass through argument).
-
- In the first case, the callsite in the original caller should be redirected
- to call the cloned callee.
- In the second case, both the caller and the callee have clones
- and the callsite of the cloned caller would be redirected to call to
- the cloned callee.
-
- The callgraph is updated accordingly.
-
- This update is done in two stages:
- First all cloned methods are created during a traversal of the callgraph,
- during which all callsites are redirected to call the cloned method.
- Then the callsites are traversed and updated as described above.
+ 1. A constant is passed as an argument. In this case the callsite in the
+ should be redirected to call the cloned callee.
+ 2. A parameter (of the caller) passed as an argument (pass through
+ argument). In such cases both the caller and the callee have clones and
+ only the callsite in the cloned caller is redirected to call to the
+ cloned callee.
+
+ This update is done in two steps: First all cloned functions are created
+ during a traversal of the call graph, during which all callsites are
+ redirected to call the cloned function. Then the callsites are traversed
+ and many calls redirected back to fit the description above.
-ipcp_insert_stage() is the third phase driver.
#include "diagnostic.h"
#include "tree-dump.h"
#include "tree-inline.h"
+#include "fibheap.h"
+#include "params.h"
+
+/* Number of functions identified as candidates for cloning. When not cloning
+ we can simplify iterate stage not forcing it to go through the decision
+ on what is profitable and what not. */
+static int n_cloning_candidates;
+
+/* Maximal count found in program. */
+static gcov_type max_count;
-/* Get orig node field of ipa_node associated with method MT. */
+/* Cgraph nodes that has been completely replaced by cloning during iterate
+ * stage and will be removed after ipcp is finished. */
+static bitmap dead_nodes;
+
+static void ipcp_print_profile_data (FILE *);
+static void ipcp_function_scale_print (FILE *);
+
+/* Get the original node field of ipa_node_params associated with node NODE. */
static inline struct cgraph_node *
-ipcp_method_orig_node (struct cgraph_node *mt)
+ipcp_get_orig_node (struct cgraph_node *node)
{
- return IPA_NODE_REF (mt)->ipcp_orig_node;
+ return IPA_NODE_REF (node)->ipcp_orig_node;
}
-/* Return true if NODE is a cloned/versioned method. */
+/* Return true if NODE describes a cloned/versioned function. */
static inline bool
-ipcp_method_is_cloned (struct cgraph_node *node)
+ipcp_node_is_clone (struct cgraph_node *node)
{
- return (ipcp_method_orig_node (node) != NULL);
+ return (ipcp_get_orig_node (node) != NULL);
}
-/* Set ORIG_NODE in ipa_node associated with method NODE. */
-static inline void
-ipcp_method_set_orig_node (struct cgraph_node *node,
- struct cgraph_node *orig_node)
+/* Create ipa_node_params and its data structures for NEW_NODE. Set ORIG_NODE
+ as the ipcp_orig_node field in ipa_node_params. */
+static void
+ipcp_init_cloned_node (struct cgraph_node *orig_node,
+ struct cgraph_node *new_node)
{
- IPA_NODE_REF (node)->ipcp_orig_node = orig_node;
+ ipa_check_create_node_params ();
+ ipa_initialize_node_params (new_node);
+ IPA_NODE_REF (new_node)->ipcp_orig_node = orig_node;
}
-/* Create ipa_node and its data structures for NEW_NODE.
- Set ORIG_NODE as the orig_node field in ipa_node. */
+/* Perform intraprocedrual analysis needed for ipcp. */
static void
-ipcp_cloned_create (struct cgraph_node *orig_node,
- struct cgraph_node *new_node)
+ipcp_analyze_node (struct cgraph_node *node)
{
- ipa_node_create (new_node);
- ipcp_method_set_orig_node (new_node, orig_node);
- ipa_method_formal_compute_count (new_node);
- ipa_method_compute_tree_map (new_node);
-}
+ /* Unreachable nodes should have been eliminated before ipcp. */
+ gcc_assert (node->needed || node->reachable);
-/* Return cval_type field of CVAL. */
-static inline enum cvalue_type
-ipcp_cval_get_cvalue_type (struct ipcp_formal *cval)
-{
- return cval->cval_type;
+ ipa_initialize_node_params (node);
+ ipa_detect_param_modifications (node);
}
-/* Return scale for MT. */
+/* Return scale for NODE. */
static inline gcov_type
-ipcp_method_get_scale (struct cgraph_node *mt)
+ipcp_get_node_scale (struct cgraph_node *node)
{
- return IPA_NODE_REF (mt)->count_scale;
+ return IPA_NODE_REF (node)->count_scale;
}
-/* Set COUNT as scale for MT. */
+/* Set COUNT as scale for NODE. */
static inline void
-ipcp_method_set_scale (struct cgraph_node *node, gcov_type count)
+ipcp_set_node_scale (struct cgraph_node *node, gcov_type count)
{
IPA_NODE_REF (node)->count_scale = count;
}
-/* Set TYPE as cval_type field of CVAL. */
-static inline void
-ipcp_cval_set_cvalue_type (struct ipcp_formal *cval, enum cvalue_type type)
-{
- cval->cval_type = type;
-}
-
-/* Return cvalue field of CVAL. */
-static inline union parameter_info *
-ipcp_cval_get_cvalue (struct ipcp_formal *cval)
-{
- return &(cval->cvalue);
-}
-
-/* Set VALUE as cvalue field CVAL. */
-static inline void
-ipcp_cval_set_cvalue (struct ipcp_formal *cval, union parameter_info *value,
- enum cvalue_type type)
-{
- if (type == CONST_VALUE || type == CONST_VALUE_REF)
- cval->cvalue.value = value->value;
-}
-
-/* Return whether TYPE is a constant type. */
-static bool
-ipcp_type_is_const (enum cvalue_type type)
+/* Return whether LAT is a constant lattice. */
+static inline bool
+ipcp_lat_is_const (struct ipcp_lattice *lat)
{
- if (type == CONST_VALUE || type == CONST_VALUE_REF)
+ if (lat->type == IPA_CONST_VALUE)
return true;
else
return false;
}
-/* Return true if CONST_VAL1 and CONST_VAL2 are equal. */
+/* Return whether LAT is a constant lattice that ipa-cp can actually insert
+ into the code (i.e. constants excluding member pointers and pointers). */
static inline bool
-ipcp_cval_equal_cvalues (union parameter_info *const_val1,
- union parameter_info *const_val2,
- enum cvalue_type type1, enum cvalue_type type2)
+ipcp_lat_is_insertable (struct ipcp_lattice *lat)
{
- gcc_assert (ipcp_type_is_const (type1) && ipcp_type_is_const (type2));
- if (type1 != type2)
+ return lat->type == IPA_CONST_VALUE;
+}
+
+/* Return true if LAT1 and LAT2 are equal. */
+static inline bool
+ipcp_lats_are_equal (struct ipcp_lattice *lat1, struct ipcp_lattice *lat2)
+{
+ gcc_assert (ipcp_lat_is_const (lat1) && ipcp_lat_is_const (lat2));
+ if (lat1->type != lat2->type)
return false;
- if (operand_equal_p (const_val1->value, const_val2->value, 0))
+ if (operand_equal_p (lat1->constant, lat2->constant, 0))
return true;
return false;
}
/* Compute Meet arithmetics:
- Meet (BOTTOM, x) = BOTTOM
- Meet (TOP,x) = x
- Meet (const_a,const_b) = BOTTOM, if const_a != const_b.
+ Meet (IPA_BOTTOM, x) = IPA_BOTTOM
+ Meet (IPA_TOP,x) = x
+ Meet (const_a,const_b) = IPA_BOTTOM, if const_a != const_b.
MEET (const_a,const_b) = const_a, if const_a == const_b.*/
static void
-ipcp_cval_meet (struct ipcp_formal *cval, struct ipcp_formal *cval1,
- struct ipcp_formal *cval2)
+ipa_lattice_meet (struct ipcp_lattice *res, struct ipcp_lattice *lat1,
+ struct ipcp_lattice *lat2)
{
- if (ipcp_cval_get_cvalue_type (cval1) == BOTTOM
- || ipcp_cval_get_cvalue_type (cval2) == BOTTOM)
+ if (lat1->type == IPA_BOTTOM || lat2->type == IPA_BOTTOM)
{
- ipcp_cval_set_cvalue_type (cval, BOTTOM);
+ res->type = IPA_BOTTOM;
return;
}
- if (ipcp_cval_get_cvalue_type (cval1) == TOP)
+ if (lat1->type == IPA_TOP)
{
- ipcp_cval_set_cvalue_type (cval, ipcp_cval_get_cvalue_type (cval2));
- ipcp_cval_set_cvalue (cval, ipcp_cval_get_cvalue (cval2),
- ipcp_cval_get_cvalue_type (cval2));
+ res->type = lat2->type;
+ res->constant = lat2->constant;
return;
}
- if (ipcp_cval_get_cvalue_type (cval2) == TOP)
+ if (lat2->type == IPA_TOP)
{
- ipcp_cval_set_cvalue_type (cval, ipcp_cval_get_cvalue_type (cval1));
- ipcp_cval_set_cvalue (cval, ipcp_cval_get_cvalue (cval1),
- ipcp_cval_get_cvalue_type (cval1));
+ res->type = lat1->type;
+ res->constant = lat1->constant;
return;
}
- if (!ipcp_cval_equal_cvalues (ipcp_cval_get_cvalue (cval1),
- ipcp_cval_get_cvalue (cval2),
- ipcp_cval_get_cvalue_type (cval1),
- ipcp_cval_get_cvalue_type (cval2)))
+ if (!ipcp_lats_are_equal (lat1, lat2))
{
- ipcp_cval_set_cvalue_type (cval, BOTTOM);
+ res->type = IPA_BOTTOM;
return;
}
- ipcp_cval_set_cvalue_type (cval, ipcp_cval_get_cvalue_type (cval1));
- ipcp_cval_set_cvalue (cval, ipcp_cval_get_cvalue (cval1),
- ipcp_cval_get_cvalue_type (cval1));
+ res->type = lat1->type;
+ res->constant = lat1->constant;
}
-/* Return cval structure for the formal at index INFO_TYPE in MT. */
-static inline struct ipcp_formal *
-ipcp_method_cval (struct cgraph_node *mt, int info_type)
+/* Return the lattice corresponding to the Ith formal parameter of the function
+ described by INFO. */
+static inline struct ipcp_lattice *
+ipcp_get_lattice (struct ipa_node_params *info, int i)
{
- return &(IPA_NODE_REF (mt)->ipcp_cval[info_type]);
+ return &(info->params[i].ipcp_lattice);
}
-/* Given the jump function (TYPE, INFO_TYPE), compute a new value of CVAL.
- If TYPE is FORMAL_IPA_TYPE, the cval of the corresponding formal is
- drawn from MT. */
+/* Given the jump function JFUNC, compute the lattice LAT that describes the
+ value coming down the callsite. INFO describes the caller node so that
+ pass-through jump functions can be evaluated. */
static void
-ipcp_cval_compute (struct ipcp_formal *cval, struct cgraph_node *mt,
- enum jump_func_type type, union parameter_info *info_type)
+ipcp_lattice_from_jfunc (struct ipa_node_params *info, struct ipcp_lattice *lat,
+ struct ipa_jump_func *jfunc)
{
- if (type == UNKNOWN_IPATYPE)
- ipcp_cval_set_cvalue_type (cval, BOTTOM);
- else if (type == CONST_IPATYPE)
+ if (jfunc->type == IPA_JF_CONST)
{
- ipcp_cval_set_cvalue_type (cval, CONST_VALUE);
- ipcp_cval_set_cvalue (cval, info_type, CONST_VALUE);
+ lat->type = IPA_CONST_VALUE;
+ lat->constant = jfunc->value.constant;
}
- else if (type == CONST_IPATYPE_REF)
+ else if (jfunc->type == IPA_JF_PASS_THROUGH)
{
- ipcp_cval_set_cvalue_type (cval, CONST_VALUE_REF);
- ipcp_cval_set_cvalue (cval, info_type, CONST_VALUE_REF);
+ struct ipcp_lattice *caller_lat;
+ tree cst;
+
+ caller_lat = ipcp_get_lattice (info, jfunc->value.pass_through.formal_id);
+ lat->type = caller_lat->type;
+ if (caller_lat->type != IPA_CONST_VALUE)
+ return;
+ cst = caller_lat->constant;
+
+ if (jfunc->value.pass_through.operation != NOP_EXPR)
+ {
+ tree restype;
+ if (TREE_CODE_CLASS (jfunc->value.pass_through.operation)
+ == tcc_comparison)
+ restype = boolean_type_node;
+ else
+ restype = TREE_TYPE (cst);
+ cst = fold_binary (jfunc->value.pass_through.operation,
+ restype, cst, jfunc->value.pass_through.operand);
+ }
+ if (!cst || !is_gimple_ip_invariant (cst))
+ lat->type = IPA_BOTTOM;
+ lat->constant = cst;
}
- else if (type == FORMAL_IPATYPE)
+ else if (jfunc->type == IPA_JF_ANCESTOR)
{
- enum cvalue_type type =
- ipcp_cval_get_cvalue_type (ipcp_method_cval
- (mt, info_type->formal_id));
- ipcp_cval_set_cvalue_type (cval, type);
- ipcp_cval_set_cvalue (cval,
- ipcp_cval_get_cvalue (ipcp_method_cval
- (mt, info_type->formal_id)),
- type);
+ struct ipcp_lattice *caller_lat;
+ tree t;
+ bool ok;
+
+ caller_lat = ipcp_get_lattice (info, jfunc->value.ancestor.formal_id);
+ lat->type = caller_lat->type;
+ if (caller_lat->type != IPA_CONST_VALUE)
+ return;
+ if (TREE_CODE (caller_lat->constant) != ADDR_EXPR)
+ {
+ /* This can happen when the constant is a NULL pointer. */
+ lat->type = IPA_BOTTOM;
+ return;
+ }
+ t = TREE_OPERAND (caller_lat->constant, 0);
+ ok = build_ref_for_offset (&t, TREE_TYPE (t),
+ jfunc->value.ancestor.offset,
+ jfunc->value.ancestor.type, false);
+ if (!ok)
+ {
+ lat->type = IPA_BOTTOM;
+ lat->constant = NULL_TREE;
+ }
+ else
+ lat->constant = build_fold_addr_expr (t);
}
+ else
+ lat->type = IPA_BOTTOM;
}
-/* True when CVAL1 and CVAL2 values are not the same. */
+/* True when OLD_LAT and NEW_LAT values are not the same. */
+
static bool
-ipcp_cval_changed (struct ipcp_formal *cval1, struct ipcp_formal *cval2)
+ipcp_lattice_changed (struct ipcp_lattice *old_lat,
+ struct ipcp_lattice *new_lat)
{
- if (ipcp_cval_get_cvalue_type (cval1) == ipcp_cval_get_cvalue_type (cval2))
+ if (old_lat->type == new_lat->type)
{
- if (ipcp_cval_get_cvalue_type (cval1) != CONST_VALUE &&
- ipcp_cval_get_cvalue_type (cval1) != CONST_VALUE_REF)
+ if (!ipcp_lat_is_const (old_lat))
return false;
- if (ipcp_cval_equal_cvalues (ipcp_cval_get_cvalue (cval1),
- ipcp_cval_get_cvalue (cval2),
- ipcp_cval_get_cvalue_type (cval1),
- ipcp_cval_get_cvalue_type (cval2)))
+ if (ipcp_lats_are_equal (old_lat, new_lat))
return false;
}
return true;
}
-/* Create cval structure for method MT. */
-static inline void
-ipcp_formal_create (struct cgraph_node *mt)
-{
- IPA_NODE_REF (mt)->ipcp_cval =
- XCNEWVEC (struct ipcp_formal, ipa_method_formal_count (mt));
-}
-
-/* Set cval structure of I-th formal of MT to CVAL. */
-static inline void
-ipcp_method_cval_set (struct cgraph_node *mt, int i, struct ipcp_formal *cval)
-{
- IPA_NODE_REF (mt)->ipcp_cval[i].cval_type = cval->cval_type;
- ipcp_cval_set_cvalue (ipcp_method_cval (mt, i),
- ipcp_cval_get_cvalue (cval), cval->cval_type);
-}
-
-/* Set type of cval structure of formal I of MT to CVAL_TYPE1. */
-static inline void
-ipcp_method_cval_set_cvalue_type (struct cgraph_node *mt, int i,
- enum cvalue_type cval_type1)
-{
- IPA_NODE_REF (mt)->ipcp_cval[i].cval_type = cval_type1;
-}
-
-/* Print ipcp_cval data structures to F. */
+/* Print all ipcp_lattices of all functions to F. */
static void
-ipcp_method_cval_print (FILE * f)
+ipcp_print_all_lattices (FILE * f)
{
struct cgraph_node *node;
int i, count;
- tree cvalue;
- fprintf (f, "\nCVAL PRINT\n");
+ fprintf (f, "\nLattice:\n");
for (node = cgraph_nodes; node; node = node->next)
{
- fprintf (f, "Printing cvals %s:\n", cgraph_node_name (node));
- count = ipa_method_formal_count (node);
+ struct ipa_node_params *info;
+
+ if (!node->analyzed)
+ continue;
+ info = IPA_NODE_REF (node);
+ fprintf (f, " Node: %s:\n", cgraph_node_name (node));
+ count = ipa_get_param_count (info);
for (i = 0; i < count; i++)
{
- if (ipcp_cval_get_cvalue_type (ipcp_method_cval (node, i))
- == CONST_VALUE
- || ipcp_cval_get_cvalue_type (ipcp_method_cval (node, i)) ==
- CONST_VALUE_REF)
+ struct ipcp_lattice *lat = ipcp_get_lattice (info, i);
+
+ fprintf (f, " param [%d]: ", i);
+ if (lat->type == IPA_CONST_VALUE)
{
- fprintf (f, " param [%d]: ", i);
fprintf (f, "type is CONST ");
- cvalue =
- ipcp_cval_get_cvalue (ipcp_method_cval (node, i))->value;
- print_generic_expr (f, cvalue, 0);
+ print_generic_expr (f, lat->constant, 0);
fprintf (f, "\n");
}
- else if (ipcp_method_cval (node, i)->cval_type == TOP)
- fprintf (f, "param [%d]: type is TOP \n", i);
+ else if (lat->type == IPA_TOP)
+ fprintf (f, "type is TOP\n");
else
- fprintf (f, "param [%d]: type is BOTTOM \n", i);
+ fprintf (f, "type is BOTTOM\n");
}
}
}
-/* Initialize ipcp_cval array of MT with TOP values.
- All cvals for a method's formal parameters are initialized to BOTTOM
- The currently supported types are integer types, real types and
- Fortran constants (i.e. references to constants defined as
- const_decls). All other types are not analyzed and therefore are
- assigned with BOTTOM. */
-static void
-ipcp_method_cval_init (struct cgraph_node *mt)
+/* Return true if ipcp algorithms would allow cloning NODE. */
+
+static bool
+ipcp_versionable_function_p (struct cgraph_node *node)
{
- int i;
- tree parm_tree;
+ tree decl = node->decl;
+ basic_block bb;
+
+ /* There are a number of generic reasons functions cannot be versioned. */
+ if (!tree_versionable_function_p (decl))
+ return false;
+
+ /* Removing arguments doesn't work if the function takes varargs. */
+ if (DECL_STRUCT_FUNCTION (decl)->stdarg)
+ return false;
- ipcp_formal_create (mt);
- for (i = 0; i < ipa_method_formal_count (mt); i++)
+ /* Removing arguments doesn't work if we use __builtin_apply_args. */
+ FOR_EACH_BB_FN (bb, DECL_STRUCT_FUNCTION (decl))
{
- parm_tree = ipa_method_get_tree (mt, i);
- if (INTEGRAL_TYPE_P (TREE_TYPE (parm_tree))
- || SCALAR_FLOAT_TYPE_P (TREE_TYPE (parm_tree))
- || POINTER_TYPE_P (TREE_TYPE (parm_tree)))
- ipcp_method_cval_set_cvalue_type (mt, i, TOP);
- else
- ipcp_method_cval_set_cvalue_type (mt, i, BOTTOM);
+ gimple_stmt_iterator gsi;
+ for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+ {
+ const_gimple stmt = gsi_stmt (gsi);
+ tree t;
+
+ if (!is_gimple_call (stmt))
+ continue;
+ t = gimple_call_fndecl (stmt);
+ if (t == NULL_TREE)
+ continue;
+ if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL
+ && DECL_FUNCTION_CODE (t) == BUILT_IN_APPLY_ARGS)
+ return false;
+ }
}
+
+ return true;
}
-/* Create a new assignment statment and make
- it the first statement in the function FN
- tree.
- PARM1 is the lhs of the assignment and
- VAL is the rhs. */
-static void
-constant_val_insert (tree parm1, tree val)
+/* Return true if this NODE is viable candidate for cloning. */
+static bool
+ipcp_cloning_candidate_p (struct cgraph_node *node)
{
- tree init_stmt = NULL;
- edge e_step;
+ int n_calls = 0;
+ int n_hot_calls = 0;
+ gcov_type direct_call_sum = 0;
+ struct cgraph_edge *e;
+
+ /* We never clone functions that are not visible from outside.
+ FIXME: in future we should clone such functions when they are called with
+ different constants, but current ipcp implementation is not good on this.
+ */
+ if (cgraph_only_called_directly_p (node) || !node->analyzed)
+ return false;
- init_stmt = build_gimple_modify_stmt (parm1, val);
+ if (cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Not considering %s for cloning; body is overwrittable.\n",
+ cgraph_node_name (node));
+ return false;
+ }
+ if (!ipcp_versionable_function_p (node))
+ {
+ if (dump_file)
+ fprintf (dump_file, "Not considering %s for cloning; body is not versionable.\n",
+ cgraph_node_name (node));
+ return false;
+ }
+ for (e = node->callers; e; e = e->next_caller)
+ {
+ direct_call_sum += e->count;
+ n_calls ++;
+ if (cgraph_maybe_hot_edge_p (e))
+ n_hot_calls ++;
+ }
+
+ if (!n_calls)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Not considering %s for cloning; no direct calls.\n",
+ cgraph_node_name (node));
+ return false;
+ }
+ if (node->local.inline_summary.self_size < n_calls)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Considering %s for cloning; code would shrink.\n",
+ cgraph_node_name (node));
+ return true;
+ }
+
+ if (!flag_ipa_cp_clone)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Not considering %s for cloning; -fipa-cp-clone disabled.\n",
+ cgraph_node_name (node));
+ return false;
+ }
+
+ if (!optimize_function_for_speed_p (DECL_STRUCT_FUNCTION (node->decl)))
+ {
+ if (dump_file)
+ fprintf (dump_file, "Not considering %s for cloning; optimizing it for size.\n",
+ cgraph_node_name (node));
+ return false;
+ }
- if (init_stmt)
+ /* When profile is available and function is hot, propagate into it even if
+ calls seems cold; constant propagation can improve function's speed
+ significandly. */
+ if (max_count)
+ {
+ if (direct_call_sum > node->count * 90 / 100)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Considering %s for cloning; usually called directly.\n",
+ cgraph_node_name (node));
+ return true;
+ }
+ }
+ if (!n_hot_calls)
{
- e_step = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FUNCTION (cfun));
- bsi_insert_on_edge_immediate (e_step, init_stmt);
+ if (dump_file)
+ fprintf (dump_file, "Not considering %s for cloning; no hot calls.\n",
+ cgraph_node_name (node));
+ return false;
}
+ if (dump_file)
+ fprintf (dump_file, "Considering %s for cloning.\n",
+ cgraph_node_name (node));
+ return true;
}
-/* build INTEGER_CST tree with type TREE_TYPE and
- value according to CVALUE. Return the tree. */
-static tree
-build_const_val (union parameter_info *cvalue, enum cvalue_type type,
- tree tree_type)
+/* Initialize ipcp_lattices array. The lattices corresponding to supported
+ types (integers, real types and Fortran constants defined as const_decls)
+ are initialized to IPA_TOP, the rest of them to IPA_BOTTOM. */
+static void
+ipcp_initialize_node_lattices (struct cgraph_node *node)
{
- tree const_val = NULL;
+ int i;
+ struct ipa_node_params *info = IPA_NODE_REF (node);
+ enum ipa_lattice_type type;
+
+ if (ipa_is_called_with_var_arguments (info))
+ type = IPA_BOTTOM;
+ else if (cgraph_only_called_directly_p (node))
+ type = IPA_TOP;
+ /* When cloning is allowed, we can assume that externally visible functions
+ are not called. We will compensate this by cloning later. */
+ else if (ipcp_cloning_candidate_p (node))
+ type = IPA_TOP, n_cloning_candidates ++;
+ else
+ type = IPA_BOTTOM;
- gcc_assert (ipcp_type_is_const (type));
- const_val = fold_convert (tree_type, cvalue->value);
- return const_val;
+ for (i = 0; i < ipa_get_param_count (info) ; i++)
+ ipcp_get_lattice (info, i)->type = type;
}
-/* Build the tree representing the constant and call
- constant_val_insert(). */
-static void
-ipcp_propagate_const (struct cgraph_node *mt, int param,
- union parameter_info *cvalue, enum cvalue_type type)
+/* build INTEGER_CST tree with type TREE_TYPE and value according to LAT.
+ Return the tree. */
+static tree
+build_const_val (struct ipcp_lattice *lat, tree tree_type)
{
- tree const_val;
- tree parm_tree;
+ tree val;
- if (dump_file)
- fprintf (dump_file, "propagating const to %s\n", cgraph_node_name (mt));
- parm_tree = ipa_method_get_tree (mt, param);
- const_val = build_const_val (cvalue, type, TREE_TYPE (parm_tree));
- constant_val_insert (parm_tree, const_val);
+ gcc_assert (ipcp_lat_is_const (lat));
+ val = lat->constant;
+
+ if (!useless_type_conversion_p (tree_type, TREE_TYPE (val)))
+ {
+ if (fold_convertible_p (tree_type, val))
+ return fold_build1 (NOP_EXPR, tree_type, val);
+ else
+ return fold_build1 (VIEW_CONVERT_EXPR, tree_type, val);
+ }
+ return val;
}
-/* Compute the proper scale for NODE. It is the ratio between
- the number of direct calls (represented on the incoming
- cgraph_edges) and sum of all invocations of NODE (represented
- as count in cgraph_node). */
+/* Compute the proper scale for NODE. It is the ratio between the number of
+ direct calls (represented on the incoming cgraph_edges) and sum of all
+ invocations of NODE (represented as count in cgraph_node). */
static void
-ipcp_method_compute_scale (struct cgraph_node *node)
+ipcp_compute_node_scale (struct cgraph_node *node)
{
gcov_type sum;
struct cgraph_edge *cs;
for (cs = node->callers; cs != NULL; cs = cs->next_caller)
sum += cs->count;
if (node->count == 0)
- ipcp_method_set_scale (node, 0);
+ ipcp_set_node_scale (node, 0);
else
- ipcp_method_set_scale (node, sum * REG_BR_PROB_BASE / node->count);
+ ipcp_set_node_scale (node, sum * REG_BR_PROB_BASE / node->count);
}
-/* Initialization and computation of IPCP data structures.
- It is an intraprocedural
- analysis of methods, which gathers information to be propagated
- later on. */
+/* Initialization and computation of IPCP data structures. This is the initial
+ intraprocedural analysis of functions, which gathers information to be
+ propagated later on. */
static void
ipcp_init_stage (void)
{
struct cgraph_edge *cs;
for (node = cgraph_nodes; node; node = node->next)
- {
- ipa_method_formal_compute_count (node);
- ipa_method_compute_tree_map (node);
- ipcp_method_cval_init (node);
- ipa_method_compute_modify (node);
- ipcp_method_compute_scale (node);
- }
+ if (node->analyzed)
+ ipcp_analyze_node (node);
for (node = cgraph_nodes; node; node = node->next)
{
+ if (!node->analyzed)
+ continue;
/* building jump functions */
for (cs = node->callees; cs; cs = cs->next_callee)
{
- ipa_callsite_compute_count (cs);
- if (ipa_callsite_param_count (cs)
- != ipa_method_formal_count (cs->callee))
+ /* We do not need to bother analyzing calls to unknown
+ functions unless they may become known during lto/whopr. */
+ if (!cs->callee->analyzed && !flag_lto && !flag_whopr)
+ continue;
+ ipa_count_arguments (cs);
+ if (ipa_get_cs_argument_count (IPA_EDGE_REF (cs))
+ != ipa_get_param_count (IPA_NODE_REF (cs->callee)))
{
/* Handle cases of functions with
a variable number of parameters. */
- ipa_callsite_param_count_set (cs, 0);
- ipa_method_formal_count_set (cs->callee, 0);
+ ipa_set_called_with_variable_arg (IPA_NODE_REF (cs->callee));
+ if (flag_indirect_inlining)
+ ipa_compute_jump_functions (cs);
}
else
- ipa_callsite_compute_param (cs);
+ ipa_compute_jump_functions (cs);
}
}
}
-/* Return true if there are some formal parameters whose value is TOP.
- Change their values to BOTTOM, since they weren't determined. */
+/* Return true if there are some formal parameters whose value is IPA_TOP (in
+ the whole compilation unit). Change their values to IPA_BOTTOM, since they
+ most probably get their values from outside of this compilation unit. */
static bool
-ipcp_after_propagate (void)
+ipcp_change_tops_to_bottom (void)
{
int i, count;
struct cgraph_node *node;
prop_again = false;
for (node = cgraph_nodes; node; node = node->next)
{
- count = ipa_method_formal_count (node);
+ struct ipa_node_params *info = IPA_NODE_REF (node);
+ count = ipa_get_param_count (info);
for (i = 0; i < count; i++)
- if (ipcp_cval_get_cvalue_type (ipcp_method_cval (node, i)) == TOP)
- {
- prop_again = true;
- ipcp_method_cval_set_cvalue_type (node, i, BOTTOM);
- }
+ {
+ struct ipcp_lattice *lat = ipcp_get_lattice (info, i);
+ if (lat->type == IPA_TOP)
+ {
+ prop_again = true;
+ if (dump_file)
+ {
+ fprintf (dump_file, "Forcing param ");
+ print_generic_expr (dump_file, ipa_get_param (info, i), 0);
+ fprintf (dump_file, " of node %s to bottom.\n",
+ cgraph_node_name (node));
+ }
+ lat->type = IPA_BOTTOM;
+ }
+ }
}
return prop_again;
}
-/* Interprocedural analysis. The algorithm propagates constants from
- the caller's parameters to the callee's arguments. */
+/* Interprocedural analysis. The algorithm propagates constants from the
+ caller's parameters to the callee's arguments. */
static void
ipcp_propagate_stage (void)
{
int i;
- struct ipcp_formal cval1 = { BOTTOM, {0} }, cval = { BOTTOM, {0} };
- struct ipcp_formal *cval2;
- struct cgraph_node *mt, *callee;
+ struct ipcp_lattice inc_lat = { IPA_BOTTOM, NULL };
+ struct ipcp_lattice new_lat = { IPA_BOTTOM, NULL };
+ struct ipcp_lattice *dest_lat;
struct cgraph_edge *cs;
struct ipa_jump_func *jump_func;
- enum jump_func_type type;
- union parameter_info *info_type;
- ipa_methodlist_p wl;
+ struct ipa_func_list *wl;
int count;
- /* Initialize worklist to contain all methods. */
- wl = ipa_methodlist_init ();
- while (ipa_methodlist_not_empty (wl))
+ ipa_check_create_node_params ();
+ ipa_check_create_edge_args ();
+
+ /* Initialize worklist to contain all functions. */
+ wl = ipa_init_func_list ();
+ while (wl)
{
- mt = ipa_remove_method (&wl);
- for (cs = mt->callees; cs; cs = cs->next_callee)
+ struct cgraph_node *node = ipa_pop_func_from_list (&wl);
+ struct ipa_node_params *info = IPA_NODE_REF (node);
+
+ for (cs = node->callees; cs; cs = cs->next_callee)
{
- callee = ipa_callsite_callee (cs);
- count = ipa_callsite_param_count (cs);
+ struct ipa_node_params *callee_info = IPA_NODE_REF (cs->callee);
+ struct ipa_edge_args *args = IPA_EDGE_REF (cs);
+
+ if (ipa_is_called_with_var_arguments (callee_info)
+ || !cs->callee->analyzed
+ || ipa_is_called_with_var_arguments (callee_info))
+ continue;
+
+ count = ipa_get_cs_argument_count (args);
for (i = 0; i < count; i++)
{
- jump_func = ipa_callsite_param (cs, i);
- type = get_type (jump_func);
- info_type = ipa_jf_get_info_type (jump_func);
- ipcp_cval_compute (&cval1, mt, type, info_type);
- cval2 = ipcp_method_cval (callee, i);
- ipcp_cval_meet (&cval, &cval1, cval2);
- if (ipcp_cval_changed (&cval, cval2))
+ jump_func = ipa_get_ith_jump_func (args, i);
+ ipcp_lattice_from_jfunc (info, &inc_lat, jump_func);
+ dest_lat = ipcp_get_lattice (callee_info, i);
+ ipa_lattice_meet (&new_lat, &inc_lat, dest_lat);
+ if (ipcp_lattice_changed (&new_lat, dest_lat))
{
- ipcp_method_cval_set (callee, i, &cval);
- ipa_add_method (&wl, callee);
+ dest_lat->type = new_lat.type;
+ dest_lat->constant = new_lat.constant;
+ ipa_push_func_to_list (&wl, cs->callee);
}
}
}
static void
ipcp_iterate_stage (void)
{
- ipcp_propagate_stage ();
- if (ipcp_after_propagate ())
- /* Some cvals have changed from TOP to BOTTOM.
- This change should be propagated. */
- ipcp_propagate_stage ();
-}
+ struct cgraph_node *node;
+ n_cloning_candidates = 0;
-/* Check conditions to forbid constant insertion to MT. */
-static bool
-ipcp_method_dont_insert_const (struct cgraph_node *mt)
-{
- /* ??? Handle pending sizes case. */
- if (DECL_UNINLINABLE (mt->decl))
- return true;
- return false;
-}
+ if (dump_file)
+ fprintf (dump_file, "\nIPA iterate stage:\n\n");
-/* Print ipa_jump_func data structures to F. */
-static void
-ipcp_callsite_param_print (FILE * f)
-{
- struct cgraph_node *node;
- int i, count;
- struct cgraph_edge *cs;
- struct ipa_jump_func *jump_func;
- enum jump_func_type type;
- tree info_type;
+ if (in_lto_p)
+ ipa_update_after_lto_read ();
- fprintf (f, "\nCALLSITE PARAM PRINT\n");
for (node = cgraph_nodes; node; node = node->next)
{
- for (cs = node->callees; cs; cs = cs->next_callee)
- {
- fprintf (f, "callsite %s ", cgraph_node_name (node));
- fprintf (f, "-> %s :: \n", cgraph_node_name (cs->callee));
- count = ipa_callsite_param_count (cs);
- for (i = 0; i < count; i++)
- {
- jump_func = ipa_callsite_param (cs, i);
- type = get_type (jump_func);
+ ipcp_initialize_node_lattices (node);
+ ipcp_compute_node_scale (node);
+ }
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ ipcp_print_all_lattices (dump_file);
+ ipcp_function_scale_print (dump_file);
+ }
- fprintf (f, " param %d: ", i);
- if (type == UNKNOWN_IPATYPE)
- fprintf (f, "UNKNOWN\n");
- else if (type == CONST_IPATYPE || type == CONST_IPATYPE_REF)
- {
- info_type = ipa_jf_get_info_type (jump_func)->value;
- fprintf (f, "CONST : ");
- print_generic_expr (f, info_type, 0);
- fprintf (f, "\n");
- }
- else if (type == FORMAL_IPATYPE)
- {
- fprintf (f, "FORMAL : ");
- fprintf (f, "%d\n",
- ipa_jf_get_info_type (jump_func)->formal_id);
- }
- }
- }
+ ipcp_propagate_stage ();
+ if (ipcp_change_tops_to_bottom ())
+ /* Some lattices have changed from IPA_TOP to IPA_BOTTOM.
+ This change should be propagated. */
+ {
+ gcc_assert (n_cloning_candidates);
+ ipcp_propagate_stage ();
+ }
+ if (dump_file)
+ {
+ fprintf (dump_file, "\nIPA lattices after propagation:\n");
+ ipcp_print_all_lattices (dump_file);
+ if (dump_flags & TDF_DETAILS)
+ ipcp_print_profile_data (dump_file);
}
}
+/* Check conditions to forbid constant insertion to function described by
+ NODE. */
+static inline bool
+ipcp_node_modifiable_p (struct cgraph_node *node)
+{
+ /* Once we will be able to do in-place replacement, we can be more
+ lax here. */
+ return ipcp_versionable_function_p (node);
+}
+
/* Print count scale data structures. */
static void
-ipcp_method_scale_print (FILE * f)
+ipcp_function_scale_print (FILE * f)
{
struct cgraph_node *node;
for (node = cgraph_nodes; node; node = node->next)
{
+ if (!node->analyzed)
+ continue;
fprintf (f, "printing scale for %s: ", cgraph_node_name (node));
fprintf (f, "value is " HOST_WIDE_INT_PRINT_DEC
- " \n", (HOST_WIDE_INT) ipcp_method_get_scale (node));
+ " \n", (HOST_WIDE_INT) ipcp_get_node_scale (node));
}
}
/* Print counts of all cgraph nodes. */
static void
-ipcp_profile_mt_count_print (FILE * f)
+ipcp_print_func_profile_counts (FILE * f)
{
struct cgraph_node *node;
for (node = cgraph_nodes; node; node = node->next)
{
- fprintf (f, "method %s: ", cgraph_node_name (node));
+ fprintf (f, "function %s: ", cgraph_node_name (node));
fprintf (f, "count is " HOST_WIDE_INT_PRINT_DEC
" \n", (HOST_WIDE_INT) node->count);
}
/* Print counts of all cgraph edges. */
static void
-ipcp_profile_cs_count_print (FILE * f)
+ipcp_print_call_profile_counts (FILE * f)
{
struct cgraph_node *node;
struct cgraph_edge *cs;
}
}
-/* Print all counts and probabilities of cfg edges of all methods. */
-static void
-ipcp_profile_edge_print (FILE * f)
-{
- struct cgraph_node *node;
- basic_block bb;
- edge_iterator ei;
- edge e;
-
- for (node = cgraph_nodes; node; node = node->next)
- {
- fprintf (f, "method %s: \n", cgraph_node_name (node));
- if (DECL_SAVED_TREE (node->decl))
- {
- bb =
- ENTRY_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION (node->decl));
- fprintf (f, "ENTRY: ");
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC
- " %d\n", (HOST_WIDE_INT) bb->count, bb->frequency);
-
- if (bb->succs)
- FOR_EACH_EDGE (e, ei, bb->succs)
- {
- if (e->dest ==
- EXIT_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION
- (node->decl)))
- fprintf (f, "edge ENTRY -> EXIT, Count");
- else
- fprintf (f, "edge ENTRY -> %d, Count", e->dest->index);
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC
- " Prob %d\n", (HOST_WIDE_INT) e->count,
- e->probability);
- }
- FOR_EACH_BB_FN (bb, DECL_STRUCT_FUNCTION (node->decl))
- {
- fprintf (f, "bb[%d]: ", bb->index);
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC
- " %d\n", (HOST_WIDE_INT) bb->count, bb->frequency);
- FOR_EACH_EDGE (e, ei, bb->succs)
- {
- if (e->dest ==
- EXIT_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION
- (node->decl)))
- fprintf (f, "edge %d -> EXIT, Count", e->src->index);
- else
- fprintf (f, "edge %d -> %d, Count", e->src->index,
- e->dest->index);
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC " Prob %d\n",
- (HOST_WIDE_INT) e->count, e->probability);
- }
- }
- }
- }
-}
-
-/* Print counts and frequencies for all basic blocks of all methods. */
-static void
-ipcp_profile_bb_print (FILE * f)
-{
- basic_block bb;
- struct cgraph_node *node;
-
- for (node = cgraph_nodes; node; node = node->next)
- {
- fprintf (f, "method %s: \n", cgraph_node_name (node));
- if (node->analyzed)
- {
- bb =
- ENTRY_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION (node->decl));
- fprintf (f, "ENTRY: Count");
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC
- " Frequency %d\n", (HOST_WIDE_INT) bb->count,
- bb->frequency);
-
- FOR_EACH_BB_FN (bb, DECL_STRUCT_FUNCTION (node->decl))
- {
- fprintf (f, "bb[%d]: Count", bb->index);
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC
- " Frequency %d\n", (HOST_WIDE_INT) bb->count,
- bb->frequency);
- }
- bb =
- EXIT_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION (node->decl));
- fprintf (f, "EXIT: Count");
- fprintf (f, " " HOST_WIDE_INT_PRINT_DEC
- " Frequency %d\n", (HOST_WIDE_INT) bb->count,
- bb->frequency);
-
- }
- }
-}
-
-/* Print all IPCP data structures to F. */
-static void
-ipcp_structures_print (FILE * f)
-{
- ipcp_method_cval_print (f);
- ipcp_method_scale_print (f);
- ipa_method_tree_print (f);
- ipa_method_modify_print (f);
- ipcp_callsite_param_print (f);
-}
-
-/* Print profile info for all methods. */
+/* Print profile info for all functions. */
static void
-ipcp_profile_print (FILE * f)
+ipcp_print_profile_data (FILE * f)
{
fprintf (f, "\nNODE COUNTS :\n");
- ipcp_profile_mt_count_print (f);
+ ipcp_print_func_profile_counts (f);
fprintf (f, "\nCS COUNTS stage:\n");
- ipcp_profile_cs_count_print (f);
- fprintf (f, "\nBB COUNTS and FREQUENCIES :\n");
- ipcp_profile_bb_print (f);
- fprintf (f, "\nCFG EDGES COUNTS and PROBABILITIES :\n");
- ipcp_profile_edge_print (f);
+ ipcp_print_call_profile_counts (f);
}
-/* Build and initialize ipa_replace_map struct
- according to TYPE. This struct is read by versioning, which
- operates according to the flags sent. PARM_TREE is the
- formal's tree found to be constant. CVALUE represents the constant. */
+/* Build and initialize ipa_replace_map struct according to LAT. This struct is
+ processed by versioning, which operates according to the flags set.
+ PARM_TREE is the formal parameter found to be constant. LAT represents the
+ constant. */
static struct ipa_replace_map *
-ipcp_replace_map_create (struct function *func, enum cvalue_type type,
- tree parm_tree, union parameter_info *cvalue)
+ipcp_create_replace_map (tree parm_tree, struct ipcp_lattice *lat)
{
struct ipa_replace_map *replace_map;
tree const_val;
- replace_map = XCNEW (struct ipa_replace_map);
- gcc_assert (ipcp_type_is_const (type));
- if (type != CONST_VALUE_REF
- && is_gimple_reg (parm_tree) && gimple_default_def (func, parm_tree)
- && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_default_def (func, parm_tree)))
- {
- if (dump_file)
- fprintf (dump_file, "replacing param with const\n");
- const_val = build_const_val (cvalue, type, TREE_TYPE (parm_tree));
- replace_map->old_tree =gimple_default_def (func, parm_tree);
- replace_map->new_tree = const_val;
- replace_map->replace_p = true;
- replace_map->ref_p = false;
- }
- else
+ replace_map = GGC_NEW (struct ipa_replace_map);
+ const_val = build_const_val (lat, TREE_TYPE (parm_tree));
+ if (dump_file)
{
- replace_map->old_tree = NULL;
- replace_map->new_tree = NULL;
- replace_map->replace_p = false;
- replace_map->ref_p = false;
+ fprintf (dump_file, " replacing param ");
+ print_generic_expr (dump_file, parm_tree, 0);
+ fprintf (dump_file, " with const ");
+ print_generic_expr (dump_file, const_val, 0);
+ fprintf (dump_file, "\n");
}
+ replace_map->old_tree = parm_tree;
+ replace_map->new_tree = const_val;
+ replace_map->replace_p = true;
+ replace_map->ref_p = false;
return replace_map;
}
-/* Return true if this callsite should be redirected to
- the orig callee (instead of the cloned one). */
+/* Return true if this callsite should be redirected to the original callee
+ (instead of the cloned one). */
static bool
-ipcp_redirect (struct cgraph_edge *cs)
+ipcp_need_redirect_p (struct cgraph_edge *cs)
{
- struct cgraph_node *caller, *callee, *orig_callee;
+ struct ipa_node_params *orig_callee_info;
int i, count;
struct ipa_jump_func *jump_func;
- enum jump_func_type type;
- enum cvalue_type cval_type;
+ struct cgraph_node *node = cs->callee, *orig;
+
+ if (!n_cloning_candidates)
+ return false;
+
+ if ((orig = ipcp_get_orig_node (node)) != NULL)
+ node = orig;
+ if (ipcp_get_orig_node (cs->caller))
+ return false;
- caller = cs->caller;
- callee = cs->callee;
- orig_callee = ipcp_method_orig_node (callee);
- count = ipa_method_formal_count (orig_callee);
+ orig_callee_info = IPA_NODE_REF (node);
+ count = ipa_get_param_count (orig_callee_info);
for (i = 0; i < count; i++)
{
- cval_type =
- ipcp_cval_get_cvalue_type (ipcp_method_cval (orig_callee, i));
- if (ipcp_type_is_const (cval_type))
+ struct ipcp_lattice *lat = ipcp_get_lattice (orig_callee_info, i);
+ if (ipcp_lat_is_const (lat))
{
- jump_func = ipa_callsite_param (cs, i);
- type = get_type (jump_func);
- if (type != CONST_IPATYPE && type != CONST_IPATYPE_REF)
+ jump_func = ipa_get_ith_jump_func (IPA_EDGE_REF (cs), i);
+ if (jump_func->type != IPA_JF_CONST)
return true;
}
}
return false;
}
-/* Fix the callsites and the callgraph after function cloning was done. */
+/* Fix the callsites and the call graph after function cloning was done. */
static void
ipcp_update_callgraph (void)
{
- struct cgraph_node *node, *orig_callee;
- struct cgraph_edge *cs;
+ struct cgraph_node *node;
for (node = cgraph_nodes; node; node = node->next)
- {
- /* want to fix only original nodes */
- if (ipcp_method_is_cloned (node))
- continue;
- for (cs = node->callees; cs; cs = cs->next_callee)
- if (ipcp_method_is_cloned (cs->callee))
+ if (node->analyzed && ipcp_node_is_clone (node))
+ {
+ bitmap args_to_skip = BITMAP_ALLOC (NULL);
+ struct cgraph_node *orig_node = ipcp_get_orig_node (node);
+ struct ipa_node_params *info = IPA_NODE_REF (orig_node);
+ int i, count = ipa_get_param_count (info);
+ struct cgraph_edge *cs, *next;
+
+ for (i = 0; i < count; i++)
{
- /* Callee is a cloned node */
- orig_callee = ipcp_method_orig_node (cs->callee);
- if (ipcp_redirect (cs))
+ struct ipcp_lattice *lat = ipcp_get_lattice (info, i);
+ tree parm_tree = ipa_get_param (info, i);
+
+ /* We can proactively remove obviously unused arguments. */
+ if (is_gimple_reg (parm_tree)
+ && !gimple_default_def (DECL_STRUCT_FUNCTION (orig_node->decl),
+ parm_tree))
{
- cgraph_redirect_edge_callee (cs, orig_callee);
- TREE_OPERAND (CALL_EXPR_FN (get_call_expr_in (cs->call_stmt)),
- 0) =
- orig_callee->decl;
+ bitmap_set_bit (args_to_skip, i);
+ continue;
}
- }
- }
-}
-/* Update all cfg basic blocks in NODE according to SCALE. */
-static void
-ipcp_update_bb_counts (struct cgraph_node *node, gcov_type scale)
-{
- basic_block bb;
-
- FOR_ALL_BB_FN (bb, DECL_STRUCT_FUNCTION (node->decl))
- bb->count = bb->count * scale / REG_BR_PROB_BASE;
-}
-
-/* Update all cfg edges in NODE according to SCALE. */
-static void
-ipcp_update_edges_counts (struct cgraph_node *node, gcov_type scale)
-{
- basic_block bb;
- edge_iterator ei;
- edge e;
-
- FOR_ALL_BB_FN (bb, DECL_STRUCT_FUNCTION (node->decl))
- FOR_EACH_EDGE (e, ei, bb->succs)
- e->count = e->count * scale / REG_BR_PROB_BASE;
+ if (lat->type == IPA_CONST_VALUE)
+ bitmap_set_bit (args_to_skip, i);
+ }
+ for (cs = node->callers; cs; cs = next)
+ {
+ next = cs->next_caller;
+ if (!ipcp_node_is_clone (cs->caller) && ipcp_need_redirect_p (cs))
+ cgraph_redirect_edge_callee (cs, orig_node);
+ }
+ }
}
-/* Update profiling info for versioned methods and the
- methods they were versioned from. */
+/* Update profiling info for versioned functions and the functions they were
+ versioned from. */
static void
ipcp_update_profiling (void)
{
for (node = cgraph_nodes; node; node = node->next)
{
- if (ipcp_method_is_cloned (node))
+ if (ipcp_node_is_clone (node))
{
- orig_node = ipcp_method_orig_node (node);
- scale = ipcp_method_get_scale (orig_node);
+ orig_node = ipcp_get_orig_node (node);
+ scale = ipcp_get_node_scale (orig_node);
node->count = orig_node->count * scale / REG_BR_PROB_BASE;
scale_complement = REG_BR_PROB_BASE - scale;
orig_node->count =
cs->count = cs->count * scale / REG_BR_PROB_BASE;
for (cs = orig_node->callees; cs; cs = cs->next_callee)
cs->count = cs->count * scale_complement / REG_BR_PROB_BASE;
- ipcp_update_bb_counts (node, scale);
- ipcp_update_bb_counts (orig_node, scale_complement);
- ipcp_update_edges_counts (node, scale);
- ipcp_update_edges_counts (orig_node, scale_complement);
}
}
}
+/* If NODE was cloned, how much would program grow? */
+static long
+ipcp_estimate_growth (struct cgraph_node *node)
+{
+ struct cgraph_edge *cs;
+ int redirectable_node_callers = 0;
+ int removable_args = 0;
+ bool need_original = !cgraph_only_called_directly_p (node);
+ struct ipa_node_params *info;
+ int i, count;
+ int growth;
+
+ for (cs = node->callers; cs != NULL; cs = cs->next_caller)
+ if (cs->caller == node || !ipcp_need_redirect_p (cs))
+ redirectable_node_callers++;
+ else
+ need_original = true;
+
+ /* If we will be able to fully replace orignal node, we never increase
+ program size. */
+ if (!need_original)
+ return 0;
+
+ info = IPA_NODE_REF (node);
+ count = ipa_get_param_count (info);
+ for (i = 0; i < count; i++)
+ {
+ struct ipcp_lattice *lat = ipcp_get_lattice (info, i);
+ tree parm_tree = ipa_get_param (info, i);
+
+ /* We can proactively remove obviously unused arguments. */
+ if (is_gimple_reg (parm_tree)
+ && !gimple_default_def (DECL_STRUCT_FUNCTION (node->decl),
+ parm_tree))
+ removable_args++;
+
+ if (lat->type == IPA_CONST_VALUE)
+ removable_args++;
+ }
+
+ /* We make just very simple estimate of savings for removal of operand from
+ call site. Precise cost is dificult to get, as our size metric counts
+ constants and moves as free. Generally we are looking for cases that
+ small function is called very many times. */
+ growth = node->local.inline_summary.self_size
+ - removable_args * redirectable_node_callers;
+ if (growth < 0)
+ return 0;
+ return growth;
+}
+
+
+/* Estimate cost of cloning NODE. */
+static long
+ipcp_estimate_cloning_cost (struct cgraph_node *node)
+{
+ int freq_sum = 1;
+ gcov_type count_sum = 1;
+ struct cgraph_edge *e;
+ int cost;
+
+ cost = ipcp_estimate_growth (node) * 1000;
+ if (!cost)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Versioning of %s will save code size\n",
+ cgraph_node_name (node));
+ return 0;
+ }
+
+ for (e = node->callers; e; e = e->next_caller)
+ if (!bitmap_bit_p (dead_nodes, e->caller->uid)
+ && !ipcp_need_redirect_p (e))
+ {
+ count_sum += e->count;
+ freq_sum += e->frequency + 1;
+ }
+
+ if (max_count)
+ cost /= count_sum * 1000 / max_count + 1;
+ else
+ cost /= freq_sum * 1000 / REG_BR_PROB_BASE + 1;
+ if (dump_file)
+ fprintf (dump_file, "Cost of versioning %s is %i, (size: %i, freq: %i)\n",
+ cgraph_node_name (node), cost, node->local.inline_summary.self_size,
+ freq_sum);
+ return cost + 1;
+}
+
+/* Return number of live constant parameters. */
+static int
+ipcp_const_param_count (struct cgraph_node *node)
+{
+ int const_param = 0;
+ struct ipa_node_params *info = IPA_NODE_REF (node);
+ int count = ipa_get_param_count (info);
+ int i;
+
+ for (i = 0; i < count; i++)
+ {
+ struct ipcp_lattice *lat = ipcp_get_lattice (info, i);
+ tree parm_tree = ipa_get_param (info, i);
+ if (ipcp_lat_is_insertable (lat)
+ /* Do not count obviously unused arguments. */
+ && (!is_gimple_reg (parm_tree)
+ || gimple_default_def (DECL_STRUCT_FUNCTION (node->decl),
+ parm_tree)))
+ const_param++;
+ }
+ return const_param;
+}
+
/* Propagate the constant parameters found by ipcp_iterate_stage()
to the function's code. */
static void
ipcp_insert_stage (void)
{
struct cgraph_node *node, *node1 = NULL;
- int i, const_param;
- union parameter_info *cvalue;
+ int i;
VEC (cgraph_edge_p, heap) * redirect_callers;
- varray_type replace_trees;
- struct cgraph_edge *cs;
+ VEC (ipa_replace_map_p,gc)* replace_trees;
int node_callers, count;
tree parm_tree;
- enum cvalue_type type;
struct ipa_replace_map *replace_param;
+ fibheap_t heap;
+ long overall_size = 0, new_size = 0;
+ long max_new_size;
+
+ ipa_check_create_node_params ();
+ ipa_check_create_edge_args ();
+ if (dump_file)
+ fprintf (dump_file, "\nIPA insert stage:\n\n");
+ dead_nodes = BITMAP_ALLOC (NULL);
+
+ for (node = cgraph_nodes; node; node = node->next)
+ if (node->analyzed)
+ {
+ if (node->count > max_count)
+ max_count = node->count;
+ overall_size += node->local.inline_summary.self_size;
+ }
+
+ max_new_size = overall_size;
+ if (max_new_size < PARAM_VALUE (PARAM_LARGE_UNIT_INSNS))
+ max_new_size = PARAM_VALUE (PARAM_LARGE_UNIT_INSNS);
+ max_new_size = max_new_size * PARAM_VALUE (PARAM_IPCP_UNIT_GROWTH) / 100 + 1;
+
+ /* First collect all functions we proved to have constant arguments to heap. */
+ heap = fibheap_new ();
for (node = cgraph_nodes; node; node = node->next)
{
- /* Propagation of the constant is forbidden in
- certain conditions. */
- if (!node->analyzed || ipcp_method_dont_insert_const (node))
+ struct ipa_node_params *info;
+ /* Propagation of the constant is forbidden in certain conditions. */
+ if (!node->analyzed || !ipcp_node_modifiable_p (node))
+ continue;
+ info = IPA_NODE_REF (node);
+ if (ipa_is_called_with_var_arguments (info))
continue;
- const_param = 0;
- count = ipa_method_formal_count (node);
- for (i = 0; i < count; i++)
+ if (ipcp_const_param_count (node))
+ node->aux = fibheap_insert (heap, ipcp_estimate_cloning_cost (node), node);
+ }
+
+ /* Now clone in priority order until code size growth limits are met or
+ heap is emptied. */
+ while (!fibheap_empty (heap))
+ {
+ struct ipa_node_params *info;
+ int growth = 0;
+ bitmap args_to_skip;
+ struct cgraph_edge *cs;
+
+ node = (struct cgraph_node *)fibheap_extract_min (heap);
+ node->aux = NULL;
+ if (dump_file)
+ fprintf (dump_file, "considering function %s\n",
+ cgraph_node_name (node));
+
+ growth = ipcp_estimate_growth (node);
+
+ if (new_size + growth > max_new_size)
+ break;
+ if (growth
+ && optimize_function_for_size_p (DECL_STRUCT_FUNCTION (node->decl)))
{
- type = ipcp_cval_get_cvalue_type (ipcp_method_cval (node, i));
- if (ipcp_type_is_const (type))
- const_param++;
+ if (dump_file)
+ fprintf (dump_file, "Not versioning, cold code would grow");
+ continue;
}
- if (const_param == 0)
- continue;
- VARRAY_GENERIC_PTR_INIT (replace_trees, const_param, "replace_trees");
+
+ new_size += growth;
+
+ /* Look if original function becomes dead after clonning. */
+ for (cs = node->callers; cs != NULL; cs = cs->next_caller)
+ if (cs->caller == node || ipcp_need_redirect_p (cs))
+ break;
+ if (!cs && cgraph_only_called_directly_p (node))
+ bitmap_set_bit (dead_nodes, node->uid);
+
+ info = IPA_NODE_REF (node);
+ count = ipa_get_param_count (info);
+
+ replace_trees = VEC_alloc (ipa_replace_map_p, gc, 1);
+ args_to_skip = BITMAP_GGC_ALLOC ();
for (i = 0; i < count; i++)
{
- type = ipcp_cval_get_cvalue_type (ipcp_method_cval (node, i));
- if (ipcp_type_is_const (type))
+ struct ipcp_lattice *lat = ipcp_get_lattice (info, i);
+ parm_tree = ipa_get_param (info, i);
+
+ /* We can proactively remove obviously unused arguments. */
+ if (is_gimple_reg (parm_tree)
+ && !gimple_default_def (DECL_STRUCT_FUNCTION (node->decl),
+ parm_tree))
+ {
+ bitmap_set_bit (args_to_skip, i);
+ continue;
+ }
+
+ if (lat->type == IPA_CONST_VALUE)
{
- cvalue = ipcp_cval_get_cvalue (ipcp_method_cval (node, i));
- parm_tree = ipa_method_get_tree (node, i);
replace_param =
- ipcp_replace_map_create (DECL_STRUCT_FUNCTION (node->decl),
- type, parm_tree, cvalue);
- VARRAY_PUSH_GENERIC_PTR (replace_trees, replace_param);
+ ipcp_create_replace_map (parm_tree, lat);
+ VEC_safe_push (ipa_replace_map_p, gc, replace_trees, replace_param);
+ bitmap_set_bit (args_to_skip, i);
}
}
+
/* Compute how many callers node has. */
node_callers = 0;
for (cs = node->callers; cs != NULL; cs = cs->next_caller)
redirect_callers = VEC_alloc (cgraph_edge_p, heap, node_callers);
for (cs = node->callers; cs != NULL; cs = cs->next_caller)
VEC_quick_push (cgraph_edge_p, redirect_callers, cs);
+
/* Redirecting all the callers of the node to the
new versioned node. */
node1 =
- cgraph_function_versioning (node, redirect_callers, replace_trees);
+ cgraph_create_virtual_clone (node, redirect_callers, replace_trees,
+ args_to_skip);
+ args_to_skip = NULL;
VEC_free (cgraph_edge_p, heap, redirect_callers);
- VARRAY_CLEAR (replace_trees);
+ replace_trees = NULL;
+
if (node1 == NULL)
continue;
if (dump_file)
- fprintf (dump_file, "versioned function %s\n",
- cgraph_node_name (node));
- ipcp_cloned_create (node, node1);
- if (const_param > 0)
- {
- push_cfun (DECL_STRUCT_FUNCTION (node1->decl));
- tree_register_cfg_hooks ();
- current_function_decl = node1->decl;
+ fprintf (dump_file, "versioned function %s with growth %i, overall %i\n",
+ cgraph_node_name (node), (int)growth, (int)new_size);
+ ipcp_init_cloned_node (node, node1);
+
+ /* TODO: We can use indirect inlning info to produce new calls. */
- for (i = 0; i < count; i++)
- {
- type = ipcp_cval_get_cvalue_type (ipcp_method_cval (node, i));
- if (ipcp_type_is_const (type))
- {
- cvalue = ipcp_cval_get_cvalue (ipcp_method_cval (node, i));
- parm_tree = ipa_method_get_tree (node, i);
- if (type != CONST_VALUE_REF && !is_gimple_reg (parm_tree))
- ipcp_propagate_const (node1, i, cvalue, type);
- }
- }
- if (gimple_in_ssa_p (cfun))
- {
- update_ssa (TODO_update_ssa);
-#ifdef ENABLE_CHECKING
- verify_ssa (true);
-#endif
- }
- free_dominance_info (CDI_DOMINATORS);
- free_dominance_info (CDI_POST_DOMINATORS);
- pop_cfun ();
- current_function_decl = NULL;
- }
if (dump_file)
dump_function_to_file (node1->decl, dump_file, dump_flags);
+
+ for (cs = node->callees; cs; cs = cs->next_callee)
+ if (cs->callee->aux)
+ {
+ fibheap_delete_node (heap, (fibnode_t) cs->callee->aux);
+ cs->callee->aux = fibheap_insert (heap,
+ ipcp_estimate_cloning_cost (cs->callee),
+ cs->callee);
+ }
}
+
+ while (!fibheap_empty (heap))
+ {
+ if (dump_file)
+ fprintf (dump_file, "skipping function %s\n",
+ cgraph_node_name (node));
+ node = (struct cgraph_node *) fibheap_extract_min (heap);
+ node->aux = NULL;
+ }
+ fibheap_delete (heap);
+ BITMAP_FREE (dead_nodes);
ipcp_update_callgraph ();
ipcp_update_profiling ();
}
static unsigned int
ipcp_driver (void)
{
- if (dump_file)
- fprintf (dump_file, "\nIPA constant propagation start:\n");
- ipa_nodes_create ();
- ipa_edges_create ();
- /* 1. Call the init stage to initialize
- the ipa_node and ipa_edge structures. */
- ipcp_init_stage ();
+ cgraph_remove_unreachable_nodes (true,dump_file);
if (dump_file)
{
fprintf (dump_file, "\nIPA structures before propagation:\n");
- ipcp_structures_print (dump_file);
+ if (dump_flags & TDF_DETAILS)
+ ipa_print_all_params (dump_file);
+ ipa_print_all_jump_functions (dump_file);
}
/* 2. Do the interprocedural propagation. */
ipcp_iterate_stage ();
- if (dump_file)
- {
- fprintf (dump_file, "\nIPA structures after propagation:\n");
- ipcp_structures_print (dump_file);
- fprintf (dump_file, "\nProfiling info before insert stage:\n");
- ipcp_profile_print (dump_file);
- }
/* 3. Insert the constants found to the functions. */
ipcp_insert_stage ();
- if (dump_file)
+ if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "\nProfiling info after insert stage:\n");
- ipcp_profile_print (dump_file);
+ ipcp_print_profile_data (dump_file);
}
/* Free all IPCP structures. */
- ipa_free ();
- ipa_nodes_free ();
- ipa_edges_free ();
+ free_all_ipa_structures_after_ipa_cp ();
if (dump_file)
fprintf (dump_file, "\nIPA constant propagation end\n");
- cgraph_remove_unreachable_nodes (true, NULL);
return 0;
}
+/* Note function body size. */
+static void
+ipcp_generate_summary (void)
+{
+ if (dump_file)
+ fprintf (dump_file, "\nIPA constant propagation start:\n");
+ ipa_check_create_node_params ();
+ ipa_check_create_edge_args ();
+ ipa_register_cgraph_hooks ();
+ /* 1. Call the init stage to initialize
+ the ipa_node_params and ipa_edge_args structures. */
+ ipcp_init_stage ();
+}
+
+/* Write ipcp summary for nodes in SET. */
+static void
+ipcp_write_summary (cgraph_node_set set)
+{
+ ipa_prop_write_jump_functions (set);
+}
+
+/* Read ipcp summary. */
+static void
+ipcp_read_summary (void)
+{
+ ipa_prop_read_jump_functions ();
+}
+
/* Gate for IPCP optimization. */
static bool
cgraph_gate_cp (void)
return flag_ipa_cp;
}
-struct tree_opt_pass pass_ipa_cp = {
+struct ipa_opt_pass_d pass_ipa_cp =
+{
+ {
+ IPA_PASS,
"cp", /* name */
cgraph_gate_cp, /* gate */
ipcp_driver, /* execute */
0, /* static_pass_number */
TV_IPA_CONSTANT_PROP, /* tv_id */
0, /* properties_required */
- PROP_trees, /* properties_provided */
+ 0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_cgraph | TODO_dump_func, /* todo_flags_finish */
- 0 /* letter */
+ TODO_dump_cgraph | TODO_dump_func |
+ TODO_remove_functions /* todo_flags_finish */
+ },
+ ipcp_generate_summary, /* generate_summary */
+ ipcp_write_summary, /* write_summary */
+ ipcp_read_summary, /* read_summary */
+ NULL, /* function_read_summary */
+ 0, /* TODOs */
+ NULL, /* function_transform */
+ NULL, /* variable_transform */
};
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