/* SSA Dominator optimizations for trees
- Copyright (C) 2001-2013 Free Software Foundation, Inc.
+ Copyright (C) 2001-2014 Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
This file is part of GCC.
#include "stor-layout.h"
#include "flags.h"
#include "tm_p.h"
+#include "predict.h"
+#include "vec.h"
+#include "hashtab.h"
+#include "hash-set.h"
+#include "machmode.h"
+#include "hard-reg-set.h"
+#include "input.h"
+#include "function.h"
+#include "dominance.h"
+#include "cfg.h"
+#include "cfganal.h"
#include "basic-block.h"
#include "cfgloop.h"
-#include "function.h"
+#include "inchash.h"
#include "gimple-pretty-print.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "params.h"
#include "tree-ssa-threadedge.h"
#include "tree-ssa-dom.h"
+#include "inchash.h"
/* This file implements optimizations on the dominator tree. */
struct expr_elt_hasher
{
- typedef expr_hash_elt value_type;
- typedef expr_hash_elt compare_type;
- static inline hashval_t hash (const value_type *);
- static inline bool equal (const value_type *, const compare_type *);
- static inline void remove (value_type *);
+ typedef expr_hash_elt *value_type;
+ typedef expr_hash_elt *compare_type;
+ typedef int store_values_directly;
+ static inline hashval_t hash (const value_type &);
+ static inline bool equal (const value_type &, const compare_type &);
+ static inline void remove (value_type &);
};
inline hashval_t
-expr_elt_hasher::hash (const value_type *p)
+expr_elt_hasher::hash (const value_type &p)
{
return p->hash;
}
inline bool
-expr_elt_hasher::equal (const value_type *p1, const compare_type *p2)
+expr_elt_hasher::equal (const value_type &p1, const compare_type &p2)
{
gimple stmt1 = p1->stmt;
const struct hashable_expr *expr1 = &p1->expr;
/* Delete an expr_hash_elt and reclaim its storage. */
inline void
-expr_elt_hasher::remove (value_type *element)
+expr_elt_hasher::remove (value_type &element)
{
free_expr_hash_elt (element);
}
global redundancy elimination). Similarly as we pass through conditionals
we record the conditional itself as having either a true or false value
in this table. */
-static hash_table <expr_elt_hasher> avail_exprs;
+static hash_table<expr_elt_hasher> *avail_exprs;
/* Stack of dest,src pairs that need to be restored during finalization.
static void optimize_stmt (basic_block, gimple_stmt_iterator);
static tree lookup_avail_expr (gimple, bool);
static hashval_t avail_expr_hash (const void *);
-static void htab_statistics (FILE *, hash_table <expr_elt_hasher>);
+static void htab_statistics (FILE *,
+ const hash_table<expr_elt_hasher> &);
static void record_cond (cond_equivalence *);
static void record_const_or_copy (tree, tree);
static void record_equality (tree, tree);
case GIMPLE_UNARY_RHS:
expr->kind = EXPR_UNARY;
expr->type = TREE_TYPE (gimple_assign_lhs (stmt));
+ if (CONVERT_EXPR_CODE_P (subcode))
+ subcode = NOP_EXPR;
expr->ops.unary.op = subcode;
expr->ops.unary.opnd = gimple_assign_rhs1 (stmt);
break;
expr1->ops.call.args[i], 0))
return false;
+ if (stmt_could_throw_p (expr0->ops.call.fn_from))
+ {
+ int lp0 = lookup_stmt_eh_lp (expr0->ops.call.fn_from);
+ int lp1 = lookup_stmt_eh_lp (expr1->ops.call.fn_from);
+ if ((lp0 > 0 || lp1 > 0) && lp0 != lp1)
+ return false;
+ }
+
return true;
}
}
/* Generate a hash value for a pair of expressions. This can be used
- iteratively by passing a previous result as the VAL argument.
+ iteratively by passing a previous result in HSTATE.
The same hash value is always returned for a given pair of expressions,
regardless of the order in which they are presented. This is useful in
hashing the operands of commutative functions. */
-static hashval_t
-iterative_hash_exprs_commutative (const_tree t1,
- const_tree t2, hashval_t val)
+namespace inchash
{
- hashval_t one = iterative_hash_expr (t1, 0);
- hashval_t two = iterative_hash_expr (t2, 0);
- hashval_t t;
- if (one > two)
- t = one, one = two, two = t;
- val = iterative_hash_hashval_t (one, val);
- val = iterative_hash_hashval_t (two, val);
+static void
+add_expr_commutative (const_tree t1, const_tree t2, hash &hstate)
+{
+ hash one, two;
- return val;
+ inchash::add_expr (t1, one);
+ inchash::add_expr (t2, two);
+ hstate.add_commutative (one, two);
}
/* Compute a hash value for a hashable_expr value EXPR and a
previously accumulated hash value VAL. If two hashable_expr
values compare equal with hashable_expr_equal_p, they must
hash to the same value, given an identical value of VAL.
- The logic is intended to follow iterative_hash_expr in tree.c. */
+ The logic is intended to follow inchash::add_expr in tree.c. */
-static hashval_t
-iterative_hash_hashable_expr (const struct hashable_expr *expr, hashval_t val)
+static void
+add_hashable_expr (const struct hashable_expr *expr, hash &hstate)
{
switch (expr->kind)
{
case EXPR_SINGLE:
- val = iterative_hash_expr (expr->ops.single.rhs, val);
+ inchash::add_expr (expr->ops.single.rhs, hstate);
break;
case EXPR_UNARY:
- val = iterative_hash_object (expr->ops.unary.op, val);
+ hstate.add_object (expr->ops.unary.op);
/* Make sure to include signedness in the hash computation.
Don't hash the type, that can lead to having nodes which
have different hash codes. */
if (CONVERT_EXPR_CODE_P (expr->ops.unary.op)
|| expr->ops.unary.op == NON_LVALUE_EXPR)
- val += TYPE_UNSIGNED (expr->type);
+ hstate.add_int (TYPE_UNSIGNED (expr->type));
- val = iterative_hash_expr (expr->ops.unary.opnd, val);
+ inchash::add_expr (expr->ops.unary.opnd, hstate);
break;
case EXPR_BINARY:
- val = iterative_hash_object (expr->ops.binary.op, val);
+ hstate.add_object (expr->ops.binary.op);
if (commutative_tree_code (expr->ops.binary.op))
- val = iterative_hash_exprs_commutative (expr->ops.binary.opnd0,
- expr->ops.binary.opnd1, val);
+ inchash::add_expr_commutative (expr->ops.binary.opnd0,
+ expr->ops.binary.opnd1, hstate);
else
{
- val = iterative_hash_expr (expr->ops.binary.opnd0, val);
- val = iterative_hash_expr (expr->ops.binary.opnd1, val);
+ inchash::add_expr (expr->ops.binary.opnd0, hstate);
+ inchash::add_expr (expr->ops.binary.opnd1, hstate);
}
break;
case EXPR_TERNARY:
- val = iterative_hash_object (expr->ops.ternary.op, val);
+ hstate.add_object (expr->ops.ternary.op);
if (commutative_ternary_tree_code (expr->ops.ternary.op))
- val = iterative_hash_exprs_commutative (expr->ops.ternary.opnd0,
- expr->ops.ternary.opnd1, val);
+ inchash::add_expr_commutative (expr->ops.ternary.opnd0,
+ expr->ops.ternary.opnd1, hstate);
else
{
- val = iterative_hash_expr (expr->ops.ternary.opnd0, val);
- val = iterative_hash_expr (expr->ops.ternary.opnd1, val);
+ inchash::add_expr (expr->ops.ternary.opnd0, hstate);
+ inchash::add_expr (expr->ops.ternary.opnd1, hstate);
}
- val = iterative_hash_expr (expr->ops.ternary.opnd2, val);
+ inchash::add_expr (expr->ops.ternary.opnd2, hstate);
break;
case EXPR_CALL:
enum tree_code code = CALL_EXPR;
gimple fn_from;
- val = iterative_hash_object (code, val);
+ hstate.add_object (code);
fn_from = expr->ops.call.fn_from;
if (gimple_call_internal_p (fn_from))
- val = iterative_hash_hashval_t
- ((hashval_t) gimple_call_internal_fn (fn_from), val);
+ hstate.merge_hash ((hashval_t) gimple_call_internal_fn (fn_from));
else
- val = iterative_hash_expr (gimple_call_fn (fn_from), val);
+ inchash::add_expr (gimple_call_fn (fn_from), hstate);
for (i = 0; i < expr->ops.call.nargs; i++)
- val = iterative_hash_expr (expr->ops.call.args[i], val);
+ inchash::add_expr (expr->ops.call.args[i], hstate);
}
break;
size_t i;
for (i = 0; i < expr->ops.phi.nargs; i++)
- val = iterative_hash_expr (expr->ops.phi.args[i], val);
+ inchash::add_expr (expr->ops.phi.args[i], hstate);
}
break;
default:
gcc_unreachable ();
}
+}
- return val;
}
/* Print a diagnostic dump of an expression hash table entry. */
edge_iterator ei;
edge e;
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
FOR_EACH_EDGE (e, ei, bb->preds)
{
every new symbol exposed, its corresponding bit will be set in
VARS_TO_RENAME. */
-static unsigned int
-tree_ssa_dominator_optimize (void)
+namespace {
+
+const pass_data pass_data_dominator =
+{
+ GIMPLE_PASS, /* type */
+ "dom", /* name */
+ OPTGROUP_NONE, /* optinfo_flags */
+ TV_TREE_SSA_DOMINATOR_OPTS, /* tv_id */
+ ( PROP_cfg | PROP_ssa ), /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ ( TODO_cleanup_cfg | TODO_update_ssa ), /* todo_flags_finish */
+};
+
+class pass_dominator : public gimple_opt_pass
+{
+public:
+ pass_dominator (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_dominator, ctxt)
+ {}
+
+ /* opt_pass methods: */
+ opt_pass * clone () { return new pass_dominator (m_ctxt); }
+ virtual bool gate (function *) { return flag_tree_dom != 0; }
+ virtual unsigned int execute (function *);
+
+}; // class pass_dominator
+
+unsigned int
+pass_dominator::execute (function *fun)
{
memset (&opt_stats, 0, sizeof (opt_stats));
/* Create our hash tables. */
- avail_exprs.create (1024);
+ avail_exprs = new hash_table<expr_elt_hasher> (1024);
avail_exprs_stack.create (20);
const_and_copies_stack.create (20);
need_eh_cleanup = BITMAP_ALLOC (NULL);
/* We need to know loop structures in order to avoid destroying them
in jump threading. Note that we still can e.g. thread through loop
headers to an exit edge, or through loop header to the loop body, assuming
- that we update the loop info. */
- loop_optimizer_init (LOOPS_HAVE_SIMPLE_LATCHES);
+ that we update the loop info.
+
+ TODO: We don't need to set LOOPS_HAVE_PREHEADERS generally, but due
+ to several overly conservative bail-outs in jump threading, case
+ gcc.dg/tree-ssa/pr21417.c can't be threaded if loop preheader is
+ missing. We should improve jump threading in future then
+ LOOPS_HAVE_PREHEADERS won't be needed here. */
+ loop_optimizer_init (LOOPS_HAVE_PREHEADERS | LOOPS_HAVE_SIMPLE_LATCHES);
/* Initialize the value-handle array. */
threadedge_initialize_values ();
mark_dfs_back_edges ();
/* Recursively walk the dominator tree optimizing statements. */
- dom_opt_dom_walker (CDI_DOMINATORS).walk (cfun->cfg->x_entry_block_ptr);
+ dom_opt_dom_walker (CDI_DOMINATORS).walk (fun->cfg->x_entry_block_ptr);
{
gimple_stmt_iterator gsi;
basic_block bb;
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, fun)
{
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
update_stmt_if_modified (gsi_stmt (gsi));
iterator. */
EXECUTE_IF_SET_IN_BITMAP (need_eh_cleanup, 0, i, bi)
{
- basic_block bb = BASIC_BLOCK (i);
+ basic_block bb = BASIC_BLOCK_FOR_FN (fun, i);
if (bb == NULL)
continue;
while (single_succ_p (bb)
&& (single_succ_edge (bb)->flags & EDGE_EH) == 0)
bb = single_succ (bb);
- if (bb == EXIT_BLOCK_PTR_FOR_FN (cfun))
+ if (bb == EXIT_BLOCK_PTR_FOR_FN (fun))
continue;
if ((unsigned) bb->index != i)
bitmap_set_bit (need_eh_cleanup, bb->index);
bitmap_clear (need_eh_cleanup);
}
- statistics_counter_event (cfun, "Redundant expressions eliminated",
+ statistics_counter_event (fun, "Redundant expressions eliminated",
opt_stats.num_re);
- statistics_counter_event (cfun, "Constants propagated",
+ statistics_counter_event (fun, "Constants propagated",
opt_stats.num_const_prop);
- statistics_counter_event (cfun, "Copies propagated",
+ statistics_counter_event (fun, "Copies propagated",
opt_stats.num_copy_prop);
/* Debugging dumps. */
loop_optimizer_finalize ();
/* Delete our main hashtable. */
- avail_exprs.dispose ();
+ delete avail_exprs;
+ avail_exprs = NULL;
/* Free asserted bitmaps and stacks. */
BITMAP_FREE (need_eh_cleanup);
return 0;
}
-static bool
-gate_dominator (void)
-{
- return flag_tree_dom != 0;
-}
-
-namespace {
-
-const pass_data pass_data_dominator =
-{
- GIMPLE_PASS, /* type */
- "dom", /* name */
- OPTGROUP_NONE, /* optinfo_flags */
- true, /* has_gate */
- true, /* has_execute */
- TV_TREE_SSA_DOMINATOR_OPTS, /* tv_id */
- ( PROP_cfg | PROP_ssa ), /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- ( TODO_cleanup_cfg | TODO_update_ssa
- | TODO_verify_ssa
- | TODO_verify_flow ), /* todo_flags_finish */
-};
-
-class pass_dominator : public gimple_opt_pass
-{
-public:
- pass_dominator (gcc::context *ctxt)
- : gimple_opt_pass (pass_data_dominator, ctxt)
- {}
-
- /* opt_pass methods: */
- opt_pass * clone () { return new pass_dominator (m_ctxt); }
- bool gate () { return gate_dominator (); }
- unsigned int execute () { return tree_ssa_dominator_optimize (); }
-
-}; // class pass_dominator
-
} // anon namespace
gimple_opt_pass *
print_expr_hash_elt (dump_file, victim);
}
- slot = avail_exprs.find_slot_with_hash (victim, victim->hash, NO_INSERT);
+ slot = avail_exprs->find_slot (victim, NO_INSERT);
gcc_assert (slot && *slot == victim);
- avail_exprs.clear_slot (slot);
+ avail_exprs->clear_slot (slot);
}
}
this, since this is a true assignment and not an equivalence
inferred from a comparison. All uses of this ssa name are dominated
by this assignment, so unwinding just costs time and space. */
- if (i == gimple_phi_num_args (phi) && may_propagate_copy (lhs, rhs))
+ if (i == gimple_phi_num_args (phi)
+ && may_propagate_copy (lhs, rhs))
set_ssa_name_value (lhs, rhs);
}
}
fprintf (file, "\nHash table statistics:\n");
fprintf (file, " avail_exprs: ");
- htab_statistics (file, avail_exprs);
+ htab_statistics (file, *avail_exprs);
}
/* Dump statistics for the hash table HTAB. */
static void
-htab_statistics (FILE *file, hash_table <expr_elt_hasher> htab)
+htab_statistics (FILE *file, const hash_table<expr_elt_hasher> &htab)
{
fprintf (file, "size %ld, %ld elements, %f collision/search ratio\n",
(long) htab.size (),
initialize_hash_element_from_expr (&p->cond, p->value, element);
- slot = avail_exprs.find_slot_with_hash (element, element->hash, INSERT);
+ slot = avail_exprs->find_slot_with_hash (element, element->hash, INSERT);
if (*slot == NULL)
{
*slot = element;
const_and_copies_stack.quick_push (x);
}
+/* Record that X is equal to Y in const_and_copies. Record undo
+ information in the block-local vector. */
+
+static void
+record_const_or_copy (tree x, tree y)
+{
+ tree prev_x = SSA_NAME_VALUE (x);
+
+ gcc_assert (TREE_CODE (x) == SSA_NAME);
+
+ if (TREE_CODE (y) == SSA_NAME)
+ {
+ tree tmp = SSA_NAME_VALUE (y);
+ if (tmp)
+ y = tmp;
+ }
+
+ record_const_or_copy_1 (x, y, prev_x);
+}
+
/* Return the loop depth of the basic block of the defining statement of X.
This number should not be treated as absolutely correct because the loop
information may not be completely up-to-date when dom runs. However, it
will be relatively correct, and as more passes are taught to keep loop info
up to date, the result will become more and more accurate. */
-int
+static int
loop_depth_of_name (tree x)
{
gimple defstmt;
return bb_loop_depth (defbb);
}
-/* Record that X is equal to Y in const_and_copies. Record undo
- information in the block-local vector. */
-
-static void
-record_const_or_copy (tree x, tree y)
-{
- tree prev_x = SSA_NAME_VALUE (x);
-
- gcc_assert (TREE_CODE (x) == SSA_NAME);
-
- if (TREE_CODE (y) == SSA_NAME)
- {
- tree tmp = SSA_NAME_VALUE (y);
- if (tmp)
- y = tmp;
- }
-
- record_const_or_copy_1 (x, y, prev_x);
-}
-
/* Similarly, but assume that X and Y are the two operands of an EQ_EXPR.
This constrains the cases in which we may treat this as assignment. */
if (is_gimple_min_invariant (y))
;
else if (is_gimple_min_invariant (x)
+ /* ??? When threading over backedges the following is important
+ for correctness. See PR61757. */
|| (loop_depth_of_name (x) <= loop_depth_of_name (y)))
prev_x = x, x = y, y = prev_x, prev_x = prev_y;
else if (prev_x && is_gimple_min_invariant (prev_x))
{
int i;
int n_labels = gimple_switch_num_labels (stmt);
- tree *info = XCNEWVEC (tree, last_basic_block);
+ tree *info = XCNEWVEC (tree, last_basic_block_for_fn (cfun));
edge e;
edge_iterator ei;
if (!may_propagate_copy (op, val))
return;
- /* Do not propagate addresses that point to volatiles into memory
- stmts without volatile operands. */
- if (POINTER_TYPE_P (TREE_TYPE (val))
- && TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (val)))
- && gimple_has_mem_ops (stmt)
- && !gimple_has_volatile_ops (stmt))
- return;
-
- /* Do not propagate copies if the propagated value is at a deeper loop
- depth than the propagatee. Otherwise, this may move loop variant
- variables outside of their loops and prevent coalescing
- opportunities. If the value was loop invariant, it will be hoisted
- by LICM and exposed for copy propagation. */
- if (loop_depth_of_name (val) > loop_depth_of_name (op))
- return;
-
/* Do not propagate copies into simple IV increment statements.
See PR23821 for how this can disturb IV analysis. */
if (TREE_CODE (val) != INTEGER_CST
return NULL_TREE;
/* Finally try to find the expression in the main expression hash table. */
- slot = avail_exprs.find_slot_with_hash (&element, element.hash,
- (insert ? INSERT : NO_INSERT));
+ slot = avail_exprs->find_slot (&element, (insert ? INSERT : NO_INSERT));
if (slot == NULL)
{
free_expr_hash_elt_contents (&element);
gimple stmt = ((const struct expr_hash_elt *)p)->stmt;
const struct hashable_expr *expr = &((const struct expr_hash_elt *)p)->expr;
tree vuse;
- hashval_t val = 0;
+ inchash::hash hstate;
- val = iterative_hash_hashable_expr (expr, val);
+ inchash::add_hashable_expr (expr, hstate);
/* If the hash table entry is not associated with a statement, then we
can just hash the expression and not worry about virtual operands
and such. */
if (!stmt)
- return val;
+ return hstate.end ();
/* Add the SSA version numbers of the vuse operand. This is important
because compound variables like arrays are not renamed in the
operands. Rather, the rename is done on the virtual variable
representing all the elements of the array. */
if ((vuse = gimple_vuse (stmt)))
- val = iterative_hash_expr (vuse, val);
+ inchash::add_expr (vuse, hstate);
- return val;
+ return hstate.end ();
}
/* PHI-ONLY copy and constant propagation. This pass is meant to clean
static void
propagate_rhs_into_lhs (gimple stmt, tree lhs, tree rhs, bitmap interesting_names)
{
- /* First verify that propagation is valid and isn't going to move a
- loop variant variable outside its loop. */
- if (! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)
- && (TREE_CODE (rhs) != SSA_NAME
- || ! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs))
- && may_propagate_copy (lhs, rhs)
- && loop_depth_of_name (lhs) >= loop_depth_of_name (rhs))
+ /* First verify that propagation is valid. */
+ if (may_propagate_copy (lhs, rhs))
{
use_operand_p use_p;
imm_use_iterator iter;
pick up the secondary optimization opportunities with minimal
cost. */
-static unsigned int
-eliminate_degenerate_phis (void)
+namespace {
+
+const pass_data pass_data_phi_only_cprop =
+{
+ GIMPLE_PASS, /* type */
+ "phicprop", /* name */
+ OPTGROUP_NONE, /* optinfo_flags */
+ TV_TREE_PHI_CPROP, /* tv_id */
+ ( PROP_cfg | PROP_ssa ), /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ ( TODO_cleanup_cfg | TODO_update_ssa ), /* todo_flags_finish */
+};
+
+class pass_phi_only_cprop : public gimple_opt_pass
+{
+public:
+ pass_phi_only_cprop (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_phi_only_cprop, ctxt)
+ {}
+
+ /* opt_pass methods: */
+ opt_pass * clone () { return new pass_phi_only_cprop (m_ctxt); }
+ virtual bool gate (function *) { return flag_tree_dom != 0; }
+ virtual unsigned int execute (function *);
+
+}; // class pass_phi_only_cprop
+
+unsigned int
+pass_phi_only_cprop::execute (function *fun)
{
bitmap interesting_names;
bitmap interesting_names1;
phase in dominator order. Presumably this is because walking
in dominator order leaves fewer PHIs for later examination
by the worklist phase. */
- eliminate_degenerate_phis_1 (ENTRY_BLOCK_PTR_FOR_FN (cfun),
+ eliminate_degenerate_phis_1 (ENTRY_BLOCK_PTR_FOR_FN (fun),
interesting_names);
/* Second phase. Eliminate second order degenerate PHIs as well
{
free_dominance_info (CDI_DOMINATORS);
/* If we changed the CFG schedule loops for fixup by cfgcleanup. */
- if (current_loops)
- loops_state_set (LOOPS_NEED_FIXUP);
+ loops_state_set (LOOPS_NEED_FIXUP);
}
/* Propagation of const and copies may make some EH edges dead. Purge
return 0;
}
-namespace {
-
-const pass_data pass_data_phi_only_cprop =
-{
- GIMPLE_PASS, /* type */
- "phicprop", /* name */
- OPTGROUP_NONE, /* optinfo_flags */
- true, /* has_gate */
- true, /* has_execute */
- TV_TREE_PHI_CPROP, /* tv_id */
- ( PROP_cfg | PROP_ssa ), /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- ( TODO_cleanup_cfg | TODO_verify_ssa
- | TODO_verify_stmts
- | TODO_update_ssa ), /* todo_flags_finish */
-};
-
-class pass_phi_only_cprop : public gimple_opt_pass
-{
-public:
- pass_phi_only_cprop (gcc::context *ctxt)
- : gimple_opt_pass (pass_data_phi_only_cprop, ctxt)
- {}
-
- /* opt_pass methods: */
- opt_pass * clone () { return new pass_phi_only_cprop (m_ctxt); }
- bool gate () { return gate_dominator (); }
- unsigned int execute () { return eliminate_degenerate_phis (); }
-
-}; // class pass_phi_only_cprop
-
} // anon namespace
gimple_opt_pass *
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