/* SSA operands management for trees.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#include "flags.h"
#include "function.h"
#include "diagnostic.h"
+#include "errors.h"
#include "tree-flow.h"
#include "tree-inline.h"
#include "tree-pass.h"
#include "ggc.h"
#include "timevar.h"
+#include "langhooks.h"
+
+/* This file contains the code required to manage the operands cache of the
+ SSA optimizer. For every stmt, we maintain an operand cache in the stmt
+ annotation. This cache contains operands that will be of interest to
+ optimizers and other passes wishing to manipulate the IL.
+
+ The operand type are broken up into REAL and VIRTUAL operands. The real
+ operands are represented as pointers into the stmt's operand tree. Thus
+ any manipulation of the real operands will be reflected in the actual tree.
+ Virtual operands are represented solely in the cache, although the base
+ variable for the SSA_NAME may, or may not occur in the stmt's tree.
+ Manipulation of the virtual operands will not be reflected in the stmt tree.
+
+ The routines in this file are concerned with creating this operand cache
+ from a stmt tree.
+
+ get_stmt_operands() in the primary entry point.
+
+ The operand tree is the parsed by the various get_* routines which look
+ through the stmt tree for the occurrence of operands which may be of
+ interest, and calls are made to the append_* routines whenever one is
+ found. There are 5 of these routines, each representing one of the
+ 5 types of operands. Defs, Uses, Virtual Uses, Virtual May Defs, and
+ Virtual Must Defs.
+
+ The append_* routines check for duplication, and simply keep a list of
+ unique objects for each operand type in the build_* extendable vectors.
+
+ Once the stmt tree is completely parsed, the finalize_ssa_operands()
+ routine is called, which proceeds to perform the finalization routine
+ on each of the 5 operand vectors which have been built up.
+
+ If the stmt had a previous operand cache, the finalization routines
+ attempt to match up the new operands with the old ones. If its a perfect
+ match, the old vector is simply reused. If it isn't a perfect match, then
+ a new vector is created and the new operands are placed there. For
+ virtual operands, if the previous cache had SSA_NAME version of a
+ variable, and that same variable occurs in the same operands cache, then
+ the new cache vector will also get the same SSA_NAME.
+
+ i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new operand
+ vector for VUSE, then the new vector will also be modified such that
+ it contains 'a_5' rather than 'a'.
+
+*/
+
+
/* Flags to describe operand properties in get_stmt_operands and helpers. */
/* By default, operands are loaded. */
#define opf_is_def (1 << 0)
/* Operand is the target of an assignment expression. */
-#define opf_kill_def (1 << 2)
+#define opf_kill_def (1 << 1)
/* No virtual operands should be created in the expression. This is used
when traversing ADDR_EXPR nodes which have different semantics than
need to consider are indices into arrays. For instance, &a.b[i] should
generate a USE of 'i' but it should not generate a VUSE for 'a' nor a
VUSE for 'b'. */
-#define opf_no_vops (1 << 1)
+#define opf_no_vops (1 << 2)
/* Array for building all the def operands. */
static GTY (()) varray_type build_defs;
/* Array for building all the v_must_def operands. */
static GTY (()) varray_type build_v_must_defs;
-#ifdef ENABLE_CHECKING
-tree check_build_stmt;
-#endif
-
-typedef struct voperands_d
-{
- v_may_def_optype v_may_def_ops;
- vuse_optype vuse_ops;
- v_must_def_optype v_must_def_ops;
-} *voperands_t;
-
-static void note_addressable (tree, stmt_ann_t);
-static void get_expr_operands (tree, tree *, int, voperands_t);
-static inline void append_def (tree *, tree);
-static inline void append_use (tree *, tree);
-static void append_v_may_def (tree, tree, voperands_t);
-static void append_v_must_def (tree, tree, voperands_t);
-static void add_call_clobber_ops (tree, voperands_t);
-static void add_call_read_ops (tree, voperands_t);
-static void add_stmt_operand (tree *, tree, int, voperands_t);
-
-
-struct freelist_d GTY((chain_next ("%h.next")))
-{
- struct freelist_d *next;
-};
-
-#define NUM_FREE 5
-static GTY ((length ("NUM_FREE"))) struct freelist_d optype_freelist[NUM_FREE] = { {0}, {0}, {0}, {0}, {0} };
-
-
-static inline void *
-check_optype_freelist (size_t num ATTRIBUTE_UNUSED)
-{
- return NULL;
-#if 0
- void *vec = NULL;
-
- if (num <= NUM_FREE && optype_freelist[num - 1].next)
- {
- vec = (void *)optype_freelist[num - 1].next;
- optype_freelist[num - 1].next = optype_freelist[num - 1].next->next;
- }
- return vec;
-#endif
-}
-/* Return a vector of contiguous memory of a specified size. */
+/* True if the operands for call clobbered vars are cached and valid. */
+bool ssa_call_clobbered_cache_valid;
+bool ssa_ro_call_cache_valid;
+/* These arrays are the cached operand vectors for call clobbered calls. */
+static GTY (()) varray_type clobbered_v_may_defs;
+static GTY (()) varray_type clobbered_vuses;
+static GTY (()) varray_type ro_call_vuses;
+static bool clobbered_aliased_loads;
+static bool clobbered_aliased_stores;
+static bool ro_call_aliased_loads;
-static inline void
-add_optype_freelist (void *vec ATTRIBUTE_UNUSED, size_t size ATTRIBUTE_UNUSED)
-{
-#if 0
- struct freelist_d *ptr;
#ifdef ENABLE_CHECKING
- if (size == 0)
- abort ();
+/* Used to make sure operand construction is working on the proper stmt. */
+tree check_build_stmt;
#endif
- /* if its bigger than one of our lists, simply let it go and let GC
- collect it. */
- if (size > NUM_FREE)
- return;
-
- ptr = vec;
- ptr->next = optype_freelist[size - 1].next;;
- optype_freelist[size - 1].next = ptr;
-#endif
-}
+def_operand_p NULL_DEF_OPERAND_P = { NULL };
+use_operand_p NULL_USE_OPERAND_P = { NULL };
+static void note_addressable (tree, stmt_ann_t);
+static void get_expr_operands (tree, tree *, int);
+static void get_asm_expr_operands (tree);
+static void get_indirect_ref_operands (tree, tree, int);
+static void get_call_expr_operands (tree, tree);
+static inline void append_def (tree *);
+static inline void append_use (tree *);
+static void append_v_may_def (tree);
+static void append_v_must_def (tree);
+static void add_call_clobber_ops (tree);
+static void add_call_read_ops (tree);
+static void add_stmt_operand (tree *, stmt_ann_t, int);
+
+/* Return a vector of contiguous memory for NUM def operands. */
static inline def_optype
allocate_def_optype (unsigned num)
def_optype def_ops;
unsigned size;
size = sizeof (struct def_optype_d) + sizeof (tree *) * (num - 1);
- def_ops = check_optype_freelist (num);
- if (!def_ops)
- def_ops = ggc_alloc (size);
+ def_ops = ggc_alloc (size);
def_ops->num_defs = num;
return def_ops;
}
+
+/* Return a vector of contiguous memory for NUM use operands. */
+
static inline use_optype
allocate_use_optype (unsigned num)
{
use_optype use_ops;
unsigned size;
size = sizeof (struct use_optype_d) + sizeof (tree *) * (num - 1);
- use_ops = check_optype_freelist (num);
- if (!use_ops)
- use_ops = ggc_alloc (size);
+ use_ops = ggc_alloc (size);
use_ops->num_uses = num;
return use_ops;
}
+
+/* Return a vector of contiguous memory for NUM v_may_def operands. */
+
static inline v_may_def_optype
allocate_v_may_def_optype (unsigned num)
{
v_may_def_optype v_may_def_ops;
unsigned size;
- size = sizeof (struct v_may_def_optype_d) + sizeof (tree) * ((num * 2) - 1);
- v_may_def_ops = check_optype_freelist (num * 2);
- if (!v_may_def_ops)
- v_may_def_ops = ggc_alloc (size);
+ size = sizeof (struct v_may_def_optype_d)
+ + sizeof (v_def_use_operand_type_t) * (num - 1);
+ v_may_def_ops = ggc_alloc (size);
v_may_def_ops->num_v_may_defs = num;
return v_may_def_ops;
}
+
+/* Return a vector of contiguous memory for NUM v_use operands. */
+
static inline vuse_optype
allocate_vuse_optype (unsigned num)
{
vuse_optype vuse_ops;
unsigned size;
size = sizeof (struct vuse_optype_d) + sizeof (tree) * (num - 1);
- vuse_ops = check_optype_freelist (num);
- if (!vuse_ops)
- vuse_ops = ggc_alloc (size);
+ vuse_ops = ggc_alloc (size);
vuse_ops->num_vuses = num;
return vuse_ops;
}
+
+/* Return a vector of contiguous memory for NUM v_must_def operands. */
+
static inline v_must_def_optype
allocate_v_must_def_optype (unsigned num)
{
v_must_def_optype v_must_def_ops;
unsigned size;
- size = sizeof (struct v_must_def_optype_d) + sizeof (tree *) * (num - 1);
- v_must_def_ops = check_optype_freelist (num);
- if (!v_must_def_ops)
- v_must_def_ops = ggc_alloc (size);
+ size = sizeof (struct v_must_def_optype_d) + sizeof (v_def_use_operand_type_t) * (num - 1);
+ v_must_def_ops = ggc_alloc (size);
v_must_def_ops->num_v_must_defs = num;
return v_must_def_ops;
}
+
+/* Free memory for USES. */
+
static inline void
-free_uses (use_optype *uses, bool dealloc)
+free_uses (use_optype *uses)
{
if (*uses)
{
- if (dealloc)
- add_optype_freelist (*uses, (*uses)->num_uses);
+ ggc_free (*uses);
*uses = NULL;
}
}
+
+/* Free memory for DEFS. */
+
static inline void
-free_defs (def_optype *defs, bool dealloc)
+free_defs (def_optype *defs)
{
if (*defs)
{
- if (dealloc)
- add_optype_freelist (*defs, (*defs)->num_defs);
+ ggc_free (*defs);
*defs = NULL;
}
}
+
+/* Free memory for VUSES. */
+
static inline void
-free_vuses (vuse_optype *vuses, bool dealloc)
+free_vuses (vuse_optype *vuses)
{
if (*vuses)
{
- if (dealloc)
- add_optype_freelist (*vuses, (*vuses)->num_vuses);
+ ggc_free (*vuses);
*vuses = NULL;
}
}
+
+/* Free memory for V_MAY_DEFS. */
+
static inline void
-free_v_may_defs (v_may_def_optype *v_may_defs, bool dealloc)
+free_v_may_defs (v_may_def_optype *v_may_defs)
{
if (*v_may_defs)
{
- if (dealloc)
- add_optype_freelist (*v_may_defs, (*v_may_defs)->num_v_may_defs);
+ ggc_free (*v_may_defs);
*v_may_defs = NULL;
}
}
+
+/* Free memory for V_MUST_DEFS. */
+
static inline void
-free_v_must_defs (v_must_def_optype *v_must_defs, bool dealloc)
+free_v_must_defs (v_must_def_optype *v_must_defs)
{
if (*v_must_defs)
{
- if (dealloc)
- add_optype_freelist (*v_must_defs, (*v_must_defs)->num_v_must_defs);
+ ggc_free (*v_must_defs);
*v_must_defs = NULL;
}
}
-void
-remove_vuses (tree stmt)
-{
- stmt_ann_t ann;
-
- ann = stmt_ann (stmt);
- if (ann)
- free_vuses (&(ann->vuse_ops), true);
-}
-
-void
-remove_v_may_defs (tree stmt)
-{
- stmt_ann_t ann;
-
- ann = stmt_ann (stmt);
- if (ann)
- free_v_may_defs (&(ann->v_may_def_ops), true);
-}
-
-void
-remove_v_must_defs (tree stmt)
-{
- stmt_ann_t ann;
- ann = stmt_ann (stmt);
- if (ann)
- free_v_must_defs (&(ann->v_must_def_ops), true);
-}
+/* Initialize the operand cache routines. */
void
init_ssa_operands (void)
{
- int x;
-
VARRAY_TREE_PTR_INIT (build_defs, 5, "build defs");
VARRAY_TREE_PTR_INIT (build_uses, 10, "build uses");
VARRAY_TREE_INIT (build_v_may_defs, 10, "build v_may_defs");
VARRAY_TREE_INIT (build_vuses, 10, "build vuses");
VARRAY_TREE_INIT (build_v_must_defs, 10, "build v_must_defs");
-
- for (x = 0; x < NUM_FREE; x++)
- optype_freelist[x].next = NULL;
}
+
+/* Dispose of anything required by the operand routines. */
+
void
fini_ssa_operands (void)
{
- int x;
- for (x = 0; x < NUM_FREE; x++)
- optype_freelist[x].next = NULL;
+ ggc_free (build_defs);
+ ggc_free (build_uses);
+ ggc_free (build_v_may_defs);
+ ggc_free (build_vuses);
+ ggc_free (build_v_must_defs);
+ build_defs = NULL;
+ build_uses = NULL;
+ build_v_may_defs = NULL;
+ build_vuses = NULL;
+ build_v_must_defs = NULL;
+ if (clobbered_v_may_defs)
+ {
+ ggc_free (clobbered_v_may_defs);
+ ggc_free (clobbered_vuses);
+ clobbered_v_may_defs = NULL;
+ clobbered_vuses = NULL;
+ }
+ if (ro_call_vuses)
+ {
+ ggc_free (ro_call_vuses);
+ ro_call_vuses = NULL;
+ }
}
-static void
-finalize_ssa_defs (tree stmt)
+
+/* All the finalize_ssa_* routines do the work required to turn the build_
+ VARRAY into an operand_vector of the appropriate type. The original vector,
+ if any, is passed in for comparison and virtual SSA_NAME reuse. If the
+ old vector is reused, the pointer passed in is set to NULL so that
+ the memory is not freed when the old operands are freed. */
+
+/* Return a new def operand vector for STMT, comparing to OLD_OPS_P. */
+
+static def_optype
+finalize_ssa_defs (def_optype *old_ops_p, tree stmt ATTRIBUTE_UNUSED)
{
unsigned num, x;
- stmt_ann_t ann;
- def_optype def_ops;
+ def_optype def_ops, old_ops;
+ bool build_diff;
num = VARRAY_ACTIVE_SIZE (build_defs);
if (num == 0)
- return;
+ return NULL;
-#ifdef ENABLE_CHECKING
/* There should only be a single real definition per assignment. */
- if (TREE_CODE (stmt) == MODIFY_EXPR && num > 1)
- abort ();
-#endif
+ gcc_assert (TREE_CODE (stmt) != MODIFY_EXPR || num <= 1);
+
+ old_ops = *old_ops_p;
+
+ /* Compare old vector and new array. */
+ build_diff = true;
+ if (old_ops && old_ops->num_defs == num)
+ {
+ build_diff = false;
+ for (x = 0; x < num; x++)
+ if (old_ops->defs[x].def != VARRAY_TREE_PTR (build_defs, x))
+ {
+ build_diff = true;
+ break;
+ }
+ }
+
+ if (!build_diff)
+ {
+ def_ops = old_ops;
+ *old_ops_p = NULL;
+ }
+ else
+ {
+ def_ops = allocate_def_optype (num);
+ for (x = 0; x < num ; x++)
+ def_ops->defs[x].def = VARRAY_TREE_PTR (build_defs, x);
+ }
- def_ops = allocate_def_optype (num);
- for (x = 0; x < num ; x++)
- def_ops->defs[x] = VARRAY_TREE_PTR (build_defs, x);
VARRAY_POP_ALL (build_defs);
- ann = stmt_ann (stmt);
- ann->def_ops = def_ops;
+ return def_ops;
}
-static void
-finalize_ssa_uses (tree stmt)
+
+/* Return a new use operand vector for STMT, comparing to OLD_OPS_P. */
+
+static use_optype
+finalize_ssa_uses (use_optype *old_ops_p, tree stmt ATTRIBUTE_UNUSED)
{
unsigned num, x;
- use_optype use_ops;
- stmt_ann_t ann;
+ use_optype use_ops, old_ops;
+ bool build_diff;
num = VARRAY_ACTIVE_SIZE (build_uses);
if (num == 0)
- return;
+ return NULL;
#ifdef ENABLE_CHECKING
{
initial call to get_stmt_operands does not pass a pointer to a
statement). */
for (x = 0; x < num; x++)
- if (*(VARRAY_TREE_PTR (build_uses, x)) == stmt)
- abort ();
+ gcc_assert (*(VARRAY_TREE_PTR (build_uses, x)) != stmt);
}
#endif
+ old_ops = *old_ops_p;
+
+ /* Check if the old vector and the new array are the same. */
+ build_diff = true;
+ if (old_ops && old_ops->num_uses == num)
+ {
+ build_diff = false;
+ for (x = 0; x < num; x++)
+ if (old_ops->uses[x].use != VARRAY_TREE_PTR (build_uses, x))
+ {
+ build_diff = true;
+ break;
+ }
+ }
- use_ops = allocate_use_optype (num);
- for (x = 0; x < num ; x++)
- use_ops->uses[x] = VARRAY_TREE_PTR (build_uses, x);
+ if (!build_diff)
+ {
+ use_ops = old_ops;
+ *old_ops_p = NULL;
+ }
+ else
+ {
+ use_ops = allocate_use_optype (num);
+ for (x = 0; x < num ; x++)
+ use_ops->uses[x].use = VARRAY_TREE_PTR (build_uses, x);
+ }
VARRAY_POP_ALL (build_uses);
- ann = stmt_ann (stmt);
- ann->use_ops = use_ops;
+ return use_ops;
}
-static void
-finalize_ssa_v_may_defs (tree stmt)
+
+/* Return a new v_may_def operand vector for STMT, comparing to OLD_OPS_P. */
+
+static v_may_def_optype
+finalize_ssa_v_may_defs (v_may_def_optype *old_ops_p)
{
- unsigned num, x;
- v_may_def_optype v_may_def_ops;
- stmt_ann_t ann;
+ unsigned num, x, i, old_num;
+ v_may_def_optype v_may_def_ops, old_ops;
+ tree result, var;
+ bool build_diff;
num = VARRAY_ACTIVE_SIZE (build_v_may_defs);
if (num == 0)
- return;
+ return NULL;
-#ifdef ENABLE_CHECKING
- /* V_MAY_DEFs must be entered in pairs of result/uses. */
- if (num % 2 != 0)
- abort();
-#endif
+ old_ops = *old_ops_p;
- v_may_def_ops = allocate_v_may_def_optype (num / 2);
- for (x = 0; x < num; x++)
- v_may_def_ops->v_may_defs[x] = VARRAY_TREE (build_v_may_defs, x);
- VARRAY_CLEAR (build_v_may_defs);
+ /* Check if the old vector and the new array are the same. */
+ build_diff = true;
+ if (old_ops && old_ops->num_v_may_defs == num)
+ {
+ old_num = num;
+ build_diff = false;
+ for (x = 0; x < num; x++)
+ {
+ var = old_ops->v_may_defs[x].def;
+ if (TREE_CODE (var) == SSA_NAME)
+ var = SSA_NAME_VAR (var);
+ if (var != VARRAY_TREE (build_v_may_defs, x))
+ {
+ build_diff = true;
+ break;
+ }
+ }
+ }
+ else
+ old_num = (old_ops ? old_ops->num_v_may_defs : 0);
- ann = stmt_ann (stmt);
- ann->v_may_def_ops = v_may_def_ops;
+ if (!build_diff)
+ {
+ v_may_def_ops = old_ops;
+ *old_ops_p = NULL;
+ }
+ else
+ {
+ v_may_def_ops = allocate_v_may_def_optype (num);
+ for (x = 0; x < num; x++)
+ {
+ var = VARRAY_TREE (build_v_may_defs, x);
+ /* Look for VAR in the old operands vector. */
+ for (i = 0; i < old_num; i++)
+ {
+ result = old_ops->v_may_defs[i].def;
+ if (TREE_CODE (result) == SSA_NAME)
+ result = SSA_NAME_VAR (result);
+ if (result == var)
+ {
+ v_may_def_ops->v_may_defs[x] = old_ops->v_may_defs[i];
+ break;
+ }
+ }
+ if (i == old_num)
+ {
+ v_may_def_ops->v_may_defs[x].def = var;
+ v_may_def_ops->v_may_defs[x].use = var;
+ }
+ }
+ }
+
+ /* Empty the V_MAY_DEF build vector after VUSES have been processed. */
+
+ return v_may_def_ops;
}
+
+/* Clear the in_list bits and empty the build array for v_may_defs. */
+
static inline void
-finalize_ssa_vuses (tree stmt)
+cleanup_v_may_defs (void)
{
- unsigned num, x;
- stmt_ann_t ann;
- vuse_optype vuse_ops;
- v_may_def_optype v_may_defs;
+ unsigned x, num;
+ num = VARRAY_ACTIVE_SIZE (build_v_may_defs);
-#ifdef ENABLE_CHECKING
- if (VARRAY_ACTIVE_SIZE (build_v_may_defs) > 0)
+ for (x = 0; x < num; x++)
{
- fprintf (stderr, "Please finalize V_MAY_DEFs before finalize VUSES.\n");
- abort ();
+ tree t = VARRAY_TREE (build_v_may_defs, x);
+ var_ann_t ann = var_ann (t);
+ ann->in_v_may_def_list = 0;
}
-#endif
+ VARRAY_POP_ALL (build_v_may_defs);
+}
+
+/* Return a new vuse operand vector, comparing to OLD_OPS_P. */
+
+static vuse_optype
+finalize_ssa_vuses (vuse_optype *old_ops_p)
+{
+ unsigned num, x, i, num_v_may_defs, old_num;
+ vuse_optype vuse_ops, old_ops;
+ bool build_diff;
num = VARRAY_ACTIVE_SIZE (build_vuses);
if (num == 0)
- return;
+ {
+ cleanup_v_may_defs ();
+ return NULL;
+ }
/* Remove superfluous VUSE operands. If the statement already has a
V_MAY_DEF operation for a variable 'a', then a VUSE for 'a' is not
The VUSE <a_2> is superfluous because it is implied by the V_MAY_DEF
operation. */
- ann = stmt_ann (stmt);
- v_may_defs = V_MAY_DEF_OPS (ann);
- if (NUM_V_MAY_DEFS (v_may_defs) > 0)
+ num_v_may_defs = VARRAY_ACTIVE_SIZE (build_v_may_defs);
+
+ if (num_v_may_defs > 0)
{
- size_t i, j;
+ size_t i;
+ tree vuse;
for (i = 0; i < VARRAY_ACTIVE_SIZE (build_vuses); i++)
{
- bool found = false;
- for (j = 0; j < NUM_V_MAY_DEFS (v_may_defs); j++)
+ vuse = VARRAY_TREE (build_vuses, i);
+ if (TREE_CODE (vuse) != SSA_NAME)
{
- tree vuse_var, v_may_def_var;
- tree vuse = VARRAY_TREE (build_vuses, i);
- tree v_may_def = V_MAY_DEF_OP (v_may_defs, j);
+ var_ann_t ann = var_ann (vuse);
+ ann->in_vuse_list = 0;
+ if (ann->in_v_may_def_list)
+ {
+ /* If we found a useless VUSE operand, remove it from the
+ operand array by replacing it with the last active element
+ in the operand array (unless the useless VUSE was the
+ last operand, in which case we simply remove it. */
+ if (i != VARRAY_ACTIVE_SIZE (build_vuses) - 1)
+ {
+ VARRAY_TREE (build_vuses, i)
+ = VARRAY_TREE (build_vuses,
+ VARRAY_ACTIVE_SIZE (build_vuses) - 1);
+ }
+ VARRAY_POP (build_vuses);
- if (TREE_CODE (vuse) == SSA_NAME)
- vuse_var = SSA_NAME_VAR (vuse);
- else
- vuse_var = vuse;
+ /* We want to rescan the element at this index, unless
+ this was the last element, in which case the loop
+ terminates. */
+ i--;
+ }
+ }
+ }
+ }
+ else
+ /* Clear out the in_list bits. */
+ for (x = 0; x < num; x++)
+ {
+ tree t = VARRAY_TREE (build_vuses, x);
+ if (TREE_CODE (t) != SSA_NAME)
+ {
+ var_ann_t ann = var_ann (t);
+ ann->in_vuse_list = 0;
+ }
+ }
- if (TREE_CODE (v_may_def) == SSA_NAME)
- v_may_def_var = SSA_NAME_VAR (v_may_def);
- else
- v_may_def_var = v_may_def;
- if (vuse_var == v_may_def_var)
- {
- found = true;
- break;
- }
+ num = VARRAY_ACTIVE_SIZE (build_vuses);
+ /* We could have reduced the size to zero now, however. */
+ if (num == 0)
+ {
+ cleanup_v_may_defs ();
+ return NULL;
+ }
+
+ old_ops = *old_ops_p;
+
+ /* Determine whether vuses is the same as the old vector. */
+ build_diff = true;
+ if (old_ops && old_ops->num_vuses == num)
+ {
+ old_num = num;
+ build_diff = false;
+ for (x = 0; x < num ; x++)
+ {
+ tree v;
+ v = old_ops->vuses[x];
+ if (TREE_CODE (v) == SSA_NAME)
+ v = SSA_NAME_VAR (v);
+ if (v != VARRAY_TREE (build_vuses, x))
+ {
+ build_diff = true;
+ break;
}
+ }
+ }
+ else
+ old_num = (old_ops ? old_ops->num_vuses : 0);
- /* If we found a useless VUSE operand, remove it from the
- operand array by replacing it with the last active element
- in the operand array (unless the useless VUSE was the
- last operand, in which case we simply remove it. */
- if (found)
+ if (!build_diff)
+ {
+ vuse_ops = old_ops;
+ *old_ops_p = NULL;
+ }
+ else
+ {
+ vuse_ops = allocate_vuse_optype (num);
+ for (x = 0; x < num; x++)
+ {
+ tree result, var = VARRAY_TREE (build_vuses, x);
+ /* Look for VAR in the old vector, and use that SSA_NAME. */
+ for (i = 0; i < old_num; i++)
{
- if (i != VARRAY_ACTIVE_SIZE (build_vuses) - 1)
- {
- VARRAY_TREE (build_vuses, i)
- = VARRAY_TREE (build_vuses,
- VARRAY_ACTIVE_SIZE (build_vuses) - 1);
+ result = old_ops->vuses[i];
+ if (TREE_CODE (result) == SSA_NAME)
+ result = SSA_NAME_VAR (result);
+ if (result == var)
+ {
+ vuse_ops->vuses[x] = old_ops->vuses[i];
+ break;
}
- VARRAY_POP (build_vuses);
-
- /* We want to rescan the element at this index, unless
- this was the last element, in which case the loop
- terminates. */
- i--;
}
+ if (i == old_num)
+ vuse_ops->vuses[x] = var;
}
}
- num = VARRAY_ACTIVE_SIZE (build_vuses);
- /* We could have reduced the size to zero now, however. */
- if (num == 0)
- return;
+ /* The v_may_def build vector wasn't freed because we needed it here.
+ Free it now with the vuses build vector. */
+ VARRAY_POP_ALL (build_vuses);
+ cleanup_v_may_defs ();
- vuse_ops = allocate_vuse_optype (num);
- for (x = 0; x < num; x++)
- vuse_ops->vuses[x] = VARRAY_TREE (build_vuses, x);
- VARRAY_CLEAR (build_vuses);
- ann->vuse_ops = vuse_ops;
+ return vuse_ops;
}
-static void
-finalize_ssa_v_must_defs (tree stmt)
+/* Return a new v_must_def operand vector for STMT, comparing to OLD_OPS_P. */
+
+static v_must_def_optype
+finalize_ssa_v_must_defs (v_must_def_optype *old_ops_p,
+ tree stmt ATTRIBUTE_UNUSED)
{
- unsigned num, x;
- stmt_ann_t ann;
- v_must_def_optype v_must_def_ops;
+ unsigned num, x, i, old_num = 0;
+ v_must_def_optype v_must_def_ops, old_ops;
+ bool build_diff;
num = VARRAY_ACTIVE_SIZE (build_v_must_defs);
if (num == 0)
- return;
+ return NULL;
-#ifdef ENABLE_CHECKING
/* There should only be a single V_MUST_DEF per assignment. */
- if (TREE_CODE (stmt) == MODIFY_EXPR && num > 1)
- abort ();
-#endif
+ gcc_assert (TREE_CODE (stmt) != MODIFY_EXPR || num <= 1);
+
+ old_ops = *old_ops_p;
+
+ /* Check if the old vector and the new array are the same. */
+ build_diff = true;
+ if (old_ops && old_ops->num_v_must_defs == num)
+ {
+ old_num = num;
+ build_diff = false;
+ for (x = 0; x < num; x++)
+ {
+ tree var = old_ops->v_must_defs[x].def;
+ if (TREE_CODE (var) == SSA_NAME)
+ var = SSA_NAME_VAR (var);
+ if (var != VARRAY_TREE (build_v_must_defs, x))
+ {
+ build_diff = true;
+ break;
+ }
+ }
+ }
+ else
+ old_num = (old_ops ? old_ops->num_v_must_defs : 0);
- v_must_def_ops = allocate_v_must_def_optype (num);
- for (x = 0; x < num ; x++)
- v_must_def_ops->v_must_defs[x] = VARRAY_TREE (build_v_must_defs, x);
+ if (!build_diff)
+ {
+ v_must_def_ops = old_ops;
+ *old_ops_p = NULL;
+ }
+ else
+ {
+ v_must_def_ops = allocate_v_must_def_optype (num);
+ for (x = 0; x < num ; x++)
+ {
+ tree result, var = VARRAY_TREE (build_v_must_defs, x);
+ /* Look for VAR in the original vector. */
+ for (i = 0; i < old_num; i++)
+ {
+ result = old_ops->v_must_defs[i].def;
+ if (TREE_CODE (result) == SSA_NAME)
+ result = SSA_NAME_VAR (result);
+ if (result == var)
+ {
+ v_must_def_ops->v_must_defs[x].def = old_ops->v_must_defs[i].def;
+ v_must_def_ops->v_must_defs[x].use = old_ops->v_must_defs[i].use;
+ break;
+ }
+ }
+ if (i == old_num)
+ {
+ v_must_def_ops->v_must_defs[x].def = var;
+ v_must_def_ops->v_must_defs[x].use = var;
+ }
+ }
+ }
VARRAY_POP_ALL (build_v_must_defs);
- ann = stmt_ann (stmt);
- ann->v_must_def_ops = v_must_def_ops;
+ return v_must_def_ops;
}
-extern void
-finalize_ssa_stmt_operands (tree stmt)
-{
-#ifdef ENABLE_CHECKING
- if (check_build_stmt == NULL)
- abort();
-#endif
- finalize_ssa_defs (stmt);
- finalize_ssa_uses (stmt);
- finalize_ssa_v_must_defs (stmt);
- finalize_ssa_v_may_defs (stmt);
- finalize_ssa_vuses (stmt);
+/* Finalize all the build vectors, fill the new ones into INFO. */
-#ifdef ENABLE_CHECKING
- check_build_stmt = NULL;
-#endif
+static inline void
+finalize_ssa_stmt_operands (tree stmt, stmt_operands_p old_ops,
+ stmt_operands_p new_ops)
+{
+ new_ops->def_ops = finalize_ssa_defs (&(old_ops->def_ops), stmt);
+ new_ops->use_ops = finalize_ssa_uses (&(old_ops->use_ops), stmt);
+ new_ops->v_must_def_ops
+ = finalize_ssa_v_must_defs (&(old_ops->v_must_def_ops), stmt);
+ new_ops->v_may_def_ops = finalize_ssa_v_may_defs (&(old_ops->v_may_def_ops));
+ new_ops->vuse_ops = finalize_ssa_vuses (&(old_ops->vuse_ops));
}
-extern void
-verify_start_operands (tree stmt ATTRIBUTE_UNUSED)
+/* Start the process of building up operands vectors in INFO. */
+
+static inline void
+start_ssa_stmt_operands (void)
{
-#ifdef ENABLE_CHECKING
- if (VARRAY_ACTIVE_SIZE (build_defs) > 0
- || VARRAY_ACTIVE_SIZE (build_uses) > 0
- || VARRAY_ACTIVE_SIZE (build_vuses) > 0
- || VARRAY_ACTIVE_SIZE (build_v_may_defs) > 0
- || VARRAY_ACTIVE_SIZE (build_v_must_defs) > 0)
- abort ();
- if (check_build_stmt != NULL)
- abort();
- check_build_stmt = stmt;
-#endif
+ gcc_assert (VARRAY_ACTIVE_SIZE (build_defs) == 0);
+ gcc_assert (VARRAY_ACTIVE_SIZE (build_uses) == 0);
+ gcc_assert (VARRAY_ACTIVE_SIZE (build_vuses) == 0);
+ gcc_assert (VARRAY_ACTIVE_SIZE (build_v_may_defs) == 0);
+ gcc_assert (VARRAY_ACTIVE_SIZE (build_v_must_defs) == 0);
}
-/* Add DEF_P to the list of pointers to operands defined by STMT. */
+/* Add DEF_P to the list of pointers to operands. */
static inline void
-append_def (tree *def_p, tree stmt ATTRIBUTE_UNUSED)
+append_def (tree *def_p)
{
-#ifdef ENABLE_CHECKING
- if (check_build_stmt != stmt)
- abort();
-#endif
VARRAY_PUSH_TREE_PTR (build_defs, def_p);
}
-/* Add USE_P to the list of pointers to operands used by STMT. */
+/* Add USE_P to the list of pointers to operands. */
static inline void
-append_use (tree *use_p, tree stmt ATTRIBUTE_UNUSED)
+append_use (tree *use_p)
{
-#ifdef ENABLE_CHECKING
- if (check_build_stmt != stmt)
- abort();
-#endif
VARRAY_PUSH_TREE_PTR (build_uses, use_p);
}
-/* Add a new virtual def for variable VAR to statement STMT. If PREV_VOPS
- is not NULL, the existing entries are preserved and no new entries are
- added here. This is done to preserve the SSA numbering of virtual
- operands. */
+/* Add a new virtual may def for variable VAR to the build array. */
-static void
-append_v_may_def (tree var, tree stmt, voperands_t prev_vops)
+static inline void
+append_v_may_def (tree var)
{
- stmt_ann_t ann;
- size_t i;
- tree result, source;
-
-#ifdef ENABLE_CHECKING
- if (check_build_stmt != stmt)
- abort();
-#endif
-
- ann = stmt_ann (stmt);
+ var_ann_t ann = get_var_ann (var);
/* Don't allow duplicate entries. */
+ if (ann->in_v_may_def_list)
+ return;
+ ann->in_v_may_def_list = 1;
- for (i = 0; i < VARRAY_ACTIVE_SIZE (build_v_may_defs); i += 2)
- {
- tree result = VARRAY_TREE (build_v_may_defs, i);
- if (var == result
- || (TREE_CODE (result) == SSA_NAME
- && var == SSA_NAME_VAR (result)))
- return;
- }
-
- /* If the statement already had virtual definitions, see if any of the
- existing V_MAY_DEFs matches VAR. If so, re-use it, otherwise add a new
- V_MAY_DEF for VAR. */
- result = NULL_TREE;
- source = NULL_TREE;
- if (prev_vops)
- for (i = 0; i < NUM_V_MAY_DEFS (prev_vops->v_may_def_ops); i++)
- {
- result = V_MAY_DEF_RESULT (prev_vops->v_may_def_ops, i);
- if (result == var
- || (TREE_CODE (result) == SSA_NAME
- && SSA_NAME_VAR (result) == var))
- {
- source = V_MAY_DEF_OP (prev_vops->v_may_def_ops, i);
- break;
- }
- }
-
- /* If no previous V_MAY_DEF operand was found for VAR, create one now. */
- if (source == NULL_TREE)
- {
- result = var;
- source = var;
- }
-
- VARRAY_PUSH_TREE (build_v_may_defs, result);
- VARRAY_PUSH_TREE (build_v_may_defs, source);
+ VARRAY_PUSH_TREE (build_v_may_defs, var);
}
-/* Add VAR to the list of virtual uses for STMT. If PREV_VOPS
- is not NULL, the existing entries are preserved and no new entries are
- added here. This is done to preserve the SSA numbering of virtual
- operands. */
+/* Add VAR to the list of virtual uses. */
-static void
-append_vuse (tree var, tree stmt, voperands_t prev_vops)
+static inline void
+append_vuse (tree var)
{
- stmt_ann_t ann;
- size_t i;
- bool found;
- tree vuse;
-
-#ifdef ENABLE_CHECKING
- if (check_build_stmt != stmt)
- abort();
-#endif
-
- ann = stmt_ann (stmt);
/* Don't allow duplicate entries. */
- for (i = 0; i < VARRAY_ACTIVE_SIZE (build_vuses); i++)
+ if (TREE_CODE (var) != SSA_NAME)
{
- tree vuse_var = VARRAY_TREE (build_vuses, i);
- if (var == vuse_var
- || (TREE_CODE (vuse_var) == SSA_NAME
- && var == SSA_NAME_VAR (vuse_var)))
- return;
- }
-
- /* If the statement already had virtual uses, see if any of the
- existing VUSEs matches VAR. If so, re-use it, otherwise add a new
- VUSE for VAR. */
- found = false;
- vuse = NULL_TREE;
- if (prev_vops)
- for (i = 0; i < NUM_VUSES (prev_vops->vuse_ops); i++)
- {
- vuse = VUSE_OP (prev_vops->vuse_ops, i);
- if (vuse == var
- || (TREE_CODE (vuse) == SSA_NAME
- && SSA_NAME_VAR (vuse) == var))
- {
- found = true;
- break;
- }
- }
+ var_ann_t ann = get_var_ann (var);
- /* If VAR existed already in PREV_VOPS, re-use it. */
- if (found)
- var = vuse;
+ if (ann->in_vuse_list || ann->in_v_may_def_list)
+ return;
+ ann->in_vuse_list = 1;
+ }
VARRAY_PUSH_TREE (build_vuses, var);
}
-/* Add VAR to the list of virtual must definitions for STMT. If PREV_VOPS
- is not NULL, the existing entries are preserved and no new entries are
- added here. This is done to preserve the SSA numbering of virtual
- operands. */
-static void
-append_v_must_def (tree var, tree stmt, voperands_t prev_vops)
-{
- stmt_ann_t ann;
- size_t i;
- bool found;
- tree v_must_def;
-
-#ifdef ENABLE_CHECKING
- if (check_build_stmt != stmt)
- abort();
-#endif
+/* Add VAR to the list of virtual must definitions for INFO. */
- ann = stmt_ann (stmt);
+static inline void
+append_v_must_def (tree var)
+{
+ unsigned i;
/* Don't allow duplicate entries. */
for (i = 0; i < VARRAY_ACTIVE_SIZE (build_v_must_defs); i++)
- {
- tree v_must_def_var = VARRAY_TREE (build_v_must_defs, i);
- if (var == v_must_def_var
- || (TREE_CODE (v_must_def_var) == SSA_NAME
- && var == SSA_NAME_VAR (v_must_def_var)))
- return;
- }
-
- /* If the statement already had virtual must defs, see if any of the
- existing V_MUST_DEFs matches VAR. If so, re-use it, otherwise add a new
- V_MUST_DEF for VAR. */
- found = false;
- v_must_def = NULL_TREE;
- if (prev_vops)
- for (i = 0; i < NUM_V_MUST_DEFS (prev_vops->v_must_def_ops); i++)
- {
- v_must_def = V_MUST_DEF_OP (prev_vops->v_must_def_ops, i);
- if (v_must_def == var
- || (TREE_CODE (v_must_def) == SSA_NAME
- && SSA_NAME_VAR (v_must_def) == var))
- {
- found = true;
- break;
- }
- }
-
- /* If VAR existed already in PREV_VOPS, re-use it. */
- if (found)
- var = v_must_def;
+ if (var == VARRAY_TREE (build_v_must_defs, i))
+ return;
VARRAY_PUSH_TREE (build_v_must_defs, var);
}
+/* Create an operands cache for STMT, returning it in NEW_OPS. OLD_OPS are the
+ original operands, and if ANN is non-null, appropriate stmt flags are set
+ in the stmt's annotation. Note that some fields in old_ops may
+ change to NULL, although none of the memory they originally pointed to
+ will be destroyed. It is appropriate to call free_stmt_operands() on
+ the value returned in old_ops.
-/* External entry point which by-passes the previous vops mechanism. */
-void
-add_vuse (tree var, tree stmt)
-{
- append_vuse (var, stmt, NULL);
-}
-
+ The rationale for this: Certain optimizations wish to examine the difference
+ between new_ops and old_ops after processing. If a set of operands don't
+ change, new_ops will simply assume the pointer in old_ops, and the old_ops
+ pointer will be set to NULL, indicating no memory needs to be cleared.
+ Usage might appear something like:
-/* Get the operands of statement STMT. Note that repeated calls to
- get_stmt_operands for the same statement will do nothing until the
- statement is marked modified by a call to modify_stmt(). */
+ old_ops_copy = old_ops = stmt_ann(stmt)->operands;
+ build_ssa_operands (stmt, NULL, &old_ops, &new_ops);
+ <* compare old_ops_copy and new_ops *>
+ free_ssa_operands (old_ops); */
-void
-get_stmt_operands (tree stmt)
+static void
+build_ssa_operands (tree stmt, stmt_ann_t ann, stmt_operands_p old_ops,
+ stmt_operands_p new_ops)
{
enum tree_code code;
- stmt_ann_t ann;
- struct voperands_d prev_vops;
-
-#if defined ENABLE_CHECKING
- /* The optimizers cannot handle statements that are nothing but a
- _DECL. This indicates a bug in the gimplifier. */
- if (SSA_VAR_P (stmt))
- abort ();
-#endif
-
- /* Ignore error statements. */
- if (TREE_CODE (stmt) == ERROR_MARK)
- return;
-
- ann = get_stmt_ann (stmt);
-
- /* If the statement has not been modified, the operands are still valid. */
- if (!ann->modified)
- return;
-
- timevar_push (TV_TREE_OPS);
-
+ tree_ann_t saved_ann = stmt->common.ann;
+
+ /* Replace stmt's annotation with the one passed in for the duration
+ of the operand building process. This allows "fake" stmts to be built
+ and not be included in other data structures which can be built here. */
+ stmt->common.ann = (tree_ann_t) ann;
+
/* Initially assume that the statement has no volatile operands, nor
makes aliased loads or stores. */
- ann->has_volatile_ops = false;
- ann->makes_aliased_stores = false;
- ann->makes_aliased_loads = false;
-
- /* Remove any existing operands as they will be scanned again. */
- free_defs (&(ann->def_ops), true);
- free_uses (&(ann->use_ops), true);
-
- /* Before removing existing virtual operands, save them in PREV_VOPS so
- that we can re-use their SSA versions. */
- prev_vops.v_may_def_ops = V_MAY_DEF_OPS (ann);
- prev_vops.vuse_ops = VUSE_OPS (ann);
- prev_vops.v_must_def_ops = V_MUST_DEF_OPS (ann);
-
- /* Dont free the previous values to memory since we're still using them. */
- free_v_may_defs (&(ann->v_may_def_ops), false);
- free_vuses (&(ann->vuse_ops), false);
- free_v_must_defs (&(ann->v_must_def_ops), false);
+ if (ann)
+ {
+ ann->has_volatile_ops = false;
+ ann->makes_aliased_stores = false;
+ ann->makes_aliased_loads = false;
+ }
- start_ssa_stmt_operands (stmt);
+ start_ssa_stmt_operands ();
code = TREE_CODE (stmt);
switch (code)
{
case MODIFY_EXPR:
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 1), opf_none, &prev_vops);
- if (TREE_CODE (TREE_OPERAND (stmt, 0)) == ARRAY_REF
- || TREE_CODE (TREE_OPERAND (stmt, 0)) == COMPONENT_REF
- || TREE_CODE (TREE_OPERAND (stmt, 0)) == REALPART_EXPR
- || TREE_CODE (TREE_OPERAND (stmt, 0)) == IMAGPART_EXPR
- /* Use a V_MAY_DEF if the RHS might throw, as the LHS won't be
- modified in that case. FIXME we should represent somehow
- that it is killed on the fallthrough path. */
- || tree_could_throw_p (TREE_OPERAND (stmt, 1)))
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_is_def,
- &prev_vops);
- else
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0),
- opf_is_def | opf_kill_def, &prev_vops);
+ /* First get operands from the RHS. For the LHS, we use a V_MAY_DEF if
+ either only part of LHS is modified or if the RHS might throw,
+ otherwise, use V_MUST_DEF.
+
+ ??? If it might throw, we should represent somehow that it is killed
+ on the fallthrough path. */
+ {
+ tree lhs = TREE_OPERAND (stmt, 0);
+ int lhs_flags = opf_is_def;
+
+ get_expr_operands (stmt, &TREE_OPERAND (stmt, 1), opf_none);
+
+ /* If the LHS is a VIEW_CONVERT_EXPR, it isn't changing whether
+ or not the entire LHS is modified; that depends on what's
+ inside the VIEW_CONVERT_EXPR. */
+ if (TREE_CODE (lhs) == VIEW_CONVERT_EXPR)
+ lhs = TREE_OPERAND (lhs, 0);
+
+ if (TREE_CODE (lhs) != ARRAY_REF && TREE_CODE (lhs) != ARRAY_RANGE_REF
+ && TREE_CODE (lhs) != COMPONENT_REF
+ && TREE_CODE (lhs) != BIT_FIELD_REF
+ && TREE_CODE (lhs) != REALPART_EXPR
+ && TREE_CODE (lhs) != IMAGPART_EXPR)
+ lhs_flags |= opf_kill_def;
+
+ get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), lhs_flags);
+ }
break;
case COND_EXPR:
- get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_none, &prev_vops);
+ get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_none);
break;
case SWITCH_EXPR:
- get_expr_operands (stmt, &SWITCH_COND (stmt), opf_none, &prev_vops);
+ get_expr_operands (stmt, &SWITCH_COND (stmt), opf_none);
break;
case ASM_EXPR:
- {
- int noutputs = list_length (ASM_OUTPUTS (stmt));
- const char **oconstraints
- = (const char **) alloca ((noutputs) * sizeof (const char *));
- int i;
- tree link;
- const char *constraint;
- bool allows_mem, allows_reg, is_inout;
-
- for (i=0, link = ASM_OUTPUTS (stmt); link;
- ++i, link = TREE_CHAIN (link))
- {
- oconstraints[i] = constraint
- = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_output_constraint (&constraint, i, 0, 0,
- &allows_mem, &allows_reg, &is_inout);
- if (allows_reg && is_inout)
- /* This should have been split in gimplify_asm_expr. */
- abort ();
-
- if (!allows_reg && allows_mem)
- {
- tree t = get_base_address (TREE_VALUE (link));
- if (t && DECL_P (t))
- mark_call_clobbered (t);
- }
-
- get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def,
- &prev_vops);
- }
-
- for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
- {
- constraint
- = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_input_constraint (&constraint, 0, 0, noutputs, 0,
- oconstraints, &allows_mem, &allows_reg);
-
- if (!allows_reg && allows_mem)
- {
- tree t = get_base_address (TREE_VALUE (link));
- if (t && DECL_P (t))
- mark_call_clobbered (t);
- }
-
- get_expr_operands (stmt, &TREE_VALUE (link), 0, &prev_vops);
- }
-
- /* Clobber memory for asm ("" : : : "memory"); */
- for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
- if (!strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory"))
- add_call_clobber_ops (stmt, &prev_vops);
- }
+ get_asm_expr_operands (stmt);
break;
case RETURN_EXPR:
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_none, &prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_none);
break;
case GOTO_EXPR:
- get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_none, &prev_vops);
+ get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_none);
break;
case LABEL_EXPR:
- get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_none, &prev_vops);
+ get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_none);
break;
/* These nodes contain no variable references. */
default:
/* Notice that if get_expr_operands tries to use &STMT as the operand
pointer (which may only happen for USE operands), we will abort in
- append_use. This default will handle statements like empty statements,
- CALL_EXPRs or VA_ARG_EXPRs that may appear on the RHS of a statement
+ append_use. This default will handle statements like empty
+ statements, or CALL_EXPRs that may appear on the RHS of a statement
or as statements themselves. */
- get_expr_operands (stmt, &stmt, opf_none, &prev_vops);
+ get_expr_operands (stmt, &stmt, opf_none);
break;
}
- finalize_ssa_stmt_operands (stmt);
+ finalize_ssa_stmt_operands (stmt, old_ops, new_ops);
+ stmt->common.ann = saved_ann;
+}
+
+
+/* Free any operands vectors in OPS. */
+
+static void
+free_ssa_operands (stmt_operands_p ops)
+{
+ if (ops->def_ops)
+ free_defs (&(ops->def_ops));
+ if (ops->use_ops)
+ free_uses (&(ops->use_ops));
+ if (ops->vuse_ops)
+ free_vuses (&(ops->vuse_ops));
+ if (ops->v_may_def_ops)
+ free_v_may_defs (&(ops->v_may_def_ops));
+ if (ops->v_must_def_ops)
+ free_v_must_defs (&(ops->v_must_def_ops));
+}
+
+
+/* Get the operands of statement STMT. Note that repeated calls to
+ get_stmt_operands for the same statement will do nothing until the
+ statement is marked modified by a call to modify_stmt(). */
+
+void
+get_stmt_operands (tree stmt)
+{
+ stmt_ann_t ann;
+ stmt_operands_t old_operands;
+
+ /* The optimizers cannot handle statements that are nothing but a
+ _DECL. This indicates a bug in the gimplifier. */
+ gcc_assert (!SSA_VAR_P (stmt));
+
+ /* Ignore error statements. */
+ if (TREE_CODE (stmt) == ERROR_MARK)
+ return;
+
+ ann = get_stmt_ann (stmt);
+
+ /* If the statement has not been modified, the operands are still valid. */
+ if (!ann->modified)
+ return;
- /* Now free the previous virtual ops to memory. */
- free_v_may_defs (&(prev_vops.v_may_def_ops), true);
- free_vuses (&(prev_vops.vuse_ops), true);
- free_v_must_defs (&(prev_vops.v_must_def_ops), true);
+ timevar_push (TV_TREE_OPS);
+
+ old_operands = ann->operands;
+ memset (&(ann->operands), 0, sizeof (stmt_operands_t));
+
+ build_ssa_operands (stmt, ann, &old_operands, &(ann->operands));
+ free_ssa_operands (&old_operands);
/* Clear the modified bit for STMT. Subsequent calls to
get_stmt_operands for this statement will do nothing until the
}
-/* Recursively scan the expression pointed by EXPR_P in statement STMT.
- FLAGS is one of the OPF_* constants modifying how to interpret the
- operands found. PREV_VOPS is as in append_v_may_def and append_vuse. */
+/* Recursively scan the expression pointed by EXPR_P in statement referred to
+ by INFO. FLAGS is one of the OPF_* constants modifying how to interpret the
+ operands found. */
static void
-get_expr_operands (tree stmt, tree *expr_p, int flags, voperands_t prev_vops)
+get_expr_operands (tree stmt, tree *expr_p, int flags)
{
enum tree_code code;
- char class;
+ enum tree_code_class class;
tree expr = *expr_p;
+ stmt_ann_t s_ann = stmt_ann (stmt);
if (expr == NULL || expr == error_mark_node)
return;
code = TREE_CODE (expr);
class = TREE_CODE_CLASS (code);
- /* Expressions that make no memory references. */
- if (class == 'c'
- || class == 't'
- || code == BLOCK
- || code == FUNCTION_DECL
- || code == EXC_PTR_EXPR
- || code == FILTER_EXPR
- || code == LABEL_DECL)
- return;
-
- /* We could have the address of a component, array member, etc which
- has interesting variable references. */
- if (code == ADDR_EXPR)
+ switch (code)
{
- enum tree_code subcode = TREE_CODE (TREE_OPERAND (expr, 0));
-
+ case ADDR_EXPR:
+ /* We could have the address of a component, array member,
+ etc which has interesting variable references. */
/* Taking the address of a variable does not represent a
- reference to it, but the fact that STMT takes its address will be
+ reference to it, but the fact that the stmt takes its address will be
of interest to some passes (e.g. alias resolution). */
- add_stmt_operand (expr_p, stmt, 0, NULL);
+ add_stmt_operand (expr_p, s_ann, 0);
/* If the address is invariant, there may be no interesting variable
references inside. */
does not allow non-registers as array indices). */
flags |= opf_no_vops;
- /* Avoid recursion. */
- code = subcode;
- class = TREE_CODE_CLASS (code);
- expr_p = &TREE_OPERAND (expr, 0);
- expr = *expr_p;
- }
-
- /* If we found a variable, add it to DEFS or USES depending on the
- operand flags. */
- if (SSA_VAR_P (expr))
- {
- add_stmt_operand (expr_p, stmt, flags, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
return;
- }
-
- /* Pointer dereferences always represent a use of the base pointer. */
- if (code == INDIRECT_REF)
- {
- tree *pptr = &TREE_OPERAND (expr, 0);
- tree ptr = *pptr;
-
- if (SSA_VAR_P (ptr))
- {
- if (!aliases_computed_p)
- {
- /* If the pointer does not have a memory tag and aliases have not
- been computed yet, mark the statement as having volatile
- operands to prevent DOM from entering it in equivalence tables
- and DCE from killing it. */
- stmt_ann (stmt)->has_volatile_ops = true;
- }
- else
- {
- struct ptr_info_def *pi = NULL;
-
- /* If we have computed aliasing already, check if PTR has
- flow-sensitive points-to information. */
- if (TREE_CODE (ptr) == SSA_NAME
- && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
- && pi->name_mem_tag)
- {
- /* PTR has its own memory tag. Use it. */
- add_stmt_operand (&pi->name_mem_tag, stmt, flags,
- prev_vops);
- }
- else
- {
- /* If PTR is not an SSA_NAME or it doesn't have a name
- tag, use its type memory tag. */
- var_ann_t ann;
-
- /* If we are emitting debugging dumps, display a warning if
- PTR is an SSA_NAME with no flow-sensitive alias
- information. That means that we may need to compute
- aliasing again. */
- if (dump_file
- && TREE_CODE (ptr) == SSA_NAME
- && pi == NULL)
- {
- fprintf (dump_file,
- "NOTE: no flow-sensitive alias info for ");
- print_generic_expr (dump_file, ptr, dump_flags);
- fprintf (dump_file, " in ");
- print_generic_stmt (dump_file, stmt, dump_flags);
- }
- if (TREE_CODE (ptr) == SSA_NAME)
- ptr = SSA_NAME_VAR (ptr);
- ann = var_ann (ptr);
- add_stmt_operand (&ann->type_mem_tag, stmt, flags, prev_vops);
- }
- }
- }
-
- /* If a constant is used as a pointer, we can't generate a real
- operand for it but we mark the statement volatile to prevent
- optimizations from messing things up. */
- else if (TREE_CODE (ptr) == INTEGER_CST)
- {
- stmt_ann (stmt)->has_volatile_ops = true;
- return;
- }
-
- /* Everything else *should* have been folded elsewhere, but users
- are smarter than we in finding ways to write invalid code. We
- cannot just abort here. If we were absolutely certain that we
- do handle all valid cases, then we could just do nothing here.
- That seems optimistic, so attempt to do something logical... */
- else if ((TREE_CODE (ptr) == PLUS_EXPR || TREE_CODE (ptr) == MINUS_EXPR)
- && TREE_CODE (TREE_OPERAND (ptr, 0)) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (ptr, 1)) == INTEGER_CST)
- {
- /* Make sure we know the object is addressable. */
- pptr = &TREE_OPERAND (ptr, 0);
- add_stmt_operand (pptr, stmt, 0, NULL);
-
- /* Mark the object itself with a VUSE. */
- pptr = &TREE_OPERAND (*pptr, 0);
- get_expr_operands (stmt, pptr, flags, prev_vops);
- return;
- }
+ case SSA_NAME:
+ case VAR_DECL:
+ case PARM_DECL:
+ case RESULT_DECL:
+ case CONST_DECL:
+ /* If we found a variable, add it to DEFS or USES depending
+ on the operand flags. */
+ add_stmt_operand (expr_p, s_ann, flags);
+ return;
- /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */
- else
- abort ();
+ case MISALIGNED_INDIRECT_REF:
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags);
+ /* fall through */
- /* Add a USE operand for the base pointer. */
- get_expr_operands (stmt, pptr, opf_none, prev_vops);
+ case ALIGN_INDIRECT_REF:
+ case INDIRECT_REF:
+ get_indirect_ref_operands (stmt, expr, flags);
return;
- }
- /* Treat array references as references to the virtual variable
- representing the array. The virtual variable for an ARRAY_REF
- is the VAR_DECL for the array. */
- if (code == ARRAY_REF)
- {
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ /* Treat array references as references to the virtual variable
+ representing the array. The virtual variable for an ARRAY_REF
+ is the VAR_DECL for the array. */
+
/* Add the virtual variable for the ARRAY_REF to VDEFS or VUSES
according to the value of IS_DEF. Recurse if the LHS of the
ARRAY_REF node is not a regular variable. */
if (SSA_VAR_P (TREE_OPERAND (expr, 0)))
- add_stmt_operand (expr_p, stmt, flags, prev_vops);
+ add_stmt_operand (expr_p, s_ann, flags);
else
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 3), opf_none);
return;
- }
- /* Similarly to arrays, references to compound variables (complex types
- and structures/unions) are globbed.
+ case COMPONENT_REF:
+ case REALPART_EXPR:
+ case IMAGPART_EXPR:
+ /* Similarly to arrays, references to compound variables (complex
+ types and structures/unions) are globbed.
- FIXME: This means that
+ FIXME: This means that
a.x = 6;
a.y = 7;
foo (a.x, a.y);
- will not be constant propagated because the two partial
- definitions to 'a' will kill each other. Note that SRA may be
- able to fix this problem if 'a' can be scalarized. */
- if (code == IMAGPART_EXPR || code == REALPART_EXPR || code == COMPONENT_REF)
- {
+ will not be constant propagated because the two partial
+ definitions to 'a' will kill each other. Note that SRA may be
+ able to fix this problem if 'a' can be scalarized. */
+
/* If the LHS of the compound reference is not a regular variable,
recurse to keep looking for more operands in the subexpression. */
if (SSA_VAR_P (TREE_OPERAND (expr, 0)))
- add_stmt_operand (expr_p, stmt, flags, prev_vops);
+ add_stmt_operand (expr_p, s_ann, flags);
else
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
+ if (code == COMPONENT_REF)
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
return;
- }
- /* Function calls. Add every argument to USES. If the callee is
- neither pure nor const, create a VDEF reference for GLOBAL_VAR
- (See find_vars_r). */
- if (code == CALL_EXPR)
- {
- tree op;
- int call_flags = call_expr_flags (expr);
+ case WITH_SIZE_EXPR:
+ /* WITH_SIZE_EXPR is a pass-through reference to its first argument,
+ and an rvalue reference to its second argument. */
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
+ return;
- /* Find uses in the called function. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none, prev_vops);
+ case CALL_EXPR:
+ get_call_expr_operands (stmt, expr);
+ return;
- for (op = TREE_OPERAND (expr, 1); op; op = TREE_CHAIN (op))
- get_expr_operands (stmt, &TREE_VALUE (op), opf_none, prev_vops);
+ case COND_EXPR:
+ case VEC_COND_EXPR:
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+ return;
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none, prev_vops);
+ case MODIFY_EXPR:
+ {
+ int subflags;
+ tree op;
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
+
+ op = TREE_OPERAND (expr, 0);
+ if (TREE_CODE (op) == WITH_SIZE_EXPR)
+ op = TREE_OPERAND (expr, 0);
+ if (TREE_CODE (op) == ARRAY_REF
+ || TREE_CODE (op) == ARRAY_RANGE_REF
+ || TREE_CODE (op) == COMPONENT_REF
+ || TREE_CODE (op) == REALPART_EXPR
+ || TREE_CODE (op) == IMAGPART_EXPR)
+ subflags = opf_is_def;
+ else
+ subflags = opf_is_def | opf_kill_def;
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), subflags);
+ return;
+ }
- if (bitmap_first_set_bit (call_clobbered_vars) >= 0)
- {
- /* A 'pure' or a 'const' functions never call clobber anything.
- A 'noreturn' function might, but since we don't return anyway
- there is no point in recording that. */
- if (!(call_flags
- & (ECF_PURE | ECF_CONST | ECF_NORETURN)))
- add_call_clobber_ops (stmt, prev_vops);
- else if (!(call_flags & (ECF_CONST | ECF_NORETURN)))
- add_call_read_ops (stmt, prev_vops);
- }
- else if (!aliases_computed_p)
- stmt_ann (stmt)->has_volatile_ops = true;
+ case CONSTRUCTOR:
+ {
+ /* General aggregate CONSTRUCTORs have been decomposed, but they
+ are still in use as the COMPLEX_EXPR equivalent for vectors. */
+
+ tree t;
+ for (t = TREE_OPERAND (expr, 0); t ; t = TREE_CHAIN (t))
+ get_expr_operands (stmt, &TREE_VALUE (t), opf_none);
+
+ return;
+ }
+ case TRUTH_NOT_EXPR:
+ case BIT_FIELD_REF:
+ case VIEW_CONVERT_EXPR:
+ do_unary:
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
return;
- }
- /* Lists. */
- if (code == TREE_LIST)
- {
- tree op;
+ case TRUTH_AND_EXPR:
+ case TRUTH_OR_EXPR:
+ case TRUTH_XOR_EXPR:
+ case COMPOUND_EXPR:
+ case OBJ_TYPE_REF:
+ do_binary:
+ {
+ tree op0 = TREE_OPERAND (expr, 0);
+ tree op1 = TREE_OPERAND (expr, 1);
- for (op = expr; op; op = TREE_CHAIN (op))
- get_expr_operands (stmt, &TREE_VALUE (op), flags, prev_vops);
+ /* If it would be profitable to swap the operands, then do so to
+ canonicalize the statement, enabling better optimization.
- return;
- }
+ By placing canonicalization of such expressions here we
+ transparently keep statements in canonical form, even
+ when the statement is modified. */
+ if (tree_swap_operands_p (op0, op1, false))
+ {
+ /* For relationals we need to swap the operands
+ and change the code. */
+ if (code == LT_EXPR
+ || code == GT_EXPR
+ || code == LE_EXPR
+ || code == GE_EXPR)
+ {
+ TREE_SET_CODE (expr, swap_tree_comparison (code));
+ TREE_OPERAND (expr, 0) = op1;
+ TREE_OPERAND (expr, 1) = op0;
+ }
+
+ /* For a commutative operator we can just swap the operands. */
+ else if (commutative_tree_code (code))
+ {
+ TREE_OPERAND (expr, 0) = op1;
+ TREE_OPERAND (expr, 1) = op0;
+ }
+ }
- /* Assignments. */
- if (code == MODIFY_EXPR)
- {
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none, prev_vops);
- if (TREE_CODE (TREE_OPERAND (expr, 0)) == ARRAY_REF
- || TREE_CODE (TREE_OPERAND (expr, 0)) == COMPONENT_REF
- || TREE_CODE (TREE_OPERAND (expr, 0)) == REALPART_EXPR
- || TREE_CODE (TREE_OPERAND (expr, 0)) == IMAGPART_EXPR)
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_is_def,
- prev_vops);
- else
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0),
- opf_is_def | opf_kill_def, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags);
+ return;
+ }
+
+ case REALIGN_LOAD_EXPR:
+ {
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags);
+ return;
+ }
+
+ case BLOCK:
+ case FUNCTION_DECL:
+ case EXC_PTR_EXPR:
+ case FILTER_EXPR:
+ case LABEL_DECL:
+ /* Expressions that make no memory references. */
return;
+
+ default:
+ if (class == tcc_unary)
+ goto do_unary;
+ if (class == tcc_binary || class == tcc_comparison)
+ goto do_binary;
+ if (class == tcc_constant || class == tcc_type)
+ return;
}
+ /* If we get here, something has gone wrong. */
+#ifdef ENABLE_CHECKING
+ fprintf (stderr, "unhandled expression in get_expr_operands():\n");
+ debug_tree (expr);
+ fputs ("\n", stderr);
+ internal_error ("internal error");
+#endif
+ gcc_unreachable ();
+}
+
- /* Mark VA_ARG_EXPR nodes as making volatile references. FIXME,
- this is needed because we currently do not gimplify VA_ARG_EXPR
- properly. */
- if (code == VA_ARG_EXPR)
+/* Scan operands in the ASM_EXPR stmt referred to in INFO. */
+
+static void
+get_asm_expr_operands (tree stmt)
+{
+ stmt_ann_t s_ann = stmt_ann (stmt);
+ int noutputs = list_length (ASM_OUTPUTS (stmt));
+ const char **oconstraints
+ = (const char **) alloca ((noutputs) * sizeof (const char *));
+ int i;
+ tree link;
+ const char *constraint;
+ bool allows_mem, allows_reg, is_inout;
+
+ for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
{
- stmt_ann (stmt)->has_volatile_ops = true;
- return;
+ oconstraints[i] = constraint
+ = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+ parse_output_constraint (&constraint, i, 0, 0,
+ &allows_mem, &allows_reg, &is_inout);
+
+ /* This should have been split in gimplify_asm_expr. */
+ gcc_assert (!allows_reg || !is_inout);
+
+ /* Memory operands are addressable. Note that STMT needs the
+ address of this operand. */
+ if (!allows_reg && allows_mem)
+ {
+ tree t = get_base_address (TREE_VALUE (link));
+ if (t && DECL_P (t))
+ note_addressable (t, s_ann);
+ }
+
+ get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def);
}
- /* Unary expressions. */
- if (class == '1'
- || code == TRUTH_NOT_EXPR
- || code == BIT_FIELD_REF
- || code == CONSTRUCTOR)
+ for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
{
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
- return;
+ constraint
+ = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+ parse_input_constraint (&constraint, 0, 0, noutputs, 0,
+ oconstraints, &allows_mem, &allows_reg);
+
+ /* Memory operands are addressable. Note that STMT needs the
+ address of this operand. */
+ if (!allows_reg && allows_mem)
+ {
+ tree t = get_base_address (TREE_VALUE (link));
+ if (t && DECL_P (t))
+ note_addressable (t, s_ann);
+ }
+
+ get_expr_operands (stmt, &TREE_VALUE (link), 0);
}
- /* Binary expressions. */
- if (class == '2'
- || class == '<'
- || code == TRUTH_AND_EXPR
- || code == TRUTH_OR_EXPR
- || code == TRUTH_XOR_EXPR
- || code == COMPOUND_EXPR)
- {
- tree op0 = TREE_OPERAND (expr, 0);
- tree op1 = TREE_OPERAND (expr, 1);
- /* If it would be profitable to swap the operands, then do so to
- canonicalize the statement, enabling better optimization.
+ /* Clobber memory for asm ("" : : : "memory"); */
+ for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
+ if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0)
+ {
+ unsigned i;
+ bitmap_iterator bi;
+
+ /* Clobber all call-clobbered variables (or .GLOBAL_VAR if we
+ decided to group them). */
+ if (global_var)
+ add_stmt_operand (&global_var, s_ann, opf_is_def);
+ else
+ EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi)
+ {
+ tree var = referenced_var (i);
+ add_stmt_operand (&var, s_ann, opf_is_def);
+ }
- By placing canonicalization of such expressions here we
- transparently keep statements in canonical form, even
- when the statement is modified. */
- if (tree_swap_operands_p (op0, op1, false))
- {
- /* For relationals we need to swap the operands and change
- the code. */
- if (code == LT_EXPR
- || code == GT_EXPR
- || code == LE_EXPR
- || code == GE_EXPR)
+ /* Now clobber all addressables. */
+ EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 0, i, bi)
{
- TREE_SET_CODE (expr, swap_tree_comparison (code));
- TREE_OPERAND (expr, 0) = op1;
- TREE_OPERAND (expr, 1) = op0;
+ tree var = referenced_var (i);
+ add_stmt_operand (&var, s_ann, opf_is_def);
}
-
- /* For a commutative operator we can just swap the operands. */
- if (commutative_tree_code (code))
+
+ break;
+ }
+}
+
+/* A subroutine of get_expr_operands to handle INDIRECT_REF,
+ ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF. */
+
+static void
+get_indirect_ref_operands (tree stmt, tree expr, int flags)
+{
+ tree *pptr = &TREE_OPERAND (expr, 0);
+ tree ptr = *pptr;
+ stmt_ann_t s_ann = stmt_ann (stmt);
+
+ /* Stores into INDIRECT_REF operands are never killing definitions. */
+ flags &= ~opf_kill_def;
+
+ if (SSA_VAR_P (ptr))
+ {
+ struct ptr_info_def *pi = NULL;
+
+ /* If PTR has flow-sensitive points-to information, use it. */
+ if (TREE_CODE (ptr) == SSA_NAME
+ && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
+ && pi->name_mem_tag)
+ {
+ /* PTR has its own memory tag. Use it. */
+ add_stmt_operand (&pi->name_mem_tag, s_ann, flags);
+ }
+ else
+ {
+ /* If PTR is not an SSA_NAME or it doesn't have a name
+ tag, use its type memory tag. */
+ var_ann_t v_ann;
+
+ /* If we are emitting debugging dumps, display a warning if
+ PTR is an SSA_NAME with no flow-sensitive alias
+ information. That means that we may need to compute
+ aliasing again. */
+ if (dump_file
+ && TREE_CODE (ptr) == SSA_NAME
+ && pi == NULL)
{
- TREE_OPERAND (expr, 0) = op1;
- TREE_OPERAND (expr, 1) = op0;
+ fprintf (dump_file,
+ "NOTE: no flow-sensitive alias info for ");
+ print_generic_expr (dump_file, ptr, dump_flags);
+ fprintf (dump_file, " in ");
+ print_generic_stmt (dump_file, stmt, dump_flags);
}
+
+ if (TREE_CODE (ptr) == SSA_NAME)
+ ptr = SSA_NAME_VAR (ptr);
+ v_ann = var_ann (ptr);
+ if (v_ann->type_mem_tag)
+ add_stmt_operand (&v_ann->type_mem_tag, s_ann, flags);
}
+ }
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags, prev_vops);
+ /* If a constant is used as a pointer, we can't generate a real
+ operand for it but we mark the statement volatile to prevent
+ optimizations from messing things up. */
+ else if (TREE_CODE (ptr) == INTEGER_CST)
+ {
+ if (s_ann)
+ s_ann->has_volatile_ops = true;
return;
}
- /* If we get here, something has gone wrong. */
- fprintf (stderr, "unhandled expression in get_expr_operands():\n");
- debug_tree (expr);
- fputs ("\n", stderr);
- abort ();
+ /* Everything else *should* have been folded elsewhere, but users
+ are smarter than we in finding ways to write invalid code. We
+ cannot just abort here. If we were absolutely certain that we
+ do handle all valid cases, then we could just do nothing here.
+ That seems optimistic, so attempt to do something logical... */
+ else if ((TREE_CODE (ptr) == PLUS_EXPR || TREE_CODE (ptr) == MINUS_EXPR)
+ && TREE_CODE (TREE_OPERAND (ptr, 0)) == ADDR_EXPR
+ && TREE_CODE (TREE_OPERAND (ptr, 1)) == INTEGER_CST)
+ {
+ /* Make sure we know the object is addressable. */
+ pptr = &TREE_OPERAND (ptr, 0);
+ add_stmt_operand (pptr, s_ann, 0);
+
+ /* Mark the object itself with a VUSE. */
+ pptr = &TREE_OPERAND (*pptr, 0);
+ get_expr_operands (stmt, pptr, flags);
+ return;
+ }
+
+ /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */
+ else
+ gcc_unreachable ();
+
+ /* Add a USE operand for the base pointer. */
+ get_expr_operands (stmt, pptr, opf_none);
+}
+
+/* A subroutine of get_expr_operands to handle CALL_EXPR. */
+
+static void
+get_call_expr_operands (tree stmt, tree expr)
+{
+ tree op;
+ int call_flags = call_expr_flags (expr);
+
+ if (!bitmap_empty_p (call_clobbered_vars))
+ {
+ /* A 'pure' or a 'const' functions never call clobber anything.
+ A 'noreturn' function might, but since we don't return anyway
+ there is no point in recording that. */
+ if (TREE_SIDE_EFFECTS (expr)
+ && !(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN)))
+ add_call_clobber_ops (stmt);
+ else if (!(call_flags & ECF_CONST))
+ add_call_read_ops (stmt);
+ }
+
+ /* Find uses in the called function. */
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none);
+
+ for (op = TREE_OPERAND (expr, 1); op; op = TREE_CHAIN (op))
+ get_expr_operands (stmt, &TREE_VALUE (op), opf_none);
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+
}
-/* Add *VAR_P to the appropriate operand array of STMT. FLAGS is as in
+/* Add *VAR_P to the appropriate operand array for INFO. FLAGS is as in
get_expr_operands. If *VAR_P is a GIMPLE register, it will be added to
the statement's real operands, otherwise it is added to virtual
- operands.
-
- PREV_VOPS is used when adding virtual operands to statements that
- already had them (See append_v_may_def and append_vuse). */
+ operands. */
static void
-add_stmt_operand (tree *var_p, tree stmt, int flags, voperands_t prev_vops)
+add_stmt_operand (tree *var_p, stmt_ann_t s_ann, int flags)
{
bool is_real_op;
tree var, sym;
- stmt_ann_t s_ann;
var_ann_t v_ann;
var = *var_p;
STRIP_NOPS (var);
- s_ann = stmt_ann (stmt);
-
/* If the operand is an ADDR_EXPR, add its operand to the list of
variables that have had their address taken in this statement. */
if (TREE_CODE (var) == ADDR_EXPR)
sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
v_ann = var_ann (sym);
- /* FIXME: We currently refuse to optimize variables that have hidden uses
- (variables used in VLA declarations, MD builtin calls and variables
- from the parent function in nested functions). This is because not
- all uses of these variables are exposed in the IL or the statements
- that reference them are not in GIMPLE form. If that's the case, mark
- the statement as having volatile operands and return. */
- if (v_ann->has_hidden_use)
- {
- s_ann->has_volatile_ops = true;
- return;
- }
-
- /* Don't expose volatile variables to the optimizers. */
- if (TREE_THIS_VOLATILE (sym))
- {
- s_ann->has_volatile_ops = true;
- return;
- }
+ /* Mark statements with volatile operands. Optimizers should back
+ off from statements having volatile operands. */
+ if (TREE_THIS_VOLATILE (sym) && s_ann)
+ s_ann->has_volatile_ops = true;
if (is_real_op)
{
/* The variable is a GIMPLE register. Add it to real operands. */
if (flags & opf_is_def)
- append_def (var_p, stmt);
+ append_def (var_p);
else
- append_use (var_p, stmt);
+ append_use (var_p);
}
else
{
aliases = v_ann->may_aliases;
- /* If alias information hasn't been computed yet, then
- addressable variables will not be an alias tag nor will they
- have aliases. In this case, mark the statement as having
- volatile operands. */
- if (!aliases_computed_p && may_be_aliased (var))
- s_ann->has_volatile_ops = true;
-
if (aliases == NULL)
{
/* The variable is not aliased or it is an alias tag. */
if (flags & opf_is_def)
{
- if (v_ann->is_alias_tag)
- {
- /* Alias tagged vars get regular V_MAY_DEF */
- s_ann->makes_aliased_stores = 1;
- append_v_may_def (var, stmt, prev_vops);
+ if (flags & opf_kill_def)
+ {
+ /* Only regular variables may get a V_MUST_DEF
+ operand. */
+ gcc_assert (v_ann->mem_tag_kind == NOT_A_TAG);
+ /* V_MUST_DEF for non-aliased, non-GIMPLE register
+ variable definitions. */
+ append_v_must_def (var);
}
- else if ((flags & opf_kill_def)
- && v_ann->mem_tag_kind == NOT_A_TAG)
- /* V_MUST_DEF for non-aliased non-GIMPLE register
- variable definitions. Avoid memory tags. */
- append_v_must_def (var, stmt, prev_vops);
else
- /* Call-clobbered variables & memory tags get
- V_MAY_DEF */
- append_v_may_def (var, stmt, prev_vops);
+ {
+ /* Add a V_MAY_DEF for call-clobbered variables and
+ memory tags. */
+ append_v_may_def (var);
+ }
}
else
{
- append_vuse (var, stmt, prev_vops);
- if (v_ann->is_alias_tag)
+ append_vuse (var);
+ if (s_ann && v_ann->is_alias_tag)
s_ann->makes_aliased_loads = 1;
}
}
/* The variable is aliased. Add its aliases to the virtual
operands. */
- if (VARRAY_ACTIVE_SIZE (aliases) == 0)
- abort ();
+ gcc_assert (VARRAY_ACTIVE_SIZE (aliases) != 0);
if (flags & opf_is_def)
{
references to the members of the variable's alias set.
This fixes the bug in gcc.c-torture/execute/20020503-1.c. */
if (v_ann->is_alias_tag)
- append_v_may_def (var, stmt, prev_vops);
+ append_v_may_def (var);
for (i = 0; i < VARRAY_ACTIVE_SIZE (aliases); i++)
- append_v_may_def (VARRAY_TREE (aliases, i), stmt, prev_vops);
+ append_v_may_def (VARRAY_TREE (aliases, i));
- s_ann->makes_aliased_stores = 1;
+ if (s_ann)
+ s_ann->makes_aliased_stores = 1;
}
else
{
+ /* Similarly, append a virtual uses for VAR itself, when
+ it is an alias tag. */
if (v_ann->is_alias_tag)
- append_vuse (var, stmt, prev_vops);
+ append_vuse (var);
for (i = 0; i < VARRAY_ACTIVE_SIZE (aliases); i++)
- append_vuse (VARRAY_TREE (aliases, i), stmt, prev_vops);
+ append_vuse (VARRAY_TREE (aliases, i));
- s_ann->makes_aliased_loads = 1;
+ if (s_ann)
+ s_ann->makes_aliased_loads = 1;
}
}
}
}
+
/* Record that VAR had its address taken in the statement with annotations
S_ANN. */
static void
note_addressable (tree var, stmt_ann_t s_ann)
{
+ if (!s_ann)
+ return;
+
var = get_base_address (var);
if (var && SSA_VAR_P (var))
{
clobbered variables in the function. */
static void
-add_call_clobber_ops (tree stmt, voperands_t prev_vops)
+add_call_clobber_ops (tree stmt)
{
+ unsigned i;
+ tree t;
+ bitmap_iterator bi;
+ stmt_ann_t s_ann = stmt_ann (stmt);
+ struct stmt_ann_d empty_ann;
+
/* Functions that are not const, pure or never return may clobber
call-clobbered variables. */
- stmt_ann (stmt)->makes_clobbering_call = true;
+ if (s_ann)
+ s_ann->makes_clobbering_call = true;
- /* If we had created .GLOBAL_VAR earlier, use it. Otherwise, add
- a V_MAY_DEF operand for every call clobbered variable. See
- compute_may_aliases for the heuristic used to decide whether
- to create .GLOBAL_VAR or not. */
+ /* If we created .GLOBAL_VAR earlier, just use it. See compute_may_aliases
+ for the heuristic used to decide whether to create .GLOBAL_VAR or not. */
if (global_var)
- add_stmt_operand (&global_var, stmt, opf_is_def, prev_vops);
- else
{
- size_t i;
+ add_stmt_operand (&global_var, s_ann, opf_is_def);
+ return;
+ }
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i,
+ /* If cache is valid, copy the elements into the build vectors. */
+ if (ssa_call_clobbered_cache_valid)
+ {
+ for (i = 0; i < VARRAY_ACTIVE_SIZE (clobbered_vuses); i++)
+ {
+ t = VARRAY_TREE (clobbered_vuses, i);
+ gcc_assert (TREE_CODE (t) != SSA_NAME);
+ var_ann (t)->in_vuse_list = 1;
+ VARRAY_PUSH_TREE (build_vuses, t);
+ }
+ for (i = 0; i < VARRAY_ACTIVE_SIZE (clobbered_v_may_defs); i++)
{
- tree var = referenced_var (i);
+ t = VARRAY_TREE (clobbered_v_may_defs, i);
+ gcc_assert (TREE_CODE (t) != SSA_NAME);
+ var_ann (t)->in_v_may_def_list = 1;
+ VARRAY_PUSH_TREE (build_v_may_defs, t);
+ }
+ if (s_ann)
+ {
+ s_ann->makes_aliased_loads = clobbered_aliased_loads;
+ s_ann->makes_aliased_stores = clobbered_aliased_stores;
+ }
+ return;
+ }
- /* If VAR is read-only, don't add a V_MAY_DEF, just a
- VUSE operand. */
- if (!TREE_READONLY (var))
- add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
- else
- add_stmt_operand (&var, stmt, opf_none, prev_vops);
- });
+ memset (&empty_ann, 0, sizeof (struct stmt_ann_d));
+
+ /* Add a V_MAY_DEF operand for every call clobbered variable. */
+ EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi)
+ {
+ tree var = referenced_var (i);
+ if (TREE_READONLY (var)
+ && (TREE_STATIC (var) || DECL_EXTERNAL (var)))
+ add_stmt_operand (&var, &empty_ann, opf_none);
+ else
+ add_stmt_operand (&var, &empty_ann, opf_is_def);
+ }
+
+ clobbered_aliased_loads = empty_ann.makes_aliased_loads;
+ clobbered_aliased_stores = empty_ann.makes_aliased_stores;
+
+ /* Set the flags for a stmt's annotation. */
+ if (s_ann)
+ {
+ s_ann->makes_aliased_loads = empty_ann.makes_aliased_loads;
+ s_ann->makes_aliased_stores = empty_ann.makes_aliased_stores;
+ }
+
+ /* Prepare empty cache vectors. */
+ if (clobbered_v_may_defs)
+ {
+ VARRAY_POP_ALL (clobbered_vuses);
+ VARRAY_POP_ALL (clobbered_v_may_defs);
+ }
+ else
+ {
+ VARRAY_TREE_INIT (clobbered_v_may_defs, 10, "clobbered_v_may_defs");
+ VARRAY_TREE_INIT (clobbered_vuses, 10, "clobbered_vuses");
}
+
+ /* Now fill the clobbered cache with the values that have been found. */
+ for (i = 0; i < VARRAY_ACTIVE_SIZE (build_vuses); i++)
+ VARRAY_PUSH_TREE (clobbered_vuses, VARRAY_TREE (build_vuses, i));
+ for (i = 0; i < VARRAY_ACTIVE_SIZE (build_v_may_defs); i++)
+ VARRAY_PUSH_TREE (clobbered_v_may_defs, VARRAY_TREE (build_v_may_defs, i));
+
+ ssa_call_clobbered_cache_valid = true;
}
function. */
static void
-add_call_read_ops (tree stmt, voperands_t prev_vops)
+add_call_read_ops (tree stmt)
{
- /* Otherwise, if the function is not pure, it may reference memory. Add
- a VUSE for .GLOBAL_VAR if it has been created. Otherwise, add a VUSE
- for each call-clobbered variable. See add_referenced_var for the
- heuristic used to decide whether to create .GLOBAL_VAR. */
+ unsigned i;
+ tree t;
+ bitmap_iterator bi;
+ stmt_ann_t s_ann = stmt_ann (stmt);
+ struct stmt_ann_d empty_ann;
+
+ /* if the function is not pure, it may reference memory. Add
+ a VUSE for .GLOBAL_VAR if it has been created. See add_referenced_var
+ for the heuristic used to decide whether to create .GLOBAL_VAR. */
if (global_var)
- add_stmt_operand (&global_var, stmt, opf_none, prev_vops);
+ {
+ add_stmt_operand (&global_var, s_ann, opf_none);
+ return;
+ }
+
+ /* If cache is valid, copy the elements into the build vector. */
+ if (ssa_ro_call_cache_valid)
+ {
+ for (i = 0; i < VARRAY_ACTIVE_SIZE (ro_call_vuses); i++)
+ {
+ t = VARRAY_TREE (ro_call_vuses, i);
+ gcc_assert (TREE_CODE (t) != SSA_NAME);
+ var_ann (t)->in_vuse_list = 1;
+ VARRAY_PUSH_TREE (build_vuses, t);
+ }
+ if (s_ann)
+ s_ann->makes_aliased_loads = ro_call_aliased_loads;
+ return;
+ }
+
+ memset (&empty_ann, 0, sizeof (struct stmt_ann_d));
+
+ /* Add a VUSE for each call-clobbered variable. */
+ EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi)
+ {
+ tree var = referenced_var (i);
+ add_stmt_operand (&var, &empty_ann, opf_none);
+ }
+
+ ro_call_aliased_loads = empty_ann.makes_aliased_loads;
+ if (s_ann)
+ s_ann->makes_aliased_loads = empty_ann.makes_aliased_loads;
+
+ /* Prepare empty cache vectors. */
+ if (ro_call_vuses)
+ VARRAY_POP_ALL (ro_call_vuses);
else
+ VARRAY_TREE_INIT (ro_call_vuses, 10, "ro_call_vuses");
+
+ /* Now fill the clobbered cache with the values that have been found. */
+ for (i = 0; i < VARRAY_ACTIVE_SIZE (build_vuses); i++)
+ VARRAY_PUSH_TREE (ro_call_vuses, VARRAY_TREE (build_vuses, i));
+
+ ssa_ro_call_cache_valid = true;
+}
+
+/* Copies virtual operands from SRC to DST. */
+
+void
+copy_virtual_operands (tree dst, tree src)
+{
+ unsigned i;
+ vuse_optype vuses = STMT_VUSE_OPS (src);
+ v_may_def_optype v_may_defs = STMT_V_MAY_DEF_OPS (src);
+ v_must_def_optype v_must_defs = STMT_V_MUST_DEF_OPS (src);
+ vuse_optype *vuses_new = &stmt_ann (dst)->operands.vuse_ops;
+ v_may_def_optype *v_may_defs_new = &stmt_ann (dst)->operands.v_may_def_ops;
+ v_must_def_optype *v_must_defs_new = &stmt_ann (dst)->operands.v_must_def_ops;
+
+ if (vuses)
{
- size_t i;
+ *vuses_new = allocate_vuse_optype (NUM_VUSES (vuses));
+ for (i = 0; i < NUM_VUSES (vuses); i++)
+ SET_VUSE_OP (*vuses_new, i, VUSE_OP (vuses, i));
+ }
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i,
+ if (v_may_defs)
+ {
+ *v_may_defs_new = allocate_v_may_def_optype (NUM_V_MAY_DEFS (v_may_defs));
+ for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
{
- tree var = referenced_var (i);
- add_stmt_operand (&var, stmt, opf_none, prev_vops);
- });
+ SET_V_MAY_DEF_OP (*v_may_defs_new, i, V_MAY_DEF_OP (v_may_defs, i));
+ SET_V_MAY_DEF_RESULT (*v_may_defs_new, i,
+ V_MAY_DEF_RESULT (v_may_defs, i));
+ }
+ }
+
+ if (v_must_defs)
+ {
+ *v_must_defs_new = allocate_v_must_def_optype (NUM_V_MUST_DEFS (v_must_defs));
+ for (i = 0; i < NUM_V_MUST_DEFS (v_must_defs); i++)
+ {
+ SET_V_MUST_DEF_RESULT (*v_must_defs_new, i, V_MUST_DEF_RESULT (v_must_defs, i));
+ SET_V_MUST_DEF_KILL (*v_must_defs_new, i, V_MUST_DEF_KILL (v_must_defs, i));
+ }
}
}
+
+/* Specifically for use in DOM's expression analysis. Given a store, we
+ create an artificial stmt which looks like a load from the store, this can
+ be used to eliminate redundant loads. OLD_OPS are the operands from the
+ store stmt, and NEW_STMT is the new load which represents a load of the
+ values stored. */
+
+void
+create_ssa_artficial_load_stmt (stmt_operands_p old_ops, tree new_stmt)
+{
+ stmt_ann_t ann;
+ tree op;
+ stmt_operands_t tmp;
+ unsigned j;
+
+ memset (&tmp, 0, sizeof (stmt_operands_t));
+ ann = get_stmt_ann (new_stmt);
+
+ /* Free operands just in case is was an existing stmt. */
+ free_ssa_operands (&(ann->operands));
+
+ build_ssa_operands (new_stmt, NULL, &tmp, &(ann->operands));
+ free_vuses (&(ann->operands.vuse_ops));
+ free_v_may_defs (&(ann->operands.v_may_def_ops));
+ free_v_must_defs (&(ann->operands.v_must_def_ops));
+
+ /* For each VDEF on the original statement, we want to create a
+ VUSE of the V_MAY_DEF result or V_MUST_DEF op on the new
+ statement. */
+ for (j = 0; j < NUM_V_MAY_DEFS (old_ops->v_may_def_ops); j++)
+ {
+ op = V_MAY_DEF_RESULT (old_ops->v_may_def_ops, j);
+ append_vuse (op);
+ }
+
+ for (j = 0; j < NUM_V_MUST_DEFS (old_ops->v_must_def_ops); j++)
+ {
+ op = V_MUST_DEF_RESULT (old_ops->v_must_def_ops, j);
+ append_vuse (op);
+ }
+
+ /* Now set the vuses for this new stmt. */
+ ann->operands.vuse_ops = finalize_ssa_vuses (&(tmp.vuse_ops));
+}
+
#include "gt-tree-ssa-operands.h"
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