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.
+ found. There are 4 of these routines, each representing one of the
+ 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May 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.
+ on each of the 4 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 it's a perfect
vector for VUSE, then the new vector will also be modified such that
it contains 'a_5' rather than 'a'. */
+
+/* Structure storing statistics on how many call clobbers we have, and
+ how many where avoided. */
+
+static struct
+{
+ /* Number of call-clobbered ops we attempt to add to calls in
+ add_call_clobbered_mem_symbols. */
+ unsigned int clobbered_vars;
+
+ /* Number of write-clobbers (VDEFs) avoided by using
+ not_written information. */
+ unsigned int static_write_clobbers_avoided;
+
+ /* Number of reads (VUSEs) avoided by using not_read information. */
+ unsigned int static_read_clobbers_avoided;
+
+ /* Number of write-clobbers avoided because the variable can't escape to
+ this call. */
+ unsigned int unescapable_clobbers_avoided;
+
+ /* Number of read-only uses we attempt to add to calls in
+ add_call_read_mem_symbols. */
+ unsigned int readonly_clobbers;
+
+ /* Number of read-only uses we avoid using not_read information. */
+ unsigned int static_readonly_clobbers_avoided;
+} clobber_stats;
+
+
/* Flags to describe operand properties in helpers. */
/* By default, operands are loaded. */
-#define opf_none 0
+#define opf_use 0
/* Operand is the target of an assignment expression or a
- call-clobbered variable */
-#define opf_is_def (1 << 0)
-
-/* Operand is the target of an assignment expression. */
-#define opf_kill_def (1 << 1)
+ call-clobbered variable. */
+#define opf_def (1 << 0)
/* 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 << 2)
+#define opf_no_vops (1 << 1)
-/* Operand is a "non-specific" kill for call-clobbers and such. This is used
- to distinguish "reset the world" events from explicit MODIFY_EXPRs. */
-#define opf_non_specific (1 << 3)
+/* Operand is an implicit reference. This is used to distinguish
+ explicit assignments in the form of GIMPLE_MODIFY_STMT from
+ clobbering sites like function calls or ASM_EXPRs. */
+#define opf_implicit (1 << 2)
/* Array for building all the def operands. */
static VEC(tree,heap) *build_defs;
/* Array for building all the use operands. */
static VEC(tree,heap) *build_uses;
-/* Array for building all the v_may_def operands. */
-static VEC(tree,heap) *build_v_may_defs;
+/* Set for building all the VDEF operands. */
+static VEC(tree,heap) *build_vdefs;
-/* Array for building all the vuse operands. */
+/* Set for building all the VUSE operands. */
static VEC(tree,heap) *build_vuses;
-/* Array for building all the v_must_def operands. */
-static VEC(tree,heap) *build_v_must_defs;
+/* Bitmap obstack for our datastructures that needs to survive across
+ compilations of multiple functions. */
+static bitmap_obstack operands_bitmap_obstack;
+/* Set for building all the loaded symbols. */
+static bitmap build_loads;
-/* These arrays are the cached operand vectors for call clobbered calls. */
-static bool ops_active = false;
-
-static GTY (()) struct ssa_operand_memory_d *operand_memory = NULL;
-static unsigned operand_memory_index;
+/* Set for building all the stored symbols. */
+static bitmap build_stores;
static void get_expr_operands (tree, tree *, int);
-static def_optype_p free_defs = NULL;
-static use_optype_p free_uses = NULL;
-static vuse_optype_p free_vuses = NULL;
-static maydef_optype_p free_maydefs = NULL;
-static mustdef_optype_p free_mustdefs = NULL;
+/* Number of functions with initialized ssa_operands. */
+static int n_initialized = 0;
+
+/* Statement change buffer. Data structure used to record state
+ information for statements. This is used to determine what needs
+ to be done in order to update the SSA web after a statement is
+ modified by a pass. If STMT is a statement that has just been
+ created, or needs to be folded via fold_stmt, or anything that
+ changes its physical structure then the pass should:
+
+ 1- Call push_stmt_changes (&stmt) to record the current state of
+ STMT before any modifications are made.
+
+ 2- Make all appropriate modifications to the statement.
+
+ 3- Call pop_stmt_changes (&stmt) to find new symbols that
+ need to be put in SSA form, SSA name mappings for names that
+ have disappeared, recompute invariantness for address
+ expressions, cleanup EH information, etc.
+ If it is possible to determine that the statement was not modified,
+ instead of calling pop_stmt_changes it is quicker to call
+ discard_stmt_changes to avoid the expensive and unnecessary operand
+ re-scan and change comparison. */
+
+struct scb_d
+{
+ /* Pointer to the statement being modified. */
+ tree *stmt_p;
+
+ /* If the statement references memory these are the sets of symbols
+ loaded and stored by the statement. */
+ bitmap loads;
+ bitmap stores;
+};
+
+typedef struct scb_d *scb_t;
+DEF_VEC_P(scb_t);
+DEF_VEC_ALLOC_P(scb_t,heap);
+
+/* Stack of statement change buffers (SCB). Every call to
+ push_stmt_changes pushes a new buffer onto the stack. Calls to
+ pop_stmt_changes pop a buffer off of the stack and compute the set
+ of changes for the popped statement. */
+static VEC(scb_t,heap) *scb_stack;
/* Return the DECL_UID of the base variable of T. */
operand_build_sort_virtual (VEC(tree,heap) *list)
{
int num = VEC_length (tree, list);
+
if (num < 2)
return;
+
if (num == 2)
{
if (get_name_decl (VEC_index (tree, list, 0))
}
return;
}
+
/* There are 3 or more elements, call qsort. */
qsort (VEC_address (tree, list),
VEC_length (tree, list),
}
-/* Return true if the ssa operands cache is active. */
+/* Return true if the SSA operands cache is active. */
bool
ssa_operands_active (void)
{
- return ops_active;
+ return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active;
}
-/* Structure storing statistics on how many call clobbers we have, and
- how many where avoided. */
+/* VOPs are of variable sized, so the free list maps "free buckets" to the
+ following table:
+ bucket # operands
+ ------ ----------
+ 0 1
+ 1 2
+ ...
+ 15 16
+ 16 17-24
+ 17 25-32
+ 18 31-40
+ ...
+ 29 121-128
+ Any VOPs larger than this are simply added to the largest bucket when they
+ are freed. */
-static struct
+
+/* Return the number of operands used in bucket BUCKET. */
+
+static inline int
+vop_free_bucket_size (int bucket)
{
- /* Number of call-clobbered ops we attempt to add to calls in
- add_call_clobber_ops. */
- unsigned int clobbered_vars;
+#ifdef ENABLE_CHECKING
+ gcc_assert (bucket >= 0 && bucket < NUM_VOP_FREE_BUCKETS);
+#endif
+ if (bucket < 16)
+ return bucket + 1;
+ return (bucket - 13) * 8;
+}
- /* Number of write-clobbers (v_may_defs) avoided by using
- not_written information. */
- unsigned int static_write_clobbers_avoided;
- /* Number of reads (vuses) avoided by using not_read
- information. */
- unsigned int static_read_clobbers_avoided;
-
- /* Number of write-clobbers avoided because the variable can't escape to
- this call. */
- unsigned int unescapable_clobbers_avoided;
+/* For a vop of NUM operands, return the bucket NUM belongs to. If NUM is
+ beyond the end of the bucket table, return -1. */
- /* Number of readonly uses we attempt to add to calls in
- add_call_read_ops. */
- unsigned int readonly_clobbers;
+static inline int
+vop_free_bucket_index (int num)
+{
+ gcc_assert (num > 0);
+
+ /* Sizes 1 through 16 use buckets 0-15. */
+ if (num <= 16)
+ return num - 1;
+ /* Buckets 16 - 45 represent 17 through 256 in 8 unit chunks. */
+ if (num < 256)
+ return 14 + (num - 1) / 8;
+ return -1;
+}
- /* Number of readonly uses we avoid using not_read information. */
- unsigned int static_readonly_clobbers_avoided;
-} clobber_stats;
+
+/* Initialize the VOP free buckets. */
+
+static inline void
+init_vop_buckets (void)
+{
+ int x;
+
+ for (x = 0; x < NUM_VOP_FREE_BUCKETS; x++)
+ gimple_ssa_operands (cfun)->vop_free_buckets[x] = NULL;
+}
+
+
+/* Add PTR to the appropriate VOP bucket. */
+
+static inline void
+add_vop_to_freelist (voptype_p ptr)
+{
+ int bucket = vop_free_bucket_index (VUSE_VECT_NUM_ELEM (ptr->usev));
+
+ /* Too large, use the largest bucket so its not a complete throw away. */
+ if (bucket == -1)
+ bucket = NUM_VOP_FREE_BUCKETS - 1;
+
+ ptr->next = gimple_ssa_operands (cfun)->vop_free_buckets[bucket];
+ gimple_ssa_operands (cfun)->vop_free_buckets[bucket] = ptr;
+}
+
+
+/* These are the sizes of the operand memory buffer which gets allocated each
+ time more operands space is required. The final value is the amount that is
+ allocated every time after that. */
+#define OP_SIZE_INIT 0
+#define OP_SIZE_1 30
+#define OP_SIZE_2 110
+#define OP_SIZE_3 511
/* Initialize the operand cache routines. */
void
init_ssa_operands (void)
{
- build_defs = VEC_alloc (tree, heap, 5);
- build_uses = VEC_alloc (tree, heap, 10);
- build_vuses = VEC_alloc (tree, heap, 25);
- build_v_may_defs = VEC_alloc (tree, heap, 25);
- build_v_must_defs = VEC_alloc (tree, heap, 25);
+ if (!n_initialized++)
+ {
+ build_defs = VEC_alloc (tree, heap, 5);
+ build_uses = VEC_alloc (tree, heap, 10);
+ build_vuses = VEC_alloc (tree, heap, 25);
+ build_vdefs = VEC_alloc (tree, heap, 25);
+ bitmap_obstack_initialize (&operands_bitmap_obstack);
+ build_loads = BITMAP_ALLOC (&operands_bitmap_obstack);
+ build_stores = BITMAP_ALLOC (&operands_bitmap_obstack);
+ scb_stack = VEC_alloc (scb_t, heap, 20);
+ }
- gcc_assert (operand_memory == NULL);
- operand_memory_index = SSA_OPERAND_MEMORY_SIZE;
- ops_active = true;
+ gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL);
+ gcc_assert (gimple_ssa_operands (cfun)->mpt_table == NULL);
+ gimple_ssa_operands (cfun)->operand_memory_index
+ = gimple_ssa_operands (cfun)->ssa_operand_mem_size;
+ gimple_ssa_operands (cfun)->ops_active = true;
memset (&clobber_stats, 0, sizeof (clobber_stats));
-
+ init_vop_buckets ();
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT;
}
fini_ssa_operands (void)
{
struct ssa_operand_memory_d *ptr;
- VEC_free (tree, heap, build_defs);
- VEC_free (tree, heap, build_uses);
- VEC_free (tree, heap, build_v_must_defs);
- VEC_free (tree, heap, build_v_may_defs);
- VEC_free (tree, heap, build_vuses);
- free_defs = NULL;
- free_uses = NULL;
- free_vuses = NULL;
- free_maydefs = NULL;
- free_mustdefs = NULL;
- while ((ptr = operand_memory) != NULL)
+ unsigned ix;
+ tree mpt;
+
+ if (!--n_initialized)
+ {
+ VEC_free (tree, heap, build_defs);
+ VEC_free (tree, heap, build_uses);
+ VEC_free (tree, heap, build_vdefs);
+ VEC_free (tree, heap, build_vuses);
+ BITMAP_FREE (build_loads);
+ BITMAP_FREE (build_stores);
+
+ /* The change buffer stack had better be empty. */
+ gcc_assert (VEC_length (scb_t, scb_stack) == 0);
+ VEC_free (scb_t, heap, scb_stack);
+ scb_stack = NULL;
+ }
+
+ gimple_ssa_operands (cfun)->free_defs = NULL;
+ gimple_ssa_operands (cfun)->free_uses = NULL;
+
+ while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL)
{
- operand_memory = operand_memory->next;
+ gimple_ssa_operands (cfun)->operand_memory
+ = gimple_ssa_operands (cfun)->operand_memory->next;
ggc_free (ptr);
}
- ops_active = false;
-
+ for (ix = 0;
+ VEC_iterate (tree, gimple_ssa_operands (cfun)->mpt_table, ix, mpt);
+ ix++)
+ {
+ if (mpt)
+ BITMAP_FREE (MPT_SYMBOLS (mpt));
+ }
+
+ VEC_free (tree, heap, gimple_ssa_operands (cfun)->mpt_table);
+
+ gimple_ssa_operands (cfun)->ops_active = false;
+
+ if (!n_initialized)
+ bitmap_obstack_release (&operands_bitmap_obstack);
if (dump_file && (dump_flags & TDF_STATS))
{
- fprintf (dump_file, "Original clobbered vars:%d\n",
+ fprintf (dump_file, "Original clobbered vars: %d\n",
clobber_stats.clobbered_vars);
- fprintf (dump_file, "Static write clobbers avoided:%d\n",
+ fprintf (dump_file, "Static write clobbers avoided: %d\n",
clobber_stats.static_write_clobbers_avoided);
- fprintf (dump_file, "Static read clobbers avoided:%d\n",
+ fprintf (dump_file, "Static read clobbers avoided: %d\n",
clobber_stats.static_read_clobbers_avoided);
- fprintf (dump_file, "Unescapable clobbers avoided:%d\n",
+ fprintf (dump_file, "Unescapable clobbers avoided: %d\n",
clobber_stats.unescapable_clobbers_avoided);
- fprintf (dump_file, "Original readonly clobbers:%d\n",
+ fprintf (dump_file, "Original read-only clobbers: %d\n",
clobber_stats.readonly_clobbers);
- fprintf (dump_file, "Static readonly clobbers avoided:%d\n",
+ fprintf (dump_file, "Static read-only clobbers avoided: %d\n",
clobber_stats.static_readonly_clobbers_avoided);
}
}
ssa_operand_alloc (unsigned size)
{
char *ptr;
- if (operand_memory_index + size >= SSA_OPERAND_MEMORY_SIZE)
+
+ if (gimple_ssa_operands (cfun)->operand_memory_index + size
+ >= gimple_ssa_operands (cfun)->ssa_operand_mem_size)
{
struct ssa_operand_memory_d *ptr;
- ptr = GGC_NEW (struct ssa_operand_memory_d);
- ptr->next = operand_memory;
- operand_memory = ptr;
- operand_memory_index = 0;
+
+ if (gimple_ssa_operands (cfun)->ssa_operand_mem_size == OP_SIZE_INIT)
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size
+ = OP_SIZE_1 * sizeof (struct voptype_d);
+ else
+ if (gimple_ssa_operands (cfun)->ssa_operand_mem_size
+ == OP_SIZE_1 * sizeof (struct voptype_d))
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size
+ = OP_SIZE_2 * sizeof (struct voptype_d);
+ else
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size
+ = OP_SIZE_3 * sizeof (struct voptype_d);
+
+ /* Go right to the maximum size if the request is too large. */
+ if (size > gimple_ssa_operands (cfun)->ssa_operand_mem_size)
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size
+ = OP_SIZE_3 * sizeof (struct voptype_d);
+
+ /* Fail if there is not enough space. If there are this many operands
+ required, first make sure there isn't a different problem causing this
+ many operands. If the decision is that this is OK, then we can
+ specially allocate a buffer just for this request. */
+ gcc_assert (size <= gimple_ssa_operands (cfun)->ssa_operand_mem_size);
+
+ ptr = (struct ssa_operand_memory_d *)
+ ggc_alloc (sizeof (struct ssa_operand_memory_d)
+ + gimple_ssa_operands (cfun)->ssa_operand_mem_size - 1);
+ ptr->next = gimple_ssa_operands (cfun)->operand_memory;
+ gimple_ssa_operands (cfun)->operand_memory = ptr;
+ gimple_ssa_operands (cfun)->operand_memory_index = 0;
}
- ptr = &(operand_memory->mem[operand_memory_index]);
- operand_memory_index += size;
+ ptr = &(gimple_ssa_operands (cfun)->operand_memory
+ ->mem[gimple_ssa_operands (cfun)->operand_memory_index]);
+ gimple_ssa_operands (cfun)->operand_memory_index += size;
return ptr;
}
-/* Make sure PTR is in the correct immediate use list. Since uses are simply
- pointers into the stmt TREE, there is no way of telling if anyone has
- changed what this pointer points to via TREE_OPERANDS (exp, 0) = <...>.
- The contents are different, but the pointer is still the same. This
- routine will check to make sure PTR is in the correct list, and if it isn't
- put it in the correct list. We cannot simply check the previous node
- because all nodes in the same stmt might have be changed. */
+/* Allocate a DEF operand. */
-static inline void
-correct_use_link (use_operand_p ptr, tree stmt)
+static inline struct def_optype_d *
+alloc_def (void)
{
- use_operand_p prev;
- tree root;
+ struct def_optype_d *ret;
+ if (gimple_ssa_operands (cfun)->free_defs)
+ {
+ ret = gimple_ssa_operands (cfun)->free_defs;
+ gimple_ssa_operands (cfun)->free_defs
+ = gimple_ssa_operands (cfun)->free_defs->next;
+ }
+ else
+ ret = (struct def_optype_d *)
+ ssa_operand_alloc (sizeof (struct def_optype_d));
+ return ret;
+}
- /* Fold_stmt () may have changed the stmt pointers. */
- if (ptr->stmt != stmt)
- ptr->stmt = stmt;
- prev = ptr->prev;
- if (prev)
+/* Allocate a USE operand. */
+
+static inline struct use_optype_d *
+alloc_use (void)
+{
+ struct use_optype_d *ret;
+ if (gimple_ssa_operands (cfun)->free_uses)
{
- /* Find the root element, making sure we skip any safe iterators. */
- while (prev->use != NULL || prev->stmt == NULL)
- prev = prev->prev;
-
- /* Get the ssa_name of the list the node is in. */
- root = prev->stmt;
- /* If it's the right list, simply return. */
- if (root == *(ptr->use))
- return;
+ ret = gimple_ssa_operands (cfun)->free_uses;
+ gimple_ssa_operands (cfun)->free_uses
+ = gimple_ssa_operands (cfun)->free_uses->next;
}
+ else
+ ret = (struct use_optype_d *)
+ ssa_operand_alloc (sizeof (struct use_optype_d));
+ return ret;
+}
+
+
+/* Allocate a vop with NUM elements. */
+
+static inline struct voptype_d *
+alloc_vop (int num)
+{
+ struct voptype_d *ret = NULL;
+ int alloc_size = 0;
+
+ int bucket = vop_free_bucket_index (num);
+ if (bucket != -1)
+ {
+ /* If there is a free operand, use it. */
+ if (gimple_ssa_operands (cfun)->vop_free_buckets[bucket] != NULL)
+ {
+ ret = gimple_ssa_operands (cfun)->vop_free_buckets[bucket];
+ gimple_ssa_operands (cfun)->vop_free_buckets[bucket] =
+ gimple_ssa_operands (cfun)->vop_free_buckets[bucket]->next;
+ }
+ else
+ alloc_size = vop_free_bucket_size(bucket);
+ }
+ else
+ alloc_size = num;
- /* It is in the wrong list if we reach here. */
- delink_imm_use (ptr);
- link_imm_use (ptr, *(ptr->use));
+ if (alloc_size > 0)
+ ret = (struct voptype_d *)ssa_operand_alloc (
+ sizeof (struct voptype_d) + (alloc_size - 1) * sizeof (vuse_element_t));
+
+ VUSE_VECT_NUM_ELEM (ret->usev) = num;
+ return ret;
}
/* This routine makes sure that PTR is in an immediate use list, and makes
- sure the stmt pointer is set to the current stmt. Virtual uses do not need
- the overhead of correct_use_link since they cannot be directly manipulated
- like a real use can be. (They don't exist in the TREE_OPERAND nodes.) */
+ sure the stmt pointer is set to the current stmt. */
static inline void
set_virtual_use_link (use_operand_p ptr, tree stmt)
{
- /* Fold_stmt () may have changed the stmt pointers. */
+ /* fold_stmt may have changed the stmt pointers. */
if (ptr->stmt != stmt)
ptr->stmt = stmt;
}
-#define FINALIZE_OPBUILD build_defs
-#define FINALIZE_OPBUILD_BASE(I) (tree *)VEC_index (tree, \
- build_defs, (I))
-#define FINALIZE_OPBUILD_ELEM(I) (tree *)VEC_index (tree, \
- build_defs, (I))
-#define FINALIZE_FUNC finalize_ssa_def_ops
-#define FINALIZE_ALLOC alloc_def
-#define FINALIZE_FREE free_defs
-#define FINALIZE_TYPE struct def_optype_d
-#define FINALIZE_ELEM(PTR) ((PTR)->def_ptr)
-#define FINALIZE_OPS DEF_OPS
-#define FINALIZE_BASE(VAR) VAR
-#define FINALIZE_BASE_TYPE tree *
-#define FINALIZE_BASE_ZERO NULL
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) FINALIZE_ELEM (PTR) = (VAL)
-#include "tree-ssa-opfinalize.h"
+/* Adds OP to the list of defs after LAST. */
+static inline def_optype_p
+add_def_op (tree *op, def_optype_p last)
+{
+ def_optype_p new;
-/* This routine will create stmt operands for STMT from the def build list. */
+ new = alloc_def ();
+ DEF_OP_PTR (new) = op;
+ last->next = new;
+ new->next = NULL;
+ return new;
+}
-static void
+
+/* Adds OP to the list of uses of statement STMT after LAST. */
+
+static inline use_optype_p
+add_use_op (tree stmt, tree *op, use_optype_p last)
+{
+ use_optype_p new;
+
+ new = alloc_use ();
+ USE_OP_PTR (new)->use = op;
+ link_imm_use_stmt (USE_OP_PTR (new), *op, stmt);
+ last->next = new;
+ new->next = NULL;
+ return new;
+}
+
+
+/* Return a virtual op pointer with NUM elements which are all initialized to OP
+ and are linked into the immediate uses for STMT. The new vop is appended
+ after PREV. */
+
+static inline voptype_p
+add_vop (tree stmt, tree op, int num, voptype_p prev)
+{
+ voptype_p new;
+ int x;
+
+ new = alloc_vop (num);
+ for (x = 0; x < num; x++)
+ {
+ VUSE_OP_PTR (new, x)->prev = NULL;
+ SET_VUSE_OP (new, x, op);
+ VUSE_OP_PTR (new, x)->use = &new->usev.uses[x].use_var;
+ link_imm_use_stmt (VUSE_OP_PTR (new, x), new->usev.uses[x].use_var, stmt);
+ }
+
+ if (prev)
+ prev->next = new;
+ new->next = NULL;
+ return new;
+}
+
+
+/* Adds OP to the list of vuses of statement STMT after LAST, and moves
+ LAST to the new element. */
+
+static inline voptype_p
+add_vuse_op (tree stmt, tree op, int num, voptype_p last)
+{
+ voptype_p new = add_vop (stmt, op, num, last);
+ VDEF_RESULT (new) = NULL_TREE;
+ return new;
+}
+
+
+/* Adds OP to the list of vdefs of statement STMT after LAST, and moves
+ LAST to the new element. */
+
+static inline voptype_p
+add_vdef_op (tree stmt, tree op, int num, voptype_p last)
+{
+ voptype_p new = add_vop (stmt, op, num, last);
+ VDEF_RESULT (new) = op;
+ return new;
+}
+
+
+/* Reallocate the virtual operand PTR so that it has NUM_ELEM use slots. ROOT
+ is the head of the operand list it belongs to. */
+
+static inline struct voptype_d *
+realloc_vop (struct voptype_d *ptr, int num_elem, struct voptype_d **root)
+{
+ int x, lim;
+ tree stmt, val;
+ struct voptype_d *ret, *tmp;
+
+ if (VUSE_VECT_NUM_ELEM (ptr->usev) == num_elem)
+ return ptr;
+
+ val = VUSE_OP (ptr, 0);
+ if (TREE_CODE (val) == SSA_NAME)
+ val = SSA_NAME_VAR (val);
+
+ stmt = USE_STMT (VUSE_OP_PTR (ptr, 0));
+
+ /* Delink all the existing uses. */
+ for (x = 0; x < VUSE_VECT_NUM_ELEM (ptr->usev); x++)
+ {
+ use_operand_p use_p = VUSE_OP_PTR (ptr, x);
+ delink_imm_use (use_p);
+ }
+
+ /* If we want less space, simply use this one, and shrink the size. */
+ if (VUSE_VECT_NUM_ELEM (ptr->usev) > num_elem)
+ {
+ VUSE_VECT_NUM_ELEM (ptr->usev) = num_elem;
+ return ptr;
+ }
+
+ /* It is growing. Allocate a new one and replace the old one. */
+ ret = add_vuse_op (stmt, val, num_elem, ptr);
+
+ /* Clear PTR and add its memory to the free list. */
+ lim = VUSE_VECT_NUM_ELEM (ptr->usev);
+ memset (ptr, 0,
+ sizeof (struct voptype_d) + sizeof (vuse_element_t) * (lim- 1));
+ add_vop_to_freelist (ptr);
+
+ /* Now simply remove the old one. */
+ if (*root == ptr)
+ {
+ *root = ret;
+ return ret;
+ }
+ else
+ for (tmp = *root;
+ tmp != NULL && tmp->next != ptr;
+ tmp = tmp->next)
+ {
+ tmp->next = ret;
+ return ret;
+ }
+
+ /* The pointer passed in isn't in STMT's VDEF lists. */
+ gcc_unreachable ();
+}
+
+
+/* Reallocate the PTR vdef so that it has NUM_ELEM use slots. */
+
+struct voptype_d *
+realloc_vdef (struct voptype_d *ptr, int num_elem)
+{
+ tree val, stmt;
+ struct voptype_d *ret;
+
+ val = VDEF_RESULT (ptr);
+ stmt = USE_STMT (VDEF_OP_PTR (ptr, 0));
+ ret = realloc_vop (ptr, num_elem, &(VDEF_OPS (stmt)));
+ VDEF_RESULT (ret) = val;
+ return ret;
+}
+
+
+/* Reallocate the PTR vuse so that it has NUM_ELEM use slots. */
+
+struct voptype_d *
+realloc_vuse (struct voptype_d *ptr, int num_elem)
+{
+ tree stmt;
+ struct voptype_d *ret;
+
+ stmt = USE_STMT (VUSE_OP_PTR (ptr, 0));
+ ret = realloc_vop (ptr, num_elem, &(VUSE_OPS (stmt)));
+ return ret;
+}
+
+
+/* Takes elements from build_defs and turns them into def operands of STMT.
+ TODO -- Make build_defs VEC of tree *. */
+
+static inline void
finalize_ssa_defs (tree stmt)
{
+ unsigned new_i;
+ struct def_optype_d new_list;
+ def_optype_p old_ops, last;
unsigned int num = VEC_length (tree, build_defs);
/* There should only be a single real definition per assignment. */
- gcc_assert ((stmt && TREE_CODE (stmt) != MODIFY_EXPR) || num <= 1);
+ gcc_assert ((stmt && TREE_CODE (stmt) != GIMPLE_MODIFY_STMT) || num <= 1);
- /* If there is an old list, often the new list is identical, or close, so
- find the elements at the beginning that are the same as the vector. */
- finalize_ssa_def_ops (stmt);
- VEC_truncate (tree, build_defs, 0);
+ new_list.next = NULL;
+ last = &new_list;
+
+ old_ops = DEF_OPS (stmt);
+
+ new_i = 0;
+
+ /* Check for the common case of 1 def that hasn't changed. */
+ if (old_ops && old_ops->next == NULL && num == 1
+ && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops))
+ return;
+
+ /* If there is anything in the old list, free it. */
+ if (old_ops)
+ {
+ old_ops->next = gimple_ssa_operands (cfun)->free_defs;
+ gimple_ssa_operands (cfun)->free_defs = old_ops;
+ }
+
+ /* If there is anything remaining in the build_defs list, simply emit it. */
+ for ( ; new_i < num; new_i++)
+ last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last);
+
+ /* Now set the stmt's operands. */
+ DEF_OPS (stmt) = new_list.next;
+
+#ifdef ENABLE_CHECKING
+ {
+ def_optype_p ptr;
+ unsigned x = 0;
+ for (ptr = DEF_OPS (stmt); ptr; ptr = ptr->next)
+ x++;
+
+ gcc_assert (x == num);
+ }
+#endif
}
-#define FINALIZE_OPBUILD build_uses
-#define FINALIZE_OPBUILD_BASE(I) (tree *)VEC_index (tree, \
- build_uses, (I))
-#define FINALIZE_OPBUILD_ELEM(I) (tree *)VEC_index (tree, \
- build_uses, (I))
-#define FINALIZE_FUNC finalize_ssa_use_ops
-#define FINALIZE_ALLOC alloc_use
-#define FINALIZE_FREE free_uses
-#define FINALIZE_TYPE struct use_optype_d
-#define FINALIZE_ELEM(PTR) ((PTR)->use_ptr.use)
-#define FINALIZE_OPS USE_OPS
-#define FINALIZE_USE_PTR(PTR) USE_OP_PTR (PTR)
-#define FINALIZE_CORRECT_USE correct_use_link
-#define FINALIZE_BASE(VAR) VAR
-#define FINALIZE_BASE_TYPE tree *
-#define FINALIZE_BASE_ZERO NULL
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->use_ptr.use = (VAL); \
- link_imm_use_stmt (&((PTR)->use_ptr), \
- *(VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-
-/* Return a new use operand vector for STMT, comparing to OLD_OPS_P. */
-
-static void
+
+/* Takes elements from build_uses and turns them into use operands of STMT.
+ TODO -- Make build_uses VEC of tree *. */
+
+static inline void
finalize_ssa_uses (tree stmt)
{
+ unsigned new_i;
+ struct use_optype_d new_list;
+ use_optype_p old_ops, ptr, last;
+
#ifdef ENABLE_CHECKING
{
unsigned x;
/* If the pointer to the operand is the statement itself, something is
wrong. It means that we are pointing to a local variable (the
- initial call to get_stmt_operands does not pass a pointer to a
+ initial call to update_stmt_operands does not pass a pointer to a
statement). */
for (x = 0; x < num; x++)
gcc_assert (*((tree *)VEC_index (tree, build_uses, x)) != stmt);
}
#endif
- finalize_ssa_use_ops (stmt);
- VEC_truncate (tree, build_uses, 0);
+
+ new_list.next = NULL;
+ last = &new_list;
+
+ old_ops = USE_OPS (stmt);
+
+ /* If there is anything in the old list, free it. */
+ if (old_ops)
+ {
+ for (ptr = old_ops; ptr; ptr = ptr->next)
+ delink_imm_use (USE_OP_PTR (ptr));
+ old_ops->next = gimple_ssa_operands (cfun)->free_uses;
+ gimple_ssa_operands (cfun)->free_uses = old_ops;
+ }
+
+ /* Now create nodes for all the new nodes. */
+ for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++)
+ last = add_use_op (stmt,
+ (tree *) VEC_index (tree, build_uses, new_i),
+ last);
+
+ /* Now set the stmt's operands. */
+ USE_OPS (stmt) = new_list.next;
+
+#ifdef ENABLE_CHECKING
+ {
+ unsigned x = 0;
+ for (ptr = USE_OPS (stmt); ptr; ptr = ptr->next)
+ x++;
+
+ gcc_assert (x == VEC_length (tree, build_uses));
+ }
+#endif
}
-
-
-/* Return a new v_may_def operand vector for STMT, comparing to OLD_OPS_P. */
-#define FINALIZE_OPBUILD build_v_may_defs
-#define FINALIZE_OPBUILD_ELEM(I) VEC_index (tree, build_v_may_defs, (I))
-#define FINALIZE_OPBUILD_BASE(I) get_name_decl (VEC_index (tree, \
- build_v_may_defs, (I)))
-#define FINALIZE_FUNC finalize_ssa_v_may_def_ops
-#define FINALIZE_ALLOC alloc_maydef
-#define FINALIZE_FREE free_maydefs
-#define FINALIZE_TYPE struct maydef_optype_d
-#define FINALIZE_ELEM(PTR) MAYDEF_RESULT (PTR)
-#define FINALIZE_OPS MAYDEF_OPS
-#define FINALIZE_USE_PTR(PTR) MAYDEF_OP_PTR (PTR)
-#define FINALIZE_CORRECT_USE set_virtual_use_link
-#define FINALIZE_BASE_ZERO 0
-#define FINALIZE_BASE(VAR) get_name_decl (VAR)
-#define FINALIZE_BASE_TYPE unsigned
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->def_var = (VAL); \
- (PTR)->use_var = (VAL); \
- (PTR)->use_ptr.use = &((PTR)->use_var); \
- link_imm_use_stmt (&((PTR)->use_ptr), \
- (VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-
-
-static void
-finalize_ssa_v_may_defs (tree stmt)
+
+
+/* Takes elements from BUILD_VDEFS and turns them into vdef operands of
+ STMT. FIXME, for now VDEF operators should have a single operand
+ in their RHS. */
+
+static inline void
+finalize_ssa_vdefs (tree stmt)
{
- finalize_ssa_v_may_def_ops (stmt);
+ unsigned new_i;
+ struct voptype_d new_list;
+ voptype_p old_ops, ptr, last;
+ stmt_ann_t ann = stmt_ann (stmt);
+
+ /* Set the symbols referenced by STMT. */
+ if (!bitmap_empty_p (build_stores))
+ {
+ if (ann->operands.stores == NULL)
+ ann->operands.stores = BITMAP_ALLOC (&operands_bitmap_obstack);
+
+ bitmap_copy (ann->operands.stores, build_stores);
+ }
+ else
+ BITMAP_FREE (ann->operands.stores);
+
+ /* If aliases have not been computed, do not instantiate a virtual
+ operator on STMT. Initially, we only compute the SSA form on
+ GIMPLE registers. The virtual SSA form is only computed after
+ alias analysis, so virtual operators will remain unrenamed and
+ the verifier will complain. However, alias analysis needs to
+ access symbol load/store information, so we need to compute
+ those. */
+ if (!gimple_aliases_computed_p (cfun))
+ return;
+
+ new_list.next = NULL;
+ last = &new_list;
+
+ old_ops = VDEF_OPS (stmt);
+ new_i = 0;
+ while (old_ops && new_i < VEC_length (tree, build_vdefs))
+ {
+ tree op = VEC_index (tree, build_vdefs, new_i);
+ unsigned new_uid = get_name_decl (op);
+ unsigned old_uid = get_name_decl (VDEF_RESULT (old_ops));
+
+ /* FIXME, for now each VDEF operator should have at most one
+ operand in their RHS. */
+ gcc_assert (VDEF_NUM (old_ops) == 1);
+
+ if (old_uid == new_uid)
+ {
+ /* If the symbols are the same, reuse the existing operand. */
+ last->next = old_ops;
+ last = old_ops;
+ old_ops = old_ops->next;
+ last->next = NULL;
+ set_virtual_use_link (VDEF_OP_PTR (last, 0), stmt);
+ new_i++;
+ }
+ else if (old_uid < new_uid)
+ {
+ /* If old is less than new, old goes to the free list. */
+ voptype_p next;
+ delink_imm_use (VDEF_OP_PTR (old_ops, 0));
+ next = old_ops->next;
+ add_vop_to_freelist (old_ops);
+ old_ops = next;
+ }
+ else
+ {
+ /* This is a new operand. */
+ last = add_vdef_op (stmt, op, 1, last);
+ new_i++;
+ }
+ }
+
+ /* If there is anything remaining in BUILD_VDEFS, simply emit it. */
+ for ( ; new_i < VEC_length (tree, build_vdefs); new_i++)
+ last = add_vdef_op (stmt, VEC_index (tree, build_vdefs, new_i), 1, last);
+
+ /* If there is anything in the old list, free it. */
+ if (old_ops)
+ {
+ for (ptr = old_ops; ptr; ptr = last)
+ {
+ last = ptr->next;
+ delink_imm_use (VDEF_OP_PTR (ptr, 0));
+ add_vop_to_freelist (ptr);
+ }
+ }
+
+ /* Now set STMT's operands. */
+ VDEF_OPS (stmt) = new_list.next;
+
+#ifdef ENABLE_CHECKING
+ {
+ unsigned x = 0;
+ for (ptr = VDEF_OPS (stmt); ptr; ptr = ptr->next)
+ x++;
+
+ gcc_assert (x == VEC_length (tree, build_vdefs));
+ }
+#endif
}
-
-/* Clear the in_list bits and empty the build array for v_may_defs. */
+
+/* Takes elements from BUILD_VUSES and turns them into VUSE operands of
+ STMT. */
static inline void
-cleanup_v_may_defs (void)
+finalize_ssa_vuse_ops (tree stmt)
{
- unsigned x, num;
- num = VEC_length (tree, build_v_may_defs);
+ unsigned new_i;
+ int old_i;
+ voptype_p old_ops, last;
+ VEC(tree,heap) *new_ops;
+ stmt_ann_t ann;
- for (x = 0; x < num; x++)
+ /* Set the symbols referenced by STMT. */
+ ann = stmt_ann (stmt);
+ if (!bitmap_empty_p (build_loads))
+ {
+ if (ann->operands.loads == NULL)
+ ann->operands.loads = BITMAP_ALLOC (&operands_bitmap_obstack);
+
+ bitmap_copy (ann->operands.loads, build_loads);
+ }
+ else
+ BITMAP_FREE (ann->operands.loads);
+
+ /* If aliases have not been computed, do not instantiate a virtual
+ operator on STMT. Initially, we only compute the SSA form on
+ GIMPLE registers. The virtual SSA form is only computed after
+ alias analysis, so virtual operators will remain unrenamed and
+ the verifier will complain. However, alias analysis needs to
+ access symbol load/store information, so we need to compute
+ those. */
+ if (!gimple_aliases_computed_p (cfun))
+ return;
+
+ /* STMT should have at most one VUSE operator. */
+ old_ops = VUSE_OPS (stmt);
+ gcc_assert (old_ops == NULL || old_ops->next == NULL);
+
+ new_ops = NULL;
+ new_i = old_i = 0;
+ while (old_ops
+ && old_i < VUSE_NUM (old_ops)
+ && new_i < VEC_length (tree, build_vuses))
{
- tree t = VEC_index (tree, build_v_may_defs, x);
- if (TREE_CODE (t) != SSA_NAME)
+ tree new_op = VEC_index (tree, build_vuses, new_i);
+ tree old_op = VUSE_OP (old_ops, old_i);
+ unsigned new_uid = get_name_decl (new_op);
+ unsigned old_uid = get_name_decl (old_op);
+
+ if (old_uid == new_uid)
+ {
+ /* If the symbols are the same, reuse the existing operand. */
+ VEC_safe_push (tree, heap, new_ops, old_op);
+ new_i++;
+ old_i++;
+ }
+ else if (old_uid < new_uid)
+ {
+ /* If OLD_UID is less than NEW_UID, the old operand has
+ disappeared, skip to the next old operand. */
+ old_i++;
+ }
+ else
{
- var_ann_t ann = var_ann (t);
- ann->in_v_may_def_list = 0;
+ /* This is a new operand. */
+ VEC_safe_push (tree, heap, new_ops, new_op);
+ new_i++;
}
}
- VEC_truncate (tree, build_v_may_defs, 0);
-}
-
-#define FINALIZE_OPBUILD build_vuses
-#define FINALIZE_OPBUILD_ELEM(I) VEC_index (tree, build_vuses, (I))
-#define FINALIZE_OPBUILD_BASE(I) get_name_decl (VEC_index (tree, \
- build_vuses, (I)))
-#define FINALIZE_FUNC finalize_ssa_vuse_ops
-#define FINALIZE_ALLOC alloc_vuse
-#define FINALIZE_FREE free_vuses
-#define FINALIZE_TYPE struct vuse_optype_d
-#define FINALIZE_ELEM(PTR) VUSE_OP (PTR)
-#define FINALIZE_OPS VUSE_OPS
-#define FINALIZE_USE_PTR(PTR) VUSE_OP_PTR (PTR)
-#define FINALIZE_CORRECT_USE set_virtual_use_link
-#define FINALIZE_BASE_ZERO 0
-#define FINALIZE_BASE(VAR) get_name_decl (VAR)
-#define FINALIZE_BASE_TYPE unsigned
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->use_var = (VAL); \
- (PTR)->use_ptr.use = &((PTR)->use_var); \
- link_imm_use_stmt (&((PTR)->use_ptr), \
- (VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-
-
-/* Return a new vuse operand vector, comparing to OLD_OPS_P. */
+ /* If there is anything remaining in the build_vuses list, simply emit it. */
+ for ( ; new_i < VEC_length (tree, build_vuses); new_i++)
+ VEC_safe_push (tree, heap, new_ops, VEC_index (tree, build_vuses, new_i));
+
+ /* If there is anything in the old list, free it. */
+ if (old_ops)
+ {
+ for (old_i = 0; old_i < VUSE_NUM (old_ops); old_i++)
+ delink_imm_use (VUSE_OP_PTR (old_ops, old_i));
+ add_vop_to_freelist (old_ops);
+ VUSE_OPS (stmt) = NULL;
+ }
+
+ /* If there are any operands, instantiate a VUSE operator for STMT. */
+ if (new_ops)
+ {
+ tree op;
+ unsigned i;
+
+ last = add_vuse_op (stmt, NULL, VEC_length (tree, new_ops), NULL);
+
+ for (i = 0; VEC_iterate (tree, new_ops, i, op); i++)
+ SET_USE (VUSE_OP_PTR (last, (int) i), op);
+
+ VUSE_OPS (stmt) = last;
+ }
+
+#ifdef ENABLE_CHECKING
+ {
+ unsigned x;
+
+ if (VUSE_OPS (stmt))
+ {
+ gcc_assert (VUSE_OPS (stmt)->next == NULL);
+ x = VUSE_NUM (VUSE_OPS (stmt));
+ }
+ else
+ x = 0;
+
+ gcc_assert (x == VEC_length (tree, build_vuses));
+ }
+#endif
+}
+
+/* Return a new VUSE operand vector for STMT. */
static void
finalize_ssa_vuses (tree stmt)
{
- unsigned num, num_v_may_defs;
+ unsigned num, num_vdefs;
unsigned vuse_index;
/* 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
- needed because V_MAY_DEFs imply a VUSE of the variable. For instance,
- suppose that variable 'a' is aliased:
+ VDEF operator for a variable 'a', then a VUSE for 'a' is not
+ needed because VDEFs imply a VUSE of the variable. For instance,
+ suppose that variable 'a' is pointed-to by p and q:
# VUSE <a_2>
- # a_3 = V_MAY_DEF <a_2>
- a = a + 1;
-
- The VUSE <a_2> is superfluous because it is implied by the V_MAY_DEF
- operation. */
+ # a_3 = VDEF <a_2>
+ *p = *q;
+ The VUSE <a_2> is superfluous because it is implied by the
+ VDEF operator. */
num = VEC_length (tree, build_vuses);
- num_v_may_defs = VEC_length (tree, build_v_may_defs);
+ num_vdefs = VEC_length (tree, build_vdefs);
- if (num > 0 && num_v_may_defs > 0)
- {
- for (vuse_index = 0; vuse_index < VEC_length (tree, build_vuses); )
- {
- tree vuse;
- vuse = VEC_index (tree, build_vuses, vuse_index);
- if (TREE_CODE (vuse) != SSA_NAME)
- {
- var_ann_t ann = var_ann (vuse);
- ann->in_vuse_list = 0;
- if (ann->in_v_may_def_list)
- {
- VEC_ordered_remove (tree, build_vuses, vuse_index);
- continue;
- }
- }
- vuse_index++;
- }
- }
- else
- /* Clear out the in_list bits. */
- for (vuse_index = 0;
- vuse_index < VEC_length (tree, build_vuses);
- vuse_index++)
+ if (num > 0 && num_vdefs > 0)
+ for (vuse_index = 0; vuse_index < VEC_length (tree, build_vuses); )
{
- tree t = VEC_index (tree, build_vuses, vuse_index);
- if (TREE_CODE (t) != SSA_NAME)
+ tree vuse;
+ vuse = VEC_index (tree, build_vuses, vuse_index);
+ if (TREE_CODE (vuse) != SSA_NAME)
{
- var_ann_t ann = var_ann (t);
+ var_ann_t ann = var_ann (vuse);
ann->in_vuse_list = 0;
+ if (ann->in_vdef_list)
+ {
+ VEC_ordered_remove (tree, build_vuses, vuse_index);
+ continue;
+ }
}
+ vuse_index++;
}
finalize_ssa_vuse_ops (stmt);
- /* The v_may_def build vector wasn't cleaned up because we needed it. */
- cleanup_v_may_defs ();
-
- /* Free the vuses build vector. */
- VEC_truncate (tree, build_vuses, 0);
-
}
-
-/* Return a new v_must_def operand vector for STMT, comparing to OLD_OPS_P. */
-
-#define FINALIZE_OPBUILD build_v_must_defs
-#define FINALIZE_OPBUILD_ELEM(I) VEC_index (tree, build_v_must_defs, (I))
-#define FINALIZE_OPBUILD_BASE(I) get_name_decl (VEC_index (tree, \
- build_v_must_defs, (I)))
-#define FINALIZE_FUNC finalize_ssa_v_must_def_ops
-#define FINALIZE_ALLOC alloc_mustdef
-#define FINALIZE_FREE free_mustdefs
-#define FINALIZE_TYPE struct mustdef_optype_d
-#define FINALIZE_ELEM(PTR) MUSTDEF_RESULT (PTR)
-#define FINALIZE_OPS MUSTDEF_OPS
-#define FINALIZE_USE_PTR(PTR) MUSTDEF_KILL_PTR (PTR)
-#define FINALIZE_CORRECT_USE set_virtual_use_link
-#define FINALIZE_BASE_ZERO 0
-#define FINALIZE_BASE(VAR) get_name_decl (VAR)
-#define FINALIZE_BASE_TYPE unsigned
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->def_var = (VAL); \
- (PTR)->kill_var = (VAL); \
- (PTR)->use_ptr.use = &((PTR)->kill_var);\
- link_imm_use_stmt (&((PTR)->use_ptr), \
- (VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-static void
-finalize_ssa_v_must_defs (tree stmt)
+/* Clear the in_list bits and empty the build array for VDEFs and
+ VUSEs. */
+
+static inline void
+cleanup_build_arrays (void)
{
- /* In the presence of subvars, there may be more than one V_MUST_DEF per
- statement (one for each subvar). It is a bit expensive to verify that
- all must-defs in a statement belong to subvars if there is more than one
- MUST-def, so we don't do it. Suffice to say, if you reach here without
- having subvars, and have num >1, you have hit a bug. */
- finalize_ssa_v_must_def_ops (stmt);
- VEC_truncate (tree, build_v_must_defs, 0);
+ unsigned i;
+ tree t;
+
+ for (i = 0; VEC_iterate (tree, build_vdefs, i, t); i++)
+ if (TREE_CODE (t) != SSA_NAME)
+ var_ann (t)->in_vdef_list = false;
+
+ for (i = 0; VEC_iterate (tree, build_vuses, i, t); i++)
+ if (TREE_CODE (t) != SSA_NAME)
+ var_ann (t)->in_vuse_list = false;
+
+ VEC_truncate (tree, build_vdefs, 0);
+ VEC_truncate (tree, build_vuses, 0);
+ VEC_truncate (tree, build_defs, 0);
+ VEC_truncate (tree, build_uses, 0);
+ bitmap_clear (build_loads);
+ bitmap_clear (build_stores);
}
{
finalize_ssa_defs (stmt);
finalize_ssa_uses (stmt);
- finalize_ssa_v_must_defs (stmt);
- finalize_ssa_v_may_defs (stmt);
+ finalize_ssa_vdefs (stmt);
finalize_ssa_vuses (stmt);
+ cleanup_build_arrays ();
}
gcc_assert (VEC_length (tree, build_defs) == 0);
gcc_assert (VEC_length (tree, build_uses) == 0);
gcc_assert (VEC_length (tree, build_vuses) == 0);
- gcc_assert (VEC_length (tree, build_v_may_defs) == 0);
- gcc_assert (VEC_length (tree, build_v_must_defs) == 0);
+ gcc_assert (VEC_length (tree, build_vdefs) == 0);
+ gcc_assert (bitmap_empty_p (build_loads));
+ gcc_assert (bitmap_empty_p (build_stores));
}
static inline void
append_def (tree *def_p)
{
- VEC_safe_push (tree, heap, build_defs, (tree)def_p);
+ VEC_safe_push (tree, heap, build_defs, (tree) def_p);
}
static inline void
append_use (tree *use_p)
{
- VEC_safe_push (tree, heap, build_uses, (tree)use_p);
+ VEC_safe_push (tree, heap, build_uses, (tree) use_p);
}
-/* Add a new virtual may def for variable VAR to the build array. */
+/* Add VAR to the set of variables that require a VDEF operator. */
static inline void
-append_v_may_def (tree var)
+append_vdef (tree var)
{
+ tree sym;
+
if (TREE_CODE (var) != SSA_NAME)
{
- var_ann_t ann = get_var_ann (var);
+ tree mpt;
+ var_ann_t ann;
+
+ /* If VAR belongs to a memory partition, use it instead of VAR. */
+ mpt = memory_partition (var);
+ if (mpt)
+ var = mpt;
/* Don't allow duplicate entries. */
- if (ann->in_v_may_def_list)
- return;
- ann->in_v_may_def_list = 1;
+ ann = get_var_ann (var);
+ if (ann->in_vdef_list)
+ return;
+
+ ann->in_vdef_list = true;
+ sym = var;
}
+ else
+ sym = SSA_NAME_VAR (var);
- VEC_safe_push (tree, heap, build_v_may_defs, (tree)var);
+ VEC_safe_push (tree, heap, build_vdefs, var);
+ bitmap_set_bit (build_stores, DECL_UID (sym));
}
-/* Add VAR to the list of virtual uses. */
+/* Add VAR to the set of variables that require a VUSE operator. */
static inline void
append_vuse (tree var)
{
+ tree sym;
- /* Don't allow duplicate entries. */
if (TREE_CODE (var) != SSA_NAME)
{
- var_ann_t ann = get_var_ann (var);
-
- if (ann->in_vuse_list || ann->in_v_may_def_list)
- return;
- ann->in_vuse_list = 1;
- }
-
- VEC_safe_push (tree, heap, build_vuses, (tree)var);
-}
+ tree mpt;
+ var_ann_t ann;
+ /* If VAR belongs to a memory partition, use it instead of VAR. */
+ mpt = memory_partition (var);
+ if (mpt)
+ var = mpt;
-/* Add VAR to the list of virtual must definitions for INFO. */
-
-static inline void
-append_v_must_def (tree var)
-{
- unsigned i;
+ /* Don't allow duplicate entries. */
+ ann = get_var_ann (var);
+ if (ann->in_vuse_list || ann->in_vdef_list)
+ return;
- /* Don't allow duplicate entries. */
- for (i = 0; i < VEC_length (tree, build_v_must_defs); i++)
- if (var == VEC_index (tree, build_v_must_defs, i))
- return;
+ ann->in_vuse_list = true;
+ sym = var;
+ }
+ else
+ sym = SSA_NAME_VAR (var);
- VEC_safe_push (tree, heap, build_v_must_defs, (tree)var);
+ VEC_safe_push (tree, heap, build_vuses, var);
+ bitmap_set_bit (build_loads, DECL_UID (sym));
}
/* REF is a tree that contains the entire pointer dereference
expression, if available, or NULL otherwise. ALIAS is the variable
we are asking if REF can access. OFFSET and SIZE come from the
- memory access expression that generated this virtual operand.
- FOR_CLOBBER is true is this is adding a virtual operand for a call
- clobber. */
+ memory access expression that generated this virtual operand. */
static bool
access_can_touch_variable (tree ref, tree alias, HOST_WIDE_INT offset,
HOST_WIDE_INT size)
-{
+{
bool offsetgtz = offset > 0;
unsigned HOST_WIDE_INT uoffset = (unsigned HOST_WIDE_INT) offset;
tree base = ref ? get_base_address (ref) : NULL;
+ /* If ALIAS is .GLOBAL_VAR then the memory reference REF must be
+ using a call-clobbered memory tag. By definition, call-clobbered
+ memory tags can always touch .GLOBAL_VAR. */
+ if (alias == gimple_global_var (cfun))
+ return true;
+
/* If ALIAS is an SFT, it can't be touched if the offset
and size of the access is not overlapping with the SFT offset and
size. This is only true if we are accessing through a pointer
{ return (struct foos *)&foo; }
(taken from 20000623-1.c)
+
+ The docs also say/imply that access through union pointers
+ is legal (but *not* if you take the address of the union member,
+ i.e. the inverse), such that you can do
+
+ typedef union {
+ int d;
+ } U;
+
+ int rv;
+ void breakme()
+ {
+ U *rv0;
+ U *pretmp = (U*)&rv;
+ rv0 = pretmp;
+ rv0->d = 42;
+ }
+ To implement this, we just punt on accesses through union
+ pointers entirely.
*/
else if (ref
&& flag_strict_aliasing
&& TREE_CODE (ref) != INDIRECT_REF
&& !MTAG_P (alias)
+ && (TREE_CODE (base) != INDIRECT_REF
+ || TREE_CODE (TREE_TYPE (base)) != UNION_TYPE)
&& !AGGREGATE_TYPE_P (TREE_TYPE (alias))
&& TREE_CODE (TREE_TYPE (alias)) != COMPLEX_TYPE
- && !POINTER_TYPE_P (TREE_TYPE (alias)))
+ && !var_ann (alias)->is_heapvar
+ /* When the struct has may_alias attached to it, we need not to
+ return true. */
+ && get_alias_set (base))
{
#ifdef ACCESS_DEBUGGING
fprintf (stderr, "Access to ");
sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
v_ann = var_ann (sym);
+ /* Mark the statement as having memory operands. */
+ s_ann->references_memory = true;
+
/* 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 the variable cannot be modified and this is a V_MAY_DEF change
+ /* If the variable cannot be modified and this is a VDEF change
it into a VUSE. This happens when read-only variables are marked
call-clobbered and/or aliased to writable variables. So we only
check that this only happens on non-specific stores.
Note that if this is a specific store, i.e. associated with a
- modify_expr, then we can't suppress the V_MAY_DEF, lest we run
+ GIMPLE_MODIFY_STMT, then we can't suppress the VDEF, lest we run
into validation problems.
This can happen when programs cast away const, leaving us with a
store to read-only memory. If the statement is actually executed
at runtime, then the program is ill formed. If the statement is
not executed then all is well. At the very least, we cannot ICE. */
- if ((flags & opf_non_specific) && unmodifiable_var_p (var))
- flags &= ~(opf_is_def | opf_kill_def);
+ if ((flags & opf_implicit) && unmodifiable_var_p (var))
+ flags &= ~opf_def;
/* The variable is not a GIMPLE register. Add it (or its aliases) to
virtual operands, unless the caller has specifically requested
aliases = v_ann->may_aliases;
if (aliases == NULL)
{
+ if (s_ann && !gimple_aliases_computed_p (cfun))
+ s_ann->has_volatile_ops = true;
/* The variable is not aliased or it is an alias tag. */
- if (flags & opf_is_def)
- {
- if (flags & opf_kill_def)
- {
- /* V_MUST_DEF for non-aliased, non-GIMPLE register
- variable definitions. */
- gcc_assert (!MTAG_P (var)
- || TREE_CODE (var) == STRUCT_FIELD_TAG);
- append_v_must_def (var);
- }
- else
- {
- /* Add a V_MAY_DEF for call-clobbered variables and
- memory tags. */
- append_v_may_def (var);
- }
- }
+ if (flags & opf_def)
+ append_vdef (var);
else
append_vuse (var);
}
operands. */
gcc_assert (VEC_length (tree, aliases) != 0);
- if (flags & opf_is_def)
+ if (flags & opf_def)
{
-
bool none_added = true;
for (i = 0; VEC_iterate (tree, aliases, i, al); i++)
continue;
none_added = false;
- append_v_may_def (al);
+ append_vdef (al);
}
/* If the variable is also an alias tag, add a virtual
This fixes the bug in gcc.c-torture/execute/20020503-1.c.
It is also necessary to add bare defs on clobbers for
- TMT's, so that bare TMT uses caused by pruning all the
+ SMT's, so that bare SMT uses caused by pruning all the
aliases will link up properly with calls. In order to
keep the number of these bare defs we add down to the
- minimum necessary, we keep track of which TMT's were used
- alone in statement defs or vuses. */
+ minimum necessary, we keep track of which SMT's were used
+ alone in statement vdefs or VUSEs. */
if (v_ann->is_aliased
|| none_added
- || (TREE_CODE (var) == TYPE_MEMORY_TAG && for_clobber
- && TMT_USED_ALONE (var)))
+ || (TREE_CODE (var) == SYMBOL_MEMORY_TAG
+ && for_clobber))
{
- /* Every bare tmt def we add should have TMT_USED_ALONE
- set on it, or else we will get the wrong answer on
- clobbers. */
-
- if (none_added && !updating_used_alone && aliases_computed_p
- && TREE_CODE (var) == TYPE_MEMORY_TAG)
- gcc_assert (TMT_USED_ALONE (var));
-
- append_v_may_def (var);
+ append_vdef (var);
}
}
else
static void
add_stmt_operand (tree *var_p, stmt_ann_t s_ann, int flags)
{
- bool is_real_op;
tree var, sym;
var_ann_t v_ann;
- var = *var_p;
- gcc_assert (SSA_VAR_P (var));
-
- is_real_op = is_gimple_reg (var);
-
- /* If this is a real operand, the operand is either an SSA name or a
- decl. Virtual operands may only be decls. */
- gcc_assert (is_real_op || DECL_P (var));
+ gcc_assert (SSA_VAR_P (*var_p) && s_ann);
+ var = *var_p;
sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
v_ann = var_ann (sym);
- /* Mark statements with volatile operands. Optimizers should back
- off from statements having volatile operands. */
- if (TREE_THIS_VOLATILE (sym) && s_ann)
+ /* Mark statements with volatile operands. */
+ if (TREE_THIS_VOLATILE (sym))
s_ann->has_volatile_ops = true;
- if (is_real_op)
+ if (is_gimple_reg (sym))
{
/* The variable is a GIMPLE register. Add it to real operands. */
- if (flags & opf_is_def)
+ if (flags & opf_def)
append_def (var_p);
else
append_use (var_p);
tree ptr = *pptr;
stmt_ann_t s_ann = stmt_ann (stmt);
- /* Stores into INDIRECT_REF operands are never killing definitions. */
- flags &= ~opf_kill_def;
+ s_ann->references_memory = true;
+ if (s_ann && TREE_THIS_VOLATILE (expr))
+ s_ann->has_volatile_ops = true;
if (SSA_VAR_P (ptr))
{
else
{
/* If PTR is not an SSA_NAME or it doesn't have a name
- tag, use its type memory tag. */
+ tag, use its symbol memory tag. */
var_ann_t v_ann;
/* If we are emitting debugging dumps, display a warning if
ptr = SSA_NAME_VAR (ptr);
v_ann = var_ann (ptr);
- if (v_ann->type_mem_tag)
- add_virtual_operand (v_ann->type_mem_tag, s_ann, flags,
+ if (v_ann->symbol_mem_tag)
+ add_virtual_operand (v_ann->symbol_mem_tag, s_ann, flags,
full_ref, offset, size, false);
+ /* Aliasing information is missing; mark statement as volatile so we
+ won't optimize it out too actively. */
+ else if (s_ann && !gimple_aliases_computed_p (cfun)
+ && (flags & opf_def))
+ s_ann->has_volatile_ops = true;
}
}
else if (TREE_CODE (ptr) == INTEGER_CST)
/* If requested, add a USE operand for the base pointer. */
if (recurse_on_base)
- get_expr_operands (stmt, pptr, opf_none);
+ get_expr_operands (stmt, pptr, opf_use);
}
static void
get_tmr_operands (tree stmt, tree expr, int flags)
{
- tree tag = TMR_TAG (expr), ref;
+ tree tag, ref;
HOST_WIDE_INT offset, size, maxsize;
subvar_t svars, sv;
stmt_ann_t s_ann = stmt_ann (stmt);
- /* First record the real operands. */
- get_expr_operands (stmt, &TMR_BASE (expr), opf_none);
- get_expr_operands (stmt, &TMR_INDEX (expr), opf_none);
+ /* This statement references memory. */
+ s_ann->references_memory = 1;
- /* MEM_REFs should never be killing. */
- flags &= ~opf_kill_def;
+ /* First record the real operands. */
+ get_expr_operands (stmt, &TMR_BASE (expr), opf_use);
+ get_expr_operands (stmt, &TMR_INDEX (expr), opf_use);
if (TMR_SYMBOL (expr))
- {
- stmt_ann_t ann = stmt_ann (stmt);
- add_to_addressable_set (TMR_SYMBOL (expr), &ann->addresses_taken);
- }
+ add_to_addressable_set (TMR_SYMBOL (expr), &s_ann->addresses_taken);
+ tag = TMR_TAG (expr);
if (!tag)
{
/* Something weird, so ensure that we will be careful. */
- stmt_ann (stmt)->has_volatile_ops = true;
+ s_ann->has_volatile_ops = true;
return;
}
for (sv = svars; sv; sv = sv->next)
{
bool exact;
+
if (overlap_subvar (offset, maxsize, sv->var, &exact))
- {
- int subvar_flags = flags;
- if (!exact || size != maxsize)
- subvar_flags &= ~opf_kill_def;
- add_stmt_operand (&sv->var, s_ann, subvar_flags);
- }
+ add_stmt_operand (&sv->var, s_ann, flags);
}
}
/* 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)
+ if (gimple_global_var (cfun))
{
- add_stmt_operand (&global_var, s_ann, opf_is_def);
+ tree var = gimple_global_var (cfun);
+ add_stmt_operand (&var, s_ann, opf_def);
return;
}
or write that variable. */
not_read_b = callee ? ipa_reference_get_not_read_global (callee) : NULL;
not_written_b = callee ? ipa_reference_get_not_written_global (callee) : NULL;
- /* Add a V_MAY_DEF operand for every call clobbered variable. */
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, u, bi)
+
+ /* Add a VDEF operand for every call clobbered variable. */
+ EXECUTE_IF_SET_IN_BITMAP (gimple_call_clobbered_vars (cfun), 0, u, bi)
{
tree var = referenced_var_lookup (u);
unsigned int escape_mask = var_ann (var)->escape_mask;
tree call = get_call_expr_in (stmt);
if (call_expr_flags (call) & (ECF_CONST | ECF_PURE))
{
- add_stmt_operand (&var, s_ann, opf_none);
+ add_stmt_operand (&var, s_ann, opf_use);
clobber_stats.unescapable_clobbers_avoided++;
continue;
}
{
clobber_stats.static_write_clobbers_avoided++;
if (!not_read)
- add_stmt_operand (&var, s_ann, opf_none);
+ add_stmt_operand (&var, s_ann, opf_use);
else
clobber_stats.static_read_clobbers_avoided++;
}
else
- add_virtual_operand (var, s_ann, opf_is_def,
- NULL, 0, -1, true);
+ add_virtual_operand (var, s_ann, opf_def, NULL, 0, -1, true);
}
-
}
/* 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)
+ if (gimple_global_var (cfun))
{
- add_stmt_operand (&global_var, s_ann, opf_none);
+ tree var = gimple_global_var (cfun);
+ add_stmt_operand (&var, s_ann, opf_use);
return;
}
not_read_b = callee ? ipa_reference_get_not_read_global (callee) : NULL;
/* Add a VUSE for each call-clobbered variable. */
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, u, bi)
+ EXECUTE_IF_SET_IN_BITMAP (gimple_call_clobbered_vars (cfun), 0, u, bi)
{
tree var = referenced_var (u);
tree real_var = var;
if (TREE_CODE (var) == STRUCT_FIELD_TAG)
real_var = SFT_PARENT_VAR (var);
- not_read = not_read_b ? bitmap_bit_p (not_read_b,
- DECL_UID (real_var)) : false;
+ not_read = not_read_b ? bitmap_bit_p (not_read_b, DECL_UID (real_var))
+ : false;
if (not_read)
{
continue;
}
- add_stmt_operand (&var, s_ann, opf_none | opf_non_specific);
+ add_stmt_operand (&var, s_ann, opf_use | opf_implicit);
}
}
{
tree op;
int call_flags = call_expr_flags (expr);
+ stmt_ann_t ann = stmt_ann (stmt);
- /* If aliases have been computed already, add V_MAY_DEF or V_USE
+ ann->references_memory = true;
+
+ /* If aliases have been computed already, add VDEF or VUSE
operands for all the symbols that have been found to be
- call-clobbered.
-
- Note that if aliases have not been computed, the global effects
- of calls will not be included in the SSA web. This is fine
- because no optimizer should run before aliases have been
- computed. By not bothering with virtual operands for CALL_EXPRs
- we avoid adding superfluous virtual operands, which can be a
- significant compile time sink (See PR 15855). */
- if (aliases_computed_p
- && !bitmap_empty_p (call_clobbered_vars)
+ call-clobbered. */
+ if (gimple_aliases_computed_p (cfun)
&& !(call_flags & ECF_NOVOPS))
{
/* A 'pure' or a 'const' function never call-clobbers anything.
}
/* Find uses in the called function. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_use);
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_VALUE (op), opf_use);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_use);
}
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;
+ stmt_ann_t s_ann;
+ int i, noutputs;
+ const char **oconstraints;
const char *constraint;
bool allows_mem, allows_reg, is_inout;
+ tree link;
+
+ s_ann = stmt_ann (stmt);
+ noutputs = list_length (ASM_OUTPUTS (stmt));
+ oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *));
- for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
+ /* Gather all output operands. */
+ 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);
+ constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+ oconstraints[i] = constraint;
+ 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);
add_to_addressable_set (t, &s_ann->addresses_taken);
}
- get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def);
+ get_expr_operands (stmt, &TREE_VALUE (link), opf_def);
}
+ /* Gather all input operands. */
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);
+ 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. */
get_expr_operands (stmt, &TREE_VALUE (link), 0);
}
-
- /* Clobber memory for asm ("" : : : "memory"); */
+ /* Clobber all memory and addressable symbols 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 | opf_non_specific);
- }
+ s_ann->references_memory = true;
- /* Now clobber all addressables. */
- EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 0, i, bi)
- {
- tree var = referenced_var (i);
-
- /* Subvars are explicitly represented in this list, so
- we don't need the original to be added to the clobber
- ops, but the original *will* be in this list because
- we keep the addressability of the original
- variable up-to-date so we don't screw up the rest of
- the backend. */
- if (var_can_have_subvars (var)
- && get_subvars_for_var (var) != NULL)
- continue;
-
- add_stmt_operand (&var, s_ann, opf_is_def | opf_non_specific);
- }
+ EXECUTE_IF_SET_IN_BITMAP (gimple_call_clobbered_vars (cfun), 0, i, bi)
+ {
+ tree var = referenced_var (i);
+ add_stmt_operand (&var, s_ann, opf_def | opf_implicit);
+ }
+ EXECUTE_IF_SET_IN_BITMAP (gimple_addressable_vars (cfun), 0, i, bi)
+ {
+ tree var = referenced_var (i);
+
+ /* Subvars are explicitly represented in this list, so we
+ don't need the original to be added to the clobber ops,
+ but the original *will* be in this list because we keep
+ the addressability of the original variable up-to-date
+ to avoid confusing the back-end. */
+ if (var_can_have_subvars (var)
+ && get_subvars_for_var (var) != NULL)
+ continue;
+
+ add_stmt_operand (&var, s_ann, opf_def | opf_implicit);
+ }
break;
}
}
+/* Scan operands for the assignment expression EXPR in statement STMT. */
+
+static void
+get_modify_stmt_operands (tree stmt, tree expr)
+{
+ /* First get operands from the RHS. */
+ get_expr_operands (stmt, &GIMPLE_STMT_OPERAND (expr, 1), opf_use);
+
+ /* For the LHS, use a regular definition (opf_def) for GIMPLE
+ registers. If the LHS is a store to memory, we will need
+ a preserving definition (VDEF).
+
+ Preserving definitions are those that modify a part of an
+ aggregate object for which no subvars have been computed (or the
+ reference does not correspond exactly to one of them). Stores
+ through a pointer are also represented with VDEF operators.
+
+ We used to distinguish between preserving and killing definitions.
+ We always emit preserving definitions now. */
+ get_expr_operands (stmt, &GIMPLE_STMT_OPERAND (expr, 0), opf_def);
+}
+
+
/* Recursively scan the expression pointed to by EXPR_P in statement
- referred to by INFO. FLAGS is one of the OPF_* constants modifying
- how to interpret the operands found. */
+ STMT. 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)
case SSA_NAME:
case STRUCT_FIELD_TAG:
- case TYPE_MEMORY_TAG:
+ case SYMBOL_MEMORY_TAG:
case NAME_MEMORY_TAG:
add_stmt_operand (expr_p, s_ann, flags);
return;
{
subvar_t svars;
- /* Add the subvars for a variable if it has subvars, to DEFS
+ /* Add the subvars for a variable, if it has subvars, to DEFS
or USES. Otherwise, add the variable itself. Whether it
goes to USES or DEFS depends on the operand flags. */
if (var_can_have_subvars (expr)
case ALIGN_INDIRECT_REF:
case INDIRECT_REF:
- get_indirect_ref_operands (stmt, expr, flags, NULL_TREE,
- 0, -1, true);
+ get_indirect_ref_operands (stmt, expr, flags, NULL_TREE, 0, -1, true);
return;
case TARGET_MEM_REF:
get_tmr_operands (stmt, expr, flags);
return;
- 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. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
- 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;
-
case ARRAY_REF:
+ case ARRAY_RANGE_REF:
case COMPONENT_REF:
case REALPART_EXPR:
case IMAGPART_EXPR:
{
int subvar_flags = flags;
none = false;
- if (!exact || size != maxsize)
- subvar_flags &= ~opf_kill_def;
add_stmt_operand (&sv->var, s_ann, subvar_flags);
}
}
}
else if (TREE_CODE (ref) == INDIRECT_REF)
{
- get_indirect_ref_operands (stmt, ref, flags, expr,
- offset, maxsize, false);
+ get_indirect_ref_operands (stmt, ref, flags, expr, offset,
+ maxsize, false);
flags |= opf_no_vops;
}
/* Even if we found subvars above we need to ensure to see
immediate uses for d in s.a[d]. In case of s.a having
- a subvar we'd miss it otherwise. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0),
- flags & ~opf_kill_def);
+ a subvar or we would miss it otherwise. */
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
if (code == COMPONENT_REF)
{
if (s_ann && TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1)))
s_ann->has_volatile_ops = true;
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_use);
}
- else if (code == ARRAY_REF)
+ else if (code == ARRAY_REF || code == ARRAY_RANGE_REF)
{
- 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);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_use);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_use);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 3), opf_use);
}
return;
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, 1), opf_use);
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
return;
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);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_use);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_use);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_use);
return;
- 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_RANGE_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;
- }
+ case GIMPLE_MODIFY_STMT:
+ get_modify_stmt_operands (stmt, expr);
+ return;
case CONSTRUCTOR:
{
for (idx = 0;
VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce);
idx++)
- get_expr_operands (stmt, &ce->value, opf_none);
+ get_expr_operands (stmt, &ce->value, opf_use);
return;
}
- case TRUTH_NOT_EXPR:
case BIT_FIELD_REF:
+ case TRUTH_NOT_EXPR:
case VIEW_CONVERT_EXPR:
do_unary:
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
case OMP_PARALLEL:
case OMP_SECTIONS:
case OMP_FOR:
- case OMP_RETURN_EXPR:
case OMP_SINGLE:
case OMP_MASTER:
case OMP_ORDERED:
case OMP_CRITICAL:
+ case OMP_RETURN:
+ case OMP_CONTINUE:
/* Expressions that make no memory references. */
return;
}
-/* Parse STMT looking for operands. OLD_OPS is the original stmt operand
- cache for STMT, if it existed before. When finished, the various build_*
- operand vectors will have potential operands. in them. */
-
+/* Parse STMT looking for operands. When finished, the various
+ build_* operand vectors will have potential operands in them. */
+
static void
parse_ssa_operands (tree stmt)
{
code = TREE_CODE (stmt);
switch (code)
{
- case MODIFY_EXPR:
- /* 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_RANGE_REF
- && TREE_CODE (lhs) != BIT_FIELD_REF)
- lhs_flags |= opf_kill_def;
-
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), lhs_flags);
- }
+ case GIMPLE_MODIFY_STMT:
+ get_modify_stmt_operands (stmt, stmt);
break;
case COND_EXPR:
- get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_none);
+ get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_use);
break;
case SWITCH_EXPR:
- get_expr_operands (stmt, &SWITCH_COND (stmt), opf_none);
+ get_expr_operands (stmt, &SWITCH_COND (stmt), opf_use);
break;
case ASM_EXPR:
break;
case RETURN_EXPR:
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_use);
break;
case GOTO_EXPR:
- get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_none);
+ get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_use);
break;
case LABEL_EXPR:
- get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_none);
+ get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_use);
break;
- /* These nodes contain no variable references. */
case BIND_EXPR:
case CASE_LABEL_EXPR:
case TRY_CATCH_EXPR:
case EH_FILTER_EXPR:
case CATCH_EXPR:
case RESX_EXPR:
- break;
+ /* These nodes contain no variable references. */
+ break;
default:
- /* Notice that if get_expr_operands tries to use &STMT as the operand
- pointer (which may only happen for USE operands), we will fail in
- 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);
+ /* Notice that if get_expr_operands tries to use &STMT as the
+ operand pointer (which may only happen for USE operands), we
+ will fail in add_stmt_operand. 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_use);
break;
}
}
{
stmt_ann_t ann = get_stmt_ann (stmt);
- /* Initially assume that the statement has no volatile operands. */
- if (ann)
- ann->has_volatile_ops = false;
+ /* Initially assume that the statement has no volatile operands and
+ makes no memory references. */
+ ann->has_volatile_ops = false;
+ ann->references_memory = false;
+ /* Just clear the bitmap so we don't end up reallocating it over and over. */
+ if (ann->addresses_taken)
+ bitmap_clear (ann->addresses_taken);
start_ssa_stmt_operands ();
-
parse_ssa_operands (stmt);
operand_build_sort_virtual (build_vuses);
- operand_build_sort_virtual (build_v_may_defs);
- operand_build_sort_virtual (build_v_must_defs);
-
+ operand_build_sort_virtual (build_vdefs);
finalize_ssa_stmt_operands (stmt);
+
+ if (ann->addresses_taken && bitmap_empty_p (ann->addresses_taken))
+ ann->addresses_taken = NULL;
+ /* For added safety, assume that statements with volatile operands
+ also reference memory. */
+ if (ann->has_volatile_ops)
+ ann->references_memory = true;
}
/* Free any operands vectors in OPS. */
+
void
free_ssa_operands (stmt_operands_p ops)
{
ops->def_ops = NULL;
ops->use_ops = NULL;
- ops->maydef_ops = NULL;
- ops->mustdef_ops = NULL;
+ ops->vdef_ops = NULL;
ops->vuse_ops = NULL;
+ BITMAP_FREE (ops->loads);
+ BITMAP_FREE (ops->stores);
}
-/* 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 mark_stmt_modified(). */
+/* Get the operands of statement STMT. */
void
update_stmt_operands (tree stmt)
{
stmt_ann_t ann = get_stmt_ann (stmt);
- /* If get_stmt_operands is called before SSA is initialized, dont
- do anything. */
+ /* If update_stmt_operands is called before SSA is initialized, do
+ nothing. */
if (!ssa_operands_active ())
return;
_DECL. This indicates a bug in the gimplifier. */
gcc_assert (!SSA_VAR_P (stmt));
- gcc_assert (ann->modified);
-
timevar_push (TV_TREE_OPS);
+ gcc_assert (ann->modified);
build_ssa_operands (stmt);
-
- /* Clear the modified bit for STMT. Subsequent calls to
- get_stmt_operands for this statement will do nothing until the
- statement is marked modified by a call to mark_stmt_modified(). */
ann->modified = 0;
timevar_pop (TV_TREE_OPS);
}
-
+
/* Copies virtual operands from SRC to DST. */
void
copy_virtual_operands (tree dest, tree src)
{
- tree t;
- ssa_op_iter iter, old_iter;
- use_operand_p use_p, u2;
- def_operand_p def_p, d2;
-
- build_ssa_operands (dest);
-
- /* Copy all the virtual fields. */
- FOR_EACH_SSA_TREE_OPERAND (t, src, iter, SSA_OP_VUSE)
- append_vuse (t);
- FOR_EACH_SSA_TREE_OPERAND (t, src, iter, SSA_OP_VMAYDEF)
- append_v_may_def (t);
- FOR_EACH_SSA_TREE_OPERAND (t, src, iter, SSA_OP_VMUSTDEF)
- append_v_must_def (t);
-
- if (VEC_length (tree, build_vuses) == 0
- && VEC_length (tree, build_v_may_defs) == 0
- && VEC_length (tree, build_v_must_defs) == 0)
- return;
+ int i, n;
+ voptype_p src_vuses, dest_vuses;
+ voptype_p src_vdefs, dest_vdefs;
+ struct voptype_d vuse;
+ struct voptype_d vdef;
+ stmt_ann_t dest_ann;
- /* Now commit the virtual operands to this stmt. */
- finalize_ssa_v_must_defs (dest);
- finalize_ssa_v_may_defs (dest);
- finalize_ssa_vuses (dest);
+ VDEF_OPS (dest) = NULL;
+ VUSE_OPS (dest) = NULL;
- /* Finally, set the field to the same values as then originals. */
+ dest_ann = get_stmt_ann (dest);
+ BITMAP_FREE (dest_ann->operands.loads);
+ BITMAP_FREE (dest_ann->operands.stores);
-
- t = op_iter_init_tree (&old_iter, src, SSA_OP_VUSE);
- FOR_EACH_SSA_USE_OPERAND (use_p, dest, iter, SSA_OP_VUSE)
+ if (LOADED_SYMS (src))
{
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, t);
- t = op_iter_next_tree (&old_iter);
+ dest_ann->operands.loads = BITMAP_ALLOC (&operands_bitmap_obstack);
+ bitmap_copy (dest_ann->operands.loads, LOADED_SYMS (src));
}
- gcc_assert (op_iter_done (&old_iter));
- op_iter_init_maydef (&old_iter, src, &u2, &d2);
- FOR_EACH_SSA_MAYDEF_OPERAND (def_p, use_p, dest, iter)
+ if (STORED_SYMS (src))
{
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, USE_FROM_PTR (u2));
- SET_DEF (def_p, DEF_FROM_PTR (d2));
- op_iter_next_maymustdef (&u2, &d2, &old_iter);
+ dest_ann->operands.stores = BITMAP_ALLOC (&operands_bitmap_obstack);
+ bitmap_copy (dest_ann->operands.stores, STORED_SYMS (src));
}
- gcc_assert (op_iter_done (&old_iter));
- op_iter_init_mustdef (&old_iter, src, &u2, &d2);
- FOR_EACH_SSA_MUSTDEF_OPERAND (def_p, use_p, dest, iter)
+ /* Copy all the VUSE operators and corresponding operands. */
+ dest_vuses = &vuse;
+ for (src_vuses = VUSE_OPS (src); src_vuses; src_vuses = src_vuses->next)
{
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, USE_FROM_PTR (u2));
- SET_DEF (def_p, DEF_FROM_PTR (d2));
- op_iter_next_maymustdef (&u2, &d2, &old_iter);
+ n = VUSE_NUM (src_vuses);
+ dest_vuses = add_vuse_op (dest, NULL_TREE, n, dest_vuses);
+ for (i = 0; i < n; i++)
+ SET_USE (VUSE_OP_PTR (dest_vuses, i), VUSE_OP (src_vuses, i));
+
+ if (VUSE_OPS (dest) == NULL)
+ VUSE_OPS (dest) = vuse.next;
}
- gcc_assert (op_iter_done (&old_iter));
+ /* Copy all the VDEF operators and corresponding operands. */
+ dest_vdefs = &vdef;
+ for (src_vdefs = VDEF_OPS (src); src_vdefs; src_vdefs = src_vdefs->next)
+ {
+ n = VUSE_NUM (src_vdefs);
+ dest_vdefs = add_vdef_op (dest, NULL_TREE, n, dest_vdefs);
+ VDEF_RESULT (dest_vdefs) = VDEF_RESULT (src_vdefs);
+ for (i = 0; i < n; i++)
+ SET_USE (VUSE_OP_PTR (dest_vdefs, i), VUSE_OP (src_vdefs, i));
+
+ if (VDEF_OPS (dest) == NULL)
+ VDEF_OPS (dest) = vdef.next;
+ }
}
values stored. */
void
-create_ssa_artficial_load_stmt (tree new_stmt, tree old_stmt)
+create_ssa_artificial_load_stmt (tree new_stmt, tree old_stmt)
{
- stmt_ann_t ann;
tree op;
ssa_op_iter iter;
use_operand_p use_p;
- unsigned x;
+ unsigned i;
- ann = get_stmt_ann (new_stmt);
+ get_stmt_ann (new_stmt);
- /* process the stmt looking for operands. */
+ /* Process NEW_STMT looking for operands. */
start_ssa_stmt_operands ();
parse_ssa_operands (new_stmt);
- for (x = 0; x < VEC_length (tree, build_vuses); x++)
- {
- tree t = VEC_index (tree, build_vuses, x);
- if (TREE_CODE (t) != SSA_NAME)
- {
- var_ann_t ann = var_ann (t);
- ann->in_vuse_list = 0;
- }
- }
+ for (i = 0; VEC_iterate (tree, build_vuses, i, op); i++)
+ if (TREE_CODE (op) != SSA_NAME)
+ var_ann (op)->in_vuse_list = false;
- for (x = 0; x < VEC_length (tree, build_v_may_defs); x++)
- {
- tree t = VEC_index (tree, build_v_may_defs, x);
- if (TREE_CODE (t) != SSA_NAME)
- {
- var_ann_t ann = var_ann (t);
- ann->in_v_may_def_list = 0;
- }
- }
+ for (i = 0; VEC_iterate (tree, build_vuses, i, op); i++)
+ if (TREE_CODE (op) != SSA_NAME)
+ var_ann (op)->in_vdef_list = false;
/* Remove any virtual operands that were found. */
- VEC_truncate (tree, build_v_may_defs, 0);
- VEC_truncate (tree, build_v_must_defs, 0);
+ VEC_truncate (tree, build_vdefs, 0);
VEC_truncate (tree, build_vuses, 0);
/* 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_EACH_SSA_TREE_OPERAND (op, old_stmt, iter,
- (SSA_OP_VMAYDEF | SSA_OP_VMUSTDEF))
+ VUSE of the VDEF result operand on the new statement. */
+ FOR_EACH_SSA_TREE_OPERAND (op, old_stmt, iter, SSA_OP_VDEF)
append_vuse (op);
-
- /* Now build the operands for this new stmt. */
+
finalize_ssa_stmt_operands (new_stmt);
/* All uses in this fake stmt must not be in the immediate use lists. */
op0 = *exp0;
op1 = *exp1;
- /* If the operand cache is active, attempt to preserve the relative positions
- of these two operands in their respective immediate use lists. */
+ /* If the operand cache is active, attempt to preserve the relative
+ positions of these two operands in their respective immediate use
+ lists. */
if (ssa_operands_active () && op0 != op1)
{
use_optype_p use0, use1, ptr;
}
/* If both uses don't have operand entries, there isn't much we can do
- at this point. Presumably we dont need to worry about it. */
+ at this point. Presumably we don't need to worry about it. */
if (use0 && use1)
{
tree *tmp = USE_OP_PTR (use1)->use;
/* Scan the immediate_use list for VAR making sure its linked properly.
- return RTUE iof there is a problem. */
+ Return TRUE if there is a problem and emit an error message to F. */
bool
verify_imm_links (FILE *f, tree var)
FOR_EACH_IMM_USE_FAST (use_p, iter, var)
{
- if (!is_gimple_reg (USE_FROM_PTR (use_p)))
- print_generic_stmt (file, USE_STMT (use_p), TDF_VOPS);
+ if (use_p->stmt == NULL && use_p->use == NULL)
+ fprintf (file, "***end of stmt iterator marker***\n");
else
- print_generic_stmt (file, USE_STMT (use_p), TDF_SLIM);
+ if (!is_gimple_reg (USE_FROM_PTR (use_p)))
+ print_generic_stmt (file, USE_STMT (use_p), TDF_VOPS|TDF_MEMSYMS);
+ else
+ print_generic_stmt (file, USE_STMT (use_p), TDF_SLIM);
}
fprintf(file, "\n");
}
dump_immediate_uses (stderr);
}
+
/* Dump def-use edges on stderr. */
void
dump_immediate_uses_for (stderr, var);
}
-#include "gt-tree-ssa-operands.h"
+
+/* Create a new change buffer for the statement pointed by STMT_P and
+ push the buffer into SCB_STACK. Each change buffer
+ records state information needed to determine what changed in the
+ statement. Mainly, this keeps track of symbols that may need to be
+ put into SSA form, SSA name replacements and other information
+ needed to keep the SSA form up to date. */
+
+void
+push_stmt_changes (tree *stmt_p)
+{
+ tree stmt;
+ scb_t buf;
+
+ stmt = *stmt_p;
+
+ /* It makes no sense to keep track of PHI nodes. */
+ if (TREE_CODE (stmt) == PHI_NODE)
+ return;
+
+ buf = xmalloc (sizeof *buf);
+ memset (buf, 0, sizeof *buf);
+
+ buf->stmt_p = stmt_p;
+
+ if (stmt_references_memory_p (stmt))
+ {
+ tree op;
+ ssa_op_iter i;
+
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_VUSE)
+ {
+ tree sym = TREE_CODE (op) == SSA_NAME ? SSA_NAME_VAR (op) : op;
+ if (buf->loads == NULL)
+ buf->loads = BITMAP_ALLOC (NULL);
+ bitmap_set_bit (buf->loads, DECL_UID (sym));
+ }
+
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_VDEF)
+ {
+ tree sym = TREE_CODE (op) == SSA_NAME ? SSA_NAME_VAR (op) : op;
+ if (buf->stores == NULL)
+ buf->stores = BITMAP_ALLOC (NULL);
+ bitmap_set_bit (buf->stores, DECL_UID (sym));
+ }
+ }
+
+ VEC_safe_push (scb_t, heap, scb_stack, buf);
+}
+
+
+/* Given two sets S1 and S2, mark the symbols that differ in S1 and S2
+ for renaming. The set to mark for renaming is (S1 & ~S2) | (S2 & ~S1). */
+
+static void
+mark_difference_for_renaming (bitmap s1, bitmap s2)
+{
+ if (s1 == NULL && s2 == NULL)
+ return;
+
+ if (s1 && s2 == NULL)
+ mark_set_for_renaming (s1);
+ else if (s1 == NULL && s2)
+ mark_set_for_renaming (s2);
+ else if (!bitmap_equal_p (s1, s2))
+ {
+ bitmap t1 = BITMAP_ALLOC (NULL);
+ bitmap t2 = BITMAP_ALLOC (NULL);
+
+ bitmap_and_compl (t1, s1, s2);
+ bitmap_and_compl (t2, s2, s1);
+ bitmap_ior_into (t1, t2);
+ mark_set_for_renaming (t1);
+
+ BITMAP_FREE (t1);
+ BITMAP_FREE (t2);
+ }
+}
+
+
+/* Pop the top SCB from SCB_STACK and act on the differences between
+ what was recorded by push_stmt_changes and the current state of
+ the statement. */
+
+void
+pop_stmt_changes (tree *stmt_p)
+{
+ tree op, stmt;
+ ssa_op_iter iter;
+ bitmap loads, stores;
+ scb_t buf;
+
+ stmt = *stmt_p;
+
+ /* It makes no sense to keep track of PHI nodes. */
+ if (TREE_CODE (stmt) == PHI_NODE)
+ return;
+
+ buf = VEC_pop (scb_t, scb_stack);
+ gcc_assert (stmt_p == buf->stmt_p);
+
+ /* Force an operand re-scan on the statement and mark any newly
+ exposed variables. */
+ update_stmt (stmt);
+
+ /* Determine whether any memory symbols need to be renamed. If the
+ sets of loads and stores are different after the statement is
+ modified, then the affected symbols need to be renamed.
+
+ Note that it may be possible for the statement to not reference
+ memory anymore, but we still need to act on the differences in
+ the sets of symbols. */
+ loads = stores = NULL;
+ if (stmt_references_memory_p (stmt))
+ {
+ tree op;
+ ssa_op_iter i;
+
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_VUSE)
+ {
+ tree sym = TREE_CODE (op) == SSA_NAME ? SSA_NAME_VAR (op) : op;
+ if (loads == NULL)
+ loads = BITMAP_ALLOC (NULL);
+ bitmap_set_bit (loads, DECL_UID (sym));
+ }
+
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_VDEF)
+ {
+ tree sym = TREE_CODE (op) == SSA_NAME ? SSA_NAME_VAR (op) : op;
+ if (stores == NULL)
+ stores = BITMAP_ALLOC (NULL);
+ bitmap_set_bit (stores, DECL_UID (sym));
+ }
+ }
+
+ /* If LOADS is different from BUF->LOADS, the affected
+ symbols need to be marked for renaming. */
+ mark_difference_for_renaming (loads, buf->loads);
+
+ /* Similarly for STORES and BUF->STORES. */
+ mark_difference_for_renaming (stores, buf->stores);
+
+ /* Mark all the naked GIMPLE register operands for renaming. */
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_DEF|SSA_OP_USE)
+ if (DECL_P (op))
+ mark_sym_for_renaming (op);
+
+ /* FIXME, need to add more finalizers here. Cleanup EH info,
+ recompute invariants for address expressions, add
+ SSA replacement mappings, etc. For instance, given
+ testsuite/gcc.c-torture/compile/pr16808.c, we fold a statement of
+ the form:
+
+ # SMT.4_20 = VDEF <SMT.4_16>
+ D.1576_11 = 1.0e+0;
+
+ So, the VDEF will disappear, but instead of marking SMT.4 for
+ renaming it would be far more efficient to establish a
+ replacement mapping that would replace every reference of
+ SMT.4_20 with SMT.4_16. */
+
+ /* Free memory used by the buffer. */
+ BITMAP_FREE (buf->loads);
+ BITMAP_FREE (buf->stores);
+ BITMAP_FREE (loads);
+ BITMAP_FREE (stores);
+ buf->stmt_p = NULL;
+ free (buf);
+}
+
+
+/* Discard the topmost change buffer from SCB_STACK. This is useful
+ when the caller realized that it did not actually modified the
+ statement. It avoids the expensive operand re-scan. */
+
+void
+discard_stmt_changes (tree *stmt_p)
+{
+ scb_t buf;
+ tree stmt;
+
+ /* It makes no sense to keep track of PHI nodes. */
+ stmt = *stmt_p;
+ if (TREE_CODE (stmt) == PHI_NODE)
+ return;
+
+ buf = VEC_pop (scb_t, scb_stack);
+ gcc_assert (stmt_p == buf->stmt_p);
+
+ /* Free memory used by the buffer. */
+ BITMAP_FREE (buf->loads);
+ BITMAP_FREE (buf->stores);
+ buf->stmt_p = NULL;
+ free (buf);
+}
+
+
+/* Returns true if statement STMT may access memory. */
+
+bool
+stmt_references_memory_p (tree stmt)
+{
+ if (!gimple_ssa_operands (cfun)->ops_active || TREE_CODE (stmt) == PHI_NODE)
+ return false;
+
+ return stmt_ann (stmt)->references_memory;
+}
+
+
+/* Return the memory partition tag (MPT) associated with memory
+ symbol SYM. From a correctness standpoint, memory partitions can
+ be assigned in any arbitrary fashion as long as this rule is
+ observed: Given two memory partitions MPT.i and MPT.j, they must
+ not contain symbols in common.
+
+ Memory partitions are used when putting the program into Memory-SSA
+ form. In particular, in Memory-SSA PHI nodes are not computed for
+ individual memory symbols. They are computed for memory
+ partitions. This reduces the amount of PHI nodes in the SSA graph
+ at the expense of precision (i.e., it makes unrelated stores affect
+ each other).
+
+ However, it is possible to increase precision by changing this
+ partitioning scheme. For instance, if the partitioning scheme is
+ such that get_mpt_for is the identity function (that is,
+ get_mpt_for (s) = s), this will result in ultimate precision at the
+ expense of huge SSA webs.
+
+ At the other extreme, a partitioning scheme that groups all the
+ symbols in the same set results in minimal SSA webs and almost
+ total loss of precision. */
+
+tree
+get_mpt_for (tree sym)
+{
+ tree mpt;
+
+ /* Don't create a new tag unnecessarily. */
+ mpt = memory_partition (sym);
+ if (mpt == NULL_TREE)
+ {
+ mpt = create_tag_raw (MEMORY_PARTITION_TAG, TREE_TYPE (sym), "MPT");
+ TREE_ADDRESSABLE (mpt) = 0;
+ MTAG_GLOBAL (mpt) = 1;
+ add_referenced_var (mpt);
+ VEC_safe_push (tree, heap, gimple_ssa_operands (cfun)->mpt_table, mpt);
+ MPT_SYMBOLS (mpt) = BITMAP_ALLOC (&operands_bitmap_obstack);
+ set_memory_partition (sym, mpt);
+ }
+
+ return mpt;
+}
+
+
+/* Dump memory partition information to FILE. */
+
+void
+dump_memory_partitions (FILE *file)
+{
+ unsigned i, npart;
+ unsigned long nsyms;
+ tree mpt;
+
+ fprintf (file, "\nMemory partitions\n\n");
+ for (i = 0, npart = 0, nsyms = 0;
+ VEC_iterate (tree, gimple_ssa_operands (cfun)->mpt_table, i, mpt);
+ i++)
+ {
+ if (mpt)
+ {
+ bitmap syms = MPT_SYMBOLS (mpt);
+ unsigned long n = bitmap_count_bits (syms);
+
+ fprintf (file, "#%u: ", i);
+ print_generic_expr (file, mpt, 0);
+ fprintf (file, ": %lu elements: ", n);
+ dump_decl_set (file, syms);
+ npart++;
+ nsyms += n;
+ }
+ }
+
+ fprintf (file, "\n%u memory partitions holding %lu symbols\n", npart, nsyms);
+}
+
+
+/* Dump memory partition information to stderr. */
+
+void
+debug_memory_partitions (void)
+{
+ dump_memory_partitions (stderr);
+}
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