You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
-#include "errors.h"
#include "ggc.h"
#include "tree.h"
#include "target.h"
Fourier-Motzkin elimination is used to compute the bounds of the base space
of the lattice. */
-/* FIXME: I'm sure the vectors used here could be heap allocated.
- There certainly should be explicit VEC_frees, either way. (nathan
- 2005/04/14) */
-
-DEF_VEC_P(int);
-DEF_VEC_ALLOC_P(int,gc);
+DEF_VEC_I(int);
+DEF_VEC_ALLOC_I(int,heap);
static bool perfect_nestify (struct loops *,
- struct loop *, VEC(tree,gc) *,
- VEC(tree,gc) *, VEC(int,gc) *, VEC(tree,gc) *);
+ struct loop *, VEC(tree,heap) *,
+ VEC(tree,heap) *, VEC(int,heap) *,
+ VEC(tree,heap) *);
/* Lattice stuff that is internal to the code generation algorithm. */
typedef struct
static lambda_linear_expression
gcc_tree_to_linear_expression (int depth, tree expr,
- VEC(tree,gc) *outerinductionvars,
- VEC(tree,gc) *invariants, int extra)
+ VEC(tree,heap) *outerinductionvars,
+ VEC(tree,heap) *invariants, int extra)
{
lambda_linear_expression lle = NULL;
switch (TREE_CODE (expr))
static lambda_loop
gcc_loop_to_lambda_loop (struct loop *loop, int depth,
- VEC(tree,gc) ** invariants,
+ VEC(tree,heap) ** invariants,
tree * ourinductionvar,
- VEC(tree,gc) * outerinductionvars,
- VEC(tree,gc) ** lboundvars,
- VEC(tree,gc) ** uboundvars,
- VEC(int,gc) ** steps)
+ VEC(tree,heap) * outerinductionvars,
+ VEC(tree,heap) ** lboundvars,
+ VEC(tree,heap) ** uboundvars,
+ VEC(int,heap) ** steps)
{
tree phi;
tree exit_cond;
int stepint;
int extra = 0;
tree lboundvar, uboundvar, uboundresult;
- use_optype uses;
/* Find out induction var and exit condition. */
inductionvar = find_induction_var_from_exit_cond (loop);
phi = SSA_NAME_DEF_STMT (inductionvar);
if (TREE_CODE (phi) != PHI_NODE)
{
- uses = STMT_USE_OPS (phi);
-
- if (!uses)
+ phi = SINGLE_SSA_TREE_OPERAND (phi, SSA_OP_USE);
+ if (!phi)
{
if (dump_file && (dump_flags & TDF_DETAILS))
return NULL;
}
- phi = USE_OP (uses, 0);
phi = SSA_NAME_DEF_STMT (phi);
if (TREE_CODE (phi) != PHI_NODE)
{
return NULL;
}
/* One part of the test may be a loop invariant tree. */
+ VEC_reserve (tree, heap, *invariants, 1);
if (TREE_CODE (TREE_OPERAND (test, 1)) == SSA_NAME
&& invariant_in_loop_and_outer_loops (loop, TREE_OPERAND (test, 1)))
- VEC_safe_push (tree, gc, *invariants, TREE_OPERAND (test, 1));
+ VEC_quick_push (tree, *invariants, TREE_OPERAND (test, 1));
else if (TREE_CODE (TREE_OPERAND (test, 0)) == SSA_NAME
&& invariant_in_loop_and_outer_loops (loop, TREE_OPERAND (test, 0)))
- VEC_safe_push (tree, gc, *invariants, TREE_OPERAND (test, 0));
+ VEC_quick_push (tree, *invariants, TREE_OPERAND (test, 0));
/* The non-induction variable part of the test is the upper bound variable.
*/
*invariants, extra);
uboundresult = build (PLUS_EXPR, TREE_TYPE (uboundvar), uboundvar,
build_int_cst (TREE_TYPE (uboundvar), extra));
- VEC_safe_push (tree, gc, *uboundvars, uboundresult);
- VEC_safe_push (tree, gc, *lboundvars, lboundvar);
- VEC_safe_push (int, gc, *steps, stepint);
+ VEC_safe_push (tree, heap, *uboundvars, uboundresult);
+ VEC_safe_push (tree, heap, *lboundvars, lboundvar);
+ VEC_safe_push (int, heap, *steps, stepint);
if (!ubound)
{
if (dump_file && (dump_flags & TDF_DETAILS))
}
DEF_VEC_P(lambda_loop);
-DEF_VEC_ALLOC_P(lambda_loop,gc);
+DEF_VEC_ALLOC_P(lambda_loop,heap);
/* Generate a lambda loopnest from a gcc loopnest LOOP_NEST.
Return the new loop nest.
lambda_loopnest
gcc_loopnest_to_lambda_loopnest (struct loops *currloops,
struct loop * loop_nest,
- VEC(tree,gc) **inductionvars,
- VEC(tree,gc) **invariants,
+ VEC(tree,heap) **inductionvars,
+ VEC(tree,heap) **invariants,
bool need_perfect_nest)
{
- lambda_loopnest ret;
+ lambda_loopnest ret = NULL;
struct loop *temp;
int depth = 0;
size_t i;
- VEC(lambda_loop,gc) *loops = NULL;
- VEC(tree,gc) *uboundvars = NULL;
- VEC(tree,gc) *lboundvars = NULL;
- VEC(int,gc) *steps = NULL;
+ VEC(lambda_loop,heap) *loops = NULL;
+ VEC(tree,heap) *uboundvars = NULL;
+ VEC(tree,heap) *lboundvars = NULL;
+ VEC(int,heap) *steps = NULL;
lambda_loop newloop;
tree inductionvar = NULL;
&steps);
if (!newloop)
return NULL;
- VEC_safe_push (tree, gc, *inductionvars, inductionvar);
- VEC_safe_push (lambda_loop, gc, loops, newloop);
+ VEC_safe_push (tree, heap, *inductionvars, inductionvar);
+ VEC_safe_push (lambda_loop, heap, loops, newloop);
temp = temp->inner;
}
if (need_perfect_nest)
lboundvars, uboundvars, steps, *inductionvars))
{
if (dump_file)
- fprintf (dump_file, "Not a perfect loop nest and couldn't convert to one.\n");
- return NULL;
+ fprintf (dump_file,
+ "Not a perfect loop nest and couldn't convert to one.\n");
+ goto fail;
}
else if (dump_file)
- fprintf (dump_file, "Successfully converted loop nest to perfect loop nest.\n");
-
-
+ fprintf (dump_file,
+ "Successfully converted loop nest to perfect loop nest.\n");
}
ret = lambda_loopnest_new (depth, 2 * depth);
for (i = 0; VEC_iterate (lambda_loop, loops, i, newloop); i++)
LN_LOOPS (ret)[i] = newloop;
-
+ fail:
+ VEC_free (lambda_loop, heap, loops);
+ VEC_free (tree, heap, uboundvars);
+ VEC_free (tree, heap, lboundvars);
+ VEC_free (int, heap, steps);
+
return ret;
-
}
-
/* Convert a lambda body vector LBV to a gcc tree, and return the new tree.
STMTS_TO_INSERT is a pointer to a tree where the statements we need to be
inserted for us are stored. INDUCTION_VARS is the array of induction
static tree
lbv_to_gcc_expression (lambda_body_vector lbv,
- tree type, VEC(tree,gc) *induction_vars,
- tree * stmts_to_insert)
+ tree type, VEC(tree,heap) *induction_vars,
+ tree *stmts_to_insert)
{
tree stmts, stmt, resvar, name;
tree iv;
/* newname = coefficient * induction_variable */
coeffmult = build_int_cst (type, LBV_COEFFICIENTS (lbv)[i]);
stmt = build (MODIFY_EXPR, void_type_node, resvar,
- fold (build (MULT_EXPR, type, iv, coeffmult)));
+ fold_build2 (MULT_EXPR, type, iv, coeffmult));
newname = make_ssa_name (resvar, stmt);
TREE_OPERAND (stmt, 0) = newname;
lle_to_gcc_expression (lambda_linear_expression lle,
lambda_linear_expression offset,
tree type,
- VEC(tree,gc) *induction_vars,
- VEC(tree,gc) *invariants,
- enum tree_code wrap, tree * stmts_to_insert)
+ VEC(tree,heap) *induction_vars,
+ VEC(tree,heap) *invariants,
+ enum tree_code wrap, tree *stmts_to_insert)
{
tree stmts, stmt, resvar, name;
size_t i;
tree_stmt_iterator tsi;
tree iv, invar;
- VEC(tree,gc) *results = NULL;
+ VEC(tree,heap) *results = NULL;
+ gcc_assert (wrap == MAX_EXPR || wrap == MIN_EXPR);
name = NULL_TREE;
/* Create a statement list and a linear expression temporary. */
stmts = alloc_stmt_list ();
{
coeff = build_int_cst (type,
LLE_COEFFICIENTS (lle)[i]);
- mult = fold (build (MULT_EXPR, type, iv, coeff));
+ mult = fold_build2 (MULT_EXPR, type, iv, coeff);
}
/* newname = mult */
else
{
coeff = build_int_cst (type, invcoeff);
- mult = fold (build (MULT_EXPR, type, invar, coeff));
+ mult = fold_build2 (MULT_EXPR, type, invar, coeff);
}
/* newname = mult */
/* Handle any denominator that occurs. */
if (LLE_DENOMINATOR (lle) != 1)
{
- if (wrap == MAX_EXPR)
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (CEIL_DIV_EXPR, type, name,
- build_int_cst (type, LLE_DENOMINATOR (lle))));
- else if (wrap == MIN_EXPR)
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (FLOOR_DIV_EXPR, type, name,
- build_int_cst (type, LLE_DENOMINATOR (lle))));
- else
- gcc_unreachable();
+ stmt = build_int_cst (type, LLE_DENOMINATOR (lle));
+ stmt = build (wrap == MAX_EXPR ? CEIL_DIV_EXPR : FLOOR_DIV_EXPR,
+ type, name, stmt);
+ stmt = build (MODIFY_EXPR, void_type_node, resvar, stmt);
/* name = {ceil, floor}(name/denominator) */
name = make_ssa_name (resvar, stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
}
- VEC_safe_push (tree, gc, results, name);
+ VEC_safe_push (tree, heap, results, name);
}
/* Again, out of laziness, we don't handle this case yet. It's not
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
}
+ VEC_free (tree, heap, results);
+
*stmts_to_insert = stmts;
return name;
}
void
lambda_loopnest_to_gcc_loopnest (struct loop *old_loopnest,
- VEC(tree,gc) *old_ivs,
- VEC(tree,gc) *invariants,
+ VEC(tree,heap) *old_ivs,
+ VEC(tree,heap) *invariants,
lambda_loopnest new_loopnest,
lambda_trans_matrix transform)
{
-
struct loop *temp;
size_t i = 0;
size_t depth = 0;
- VEC(tree,gc) *new_ivs = NULL;
+ VEC(tree,heap) *new_ivs = NULL;
tree oldiv;
block_stmt_iterator bsi;
ivvar = create_tmp_var (type, "lnivtmp");
add_referenced_tmp_var (ivvar);
- VEC_safe_push (tree, gc, new_ivs, ivvar);
+ VEC_safe_push (tree, heap, new_ivs, ivvar);
newloop = LN_LOOPS (new_loopnest)[i];
tree oldiv_def;
tree oldiv_stmt = SSA_NAME_DEF_STMT (oldiv);
- gcc_assert (TREE_CODE (oldiv_stmt) == PHI_NODE
- || NUM_DEFS (STMT_DEF_OPS (oldiv_stmt)) == 1);
if (TREE_CODE (oldiv_stmt) == PHI_NODE)
- oldiv_def = PHI_RESULT (oldiv_stmt);
+ oldiv_def = PHI_RESULT (oldiv_stmt);
else
- oldiv_def = DEF_OP (STMT_DEF_OPS (oldiv_stmt), 0);
+ oldiv_def = SINGLE_SSA_TREE_OPERAND (oldiv_stmt, SSA_OP_DEF);
+ gcc_assert (oldiv_def != NULL_TREE);
FOR_EACH_IMM_USE_SAFE (imm_use, imm_iter, oldiv_def)
{
}
}
}
+ VEC_free (tree, heap, new_ivs);
}
-
-/* Returns true when the vector V is lexicographically positive, in
- other words, when the first nonzero element is positive. */
-
-static bool
-lambda_vector_lexico_pos (lambda_vector v,
- unsigned n)
-{
- unsigned i;
- for (i = 0; i < n; i++)
- {
- if (v[i] == 0)
- continue;
- if (v[i] < 0)
- return false;
- if (v[i] > 0)
- return true;
- }
- return true;
-}
-
-
/* Return TRUE if this is not interesting statement from the perspective of
determining if we have a perfect loop nest. */
static bool
stmt_uses_phi_result (tree stmt, tree phi_result)
{
- use_optype uses = STMT_USE_OPS (stmt);
+ tree use = SINGLE_SSA_TREE_OPERAND (stmt, SSA_OP_USE);
/* This is conservatively true, because we only want SIMPLE bumpers
of the form x +- constant for our pass. */
- if (NUM_USES (uses) != 1)
- return false;
- if (USE_OP (uses, 0) == phi_result)
- return true;
-
- return false;
+ return (use == phi_result);
}
/* STMT is a bumper stmt for LOOP if the version it defines is used in the
{
tree use;
tree def;
- def_optype defs = STMT_DEF_OPS (stmt);
imm_use_iterator iter;
use_operand_p use_p;
- if (NUM_DEFS (defs) != 1)
+ def = SINGLE_SSA_TREE_OPERAND (stmt, SSA_OP_DEF);
+ if (!def)
return false;
- def = DEF_OP (defs, 0);
+
FOR_EACH_IMM_USE_FAST (use_p, iter, def)
{
use = USE_STMT (use_p);
return true;
}
-/* Replace the USES of tree X in STMT with tree Y */
+/* Replace the USES of X in STMT, or uses with the same step as X with Y. */
static void
-replace_uses_of_x_with_y (tree stmt, tree x, tree y)
+replace_uses_equiv_to_x_with_y (struct loop *loop, tree stmt, tree x,
+ int xstep, tree y)
{
- use_optype uses = STMT_USE_OPS (stmt);
- size_t i;
- for (i = 0; i < NUM_USES (uses); i++)
+ ssa_op_iter iter;
+ use_operand_p use_p;
+
+ FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE)
{
- if (USE_OP (uses, i) == x)
- SET_USE_OP (uses, i, y);
+ tree use = USE_FROM_PTR (use_p);
+ tree step = NULL_TREE;
+ tree access_fn = NULL_TREE;
+
+
+ access_fn = instantiate_parameters
+ (loop, analyze_scalar_evolution (loop, use));
+ if (access_fn != NULL_TREE && access_fn != chrec_dont_know)
+ step = evolution_part_in_loop_num (access_fn, loop->num);
+ if ((step && step != chrec_dont_know
+ && TREE_CODE (step) == INTEGER_CST
+ && int_cst_value (step) == xstep)
+ || USE_FROM_PTR (use_p) == x)
+ SET_USE (use_p, y);
}
}
static bool
stmt_uses_op (tree stmt, tree op)
{
- use_optype uses = STMT_USE_OPS (stmt);
- size_t i;
- for (i = 0; i < NUM_USES (uses); i++)
+ ssa_op_iter iter;
+ tree use;
+
+ FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE)
{
- if (USE_OP (uses, i) == op)
+ if (use == op)
return true;
}
return false;
}
+/* Return true if STMT is an exit PHI for LOOP */
+
+static bool
+exit_phi_for_loop_p (struct loop *loop, tree stmt)
+{
+
+ if (TREE_CODE (stmt) != PHI_NODE
+ || PHI_NUM_ARGS (stmt) != 1
+ || bb_for_stmt (stmt) != loop->single_exit->dest)
+ return false;
+
+ return true;
+}
+
+/* Return true if STMT can be put back into INNER, a loop by moving it to the
+ beginning of that loop. */
+
+static bool
+can_put_in_inner_loop (struct loop *inner, tree stmt)
+{
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
+ basic_block use_bb = NULL;
+
+ gcc_assert (TREE_CODE (stmt) == MODIFY_EXPR);
+ if (!ZERO_SSA_OPERANDS (stmt, SSA_OP_ALL_VIRTUALS)
+ || !expr_invariant_in_loop_p (inner, TREE_OPERAND (stmt, 1)))
+ return false;
+
+ /* We require that the basic block of all uses be the same, or the use be an
+ exit phi. */
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, TREE_OPERAND (stmt, 0))
+ {
+ if (!exit_phi_for_loop_p (inner, USE_STMT (use_p)))
+ {
+ basic_block immbb = bb_for_stmt (USE_STMT (use_p));
+
+ if (!flow_bb_inside_loop_p (inner, immbb))
+ return false;
+ if (use_bb == NULL)
+ use_bb = immbb;
+ else if (immbb != use_bb)
+ return false;
+ }
+ }
+ return true;
+
+}
+
+
/* Return TRUE if LOOP is an imperfect nest that we can convert to a perfect
one. LOOPIVS is a vector of induction variables, one per loop.
ATM, we only handle imperfect nests of depth 2, where all of the statements
static bool
can_convert_to_perfect_nest (struct loop *loop,
- VEC(tree,gc) *loopivs)
+ VEC(tree,heap) *loopivs)
{
basic_block *bbs;
tree exit_condition, phi;
if (!loop->inner || loop->inner->inner)
return false;
- /* We only handle moving the after-inner-body statements right now, so make
- sure all the statements we need to move are located in that position. */
bbs = get_loop_body (loop);
exit_condition = get_loop_exit_condition (loop);
for (i = 0; i < loop->num_nodes; i++)
{
size_t j;
tree stmt = bsi_stmt (bsi);
+ tree iv;
+
if (stmt == exit_condition
|| not_interesting_stmt (stmt)
|| stmt_is_bumper_for_loop (loop, stmt))
continue;
/* If the statement uses inner loop ivs, we == screwed. */
- for (j = 1; j < VEC_length (tree, loopivs); j++)
- if (stmt_uses_op (stmt, VEC_index (tree, loopivs, j)))
- {
- free (bbs);
- return false;
- }
+ for (j = 1; VEC_iterate (tree, loopivs, j, iv); j++)
+ if (stmt_uses_op (stmt, iv))
+ goto fail;
- /* If the bb of a statement we care about isn't dominated by
- the header of the inner loop, then we are also screwed. */
+ /* If this is a simple operation like a cast that is invariant
+ in the inner loop, only used there, and we can place it
+ there, then it's not going to hurt us.
+ This means that we will propagate casts and other cheap
+ invariant operations *back*
+ into the inner loop if we can interchange the loop, on the
+ theory that we are going to gain a lot more by interchanging
+ the loop than we are by leaving some invariant code there for
+ some other pass to clean up. */
+ if (TREE_CODE (stmt) == MODIFY_EXPR
+ && is_gimple_cast (TREE_OPERAND (stmt, 1))
+ && can_put_in_inner_loop (loop->inner, stmt))
+ continue;
+
+ /* Otherwise, if the bb of a statement we care about isn't
+ dominated by the header of the inner loop, then we can't
+ handle this case right now. This test ensures that the
+ statement comes completely *after* the inner loop. */
if (!dominated_by_p (CDI_DOMINATORS,
bb_for_stmt (stmt),
loop->inner->header))
- {
- free (bbs);
- return false;
- }
+ goto fail;
}
}
- }
+ }
/* We also need to make sure the loop exit only has simple copy phis in it,
otherwise we don't know how to transform it into a perfect nest right
for (phi = phi_nodes (exitdest); phi; phi = PHI_CHAIN (phi))
if (PHI_NUM_ARGS (phi) != 1)
- return false;
-
+ goto fail;
+
+ free (bbs);
return true;
+
+ fail:
+ free (bbs);
+ return false;
}
/* Transform the loop nest into a perfect nest, if possible.
}
Return FALSE if we can't make this loop into a perfect nest. */
+
static bool
perfect_nestify (struct loops *loops,
struct loop *loop,
- VEC(tree,gc) *lbounds,
- VEC(tree,gc) *ubounds,
- VEC(int,gc) *steps,
- VEC(tree,gc) *loopivs)
+ VEC(tree,heap) *lbounds,
+ VEC(tree,heap) *ubounds,
+ VEC(int,heap) *steps,
+ VEC(tree,heap) *loopivs)
{
basic_block *bbs;
tree exit_condition;
tree then_label, else_label, cond_stmt;
basic_block preheaderbb, headerbb, bodybb, latchbb, olddest;
- size_t i;
+ int i;
block_stmt_iterator bsi;
bool insert_after;
edge e;
tree uboundvar;
tree stmt;
tree oldivvar, ivvar, ivvarinced;
- VEC(tree,gc) *phis = NULL;
+ VEC(tree,heap) *phis = NULL;
if (!can_convert_to_perfect_nest (loop, loopivs))
return false;
/* Push the exit phi nodes that we are moving. */
for (phi = phi_nodes (olddest); phi; phi = PHI_CHAIN (phi))
{
- VEC_reserve (tree, gc, phis, 2);
+ VEC_reserve (tree, heap, phis, 2);
VEC_quick_push (tree, phis, PHI_RESULT (phi));
VEC_quick_push (tree, phis, PHI_ARG_DEF (phi, 0));
}
phiname = VEC_pop (tree, phis);
phi = create_phi_node (phiname, preheaderbb);
add_phi_arg (phi, def, single_pred_edge (preheaderbb));
- }
+ }
flush_pending_stmts (e);
+ VEC_free (tree, heap, phis);
bodybb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
latchbb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
set_immediate_dominator (CDI_DOMINATORS, latchbb, bodybb);
set_immediate_dominator (CDI_DOMINATORS, olddest, bodybb);
/* Create the new iv. */
- ivvar = create_tmp_var (integer_type_node, "perfectiv");
+ oldivvar = VEC_index (tree, loopivs, 0);
+ ivvar = create_tmp_var (TREE_TYPE (oldivvar), "perfectiv");
add_referenced_tmp_var (ivvar);
standard_iv_increment_position (newloop, &bsi, &insert_after);
create_iv (VEC_index (tree, lbounds, 0),
- build_int_cst (integer_type_node, VEC_index (int, steps, 0)),
+ build_int_cst (TREE_TYPE (oldivvar), VEC_index (int, steps, 0)),
ivvar, newloop, &bsi, insert_after, &ivvar, &ivvarinced);
/* Create the new upper bound. This may be not just a variable, so we copy
bsi_insert_after (&bsi, stmt, BSI_SAME_STMT);
else
bsi_insert_before (&bsi, stmt, BSI_SAME_STMT);
-
+ update_stmt (stmt);
COND_EXPR_COND (exit_condition) = build (GE_EXPR,
boolean_type_node,
uboundvar,
ivvarinced);
-
- bbs = get_loop_body (loop);
- /* Now replace the induction variable in the moved statements with the
- correct loop induction variable. */
+ update_stmt (exit_condition);
+ bbs = get_loop_body_in_dom_order (loop);
+ /* Now move the statements, and replace the induction variable in the moved
+ statements with the correct loop induction variable. */
oldivvar = VEC_index (tree, loopivs, 0);
- for (i = 0; i < loop->num_nodes; i++)
+ for (i = loop->num_nodes - 1; i >= 0 ; i--)
{
block_stmt_iterator tobsi = bsi_last (bodybb);
if (bbs[i]->loop_father == loop)
{
- /* Note that the bsi only needs to be explicitly incremented
- when we don't move something, since it is automatically
- incremented when we do. */
- for (bsi = bsi_start (bbs[i]); !bsi_end_p (bsi);)
+ /* If this is true, we are *before* the inner loop.
+ If this isn't true, we are *after* it.
+
+ The only time can_convert_to_perfect_nest returns true when we
+ have statements before the inner loop is if they can be moved
+ into the inner loop.
+
+ The only time can_convert_to_perfect_nest returns true when we
+ have statements after the inner loop is if they can be moved into
+ the new split loop. */
+
+ if (dominated_by_p (CDI_DOMINATORS, loop->inner->header, bbs[i]))
+ {
+ for (bsi = bsi_last (bbs[i]); !bsi_end_p (bsi);)
+ {
+ use_operand_p use_p;
+ imm_use_iterator imm_iter;
+ tree stmt = bsi_stmt (bsi);
+
+ if (stmt == exit_condition
+ || not_interesting_stmt (stmt)
+ || stmt_is_bumper_for_loop (loop, stmt))
+ {
+ if (!bsi_end_p (bsi))
+ bsi_prev (&bsi);
+ continue;
+ }
+ /* Move this statement back into the inner loop.
+ This looks a bit confusing, but we are really just
+ finding the first non-exit phi use and moving the
+ statement to the beginning of that use's basic
+ block. */
+ FOR_EACH_IMM_USE_SAFE (use_p, imm_iter,
+ TREE_OPERAND (stmt, 0))
+ {
+ tree imm_stmt = USE_STMT (use_p);
+ if (!exit_phi_for_loop_p (loop->inner, imm_stmt))
+ {
+ block_stmt_iterator tobsi = bsi_after_labels (bb_for_stmt (imm_stmt));
+ bsi_move_after (&bsi, &tobsi);
+ update_stmt (stmt);
+ BREAK_FROM_SAFE_IMM_USE (imm_iter);
+ }
+ }
+ }
+ }
+ else
{
- tree stmt = bsi_stmt (bsi);
- if (stmt == exit_condition
- || not_interesting_stmt (stmt)
- || stmt_is_bumper_for_loop (loop, stmt))
- {
- bsi_next (&bsi);
- continue;
+ /* Note that the bsi only needs to be explicitly incremented
+ when we don't move something, since it is automatically
+ incremented when we do. */
+ for (bsi = bsi_start (bbs[i]); !bsi_end_p (bsi);)
+ {
+ ssa_op_iter i;
+ tree n, stmt = bsi_stmt (bsi);
+
+ if (stmt == exit_condition
+ || not_interesting_stmt (stmt)
+ || stmt_is_bumper_for_loop (loop, stmt))
+ {
+ bsi_next (&bsi);
+ continue;
+ }
+
+ replace_uses_equiv_to_x_with_y (loop, stmt,
+ oldivvar,
+ VEC_index (int, steps, 0),
+ ivvar);
+ bsi_move_before (&bsi, &tobsi);
+
+ /* If the statement has any virtual operands, they may
+ need to be rewired because the original loop may
+ still reference them. */
+ FOR_EACH_SSA_TREE_OPERAND (n, stmt, i, SSA_OP_ALL_VIRTUALS)
+ mark_sym_for_renaming (SSA_NAME_VAR (n));
}
- replace_uses_of_x_with_y (stmt, oldivvar, ivvar);
- bsi_move_before (&bsi, &tobsi);
}
+
}
}
+
free (bbs);
return perfect_nest_p (loop);
}
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