/* Loop transformation code generation
- Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dberlin@dberlin.org>
This file is part of GCC.
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"
#include "tree-scalar-evolution.h"
#include "vec.h"
#include "lambda.h"
+#include "vecprim.h"
/* This loop nest code generation is based on non-singular matrix
math.
A loop iteration space represents the points traversed by the loop. A point in the
iteration space can be represented by a vector of size <loop depth>. You can
- therefore represent the iteration space as a integral combinations of a set
+ therefore represent the iteration space as an integral combinations of a set
of basis vectors.
A loop iteration space is dense if every integer point between the loop
Fourier-Motzkin elimination is used to compute the bounds of the base space
of the lattice. */
-
-DEF_VEC_GC_P(int);
-
-static bool perfect_nestify (struct loops *,
- struct loop *, VEC (tree) *,
- VEC (tree) *, VEC (int) *, VEC (tree) *);
+static bool perfect_nestify (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_lattice lambda_lattice_compute_base (lambda_loopnest);
static tree find_induction_var_from_exit_cond (struct loop *);
+static bool can_convert_to_perfect_nest (struct loop *);
/* Create a new lambda body vector. */
return ret;
}
-/* Compute the greatest common denominator of two numbers (A and B) using
- Euclid's algorithm. */
-
-static int
-gcd (int a, int b)
-{
-
- int x, y, z;
-
- x = abs (a);
- y = abs (b);
-
- while (x > 0)
- {
- z = y % x;
- y = x;
- x = z;
- }
-
- return (y);
-}
-
-/* Compute the greatest common denominator of a VECTOR of SIZE numbers. */
-
-static int
-gcd_vector (lambda_vector vector, int size)
-{
- int i;
- int gcd1 = 0;
-
- if (size > 0)
- {
- gcd1 = vector[0];
- for (i = 1; i < size; i++)
- gcd1 = gcd (gcd1, vector[i]);
- }
- return gcd1;
-}
-
/* Compute the least common multiple of two numbers A and B . */
-static int
-lcm (int a, int b)
+int
+least_common_multiple (int a, int b)
{
return (abs (a) * abs (b) / gcd (a, b));
}
/* Perform Fourier-Motzkin elimination to calculate the bounds of the
- auxillary nest.
+ auxiliary nest.
Fourier-Motzkin is a way of reducing systems of linear inequalities so that
it is easy to calculate the answer and bounds.
A sketch of how it works:
{
if (A[k][i] < 0)
{
- multiple = lcm (A[j][i], A[k][i]);
+ multiple = least_common_multiple (A[j][i], A[k][i]);
f1 = multiple / A[j][i];
f2 = -1 * multiple / A[k][i];
}
/* Compute the loop bounds for the auxiliary space NEST.
- Input system used is Ax <= b. TRANS is the unimodular transformation. */
+ Input system used is Ax <= b. TRANS is the unimodular transformation.
+ Given the original nest, this function will
+ 1. Convert the nest into matrix form, which consists of a matrix for the
+ coefficients, a matrix for the
+ invariant coefficients, and a vector for the constants.
+ 2. Use the matrix form to calculate the lattice base for the nest (which is
+ a dense space)
+ 3. Compose the dense space transform with the user specified transform, to
+ get a transform we can easily calculate transformed bounds for.
+ 4. Multiply the composed transformation matrix times the matrix form of the
+ loop.
+ 5. Transform the newly created matrix (from step 4) back into a loop nest
+ using Fourier-Motzkin elimination to figure out the bounds. */
static lambda_loopnest
lambda_compute_auxillary_space (lambda_loopnest nest,
lambda_matrix A, B, A1, B1;
lambda_vector a, a1;
lambda_matrix invertedtrans;
- int determinant, depth, invariants, size;
+ int depth, invariants, size;
int i, j;
lambda_loop loop;
lambda_linear_expression expression;
/* Unfortunately, we can't know the number of constraints we'll have
ahead of time, but this should be enough even in ridiculous loop nest
- cases. We abort if we go over this limit. */
+ cases. We must not go over this limit. */
A = lambda_matrix_new (128, depth);
B = lambda_matrix_new (128, invariants);
a = lambda_vector_new (128);
lambda_matrix_add_mc (B, 1, B1, -1, B1, size, invariants);
/* Now compute the auxiliary space bounds by first inverting U, multiplying
- it by A1, then performing fourier motzkin. */
+ it by A1, then performing Fourier-Motzkin. */
invertedtrans = lambda_matrix_new (depth, depth);
/* Compute the inverse of U. */
- determinant = lambda_matrix_inverse (LTM_MATRIX (trans),
- invertedtrans, depth);
+ lambda_matrix_inverse (LTM_MATRIX (trans),
+ invertedtrans, depth);
/* A = A1 inv(U). */
lambda_matrix_mult (A1, invertedtrans, A, size, depth, depth);
}
/* Compute the loop bounds for the target space, using the bounds of
- the auxiliary nest AUXILLARY_NEST, and the triangular matrix H. This is
- done by matrix multiplication and then transformation of the new matrix
- back into linear expression form.
+ the auxiliary nest AUXILLARY_NEST, and the triangular matrix H.
+ The target space loop bounds are computed by multiplying the triangular
+ matrix H by the auxiliary nest, to get the new loop bounds. The sign of
+ the loop steps (positive or negative) is then used to swap the bounds if
+ the loop counts downwards.
Return the target loopnest. */
static lambda_loopnest
LN_LOOPS (target_nest)[i] = target_loop;
/* Computes the gcd of the coefficients of the linear part. */
- gcd1 = gcd_vector (target[i], i);
+ gcd1 = lambda_vector_gcd (target[i], i);
/* Include the denominator in the GCD. */
gcd1 = gcd (gcd1, determinant);
}
/* Find the gcd and divide by it here, rather than doing it
at the tree level. */
- gcd1 = gcd_vector (LLE_COEFFICIENTS (target_expr), depth);
- gcd2 = gcd_vector (LLE_INVARIANT_COEFFICIENTS (target_expr),
- invariants);
+ gcd1 = lambda_vector_gcd (LLE_COEFFICIENTS (target_expr), depth);
+ gcd2 = lambda_vector_gcd (LLE_INVARIANT_COEFFICIENTS (target_expr),
+ invariants);
gcd1 = gcd (gcd1, gcd2);
gcd1 = gcd (gcd1, LLE_CONSTANT (target_expr));
gcd1 = gcd (gcd1, LLE_DENOMINATOR (target_expr));
}
/* Find the gcd and divide by it here, instead of at the
tree level. */
- gcd1 = gcd_vector (LLE_COEFFICIENTS (target_expr), depth);
- gcd2 = gcd_vector (LLE_INVARIANT_COEFFICIENTS (target_expr),
- invariants);
+ gcd1 = lambda_vector_gcd (LLE_COEFFICIENTS (target_expr), depth);
+ gcd2 = lambda_vector_gcd (LLE_INVARIANT_COEFFICIENTS (target_expr),
+ invariants);
gcd1 = gcd (gcd1, gcd2);
gcd1 = gcd (gcd1, LLE_CONSTANT (target_expr));
gcd1 = gcd (gcd1, LLE_DENOMINATOR (target_expr));
2. Composing the dense base with the specified transformation (TRANS)
3. Decomposing the combined transformation into a lower triangular portion,
and a unimodular portion.
- 4. Computing the auxillary nest using the unimodular portion.
- 5. Computing the target nest using the auxillary nest and the lower
+ 4. Computing the auxiliary nest using the unimodular portion.
+ 5. Computing the target nest using the auxiliary nest and the lower
triangular portion. */
lambda_loopnest
static lambda_linear_expression
gcc_tree_to_linear_expression (int depth, tree expr,
- VEC(tree) *outerinductionvars,
- VEC(tree) *invariants, int extra)
+ VEC(tree,heap) *outerinductionvars,
+ VEC(tree,heap) *invariants, int extra)
{
lambda_linear_expression lle = NULL;
switch (TREE_CODE (expr))
{
if (is_gimple_min_invariant (op))
return true;
- if (loop->depth == 0)
+ if (loop_depth (loop) == 0)
return true;
if (!expr_invariant_in_loop_p (loop, op))
return false;
- if (loop->outer
- && !invariant_in_loop_and_outer_loops (loop->outer, op))
+ if (!invariant_in_loop_and_outer_loops (loop_outer (loop), op))
return false;
return true;
}
static lambda_loop
gcc_loop_to_lambda_loop (struct loop *loop, int depth,
- VEC (tree) ** invariants,
+ VEC(tree,heap) ** invariants,
tree * ourinductionvar,
- VEC (tree) * outerinductionvars,
- VEC (tree) ** lboundvars,
- VEC (tree) ** uboundvars,
- VEC (int) ** 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)
{
- get_stmt_operands (phi);
- 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, *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, *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.
*/
ubound = gcc_tree_to_linear_expression (depth, uboundvar,
outerinductionvars,
*invariants, extra);
- uboundresult = build (PLUS_EXPR, TREE_TYPE (uboundvar), uboundvar,
- build_int_cst (TREE_TYPE (uboundvar), extra));
- VEC_safe_push (tree, *uboundvars, uboundresult);
- VEC_safe_push (tree, *lboundvars, lboundvar);
- VEC_safe_push (int, *steps, stepint);
+ uboundresult = build2 (PLUS_EXPR, TREE_TYPE (uboundvar), uboundvar,
+ build_int_cst (TREE_TYPE (uboundvar), extra));
+ 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))
return ivarop;
}
-DEF_VEC_GC_P(lambda_loop);
+DEF_VEC_P(lambda_loop);
+DEF_VEC_ALLOC_P(lambda_loop,heap);
+
/* Generate a lambda loopnest from a gcc loopnest LOOP_NEST.
Return the new loop nest.
INDUCTIONVARS is a pointer to an array of induction variables for the
during this process. */
lambda_loopnest
-gcc_loopnest_to_lambda_loopnest (struct loops *currloops,
- struct loop * loop_nest,
- VEC (tree) **inductionvars,
- VEC (tree) **invariants,
- bool need_perfect_nest)
+gcc_loopnest_to_lambda_loopnest (struct loop *loop_nest,
+ VEC(tree,heap) **inductionvars,
+ VEC(tree,heap) **invariants)
{
- lambda_loopnest ret;
- struct loop *temp;
- int depth = 0;
+ lambda_loopnest ret = NULL;
+ struct loop *temp = loop_nest;
+ int depth = depth_of_nest (loop_nest);
size_t i;
- VEC (lambda_loop) *loops = NULL;
- VEC (tree) *uboundvars = NULL;
- VEC (tree) *lboundvars = NULL;
- VEC (int) *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;
-
- depth = depth_of_nest (loop_nest);
- temp = loop_nest;
+ bool perfect_nest = perfect_nest_p (loop_nest);
+
+ if (!perfect_nest && !can_convert_to_perfect_nest (loop_nest))
+ goto fail;
+
while (temp)
{
newloop = gcc_loop_to_lambda_loop (temp, depth, invariants,
&lboundvars, &uboundvars,
&steps);
if (!newloop)
- return NULL;
- VEC_safe_push (tree, *inductionvars, inductionvar);
- VEC_safe_push (lambda_loop, loops, newloop);
+ goto fail;
+
+ VEC_safe_push (tree, heap, *inductionvars, inductionvar);
+ VEC_safe_push (lambda_loop, heap, loops, newloop);
temp = temp->inner;
}
- if (need_perfect_nest)
+
+ if (!perfect_nest)
{
- if (!perfect_nestify (currloops, loop_nest,
- lboundvars, uboundvars, steps, *inductionvars))
+ if (!perfect_nestify (loop_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) *induction_vars,
- tree * stmts_to_insert)
+ tree type, VEC(tree,heap) *induction_vars,
+ tree *stmts_to_insert)
{
tree stmts, stmt, resvar, name;
tree iv;
/* Create a statement list and a linear expression temporary. */
stmts = alloc_stmt_list ();
resvar = create_tmp_var (type, "lbvtmp");
- add_referenced_tmp_var (resvar);
+ add_referenced_var (resvar);
/* Start at 0. */
- stmt = build (MODIFY_EXPR, void_type_node, resvar, integer_zero_node);
+ stmt = build_gimple_modify_stmt (resvar,
+ fold_convert (type, integer_zero_node));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
/* 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)));
+ stmt = build_gimple_modify_stmt (resvar,
+ fold_build2 (MULT_EXPR, type,
+ iv, coeffmult));
newname = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = newname;
+ GIMPLE_STMT_OPERAND (stmt, 0) = newname;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
/* name = name + newname */
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (PLUS_EXPR, type, name, newname));
+ stmt = build_gimple_modify_stmt (resvar,
+ build2 (PLUS_EXPR, type,
+ name, newname));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
if (LBV_DENOMINATOR (lbv) != 1)
{
tree denominator = build_int_cst (type, LBV_DENOMINATOR (lbv));
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (CEIL_DIV_EXPR, type, name, denominator));
+ stmt = build_gimple_modify_stmt (resvar,
+ build2 (CEIL_DIV_EXPR, type,
+ name, denominator));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
lle_to_gcc_expression (lambda_linear_expression lle,
lambda_linear_expression offset,
tree type,
- VEC(tree) *induction_vars,
- VEC(tree) *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) *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 ();
resvar = create_tmp_var (type, "lletmp");
- add_referenced_tmp_var (resvar);
+ add_referenced_var (resvar);
/* Build up the linear expressions, and put the variable representing the
result in the results array. */
for (; lle != NULL; lle = LLE_NEXT (lle))
{
/* Start at name = 0. */
- stmt = build (MODIFY_EXPR, void_type_node, resvar, integer_zero_node);
+ stmt = build_gimple_modify_stmt (resvar,
+ fold_convert (type, integer_zero_node));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
{
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 */
- stmt = build (MODIFY_EXPR, void_type_node, resvar, mult);
+ stmt = build_gimple_modify_stmt (resvar, mult);
newname = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = newname;
+ GIMPLE_STMT_OPERAND (stmt, 0) = newname;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
/* name = name + newname */
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (PLUS_EXPR, type, name, newname));
+ stmt = build_gimple_modify_stmt (resvar,
+ build2 (PLUS_EXPR, type,
+ name, newname));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
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 */
- stmt = build (MODIFY_EXPR, void_type_node, resvar, mult);
+ stmt = build_gimple_modify_stmt (resvar, mult);
newname = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = newname;
+ GIMPLE_STMT_OPERAND (stmt, 0) = newname;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
/* name = name + newname */
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (PLUS_EXPR, type, name, newname));
+ stmt = build_gimple_modify_stmt (resvar,
+ build2 (PLUS_EXPR, type,
+ name, newname));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
name = name + constant. */
if (LLE_CONSTANT (lle) != 0)
{
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (PLUS_EXPR, type, name,
- build_int_cst (type, LLE_CONSTANT (lle))));
+ tree incr = build_int_cst (type, LLE_CONSTANT (lle));
+ stmt = build_gimple_modify_stmt (resvar, build2 (PLUS_EXPR, type,
+ name, incr));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
name = name + linear offset. */
if (LLE_CONSTANT (offset) != 0)
{
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (PLUS_EXPR, type, name,
- build_int_cst (type, LLE_CONSTANT (offset))));
+ tree incr = build_int_cst (type, LLE_CONSTANT (offset));
+ stmt = build_gimple_modify_stmt (resvar, build2 (PLUS_EXPR, type,
+ name, incr));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
fold_stmt (&stmt);
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
/* 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 = build2 (wrap == MAX_EXPR ? CEIL_DIV_EXPR : FLOOR_DIV_EXPR,
+ type, name, stmt);
+ stmt = build_gimple_modify_stmt (resvar, stmt);
/* name = {ceil, floor}(name/denominator) */
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
tsi = tsi_last (stmts);
tsi_link_after (&tsi, stmt, TSI_CONTINUE_LINKING);
}
- VEC_safe_push (tree, results, name);
+ VEC_safe_push (tree, heap, results, name);
}
/* Again, out of laziness, we don't handle this case yet. It's not
{
tree op1 = VEC_index (tree, results, 0);
tree op2 = VEC_index (tree, results, 1);
- stmt = build (MODIFY_EXPR, void_type_node, resvar,
- build (wrap, type, op1, op2));
+ stmt = build_gimple_modify_stmt (resvar, build2 (wrap, type, op1, op2));
name = make_ssa_name (resvar, stmt);
- TREE_OPERAND (stmt, 0) = name;
+ GIMPLE_STMT_OPERAND (stmt, 0) = name;
tsi = tsi_last (stmts);
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) *old_ivs,
- VEC(tree) *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) *new_ivs = NULL;
+ VEC(tree,heap) *new_ivs = NULL;
tree oldiv;
block_stmt_iterator bsi;
{
lambda_loop newloop;
basic_block bb;
+ edge exit;
tree ivvar, ivvarinced, exitcond, stmts;
enum tree_code testtype;
tree newupperbound, newlowerbound;
lambda_linear_expression offset;
tree type;
+ bool insert_after;
+ tree inc_stmt;
oldiv = VEC_index (tree, old_ivs, i);
type = TREE_TYPE (oldiv);
/* First, build the new induction variable temporary */
ivvar = create_tmp_var (type, "lnivtmp");
- add_referenced_tmp_var (ivvar);
+ add_referenced_var (ivvar);
- VEC_safe_push (tree, new_ivs, ivvar);
+ VEC_safe_push (tree, heap, new_ivs, ivvar);
newloop = LN_LOOPS (new_loopnest)[i];
new_ivs,
invariants, MAX_EXPR, &stmts);
bsi_insert_on_edge (loop_preheader_edge (temp), stmts);
- bsi_commit_edge_inserts (NULL);
+ bsi_commit_edge_inserts ();
/* Build the new upper bound and insert its statements in the
basic block of the exit condition */
newupperbound = lle_to_gcc_expression (LL_UPPER_BOUND (newloop),
type,
new_ivs,
invariants, MIN_EXPR, &stmts);
+ exit = single_exit (temp);
exitcond = get_loop_exit_condition (temp);
bb = bb_for_stmt (exitcond);
bsi = bsi_start (bb);
bsi_insert_after (&bsi, stmts, BSI_NEW_STMT);
- /* Create the new iv, and insert it's increment on the latch
- block. */
+ /* Create the new iv. */
- bb = EDGE_PRED (temp->latch, 0)->src;
- bsi = bsi_last (bb);
+ standard_iv_increment_position (temp, &bsi, &insert_after);
create_iv (newlowerbound,
build_int_cst (type, LL_STEP (newloop)),
- ivvar, temp, &bsi, false, &ivvar,
- &ivvarinced);
+ ivvar, temp, &bsi, insert_after, &ivvar,
+ NULL);
+
+ /* Unfortunately, the incremented ivvar that create_iv inserted may not
+ dominate the block containing the exit condition.
+ So we simply create our own incremented iv to use in the new exit
+ test, and let redundancy elimination sort it out. */
+ inc_stmt = build2 (PLUS_EXPR, type,
+ ivvar, build_int_cst (type, LL_STEP (newloop)));
+ inc_stmt = build_gimple_modify_stmt (SSA_NAME_VAR (ivvar), inc_stmt);
+ ivvarinced = make_ssa_name (SSA_NAME_VAR (ivvar), inc_stmt);
+ GIMPLE_STMT_OPERAND (inc_stmt, 0) = ivvarinced;
+ bsi = bsi_for_stmt (exitcond);
+ bsi_insert_before (&bsi, inc_stmt, BSI_SAME_STMT);
/* Replace the exit condition with the new upper bound
comparison. */
testtype = LL_STEP (newloop) >= 0 ? LE_EXPR : GE_EXPR;
- /* Since we don't know which cond_expr part currently points to each
- edge, check which one is invariant and make sure we reverse the
- comparison if we are trying to replace a <= 50 with 50 >= newiv.
- This ensures that we still canonicalize to <invariant> <test>
- <induction variable>. */
- if (!expr_invariant_in_loop_p (temp, TREE_OPERAND (exitcond, 0)))
+ /* We want to build a conditional where true means exit the loop, and
+ false means continue the loop.
+ So swap the testtype if this isn't the way things are.*/
+
+ if (exit->flags & EDGE_FALSE_VALUE)
testtype = swap_tree_comparison (testtype);
-
- COND_EXPR_COND (exitcond) = build (testtype,
- boolean_type_node,
- newupperbound, ivvarinced);
- modify_stmt (exitcond);
+
+ COND_EXPR_COND (exitcond) = build2 (testtype,
+ boolean_type_node,
+ newupperbound, ivvarinced);
+ update_stmt (exitcond);
VEC_replace (tree, new_ivs, i, ivvar);
i++;
for (i = 0; VEC_iterate (tree, old_ivs, i, oldiv); i++)
{
- int j;
- dataflow_t imm = get_immediate_uses (SSA_NAME_DEF_STMT (oldiv));
- for (j = 0; j < num_immediate_uses (imm); j++)
- {
- tree stmt = immediate_use (imm, j);
- use_operand_p use_p;
- ssa_op_iter iter;
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
+ tree oldiv_def;
+ tree oldiv_stmt = SSA_NAME_DEF_STMT (oldiv);
+ tree stmt;
+
+ if (TREE_CODE (oldiv_stmt) == PHI_NODE)
+ oldiv_def = PHI_RESULT (oldiv_stmt);
+ else
+ oldiv_def = SINGLE_SSA_TREE_OPERAND (oldiv_stmt, SSA_OP_DEF);
+ gcc_assert (oldiv_def != NULL_TREE);
+
+ FOR_EACH_IMM_USE_STMT (stmt, imm_iter, oldiv_def)
+ {
+ tree newiv, stmts;
+ lambda_body_vector lbv, newlbv;
+
gcc_assert (TREE_CODE (stmt) != PHI_NODE);
- FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE)
- {
- if (USE_FROM_PTR (use_p) == oldiv)
- {
- tree newiv, stmts;
- lambda_body_vector lbv, newlbv;
- /* Compute the new expression for the induction
- variable. */
- depth = VEC_length (tree, new_ivs);
- lbv = lambda_body_vector_new (depth);
- LBV_COEFFICIENTS (lbv)[i] = 1;
-
- newlbv = lambda_body_vector_compute_new (transform, lbv);
-
- newiv = lbv_to_gcc_expression (newlbv, TREE_TYPE (oldiv),
- new_ivs, &stmts);
- bsi = bsi_for_stmt (stmt);
- /* Insert the statements to build that
- expression. */
- bsi_insert_before (&bsi, stmts, BSI_SAME_STMT);
- propagate_value (use_p, newiv);
- modify_stmt (stmt);
-
- }
- }
- }
- }
-}
+ /* Compute the new expression for the induction
+ variable. */
+ depth = VEC_length (tree, new_ivs);
+ lbv = lambda_body_vector_new (depth);
+ LBV_COEFFICIENTS (lbv)[i] = 1;
+
+ newlbv = lambda_body_vector_compute_new (transform, lbv);
-/* Returns true when the vector V is lexicographically positive, in
- other words, when the first nonzero element is positive. */
+ newiv = lbv_to_gcc_expression (newlbv, TREE_TYPE (oldiv),
+ new_ivs, &stmts);
+ bsi = bsi_for_stmt (stmt);
+ /* Insert the statements to build that
+ expression. */
+ bsi_insert_before (&bsi, stmts, BSI_SAME_STMT);
-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;
+ FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter)
+ propagate_value (use_p, newiv);
+ update_stmt (stmt);
+ }
}
- return true;
+ VEC_free (tree, heap, new_ivs);
}
-
/* 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);
- dataflow_t imm;
- int i;
+ 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);
- imm = get_immediate_uses (stmt);
- for (i = 0; i < num_immediate_uses (imm); i++)
+
+ FOR_EACH_IMM_USE_FAST (use_p, iter, def)
{
- use = immediate_use (imm, i);
+ use = USE_STMT (use_p);
if (TREE_CODE (use) == PHI_NODE)
{
if (phi_loop_edge_uses_def (loop, use, def))
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.
+ YINIT is the initial value of Y, REPLACEMENTS is a hash table to
+ avoid creating duplicate temporaries and FIRSTBSI is statement
+ iterator where new temporaries should be inserted at the beginning
+ of body basic block. */
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, tree yinit,
+ htab_t replacements,
+ block_stmt_iterator *firstbsi)
{
- 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 scev, init, val, var, setstmt;
+ struct tree_map *h, in;
+ void **loc;
+
+ /* Replace uses of X with Y right away. */
+ if (use == x)
+ {
+ SET_USE (use_p, y);
+ continue;
+ }
+
+ scev = instantiate_parameters (loop,
+ analyze_scalar_evolution (loop, use));
+
+ if (scev == NULL || scev == chrec_dont_know)
+ continue;
+
+ step = evolution_part_in_loop_num (scev, loop->num);
+ if (step == NULL
+ || step == chrec_dont_know
+ || TREE_CODE (step) != INTEGER_CST
+ || int_cst_value (step) != xstep)
+ continue;
+
+ /* Use REPLACEMENTS hash table to cache already created
+ temporaries. */
+ in.hash = htab_hash_pointer (use);
+ in.base.from = use;
+ h = htab_find_with_hash (replacements, &in, in.hash);
+ if (h != NULL)
+ {
+ SET_USE (use_p, h->to);
+ continue;
+ }
+
+ /* USE which has the same step as X should be replaced
+ with a temporary set to Y + YINIT - INIT. */
+ init = initial_condition_in_loop_num (scev, loop->num);
+ gcc_assert (init != NULL && init != chrec_dont_know);
+ if (TREE_TYPE (use) == TREE_TYPE (y))
+ {
+ val = fold_build2 (MINUS_EXPR, TREE_TYPE (y), init, yinit);
+ val = fold_build2 (PLUS_EXPR, TREE_TYPE (y), y, val);
+ if (val == y)
+ {
+ /* If X has the same type as USE, the same step
+ and same initial value, it can be replaced by Y. */
+ SET_USE (use_p, y);
+ continue;
+ }
+ }
+ else
+ {
+ val = fold_build2 (MINUS_EXPR, TREE_TYPE (y), y, yinit);
+ val = fold_convert (TREE_TYPE (use), val);
+ val = fold_build2 (PLUS_EXPR, TREE_TYPE (use), val, init);
+ }
+
+ /* Create a temporary variable and insert it at the beginning
+ of the loop body basic block, right after the PHI node
+ which sets Y. */
+ var = create_tmp_var (TREE_TYPE (use), "perfecttmp");
+ add_referenced_var (var);
+ val = force_gimple_operand_bsi (firstbsi, val, false, NULL);
+ setstmt = build_gimple_modify_stmt (var, val);
+ var = make_ssa_name (var, setstmt);
+ GIMPLE_STMT_OPERAND (setstmt, 0) = var;
+ bsi_insert_before (firstbsi, setstmt, BSI_SAME_STMT);
+ update_stmt (setstmt);
+ SET_USE (use_p, var);
+ h = ggc_alloc (sizeof (struct tree_map));
+ h->hash = in.hash;
+ h->base.from = use;
+ h->to = var;
+ loc = htab_find_slot_with_hash (replacements, h, in.hash, INSERT);
+ gcc_assert ((*(struct tree_map **)loc) == NULL);
+ *(struct tree_map **) loc = h;
}
}
-/* Return TRUE if STMT uses tree OP in it's uses. */
+/* Return true if STMT is an exit PHI for LOOP */
static bool
-stmt_uses_op (tree stmt, tree op)
+exit_phi_for_loop_p (struct loop *loop, tree stmt)
{
- use_optype uses = STMT_USE_OPS (stmt);
- size_t i;
- for (i = 0; i < NUM_USES (uses); i++)
+
+ if (TREE_CODE (stmt) != PHI_NODE
+ || PHI_NUM_ARGS (stmt) != 1
+ || bb_for_stmt (stmt) != single_exit (loop)->dest)
+ return false;
+
+ return true;
+}
+
+/* Return true if STMT can be put back into the loop INNER, by
+ copying it to the beginning of that loop and changing the uses. */
+
+static bool
+can_put_in_inner_loop (struct loop *inner, tree stmt)
+{
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
+
+ gcc_assert (TREE_CODE (stmt) == GIMPLE_MODIFY_STMT);
+ if (!ZERO_SSA_OPERANDS (stmt, SSA_OP_ALL_VIRTUALS)
+ || !expr_invariant_in_loop_p (inner, GIMPLE_STMT_OPERAND (stmt, 1)))
+ return false;
+
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, GIMPLE_STMT_OPERAND (stmt, 0))
{
- if (USE_OP (uses, i) == op)
- return true;
+ 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;
+ }
}
- return false;
+ return true;
+}
+
+/* Return true if STMT can be put *after* the inner loop of LOOP. */
+static bool
+can_put_after_inner_loop (struct loop *loop, tree stmt)
+{
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
+
+ if (!ZERO_SSA_OPERANDS (stmt, SSA_OP_ALL_VIRTUALS))
+ return false;
+
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, GIMPLE_STMT_OPERAND (stmt, 0))
+ {
+ if (!exit_phi_for_loop_p (loop, USE_STMT (use_p)))
+ {
+ basic_block immbb = bb_for_stmt (USE_STMT (use_p));
+
+ if (!dominated_by_p (CDI_DOMINATORS,
+ immbb,
+ loop->inner->header)
+ && !can_put_in_inner_loop (loop->inner, stmt))
+ 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
- occur after the inner loop. */
+
+
+/* Return TRUE if LOOP is an imperfect nest that we can convert to a
+ perfect one. At the moment, we only handle imperfect nests of
+ depth 2, where all of the statements occur after the inner loop. */
static bool
-can_convert_to_perfect_nest (struct loop *loop,
- VEC (tree) *loopivs)
+can_convert_to_perfect_nest (struct loop *loop)
{
basic_block *bbs;
- tree exit_condition;
+ tree exit_condition, phi;
size_t i;
block_stmt_iterator bsi;
+ basic_block exitdest;
/* Can't handle triply nested+ loops yet. */
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++)
{
for (bsi = bsi_start (bbs[i]); !bsi_end_p (bsi); bsi_next (&bsi))
{
- size_t j;
tree stmt = bsi_stmt (bsi);
+
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;
- }
-
- /* 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 scalar operation that can be put back
+ into the inner loop, or after the inner loop, through
+ copying, then do so. This works on the theory that
+ any amount of scalar code we have to reduplicate
+ into or after the loops is less expensive that the
+ win we get from rearranging the memory walk
+ the loop is doing so that it has better
+ cache behavior. */
+ if (TREE_CODE (stmt) == GIMPLE_MODIFY_STMT)
+ {
+ use_operand_p use_a, use_b;
+ imm_use_iterator imm_iter;
+ ssa_op_iter op_iter, op_iter1;
+ tree op0 = GIMPLE_STMT_OPERAND (stmt, 0);
+ tree scev = instantiate_parameters
+ (loop, analyze_scalar_evolution (loop, op0));
+
+ /* If the IV is simple, it can be duplicated. */
+ if (!automatically_generated_chrec_p (scev))
+ {
+ tree step = evolution_part_in_loop_num (scev, loop->num);
+ if (step && step != chrec_dont_know
+ && TREE_CODE (step) == INTEGER_CST)
+ continue;
+ }
+
+ /* The statement should not define a variable used
+ in the inner loop. */
+ if (TREE_CODE (op0) == SSA_NAME)
+ FOR_EACH_IMM_USE_FAST (use_a, imm_iter, op0)
+ if (bb_for_stmt (USE_STMT (use_a))->loop_father
+ == loop->inner)
+ goto fail;
+
+ FOR_EACH_SSA_USE_OPERAND (use_a, stmt, op_iter, SSA_OP_USE)
+ {
+ tree node, op = USE_FROM_PTR (use_a);
+
+ /* The variables should not be used in both loops. */
+ FOR_EACH_IMM_USE_FAST (use_b, imm_iter, op)
+ if (bb_for_stmt (USE_STMT (use_b))->loop_father
+ == loop->inner)
+ goto fail;
+
+ /* The statement should not use the value of a
+ scalar that was modified in the loop. */
+ node = SSA_NAME_DEF_STMT (op);
+ if (TREE_CODE (node) == PHI_NODE)
+ FOR_EACH_PHI_ARG (use_b, node, op_iter1, SSA_OP_USE)
+ {
+ tree arg = USE_FROM_PTR (use_b);
+
+ if (TREE_CODE (arg) == SSA_NAME)
+ {
+ tree arg_stmt = SSA_NAME_DEF_STMT (arg);
+
+ if (bb_for_stmt (arg_stmt)
+ && (bb_for_stmt (arg_stmt)->loop_father
+ == loop->inner))
+ goto fail;
+ }
+ }
+ }
+
+ if (can_put_in_inner_loop (loop->inner, stmt)
+ || can_put_after_inner_loop (loop, 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
+ now. */
+ exitdest = single_exit (loop)->dest;
+
+ for (phi = phi_nodes (exitdest); phi; phi = PHI_CHAIN (phi))
+ if (PHI_NUM_ARGS (phi) != 1)
+ goto fail;
+
+ free (bbs);
return true;
+
+ fail:
+ free (bbs);
+ return false;
}
/* Transform the loop nest into a perfect nest, if possible.
- LOOPS is the current struct loops *
LOOP is the loop nest to transform into a perfect nest
LBOUNDS are the lower bounds for the loops to transform
UBOUNDS are the upper bounds for the loops to transform
}
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) *lbounds,
- VEC (tree) *ubounds,
- VEC (int) *steps,
- VEC (tree) *loopivs)
+perfect_nestify (struct loop *loop,
+ 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;
+ tree cond_stmt;
basic_block preheaderbb, headerbb, bodybb, latchbb, olddest;
- size_t i;
- block_stmt_iterator bsi;
+ int i;
+ block_stmt_iterator bsi, firstbsi;
+ bool insert_after;
edge e;
struct loop *newloop;
tree phi;
tree uboundvar;
tree stmt;
tree oldivvar, ivvar, ivvarinced;
- VEC (tree) *phis = NULL;
-
- if (!can_convert_to_perfect_nest (loop, loopivs))
- return false;
-
- /* Create the new loop */
+ VEC(tree,heap) *phis = NULL;
+ htab_t replacements = NULL;
- olddest = loop->single_exit->dest;
- preheaderbb = loop_split_edge_with (loop->single_exit, NULL);
+ /* Create the new loop. */
+ olddest = single_exit (loop)->dest;
+ preheaderbb = split_edge (single_exit (loop));
headerbb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
- /* This is done because otherwise, it will release the ssa_name too early
- when the edge gets redirected and it will get reused, causing the use of
- the phi node to get rewritten. */
-
+ /* Push the exit phi nodes that we are moving. */
for (phi = phi_nodes (olddest); phi; phi = PHI_CHAIN (phi))
{
- /* These should be simple exit phi copies. */
- if (PHI_NUM_ARGS (phi) != 1)
- return false;
- VEC_safe_push (tree, phis, PHI_RESULT (phi));
- VEC_safe_push (tree, phis, PHI_ARG_DEF (phi, 0));
- mark_for_rewrite (PHI_RESULT (phi));
+ VEC_reserve (tree, heap, phis, 2);
+ VEC_quick_push (tree, phis, PHI_RESULT (phi));
+ VEC_quick_push (tree, phis, PHI_ARG_DEF (phi, 0));
}
- e = redirect_edge_and_branch (EDGE_SUCC (preheaderbb, 0), headerbb);
+ e = redirect_edge_and_branch (single_succ_edge (preheaderbb), headerbb);
/* Remove the exit phis from the old basic block. */
while (phi_nodes (olddest) != NULL)
- remove_phi_node (phi_nodes (olddest), NULL, olddest);
+ remove_phi_node (phi_nodes (olddest), NULL, false);
- /* and add them to the new basic block. */
+ /* and add them back to the new basic block. */
while (VEC_length (tree, phis) != 0)
{
tree def;
def = VEC_pop (tree, phis);
phiname = VEC_pop (tree, phis);
phi = create_phi_node (phiname, preheaderbb);
- add_phi_arg (&phi, def, EDGE_PRED (preheaderbb, 0));
- }
+ add_phi_arg (phi, def, single_pred_edge (preheaderbb));
+ }
flush_pending_stmts (e);
- unmark_all_for_rewrite ();
+ VEC_free (tree, heap, phis);
bodybb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
latchbb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
make_edge (headerbb, bodybb, EDGE_FALLTHRU);
- then_label = build1 (GOTO_EXPR, void_type_node, tree_block_label (latchbb));
- else_label = build1 (GOTO_EXPR, void_type_node, tree_block_label (olddest));
- cond_stmt = build (COND_EXPR, void_type_node,
- build (NE_EXPR, boolean_type_node,
- integer_one_node,
- integer_zero_node),
- then_label, else_label);
+ cond_stmt = build3 (COND_EXPR, void_type_node,
+ build2 (NE_EXPR, boolean_type_node,
+ integer_one_node,
+ integer_zero_node),
+ NULL_TREE, NULL_TREE);
bsi = bsi_start (bodybb);
bsi_insert_after (&bsi, cond_stmt, BSI_NEW_STMT);
e = make_edge (bodybb, olddest, EDGE_FALSE_VALUE);
make_edge (latchbb, headerbb, EDGE_FALLTHRU);
/* Update the loop structures. */
- newloop = duplicate_loop (loops, loop, olddest->loop_father);
+ newloop = duplicate_loop (loop, olddest->loop_father);
newloop->header = headerbb;
newloop->latch = latchbb;
- newloop->single_exit = e;
add_bb_to_loop (latchbb, newloop);
add_bb_to_loop (bodybb, newloop);
add_bb_to_loop (headerbb, newloop);
- add_bb_to_loop (preheaderbb, olddest->loop_father);
set_immediate_dominator (CDI_DOMINATORS, bodybb, headerbb);
set_immediate_dominator (CDI_DOMINATORS, headerbb, preheaderbb);
set_immediate_dominator (CDI_DOMINATORS, preheaderbb,
- loop->single_exit->src);
+ single_exit (loop)->src);
set_immediate_dominator (CDI_DOMINATORS, latchbb, bodybb);
- set_immediate_dominator (CDI_DOMINATORS, olddest, bodybb);
+ set_immediate_dominator (CDI_DOMINATORS, olddest,
+ recount_dominator (CDI_DOMINATORS, olddest));
/* Create the new iv. */
- ivvar = create_tmp_var (integer_type_node, "perfectiv");
- add_referenced_tmp_var (ivvar);
- bsi = bsi_last (EDGE_PRED (newloop->latch, 0)->src);
+ oldivvar = VEC_index (tree, loopivs, 0);
+ ivvar = create_tmp_var (TREE_TYPE (oldivvar), "perfectiv");
+ add_referenced_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)),
- ivvar, newloop, &bsi, false, &ivvar, &ivvarinced);
+ 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
it to one just in case. */
exit_condition = get_loop_exit_condition (newloop);
uboundvar = create_tmp_var (integer_type_node, "uboundvar");
- add_referenced_tmp_var (uboundvar);
- stmt = build (MODIFY_EXPR, void_type_node, uboundvar,
- VEC_index (tree, ubounds, 0));
+ add_referenced_var (uboundvar);
+ stmt = build_gimple_modify_stmt (uboundvar, VEC_index (tree, ubounds, 0));
uboundvar = make_ssa_name (uboundvar, stmt);
- TREE_OPERAND (stmt, 0) = uboundvar;
- bsi_insert_before (&bsi, stmt, BSI_SAME_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. */
+ GIMPLE_STMT_OPERAND (stmt, 0) = uboundvar;
+
+ if (insert_after)
+ 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) = build2 (GE_EXPR,
+ boolean_type_node,
+ uboundvar,
+ ivvarinced);
+ update_stmt (exit_condition);
+ replacements = htab_create_ggc (20, tree_map_hash,
+ tree_map_eq, NULL);
+ 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++)
+ firstbsi = bsi_start (bodybb);
+ 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]))
+ {
+ block_stmt_iterator header_bsi
+ = bsi_after_labels (loop->inner->header);
+
+ for (bsi = bsi_start (bbs[i]); !bsi_end_p (bsi);)
+ {
+ tree stmt = bsi_stmt (bsi);
+
+ if (stmt == exit_condition
+ || not_interesting_stmt (stmt)
+ || stmt_is_bumper_for_loop (loop, stmt))
+ {
+ bsi_next (&bsi);
+ continue;
+ }
+
+ bsi_move_before (&bsi, &header_bsi);
+ }
+ }
+ 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,
+ VEC_index (tree, lbounds, 0), replacements, &firstbsi);
+
+ 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);
- flow_loops_find (loops, LOOP_ALL);
+ htab_delete (replacements);
return perfect_nest_p (loop);
}
bool
lambda_transform_legal_p (lambda_trans_matrix trans,
int nb_loops,
- varray_type dependence_relations)
+ VEC (ddr_p, heap) *dependence_relations)
{
- unsigned int i;
+ unsigned int i, j;
lambda_vector distres;
struct data_dependence_relation *ddr;
-#if defined ENABLE_CHECKING
- if (LTM_COLSIZE (trans) != nb_loops
- || LTM_ROWSIZE (trans) != nb_loops)
- abort ();
-#endif
+ gcc_assert (LTM_COLSIZE (trans) == nb_loops
+ && LTM_ROWSIZE (trans) == nb_loops);
/* When there is an unknown relation in the dependence_relations, we
know that it is no worth looking at this loop nest: give up. */
- ddr = (struct data_dependence_relation *)
- VARRAY_GENERIC_PTR (dependence_relations, 0);
+ ddr = VEC_index (ddr_p, dependence_relations, 0);
if (ddr == NULL)
return true;
if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know)
distres = lambda_vector_new (nb_loops);
/* For each distance vector in the dependence graph. */
- for (i = 0; i < VARRAY_ACTIVE_SIZE (dependence_relations); i++)
+ for (i = 0; VEC_iterate (ddr_p, dependence_relations, i, ddr); i++)
{
- ddr = (struct data_dependence_relation *)
- VARRAY_GENERIC_PTR (dependence_relations, i);
-
/* Don't care about relations for which we know that there is no
dependence, nor about read-read (aka. output-dependences):
these data accesses can happen in any order. */
/* If the dependence could not be captured by a distance vector,
conservatively answer that the transform is not valid. */
- if (DDR_DIST_VECT (ddr) == NULL)
+ if (DDR_NUM_DIST_VECTS (ddr) == 0)
return false;
/* Compute trans.dist_vect */
- lambda_matrix_vector_mult (LTM_MATRIX (trans), nb_loops, nb_loops,
- DDR_DIST_VECT (ddr), distres);
+ for (j = 0; j < DDR_NUM_DIST_VECTS (ddr); j++)
+ {
+ lambda_matrix_vector_mult (LTM_MATRIX (trans), nb_loops, nb_loops,
+ DDR_DIST_VECT (ddr, j), distres);
- if (!lambda_vector_lexico_pos (distres, nb_loops))
- return false;
+ if (!lambda_vector_lexico_pos (distres, nb_loops))
+ return false;
+ }
}
return true;
}
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