/* Lambda matrix and vector interface.
- Copyright (C) 2003, 2004, 2005 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.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
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, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#ifndef LAMBDA_H
#define LAMBDA_H
integers. */
typedef int *lambda_vector;
+DEF_VEC_P(lambda_vector);
+DEF_VEC_ALLOC_P(lambda_vector,heap);
+
/* An integer matrix. A matrix consists of m vectors of length n (IE
all vectors are the same length). */
typedef lambda_vector *lambda_matrix;
/* A transformation matrix, which is a self-contained ROWSIZE x COLSIZE
matrix. Rather than use floats, we simply keep a single DENOMINATOR that
represents the denominator for every element in the matrix. */
-typedef struct
+typedef struct lambda_trans_matrix_s
{
lambda_matrix matrix;
int rowsize;
This structure is used during code generation in order to rewrite the old
induction variable uses in a statement in terms of the newly created
induction variables. */
-typedef struct
+typedef struct lambda_body_vector_s
{
lambda_vector coefficients;
int size;
#define LLE_DENOMINATOR(T) ((T)->denominator)
#define LLE_NEXT(T) ((T)->next)
-lambda_linear_expression lambda_linear_expression_new (int, int);
+struct obstack;
+
+lambda_linear_expression lambda_linear_expression_new (int, int,
+ struct obstack *);
void print_lambda_linear_expression (FILE *, lambda_linear_expression, int,
int, char);
and an integer representing the number of INVARIANTS in the loop. Both of
these integers are used to size the associated coefficient vectors in the
linear expression structures. */
-typedef struct
+typedef struct lambda_loopnest_s
{
lambda_loop *loops;
int depth;
#define LN_DEPTH(T) ((T)->depth)
#define LN_INVARIANTS(T) ((T)->invariants)
-lambda_loopnest lambda_loopnest_new (int, int);
-lambda_loopnest lambda_loopnest_transform (lambda_loopnest, lambda_trans_matrix);
+lambda_loopnest lambda_loopnest_new (int, int, struct obstack *);
+lambda_loopnest lambda_loopnest_transform (lambda_loopnest,
+ lambda_trans_matrix,
+ struct obstack *);
struct loop;
-struct loops;
bool perfect_nest_p (struct loop *);
-bool lambda_transform_legal_p (lambda_trans_matrix, int, varray_type);
void print_lambda_loopnest (FILE *, lambda_loopnest, char);
#define lambda_loop_new() (lambda_loop) ggc_alloc_cleared (sizeof (struct lambda_loop_s))
lambda_vector);
bool lambda_trans_matrix_id_p (lambda_trans_matrix);
-lambda_body_vector lambda_body_vector_new (int);
-lambda_body_vector lambda_body_vector_compute_new (lambda_trans_matrix,
- lambda_body_vector);
+lambda_body_vector lambda_body_vector_new (int, struct obstack *);
+lambda_body_vector lambda_body_vector_compute_new (lambda_trans_matrix,
+ lambda_body_vector,
+ struct obstack *);
void print_lambda_body_vector (FILE *, lambda_body_vector);
-lambda_loopnest gcc_loopnest_to_lambda_loopnest (struct loops *,
- struct loop *,
- VEC(tree,heap) **,
+lambda_loopnest gcc_loopnest_to_lambda_loopnest (struct loop *,
VEC(tree,heap) **,
- bool);
+ VEC(tree,heap) **,
+ struct obstack *);
void lambda_loopnest_to_gcc_loopnest (struct loop *,
VEC(tree,heap) *, VEC(tree,heap) *,
- lambda_loopnest, lambda_trans_matrix);
-
+ VEC(tree,heap) **,
+ lambda_loopnest, lambda_trans_matrix,
+ struct obstack *);
+void remove_iv (tree);
static inline void lambda_vector_negate (lambda_vector, lambda_vector, int);
static inline void lambda_vector_mult_const (lambda_vector, lambda_vector, int, int);
static inline lambda_vector
lambda_vector_new (int size)
{
- return ggc_alloc_cleared (size * sizeof(int));
+ return GGC_CNEWVEC (int, size);
}
fprintf (outfile, "\n");
}
+/* Compute the greatest common divisor of two numbers using
+ Euclid's algorithm. */
+
+static inline 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 divisor of a VECTOR of SIZE numbers. */
+
+static inline int
+lambda_vector_gcd (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;
+}
+
/* Returns true when the vector V is lexicographically positive, in
other words, when the first nonzero element is positive. */
return true;
}
+/* Given a vector of induction variables IVS, and a vector of
+ coefficients COEFS, build a tree that is a linear combination of
+ the induction variables. */
+
+static inline tree
+build_linear_expr (tree type, lambda_vector coefs, VEC (tree, heap) *ivs)
+{
+ unsigned i;
+ tree iv;
+ tree expr = fold_convert (type, integer_zero_node);
+
+ for (i = 0; VEC_iterate (tree, ivs, i, iv); i++)
+ {
+ int k = coefs[i];
+
+ if (k == 1)
+ expr = fold_build2 (PLUS_EXPR, type, expr, iv);
+
+ else if (k != 0)
+ expr = fold_build2 (PLUS_EXPR, type, expr,
+ fold_build2 (MULT_EXPR, type, iv,
+ build_int_cst (type, k)));
+ }
+
+ return expr;
+}
+
+/* Returns the dependence level for a vector DIST of size LENGTH.
+ LEVEL = 0 means a lexicographic dependence, i.e. a dependence due
+ to the sequence of statements, not carried by any loop. */
+
+
+static inline unsigned
+dependence_level (lambda_vector dist_vect, int length)
+{
+ int i;
+
+ for (i = 0; i < length; i++)
+ if (dist_vect[i] != 0)
+ return i + 1;
+
+ return 0;
+}
+
#endif /* LAMBDA_H */
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