/* Interchange heuristics and transform for loop interchange on
polyhedral representation.
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009, 2010 Free Software Foundation, Inc.
Contributed by Sebastian Pop <sebastian.pop@amd.com> and
Harsha Jagasia <harsha.jagasia@amd.com>.
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
-#include "ggc.h"
-#include "tree.h"
-#include "rtl.h"
-#include "output.h"
-#include "basic-block.h"
-#include "diagnostic.h"
#include "tree-flow.h"
-#include "toplev.h"
#include "tree-dump.h"
-#include "timevar.h"
#include "cfgloop.h"
#include "tree-chrec.h"
#include "tree-data-ref.h"
#include "tree-scalar-evolution.h"
-#include "tree-pass.h"
-#include "domwalk.h"
-#include "value-prof.h"
-#include "pointer-set.h"
-#include "gimple.h"
-#include "params.h"
+#include "sese.h"
#ifdef HAVE_cloog
-#include "cloog/cloog.h"
#include "ppl_c.h"
-#include "sese.h"
#include "graphite-ppl.h"
-#include "graphite.h"
#include "graphite-poly.h"
/* Builds a linear expression, of dimension DIM, representing PDR's
ppl_dimension_type i;
ppl_dimension_type first = pdr_subscript_dim (pdr, 0);
ppl_dimension_type last = pdr_subscript_dim (pdr, PDR_NB_SUBSCRIPTS (pdr));
- Value size, sub_size;
+ mpz_t size, sub_size;
graphite_dim_t dim = offset + pdr_dim (pdr);
ppl_new_Linear_Expression_with_dimension (&res, dim);
- value_init (size);
- value_set_si (size, 1);
- value_init (sub_size);
- value_set_si (sub_size, 1);
+ mpz_init (size);
+ mpz_set_si (size, 1);
+ mpz_init (sub_size);
+ mpz_set_si (sub_size, 1);
for (i = last - 1; i >= first; i--)
{
ppl_new_Linear_Expression_with_dimension (&le, dim - offset);
ppl_set_coef (le, i, 1);
ppl_max_for_le_pointset (PDR_ACCESSES (pdr), le, sub_size);
- value_multiply (size, size, sub_size);
+ mpz_mul (size, size, sub_size);
ppl_delete_Linear_Expression (le);
}
- value_clear (sub_size);
- value_clear (size);
+ mpz_clear (sub_size);
+ mpz_clear (size);
return res;
}
the loop at DEPTH. */
static void
-memory_stride_in_loop (Value stride, graphite_dim_t depth, poly_dr_p pdr)
+pdr_stride_in_loop (mpz_t stride, graphite_dim_t depth, poly_dr_p pdr)
{
ppl_dimension_type time_depth;
ppl_Linear_Expression_t le, lma;
if (dump_file && (dump_flags & TDF_DETAILS))
{
+ char *str;
+ void (*gmp_free) (void *, size_t);
+
fprintf (dump_file, "\nStride in BB_%d, DR_%d, depth %d:",
pbb_index (pbb), PDR_ID (pdr), (int) depth);
- value_print (dump_file, " %s ", stride);
+ str = mpz_get_str (0, 10, stride);
+ fprintf (dump_file, " %s ", str);
+ mp_get_memory_functions (NULL, NULL, &gmp_free);
+ (*gmp_free) (str, strlen (str) + 1);
}
ppl_delete_Pointset_Powerset_C_Polyhedron (p1);
ppl_delete_Linear_Expression (le);
}
-/* Sets STRIDES to the sum of all the strides of the data references accessed */
+
+/* Sets STRIDES to the sum of all the strides of the data references
+ accessed in LOOP at DEPTH. */
static void
-memory_strides_in_loop_depth (poly_bb_p pbb, graphite_dim_t depth, Value strides)
+memory_strides_in_loop_1 (lst_p loop, graphite_dim_t depth, mpz_t strides)
{
- int i;
+ int i, j;
+ lst_p l;
poly_dr_p pdr;
- Value s, n;
+ mpz_t s, n;
- value_set_si (strides, 0);
- value_init (s);
- value_init (n);
+ mpz_init (s);
+ mpz_init (n);
- for (i = 0; VEC_iterate (poly_dr_p, PBB_DRS (pbb), i, pdr); i++)
- {
- value_set_si (n, PDR_NB_REFS (pdr));
+ FOR_EACH_VEC_ELT (lst_p, LST_SEQ (loop), j, l)
+ if (LST_LOOP_P (l))
+ memory_strides_in_loop_1 (l, depth, strides);
+ else
+ FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (LST_PBB (l)), i, pdr)
+ {
+ pdr_stride_in_loop (s, depth, pdr);
+ mpz_set_si (n, PDR_NB_REFS (pdr));
+ mpz_mul (s, s, n);
+ mpz_add (strides, strides, s);
+ }
- memory_stride_in_loop (s, depth, pdr);
- value_multiply (s, s, n);
- value_addto (strides, strides, s);
- }
+ mpz_clear (s);
+ mpz_clear (n);
+}
+
+/* Sets STRIDES to the sum of all the strides of the data references
+ accessed in LOOP at DEPTH. */
- value_clear (s);
- value_clear (n);
+static void
+memory_strides_in_loop (lst_p loop, graphite_dim_t depth, mpz_t strides)
+{
+ if (mpz_cmp_si (loop->memory_strides, -1) == 0)
+ {
+ mpz_set_si (strides, 0);
+ memory_strides_in_loop_1 (loop, depth, strides);
+ }
+ else
+ mpz_set (strides, loop->memory_strides);
}
-/* Returns true when it is profitable to interchange time dimensions DEPTH1
- and DEPTH2 with DEPTH1 < DEPTH2 for PBB.
+/* Return true when the interchange of loops LOOP1 and LOOP2 is
+ profitable.
Example:
profitable to interchange the loops at DEPTH1 and DEPTH2. */
static bool
-pbb_interchange_profitable_p (graphite_dim_t depth1, graphite_dim_t depth2,
- poly_bb_p pbb)
+lst_interchange_profitable_p (lst_p nest, int depth1, int depth2)
{
- Value d1, d2;
+ mpz_t d1, d2;
bool res;
gcc_assert (depth1 < depth2);
- value_init (d1);
- value_init (d2);
+ mpz_init (d1);
+ mpz_init (d2);
- memory_strides_in_loop_depth (pbb, depth1, d1);
- memory_strides_in_loop_depth (pbb, depth2, d2);
+ memory_strides_in_loop (nest, depth1, d1);
+ memory_strides_in_loop (nest, depth2, d2);
- res = value_lt (d1, d2);
+ res = mpz_cmp (d1, d2) < 0;
- value_clear (d1);
- value_clear (d2);
+ mpz_clear (d1);
+ mpz_clear (d2);
return res;
}
int i;
lst_p l;
- for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
+ FOR_EACH_VEC_ELT (lst_p, LST_SEQ (lst), i, l)
lst_apply_interchange (l, depth1, depth2);
}
else
pbb_interchange_loop_depths (depth1, depth2, LST_PBB (lst));
}
-/* Return true when the interchange of loops at depths DEPTH1 and
- DEPTH2 to all the statements below LST is profitable. */
-
-static bool
-lst_interchange_profitable_p (lst_p lst, int depth1, int depth2)
-{
- if (!lst)
- return false;
-
- if (LST_LOOP_P (lst))
- {
- int i;
- lst_p l;
- bool res = false;
-
- for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
- {
- bool profitable = lst_interchange_profitable_p (l, depth1, depth2);
-
- if (profitable && !LST_LOOP_P (lst)
- && dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file,
- "Interchanging loops at depths %d and %d is profitable for stmt_%d.\n",
- depth1, depth2, pbb_index (LST_PBB (lst)));
-
- res |= profitable;
- }
-
- return res;
- }
- else
- return pbb_interchange_profitable_p (depth1, depth2, LST_PBB (lst));
-}
-
/* Return true when the nest starting at LOOP1 and ending on LOOP2 is
perfect: i.e. there are no sequence of statements. */
lst_remove_all_before_excluding_pbb (*nest, last, false);
if (lst_empty_p (*before))
- *before = NULL;
+ {
+ free_lst (*before);
+ *before = NULL;
+ }
if (lst_empty_p (*after))
- *after = NULL;
+ {
+ free_lst (*after);
+ *after = NULL;
+ }
if (lst_empty_p (*nest))
- *nest = NULL;
+ {
+ free_lst (*nest);
+ *nest = NULL;
+ }
}
/* Try to interchange LOOP1 with LOOP2 for all the statements of the
body of LOOP2. LOOP1 contains LOOP2. Return true if it did the
- interchange. CREATED_LOOP_BEFORE/CREATED_LOOP_AFTER are set to
- true if the loop distribution created a loop before/after LOOP1. */
+ interchange. */
static bool
-lst_try_interchange_loops (scop_p scop, lst_p loop1, lst_p loop2,
- lst_p *before, lst_p *nest, lst_p *after)
+lst_try_interchange_loops (scop_p scop, lst_p loop1, lst_p loop2)
{
int depth1 = lst_depth (loop1);
int depth2 = lst_depth (loop2);
lst_p transformed;
- *before = NULL;
- *after = NULL;
- *nest = NULL;
+ lst_p before = NULL, nest = NULL, after = NULL;
+
+ if (!lst_perfectly_nested_p (loop1, loop2))
+ lst_perfect_nestify (loop1, loop2, &before, &nest, &after);
if (!lst_interchange_profitable_p (loop2, depth1, depth2))
return false;
- if (!lst_perfectly_nested_p (loop1, loop2))
- lst_perfect_nestify (loop1, loop2, before, nest, after);
-
lst_apply_interchange (loop2, depth1, depth2);
/* Sync the transformed LST information and the PBB scatterings
before using the scatterings in the data dependence analysis. */
- if (*before || *nest || *after)
+ if (before || nest || after)
{
transformed = lst_substitute_3 (SCOP_TRANSFORMED_SCHEDULE (scop), loop1,
- *before, *nest, *after);
+ before, nest, after);
lst_update_scattering (transformed);
free_lst (transformed);
}
depth1, depth2);
/* Transform the SCOP_TRANSFORMED_SCHEDULE of the SCOP. */
- lst_insert_in_sequence (*before, loop1, true);
- lst_insert_in_sequence (*after, loop1, false);
+ lst_insert_in_sequence (before, loop1, true);
+ lst_insert_in_sequence (after, loop1, false);
- if (*nest)
+ if (nest)
{
- lst_replace (loop1, *nest);
+ lst_replace (loop1, nest);
free_lst (loop1);
}
}
/* Undo the transform. */
+ free_lst (before);
+ free_lst (nest);
+ free_lst (after);
lst_apply_interchange (loop2, depth2, depth1);
- *before = NULL;
- *after = NULL;
- *nest = NULL;
return false;
}
-static bool lst_interchange_select_inner (scop_p, lst_p, int, lst_p);
-
-/* Try to interchange loop OUTER of LST_SEQ (OUTER_FATHER) with all
- the loop INNER and with all the loops contained in the body of
- INNER. Return true if it did interchanged some loops. */
-
-static bool
-lst_try_interchange (scop_p scop, lst_p outer_father, int outer, lst_p inner)
-{
- lst_p before, nest, after;
- bool res;
- lst_p loop1 = VEC_index (lst_p, LST_SEQ (outer_father), outer);
- lst_p loop2 = inner;
-
- gcc_assert (LST_LOOP_P (loop1)
- && LST_LOOP_P (loop2));
-
- res = lst_try_interchange_loops (scop, loop1, loop2, &before, &nest, &after);
-
- if (before)
- res |= lst_interchange_select_inner (scop, outer_father, outer, before);
- else if (nest)
- res |= lst_interchange_select_inner (scop, outer_father, outer, nest);
- else
- res |= lst_interchange_select_inner (scop, outer_father, outer, loop2);
-
- return res;
-}
-
/* Selects the inner loop in LST_SEQ (INNER_FATHER) to be interchanged
with the loop OUTER in LST_SEQ (OUTER_FATHER). */
lst_interchange_select_inner (scop_p scop, lst_p outer_father, int outer,
lst_p inner_father)
{
- lst_p l;
- bool res = false;
int inner;
+ lst_p loop1, loop2;
gcc_assert (outer_father
&& LST_LOOP_P (outer_father)
&& inner_father
&& LST_LOOP_P (inner_father));
- for (inner = 0; VEC_iterate (lst_p, LST_SEQ (inner_father), inner, l); inner++)
- if (LST_LOOP_P (l))
- res |= lst_try_interchange (scop, outer_father, outer, l);
+ loop1 = VEC_index (lst_p, LST_SEQ (outer_father), outer);
- return res;
+ FOR_EACH_VEC_ELT (lst_p, LST_SEQ (inner_father), inner, loop2)
+ if (LST_LOOP_P (loop2)
+ && (lst_try_interchange_loops (scop, loop1, loop2)
+ || lst_interchange_select_inner (scop, outer_father, outer, loop2)))
+ return true;
+
+ return false;
}
/* Interchanges all the loops of LOOP and the loops of its body that
- are considered profitable to interchange. Return true if it did
- interchanged some loops. OUTER is the index in LST_SEQ (LOOP) that
+ are considered profitable to interchange. Return the number of
+ interchanged loops. OUTER is the index in LST_SEQ (LOOP) that
points to the next outer loop to be considered for interchange. */
-static bool
+static int
lst_interchange_select_outer (scop_p scop, lst_p loop, int outer)
{
lst_p l;
- bool res = false;
+ int res = 0;
int i = 0;
lst_p father;
if (!loop || !LST_LOOP_P (loop))
- return false;
+ return 0;
father = LST_LOOP_FATHER (loop);
if (father)
{
- res = lst_interchange_select_inner (scop, father, outer, loop);
-
- if (VEC_length (lst_p, LST_SEQ (father)) <= (unsigned) outer)
- return res;
-
- loop = VEC_index (lst_p, LST_SEQ (father), outer);
+ while (lst_interchange_select_inner (scop, father, outer, loop))
+ {
+ res++;
+ loop = VEC_index (lst_p, LST_SEQ (father), outer);
+ }
}
if (LST_LOOP_P (loop))
- for (i = 0; VEC_iterate (lst_p, LST_SEQ (loop), i, l); i++)
+ FOR_EACH_VEC_ELT (lst_p, LST_SEQ (loop), i, l)
if (LST_LOOP_P (l))
- res |= lst_interchange_select_outer (scop, l, i);
+ res += lst_interchange_select_outer (scop, l, i);
return res;
}
-/* Interchanges all the loop depths that are considered profitable for SCOP. */
+/* Interchanges all the loop depths that are considered profitable for
+ SCOP. Return the number of interchanged loops. */
-bool
+int
scop_do_interchange (scop_p scop)
{
- bool res = lst_interchange_select_outer
+ int res = lst_interchange_select_outer
(scop, SCOP_TRANSFORMED_SCHEDULE (scop), 0);
lst_update_scattering (SCOP_TRANSFORMED_SCHEDULE (scop));
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