#include "graphite-poly.h"
-/* Strip mines with a factor STRIDE the loop around PBB at depth
- LOOP_DEPTH. The following example comes from the wiki page:
+/* Strip mines with a factor STRIDE the scattering (time) dimension
+ around PBB at depth TIME_DEPTH.
+
+ The following example comes from the wiki page:
http://gcc.gnu.org/wiki/Graphite/Strip_mine
The strip mine of a loop with a tile of 64 can be obtained with a
*/
static bool
-pbb_strip_mine_loop_depth (poly_bb_p pbb, int loop_depth, int stride)
+pbb_strip_mine_time_depth (poly_bb_p pbb, int time_depth, int stride)
{
- ppl_dimension_type iter, dim;
+ ppl_dimension_type iter, dim, strip;
ppl_Polyhedron_t res = PBB_TRANSFORMED_SCATTERING (pbb);
- ppl_dimension_type strip = psct_scattering_dim_for_loop_depth (pbb,
- loop_depth);
+ /* STRIP is the dimension that iterates with stride STRIDE. */
+ /* ITER is the dimension that enumerates single iterations inside
+ one strip that has at most STRIDE iterations. */
+ strip = time_depth;
+ iter = strip + 2;
psct_add_scattering_dimension (pbb, strip);
+ psct_add_scattering_dimension (pbb, strip + 1);
- iter = psct_iterator_dim (pbb, loop_depth);
ppl_Polyhedron_space_dimension (res, &dim);
/* Lower bound of the striped loop. */
ppl_delete_Constraint (new_cstr);
}
+ /* Static scheduling for ITER level.
+ This is mandatory to keep the 2d + 1 canonical scheduling format. */
+ {
+ ppl_Constraint_t new_cstr;
+ ppl_Linear_Expression_t expr;
+
+ ppl_new_Linear_Expression_with_dimension (&expr, dim);
+ ppl_set_coef (expr, strip + 1, 1);
+ ppl_set_inhomogeneous (expr, 0);
+
+ ppl_new_Constraint (&new_cstr, expr, PPL_CONSTRAINT_TYPE_EQUAL);
+ ppl_delete_Linear_Expression (expr);
+ ppl_Polyhedron_add_constraint (res, new_cstr);
+ ppl_delete_Constraint (new_cstr);
+ }
+
return true;
}
/* Returns true when strip mining with STRIDE of the loop around PBB
- at depth LOOP_DEPTH is profitable. */
+ at DEPTH is profitable. */
static bool
pbb_strip_mine_profitable_p (poly_bb_p pbb,
- graphite_dim_t loop_depth,
+ graphite_dim_t depth,
int stride)
{
- Value niter, strip_stride;
+ mpz_t niter, strip_stride;
bool res;
- value_init (strip_stride);
- value_init (niter);
- value_set_si (strip_stride, stride);
- pbb_number_of_iterations (pbb, loop_depth, niter);
- res = value_gt (niter, strip_stride);
- value_clear (strip_stride);
- value_clear (niter);
+ mpz_init (strip_stride);
+ mpz_init (niter);
+ mpz_set_si (strip_stride, stride);
+ pbb_number_of_iterations_at_time (pbb, psct_dynamic_dim (pbb, depth), niter);
+ res = (mpz_cmp (niter, strip_stride) > 0);
+ mpz_clear (strip_stride);
+ mpz_clear (niter);
return res;
}
-/* Strip mines all the loops around PBB. Nothing profitable in all this:
- this is just a driver function. */
+/* Strip-mines all the loops of LST that are considered profitable to
+ strip-mine. Return true if it did strip-mined some loops. */
static bool
-pbb_do_strip_mine (poly_bb_p pbb)
+lst_do_strip_mine_loop (lst_p lst, int depth)
{
- graphite_dim_t loop_depth;
- int stride = 64;
- bool transform_done = false;
+ int i;
+ lst_p l;
+ int stride = PARAM_VALUE (PARAM_LOOP_BLOCK_TILE_SIZE);
+ poly_bb_p pbb;
- for (loop_depth = 0; loop_depth < pbb_dim_iter_domain (pbb); loop_depth++)
- if (pbb_strip_mine_profitable_p (pbb, loop_depth, stride))
- transform_done |= pbb_strip_mine_loop_depth (pbb, loop_depth, stride);
+ if (!lst)
+ return false;
- return transform_done;
+ if (LST_LOOP_P (lst))
+ {
+ bool res = false;
+
+ for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
+ res |= lst_do_strip_mine_loop (l, depth);
+
+ return res;
+ }
+
+ pbb = LST_PBB (lst);
+ return pbb_strip_mine_time_depth (pbb, psct_dynamic_dim (pbb, depth),
+ stride);
+}
+
+/* Strip-mines all the loops of LST that are considered profitable to
+ strip-mine. Return true if it did strip-mined some loops. */
+
+static bool
+lst_do_strip_mine (lst_p lst)
+{
+ int i;
+ lst_p l;
+ bool res = false;
+ int stride = PARAM_VALUE (PARAM_LOOP_BLOCK_TILE_SIZE);
+ int depth;
+
+ if (!lst
+ || !LST_LOOP_P (lst))
+ return false;
+
+ for (i = 0; VEC_iterate (lst_p, LST_SEQ (lst), i, l); i++)
+ res |= lst_do_strip_mine (l);
+
+ depth = lst_depth (lst);
+ if (depth >= 0
+ && pbb_strip_mine_profitable_p (LST_PBB (lst_find_first_pbb (lst)),
+ depth, stride))
+ {
+ res |= lst_do_strip_mine_loop (lst, lst_depth (lst));
+ lst_add_loop_under_loop (lst);
+ }
+
+ return res;
}
/* Strip mines all the loops in SCOP. Nothing profitable in all this:
bool
scop_do_strip_mine (scop_p scop)
{
- poly_bb_p pbb;
- int i;
bool transform_done = false;
- for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
- transform_done |= pbb_do_strip_mine (pbb);
+ store_scattering (scop);
+
+ transform_done = lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop));
+
+ if (!transform_done)
+ return false;
+
+ if (!graphite_legal_transform (scop))
+ {
+ restore_scattering (scop);
+ return false;
+ }
return transform_done;
}
+/* Loop blocks all the loops in SCOP. Returns true when we manage to
+ block some loops. */
+
+bool
+scop_do_block (scop_p scop)
+{
+ bool strip_mined = false;
+ bool interchanged = false;
+
+ store_scattering (scop);
+
+ strip_mined = lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop));
+ interchanged = scop_do_interchange (scop);
+
+ /* If we don't interchange loops, then the strip mine is not
+ profitable, and the transform is not a loop blocking. */
+ if (!interchanged
+ || !graphite_legal_transform (scop))
+ {
+ restore_scattering (scop);
+ return false;
+ }
+ else if (strip_mined && interchanged
+ && dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "SCoP will be loop blocked.\n");
+
+ return strip_mined || interchanged;
+}
+
#endif
OSDN Git Service
