453 lines
12 KiB
C
453 lines
12 KiB
C
/* Graphite polyhedral representation.
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Copyright (C) 2009-2023 Free Software Foundation, Inc.
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Contributed by Sebastian Pop <sebastian.pop@amd.com> and
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Tobias Grosser <grosser@fim.uni-passau.de>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GRAPHITE_POLY_H
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#define GCC_GRAPHITE_POLY_H
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#include "sese.h"
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typedef struct poly_dr *poly_dr_p;
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typedef struct poly_bb *poly_bb_p;
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typedef struct scop *scop_p;
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typedef unsigned graphite_dim_t;
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inline graphite_dim_t scop_nb_params (scop_p);
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/* A data reference can write or read some memory or we
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just know it may write some memory. */
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enum poly_dr_type
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{
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PDR_READ,
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/* PDR_MAY_READs are represented using PDR_READS. This does not
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limit the expressiveness. */
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PDR_WRITE,
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PDR_MAY_WRITE
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};
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struct poly_dr
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{
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/* An identifier for this PDR. */
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int id;
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/* The number of data refs identical to this one in the PBB. */
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int nb_refs;
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/* A pointer to the gimple stmt containing this reference. */
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gimple *stmt;
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/* A pointer to the PBB that contains this data reference. */
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poly_bb_p pbb;
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enum poly_dr_type type;
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/* The access polyhedron contains the polyhedral space this data
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reference will access.
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The polyhedron contains these dimensions:
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- The alias set (a):
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Every memory access is classified in at least one alias set.
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- The subscripts (s_0, ..., s_n):
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The memory is accessed using zero or more subscript dimensions.
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- The iteration domain (variables and parameters)
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Do not hardcode the dimensions. Use the following accessor functions:
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- pdr_alias_set_dim
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- pdr_subscript_dim
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- pdr_iterator_dim
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- pdr_parameter_dim
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Example:
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| int A[1335][123];
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| int *p = malloc ();
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| k = ...
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| for i
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| {
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| if (unknown_function ())
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| p = A;
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| ... = p[?][?];
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| for j
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| A[i][j+k] = m;
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| }
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The data access A[i][j+k] in alias set "5" is described like this:
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| i j k a s0 s1 1
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| 0 0 0 1 0 0 -5 = 0
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|-1 0 0 0 1 0 0 = 0
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| 0 -1 -1 0 0 1 0 = 0
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| 0 0 0 0 1 0 0 >= 0 # The last four lines describe the
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| 0 0 0 0 0 1 0 >= 0 # array size.
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| 0 0 0 0 -1 0 1335 >= 0
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| 0 0 0 0 0 -1 123 >= 0
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The pointer "*p" in alias set "5" and "7" is described as a union of
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polyhedron:
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| i k a s0 1
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| 0 0 1 0 -5 = 0
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| 0 0 0 1 0 >= 0
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"or"
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| i k a s0 1
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| 0 0 1 0 -7 = 0
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| 0 0 0 1 0 >= 0
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"*p" accesses all of the object allocated with 'malloc'.
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The scalar data access "m" is represented as an array with zero subscript
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dimensions.
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| i j k a 1
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| 0 0 0 -1 15 = 0
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The difference between the graphite internal format for access data and
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the OpenSop format is in the order of columns.
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Instead of having:
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| i j k a s0 s1 1
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| 0 0 0 1 0 0 -5 = 0
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|-1 0 0 0 1 0 0 = 0
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| 0 -1 -1 0 0 1 0 = 0
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| 0 0 0 0 1 0 0 >= 0 # The last four lines describe the
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| 0 0 0 0 0 1 0 >= 0 # array size.
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| 0 0 0 0 -1 0 1335 >= 0
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| 0 0 0 0 0 -1 123 >= 0
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In OpenScop we have:
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| a s0 s1 i j k 1
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| 1 0 0 0 0 0 -5 = 0
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| 0 1 0 -1 0 0 0 = 0
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| 0 0 1 0 -1 -1 0 = 0
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| 0 1 0 0 0 0 0 >= 0 # The last four lines describe the
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| 0 0 1 0 0 0 0 >= 0 # array size.
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| 0 -1 0 0 0 0 1335 >= 0
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| 0 0 -1 0 0 0 123 >= 0
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The OpenScop access function is printed as follows:
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| 1 # The number of disjunct components in a union of access functions.
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| R C O I L P # Described bellow.
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| a s0 s1 i j k 1
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| 1 0 0 0 0 0 -5 = 0
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| 0 1 0 -1 0 0 0 = 0
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| 0 0 1 0 -1 -1 0 = 0
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| 0 1 0 0 0 0 0 >= 0 # The last four lines describe the
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| 0 0 1 0 0 0 0 >= 0 # array size.
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| 0 -1 0 0 0 0 1335 >= 0
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| 0 0 -1 0 0 0 123 >= 0
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Where:
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- R: Number of rows.
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- C: Number of columns.
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- O: Number of output dimensions = alias set + number of subscripts.
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- I: Number of input dimensions (iterators).
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- L: Number of local (existentially quantified) dimensions.
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- P: Number of parameters.
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In the example, the vector "R C O I L P" is "7 7 3 2 0 1". */
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isl_map *accesses;
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isl_set *subscript_sizes;
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};
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#define PDR_ID(PDR) (PDR->id)
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#define PDR_NB_REFS(PDR) (PDR->nb_refs)
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#define PDR_PBB(PDR) (PDR->pbb)
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#define PDR_TYPE(PDR) (PDR->type)
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#define PDR_ACCESSES(PDR) (NULL)
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void new_poly_dr (poly_bb_p, gimple *, enum poly_dr_type,
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isl_map *, isl_set *);
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void debug_pdr (poly_dr_p);
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void print_pdr (FILE *, poly_dr_p);
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inline bool
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pdr_read_p (poly_dr_p pdr)
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{
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return PDR_TYPE (pdr) == PDR_READ;
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}
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/* Returns true when PDR is a "write". */
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inline bool
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pdr_write_p (poly_dr_p pdr)
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{
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return PDR_TYPE (pdr) == PDR_WRITE;
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}
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/* Returns true when PDR is a "may write". */
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inline bool
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pdr_may_write_p (poly_dr_p pdr)
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{
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return PDR_TYPE (pdr) == PDR_MAY_WRITE;
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}
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/* POLY_BB represents a blackbox in the polyhedral model. */
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struct poly_bb
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{
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/* Pointer to a basic block or a statement in the compiler. */
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gimple_poly_bb_p black_box;
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/* Pointer to the SCOP containing this PBB. */
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scop_p scop;
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/* The iteration domain of this bb. The layout of this polyhedron
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is I|G with I the iteration domain, G the context parameters.
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Example:
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for (i = a - 7*b + 8; i <= 3*a + 13*b + 20; i++)
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for (j = 2; j <= 2*i + 5; j++)
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for (k = 0; k <= 5; k++)
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S (i,j,k)
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Loop iterators: i, j, k
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Parameters: a, b
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| i >= a - 7b + 8
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| i <= 3a + 13b + 20
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| j >= 2
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| j <= 2i + 5
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| k >= 0
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| k <= 5
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The number of variables in the DOMAIN may change and is not
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related to the number of loops in the original code. */
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isl_set *domain;
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isl_set *iterators;
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/* The data references we access. */
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vec<poly_dr_p> drs;
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/* The last basic block generated for this pbb. */
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basic_block new_bb;
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};
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#define PBB_BLACK_BOX(PBB) ((gimple_poly_bb_p) PBB->black_box)
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#define PBB_SCOP(PBB) (PBB->scop)
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#define PBB_DRS(PBB) (PBB->drs)
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extern poly_bb_p new_poly_bb (scop_p, gimple_poly_bb_p);
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extern void print_pbb_domain (FILE *, poly_bb_p);
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extern void print_pbb (FILE *, poly_bb_p);
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extern void print_scop_context (FILE *, scop_p);
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extern void print_scop (FILE *, scop_p);
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extern void debug_pbb_domain (poly_bb_p);
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extern void debug_pbb (poly_bb_p);
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extern void print_pdrs (FILE *, poly_bb_p);
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extern void debug_pdrs (poly_bb_p);
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extern void debug_scop_context (scop_p);
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extern void debug_scop (scop_p);
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extern void print_scop_params (FILE *, scop_p);
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extern void debug_scop_params (scop_p);
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extern void print_iteration_domain (FILE *, poly_bb_p);
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extern void print_iteration_domains (FILE *, scop_p);
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extern void debug_iteration_domain (poly_bb_p);
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extern void debug_iteration_domains (scop_p);
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extern void print_isl_set (FILE *, isl_set *);
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extern void print_isl_map (FILE *, isl_map *);
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extern void print_isl_union_map (FILE *, isl_union_map *);
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extern void print_isl_aff (FILE *, isl_aff *);
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extern void print_isl_constraint (FILE *, isl_constraint *);
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extern void print_isl_schedule (FILE *, isl_schedule *);
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extern void debug_isl_schedule (isl_schedule *);
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extern void print_isl_ast (FILE *, isl_ast_node *);
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extern void debug_isl_ast (isl_ast_node *);
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extern void debug_isl_set (isl_set *);
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extern void debug_isl_map (isl_map *);
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extern void debug_isl_union_map (isl_union_map *);
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extern void debug_isl_aff (isl_aff *);
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extern void debug_isl_constraint (isl_constraint *);
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extern void debug_gmp_value (mpz_t);
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extern void debug_scop_pbb (scop_p scop, int i);
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extern void print_schedule_ast (FILE *, __isl_keep isl_schedule *, scop_p);
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extern void debug_schedule_ast (__isl_keep isl_schedule *, scop_p);
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/* The basic block of the PBB. */
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inline basic_block
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pbb_bb (poly_bb_p pbb)
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{
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return GBB_BB (PBB_BLACK_BOX (pbb));
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}
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inline int
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pbb_index (poly_bb_p pbb)
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{
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return pbb_bb (pbb)->index;
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}
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/* The loop of the PBB. */
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inline loop_p
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pbb_loop (poly_bb_p pbb)
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{
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return gbb_loop (PBB_BLACK_BOX (pbb));
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}
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/* The scop that contains the PDR. */
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inline scop_p
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pdr_scop (poly_dr_p pdr)
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{
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return PBB_SCOP (PDR_PBB (pdr));
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}
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/* Set black box of PBB to BLACKBOX. */
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inline void
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pbb_set_black_box (poly_bb_p pbb, gimple_poly_bb_p black_box)
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{
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pbb->black_box = black_box;
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}
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/* A helper structure to keep track of data references, polyhedral BBs, and
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alias sets. */
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struct dr_info
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{
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enum {
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invalid_alias_set = -1
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};
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/* The data reference. */
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data_reference_p dr;
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/* The polyhedral BB containing this DR. */
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poly_bb_p pbb;
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/* ALIAS_SET is the SCC number assigned by a graph_dfs of the alias graph.
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-1 is an invalid alias set. */
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int alias_set;
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/* Construct a DR_INFO from a data reference DR, an ALIAS_SET, and a PBB. */
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dr_info (data_reference_p dr, poly_bb_p pbb,
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int alias_set = invalid_alias_set)
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: dr (dr), pbb (pbb), alias_set (alias_set) {}
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};
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/* A SCOP is a Static Control Part of the program, simple enough to be
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represented in polyhedral form. */
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struct scop
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{
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/* A SCOP is defined as a SESE region. */
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sese_info_p scop_info;
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/* Number of parameters in SCoP. */
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graphite_dim_t nb_params;
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/* The maximum alias set as assigned to drs by build_alias_sets. */
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unsigned max_alias_set;
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/* All the basic blocks in this scop that contain memory references
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and that will be represented as statements in the polyhedral
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representation. */
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vec<poly_bb_p> pbbs;
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/* All the data references in this scop. */
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vec<dr_info> drs;
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/* The context describes known restrictions concerning the parameters
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and relations in between the parameters.
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void f (int8_t a, uint_16_t b) {
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c = 2 a + b;
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...
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}
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Here we can add these restrictions to the context:
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-128 >= a >= 127
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0 >= b >= 65,535
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c = 2a + b */
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isl_set *param_context;
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/* The context used internally by isl. */
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isl_ctx *isl_context;
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/* SCoP original schedule. */
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isl_schedule *original_schedule;
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/* SCoP transformed schedule. */
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isl_schedule *transformed_schedule;
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/* The data dependence relation among the data references in this scop. */
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isl_union_map *dependence;
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};
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extern scop_p new_scop (edge, edge);
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extern void free_scop (scop_p);
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extern gimple_poly_bb_p new_gimple_poly_bb (basic_block, vec<data_reference_p>,
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vec<scalar_use>, vec<tree>);
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extern bool apply_poly_transforms (scop_p);
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/* Set the region of SCOP to REGION. */
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inline void
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scop_set_region (scop_p scop, sese_info_p region)
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{
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scop->scop_info = region;
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}
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/* Returns the number of parameters for SCOP. */
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inline graphite_dim_t
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scop_nb_params (scop_p scop)
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{
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return scop->nb_params;
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}
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/* Set the number of params of SCOP to NB_PARAMS. */
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inline void
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scop_set_nb_params (scop_p scop, graphite_dim_t nb_params)
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{
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scop->nb_params = nb_params;
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}
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extern void scop_get_dependences (scop_p scop);
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bool
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carries_deps (__isl_keep isl_union_map *schedule,
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__isl_keep isl_union_map *deps,
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int depth);
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extern bool build_poly_scop (scop_p);
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extern bool graphite_regenerate_ast_isl (scop_p);
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extern void build_scops (vec<scop_p> *);
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extern tree cached_scalar_evolution_in_region (const sese_l &, loop_p, tree);
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extern void dot_all_sese (FILE *, vec<sese_l> &);
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extern void dot_sese (sese_l &);
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extern void dot_cfg ();
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#endif
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