Merge branch 'new-dependency-and-nest-constraint-semantics-development' of github.com:inducer/loopy into new-dependency-and-nest-constraint-semantics-development

Author: jdsteve2

doc/ref_kernel.rst

@@ -220,6 +220,8 @@ Tag                             Meaning
 Identifiers
 -----------
 
+.. _reserved-identifiers:
+
 Reserved Identifiers
 ^^^^^^^^^^^^^^^^^^^^
 

loopy/schedule/checker/__init__.py

@@ -0,0 +1,141 @@
+__copyright__ = "Copyright (C) 2019 James Stevens"
+
+__license__ = """
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+
+# {{{ create a pairwise schedules for statement pairs
+
+def get_schedules_for_statement_pairs(
+        knl,
+        linearization_items,
+        insn_id_pairs,
+        ):
+    r"""For each statement pair in a subset of all statement pairs found in a
+    linearized kernel, determine the (relative) order in which the statement
+    instances are executed. For each pair, describe this relative ordering with
+    a pair of mappings from statement instances to points in a single
+    lexicographic ordering (a ``pairwise schedule''). When determining the
+    relative ordering, ignore concurrent inames.
+
+    :arg knl: A preprocessed :class:`loopy.kernel.LoopKernel` containing the
+        linearization items that will be used to create a schedule.
+
+    :arg linearization_items: A list of :class:`loopy.schedule.ScheduleItem`
+        (to be renamed to `loopy.schedule.LinearizationItem`) containing
+        all linearization items for which pairwise schedules will be
+        created. To allow usage of this routine during linearization, a
+        truncated (i.e. partial) linearization may be passed through this
+        argument.
+
+    :arg insn_id_pairs: A list containing pairs of instruction
+        identifiers.
+
+    :returns: A dictionary mapping each two-tuple of instruction identifiers
+        provided in `insn_id_pairs` to a corresponding two-tuple containing two
+        :class:`islpy.Map`\ s representing a pairwise schedule as two
+        mappings from statement instances to lexicographic time, one for
+        each of the two statements.
+
+    .. doctest:
+
+        >>> import loopy as lp
+        >>> import numpy as np
+        >>> # Make kernel -----------------------------------------------------------
+        >>> knl = lp.make_kernel(
+        ...     "{[i,j,k]: 0<=i<pi and 0<=j<pj and 0<=k<pk}",
+        ...     [
+        ...         "a[i,j] = j  {id=insn_a}",
+        ...         "b[i,k] = k+a[i,0]  {id=insn_b,dep=insn_a}",
+        ...     ])
+        >>> knl = lp.add_and_infer_dtypes(knl, {"a": np.float32, "b": np.float32})
+        >>> knl = lp.prioritize_loops(knl, "i,j")
+        >>> knl = lp.prioritize_loops(knl, "i,k")
+        >>> # Get a linearization
+        >>> knl = lp.get_one_linearized_kernel(lp.preprocess_kernel(knl))
+        >>> # Get a pairwise schedule -----------------------------------------------
+        >>> from loopy.schedule.checker import get_schedules_for_statement_pairs
+        >>> # Get two maps ----------------------------------------------------------
+        >>> schedules = get_schedules_for_statement_pairs(
+        ...     knl,
+        ...     knl.linearization,
+        ...     [("insn_a", "insn_b")],
+        ...     )
+        >>> # Print maps
+        >>> print("\n".join(
+        ...     str(m).replace("{ ", "{\n").replace(" :", "\n:")
+        ...     for m in schedules[("insn_a", "insn_b")]
+        ...     ))
+        [pi, pj, pk] -> {
+        [_lp_linchk_stmt = 0, i, j, k] -> [_lp_linchk_l0 = i, _lp_linchk_l1 = 0]
+        : 0 <= i < pi and 0 <= j < pj and 0 <= k < pk }
+        [pi, pj, pk] -> {
+        [_lp_linchk_stmt = 1, i, j, k] -> [_lp_linchk_l0 = i, _lp_linchk_l1 = 1]
+        : 0 <= i < pi and 0 <= j < pj and 0 <= k < pk }
+
+    """
+
+    # {{{ make sure kernel has been preprocessed
+
+    from loopy.kernel import KernelState
+    assert knl.state in [
+            KernelState.PREPROCESSED,
+            KernelState.LINEARIZED]
+
+    # }}}
+
+    # {{{ Find any EnterLoop inames that are tagged as concurrent
+    # so that generate_pairwise_schedule() knows to ignore them
+    # (In the future, this shouldn't be necessary because there
+    # won't be any inames with ConcurrentTags in EnterLoop linearization items.
+    # Test which exercises this: test_linearization_checker_with_stroud_bernstein())
+    from loopy.schedule.checker.utils import (
+        partition_inames_by_concurrency,
+        get_EnterLoop_inames,
+    )
+    conc_inames, _ = partition_inames_by_concurrency(knl)
+    enterloop_inames = get_EnterLoop_inames(linearization_items)
+    conc_loop_inames = conc_inames & enterloop_inames
+
+    # The only concurrent EnterLoop inames should be Vec and ILP
+    from loopy.kernel.data import (VectorizeTag, IlpBaseTag)
+    for conc_iname in conc_loop_inames:
+        # Assert that there exists an ilp or vectorize tag (out of the
+        # potentially multiple other tags on this concurrent iname).
+        assert any(
+            isinstance(tag, (VectorizeTag, IlpBaseTag))
+            for tag in knl.iname_to_tags[conc_iname])
+
+    # }}}
+
+    # {{{ Create two mappings from {statement instance: lex point}
+
+    # include only instructions involved in this dependency
+    from loopy.schedule.checker.schedule import generate_pairwise_schedules
+    return generate_pairwise_schedules(
+        knl,
+        linearization_items,
+        insn_id_pairs,
+        loops_to_ignore=conc_loop_inames,
+        )
+
+    # }}}
+
+# }}}