Exemple #1
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def add_inames_to_insn(knl, inames, insn_match):
    """
    :arg inames: a frozenset of inames that will be added to the
        instructions matched by *insn_match*, or a comma-separated
        string that parses to such a tuple.
    :arg insn_match: An instruction match as understood by
        :func:`loopy.match.parse_match`.

    :returns: an :class:`GroupIndexTag` or :class:`LocalIndexTag`
        that is not being used within the instructions matched by
        *insn_match*.

    .. versionadded:: 2016.3
    """

    if isinstance(inames, str):
        inames = frozenset(s.strip() for s in inames.split(","))

    if not isinstance(inames, frozenset):
        raise TypeError("'inames' must be a frozenset")

    from loopy.match import parse_match
    match = parse_match(insn_match)

    new_instructions = []

    for insn in knl.instructions:
        if match(knl, insn):
            new_instructions.append(
                insn.copy(within_inames=insn.within_inames | inames))
        else:
            new_instructions.append(insn)

    return knl.copy(instructions=new_instructions)
Exemple #2
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def tag_instructions(kernel, new_tag, within=None):
    from loopy.match import parse_match
    within = parse_match(within)

    new_insns = []
    for insn in kernel.instructions:
        if within(kernel, insn):
            new_insns.append(insn.copy(tags=insn.tags | frozenset([new_tag])))
        else:
            new_insns.append(insn)

    return kernel.copy(instructions=new_insns)
def add_barrier(kernel,
                insn_before="",
                insn_after="",
                id_based_on=None,
                tags=None,
                synchronization_kind="global",
                mem_kind=None):
    """Takes in a kernel that needs to be added a barrier and returns a kernel
    which has a barrier inserted into it. It takes input of 2 instructions and
    then adds a barrier in between those 2 instructions. The expressions can
    be any inputs that are understood by :func:`loopy.match.parse_match`.

    :arg insn_before: String expression that specifies the instruction(s)
        before the barrier which is to be added
    :arg insn_after: String expression that specifies the instruction(s) after
        the barrier which is to be added
    :arg id: String on which the id of the barrier would be based on.
    :arg tags: The tag of the group to which the barrier must be added
    :arg synchronization_kind: Kind of barrier to be added. May be "global" or
        "local"
    :arg kind: Type of memory to be synchronied. May be "global" or "local". Ignored
        for "global" bariers.  If not supplied, defaults to *synchronization_kind*
    """

    if mem_kind is None:
        mem_kind = synchronization_kind

    if id_based_on is None:
        id = kernel.make_unique_instruction_id(
            based_on=synchronization_kind[0] + "_barrier")
    else:
        id = kernel.make_unique_instruction_id(based_on=id_based_on)

    match = parse_match(insn_before)
    insn_before_list = [
        insn.id for insn in kernel.instructions if match(kernel, insn)
    ]

    barrier_to_add = BarrierInstruction(
        depends_on=frozenset(insn_before_list),
        depends_on_is_final=True,
        id=id,
        tags=tags,
        synchronization_kind=synchronization_kind,
        mem_kind=mem_kind)

    new_kernel = kernel.copy(instructions=kernel.instructions +
                             [barrier_to_add])
    new_kernel = add_dependency(kernel=new_kernel,
                                insn_match=insn_after,
                                depends_on="id:" + id)

    return new_kernel
Exemple #4
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def map_instructions(kernel, insn_match, f):
    from loopy.match import parse_match
    match = parse_match(insn_match)

    new_insns = []

    for insn in kernel.instructions:
        if match(kernel, insn):
            new_insns.append(f(insn))
        else:
            new_insns.append(insn)

    return kernel.copy(instructions=new_insns)
Exemple #5
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def map_instructions(kernel, insn_match, f):
    from loopy.match import parse_match
    match = parse_match(insn_match)

    new_insns = []

    for insn in kernel.instructions:
        if match(kernel, insn):
            new_insns.append(f(insn))
        else:
            new_insns.append(insn)

    return kernel.copy(instructions=new_insns)
Exemple #6
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def tag_instructions(kernel, new_tag, within=None):
    from loopy.match import parse_match
    within = parse_match(within)

    new_insns = []
    for insn in kernel.instructions:
        if within(kernel, insn):
            new_insns.append(
                    insn.copy(tags=insn.tags | frozenset([new_tag])))
        else:
            new_insns.append(insn)

    return kernel.copy(instructions=new_insns)
Exemple #7
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def tag_instructions(kernel, new_tag, within=None):
    from loopy.match import parse_match
    within = parse_match(within)

    from loopy.kernel.creation import _normalize_tags
    new_tags = _normalize_tags([new_tag])

    new_insns = []
    for insn in kernel.instructions:
        if within(kernel, insn):
            new_insns.append(insn.copy(tags=insn.tags | new_tags))
        else:
            new_insns.append(insn)

    return kernel.copy(instructions=new_insns)
Exemple #8
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def add_barrier(knl, insn_before="", insn_after="", id_based_on=None,
                tags=None, synchronization_kind="global", mem_kind=None):
    """Takes in a kernel that needs to be added a barrier and returns a kernel
    which has a barrier inserted into it. It takes input of 2 instructions and
    then adds a barrier in between those 2 instructions. The expressions can
    be any inputs that are understood by :func:`loopy.match.parse_match`.

    :arg insn_before: String expression that specifies the instruction(s)
        before the barrier which is to be added
    :arg insn_after: String expression that specifies the instruction(s) after
        the barrier which is to be added
    :arg id: String on which the id of the barrier would be based on.
    :arg tags: The tag of the group to which the barrier must be added
    :arg synchronization_kind: Kind of barrier to be added. May be "global" or
        "local"
    :arg kind: Type of memory to be synchronied. May be "global" or "local". Ignored
        for "global" bariers.  If not supplied, defaults to *synchronization_kind*
    """

    if mem_kind is None:
        mem_kind = synchronization_kind

    if id_based_on is None:
        id = knl.make_unique_instruction_id(
            based_on=synchronization_kind[0]+"_barrier")
    else:
        id = knl.make_unique_instruction_id(based_on=id_based_on)

    match = parse_match(insn_before)
    insn_before_list = [insn.id for insn in knl.instructions if match(knl,
                        insn)]

    barrier_to_add = BarrierInstruction(depends_on=frozenset(insn_before_list),
                                        depends_on_is_final=True,
                                        id=id,
                                        tags=tags,
                                        synchronization_kind=synchronization_kind,
                                        mem_kind=mem_kind)

    new_knl = knl.copy(instructions=knl.instructions + [barrier_to_add])
    new_knl = add_dependency(kernel=new_knl,
                             insn_match=insn_after,
                             depends_on="id:"+id)

    return new_knl
Exemple #9
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def find_unused_axis_tag(kernel, kind, insn_match=None):
    """For one of the hardware-parallel execution tags, find an unused
    axis.

    :arg insn_match: An instruction match as understood by
        :func:`loopy.match.parse_match`.
    :arg kind: may be "l" or "g", or the corresponding tag class name

    :returns: an :class:`GroupIndexTag` or :class:`LocalIndexTag`
        that is not being used within the instructions matched by
        *insn_match*.
    """
    used_axes = set()

    from looopy.kernel.data import GroupIndexTag, LocalIndexTag

    if isinstance(kind, str):
        found = False
        for cls in [GroupIndexTag, LocalIndexTag]:
            if kind == cls.print_name:
                kind = cls
                found = True
                break

        if not found:
            raise LoopyError("invlaid tag kind: %s" % kind)

    from loopy.match import parse_match
    match = parse_match(insn_match)
    insns = [insn for insn in kernel.instructions if match(kernel, insn)]

    for insn in insns:
        for iname in kernel.insn_inames(insn):
            dim_tag = kernel.iname_to_tag.get(iname)

            if isinstance(dim_tag, kind):
                used_axes.add(kind.axis)

    i = 0
    while i in used_axes:
        i += 1

    return kind(i)
Exemple #10
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def find_instructions(kernel, insn_match):
    from loopy.match import parse_match
    match = parse_match(insn_match)
    return [insn for insn in kernel.instructions if match(kernel, insn)]
Exemple #11
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def extract_subst(kernel, subst_name, template, parameters=(), within=None):
    """
    :arg subst_name: The name of the substitution rule to be created.
    :arg template: Unification template expression.
    :arg parameters: An iterable of parameters used in
        *template*, or a comma-separated string of the same.
    :arg within: An instance of :class:`loopy.match.MatchExpressionBase` or
        :class:`str` as understood by :func:`loopy.match.parse_match`.

    All targeted subexpressions must match ('unify with') *template*
    The template may contain '*' wildcards that will have to match exactly across all
    unifications.
    """

    if isinstance(kernel, TranslationUnit):
        kernel_names = [
            i for i, clbl in kernel.callables_table.items()
            if isinstance(clbl, CallableKernel)
        ]
        if len(kernel_names) != 1:
            raise LoopyError()

        return kernel.with_kernel(
            extract_subst(kernel[kernel_names[0]], subst_name, template,
                          parameters))

    if isinstance(template, str):
        from pymbolic import parse
        template = parse(template)

    if isinstance(parameters, str):
        parameters = tuple(s.strip() for s in parameters.split(","))

    from loopy.match import parse_match
    within = parse_match(within)

    var_name_gen = kernel.get_var_name_generator()

    # {{{ replace any wildcards in template with new variables

    def get_unique_var_name():
        based_on = subst_name + "_wc"

        result = var_name_gen(based_on)
        return result

    from loopy.symbolic import WildcardToUniqueVariableMapper
    wc_map = WildcardToUniqueVariableMapper(get_unique_var_name)
    template = wc_map(template)

    # }}}

    # {{{ gather up expressions

    expr_descriptors = []

    from loopy.symbolic import UnidirectionalUnifier
    unif = UnidirectionalUnifier(lhs_mapping_candidates=set(parameters))

    def gather_exprs(expr, mapper):
        urecs = unif(template, expr)

        if urecs:
            if len(urecs) > 1:
                raise RuntimeError(
                    "ambiguous unification of '%s' with template '%s'" %
                    (expr, template))

            urec, = urecs

            expr_descriptors.append(
                ExprDescriptor(insn=insn,
                               expr=expr,
                               unif_var_dict={
                                   lhs.name: rhs
                                   for lhs, rhs in urec.equations
                               }))
        else:
            mapper.fallback_mapper(expr)
            # can't nest, don't recurse

    from loopy.symbolic import (CallbackMapper, WalkMapper, IdentityMapper)
    dfmapper = CallbackMapper(gather_exprs, WalkMapper())

    from loopy.kernel.instruction import MultiAssignmentBase
    for insn in kernel.instructions:
        if isinstance(insn, MultiAssignmentBase) and within(kernel, insn):
            dfmapper(insn.assignees)
            dfmapper(insn.expression)

    for sr in kernel.substitutions.values():
        dfmapper(sr.expression)

    # }}}

    if not expr_descriptors:
        raise RuntimeError("no expressions matching '%s'" % template)

    # {{{ substitute rule into instructions

    def replace_exprs(expr, mapper):
        found = False
        for exprd in expr_descriptors:
            if expr is exprd.expr:
                found = True
                break

        if not found:
            return mapper.fallback_mapper(expr)

        args = [exprd.unif_var_dict[arg_name] for arg_name in parameters]

        result = var(subst_name)
        if args:
            result = result(*args)

        return result
        # can't nest, don't recurse

    cbmapper = CallbackMapper(replace_exprs, IdentityMapper())

    new_insns = []

    def transform_assignee(expr):
        # Assignment LHS's cannot be subst rules. Treat them
        # specially.

        import pymbolic.primitives as prim
        if isinstance(expr, tuple):
            return tuple(transform_assignee(expr_i) for expr_i in expr)

        elif isinstance(expr, prim.Subscript):
            return type(expr)(expr.aggregate, cbmapper(expr.index))

        elif isinstance(expr, prim.Variable):
            return expr
        else:
            raise ValueError("assignment LHS not understood")

    for insn in kernel.instructions:
        if within(kernel, insn):
            new_insns.append(
                insn.with_transformed_expressions(
                    cbmapper, assignee_f=transform_assignee))
        else:
            new_insns.append(insn)

    from loopy.kernel.data import SubstitutionRule
    new_substs = {
        subst_name:
        SubstitutionRule(
            name=subst_name,
            arguments=tuple(parameters),
            expression=template,
        )
    }

    for subst in kernel.substitutions.values():
        new_substs[subst.name] = subst.copy(
            expression=cbmapper(subst.expression))

    # }}}

    return kernel.copy(instructions=new_insns, substitutions=new_substs)
Exemple #12
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def find_instructions(kernel, insn_match):
    from loopy.match import parse_match
    match = parse_match(insn_match)
    return [insn for insn in kernel.instructions if match(kernel, insn)]
Exemple #13
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def find_instructions_in_single_kernel(kernel, insn_match):
    assert isinstance(kernel, LoopKernel)
    from loopy.match import parse_match
    match = parse_match(insn_match)
    return [insn for insn in kernel.instructions if match(kernel, insn)]
Exemple #14
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def remove_instructions(kernel, insn_ids):
    """Return a new kernel with instructions in *insn_ids* removed.

    Dependencies across deleted instructions are transitively propagated i.e.
    if insn_a depends on insn_b that depends on insn_c and  'insn_b' is to be
    removed then the returned kernel will have a dependency from 'insn_a' to
    'insn_c'.

    This also updates *no_sync_with* for all instructions.

    :arg insn_ids: An instance of :class:`set` or :class:`str` as
        understood by :func:`loopy.match.parse_match` or
        :class:`loopy.match.MatchExpressionBase`.
    """
    from functools import reduce

    if not insn_ids:
        return kernel

    from loopy.match import MatchExpressionBase

    if isinstance(insn_ids, str):
        from loopy.match import parse_match
        insn_ids = parse_match(insn_ids)
    if isinstance(insn_ids, MatchExpressionBase):
        within = insn_ids

        insn_ids = set(
            [insn.id for insn in kernel.instructions if within(kernel, insn)])

    assert isinstance(insn_ids, set)
    id_to_insn = kernel.id_to_insn

    # {{{ for each insn_id to be removed get deps in terms of remaining insns

    # transitive_deps: mapping from insn_id (referred as I) to be removed to
    # frozenset of insn_ids that won't be removed (referred as R(I)). 'R(I)' are
    # the transitive dependencies of 'I' that won't be removed.

    transitive_deps = {}
    insns_not_to_be_removed = frozenset(id_to_insn) - insn_ids

    for insn_id in _toposort_of_subset_of_insns(kernel, insn_ids):
        assert id_to_insn[insn_id].depends_on <= (insns_not_to_be_removed
                                                  | frozenset(transitive_deps))
        transitive_deps[insn_id] = reduce(
            frozenset.union, (transitive_deps.get(d, frozenset([d]))
                              for d in id_to_insn[insn_id].depends_on),
            frozenset())

    # }}}

    new_insns = []
    for insn in kernel.instructions:
        if insn.id in insn_ids:
            continue

        # transitively propagate dependencies
        if insn.depends_on is None:
            depends_on = frozenset()
        else:
            depends_on = insn.depends_on

        new_deps = reduce(frozenset.union,
                          (transitive_deps.get(d, frozenset([d]))
                           for d in depends_on), frozenset())

        assert (new_deps & insn_ids) == frozenset()

        # update no_sync_with
        new_no_sync_with = frozenset((insn_id, scope)
                                     for insn_id, scope in insn.no_sync_with
                                     if insn_id not in insn_ids)

        new_insns.append(
            insn.copy(depends_on=new_deps, no_sync_with=new_no_sync_with))

    return kernel.copy(instructions=new_insns)