def emit_sequential_loop(self, codegen_state, iname, iname_dtype,
static_lbound, static_ubound, inner):
ecm = codegen_state.expression_to_code_mapper
from loopy.symbolic import aff_to_expr
from loopy.codegen import wrap_in
from pymbolic.mapper.stringifier import PREC_NONE
from cgen import For
return wrap_in(For,
"%s %s = %s"
% (self.dtype_to_typename(iname_dtype),
iname, ecm(aff_to_expr(static_lbound), PREC_NONE, "i")),
"%s <= %s" % (
iname, ecm(aff_to_expr(static_ubound), PREC_NONE, "i")),
"++%s" % iname,
inner)
def generate_sequential_loop_dim_code(kernel, sched_index, codegen_state):
ecm = codegen_state.expression_to_code_mapper
loop_iname = kernel.schedule[sched_index].iname
slabs = get_slab_decomposition(
kernel, loop_iname, sched_index, codegen_state)
from loopy.codegen.bounds import get_usable_inames_for_conditional
# Note: this does not include loop_iname itself!
usable_inames = get_usable_inames_for_conditional(kernel, sched_index)
domain = kernel.get_inames_domain(loop_iname)
result = []
for slab_name, slab in slabs:
cmt = "%s slab for '%s'" % (slab_name, loop_iname)
if len(slabs) == 1:
cmt = None
# {{{ find bounds
aligned_domain = isl.align_spaces(domain, slab, across_dim_types=True,
obj_bigger_ok=True)
dom_and_slab = aligned_domain & slab
assumptions_non_param = isl.BasicSet.from_params(kernel.assumptions)
dom_and_slab, assumptions_non_param = isl.align_two(
dom_and_slab, assumptions_non_param)
dom_and_slab = dom_and_slab & assumptions_non_param
# move inames that are usable into parameters
moved_inames = []
for iname in dom_and_slab.get_var_names(dim_type.set):
if iname in usable_inames:
moved_inames.append(iname)
dt, idx = dom_and_slab.get_var_dict()[iname]
dom_and_slab = dom_and_slab.move_dims(
dim_type.param, dom_and_slab.dim(dim_type.param),
dt, idx, 1)
_, loop_iname_idx = dom_and_slab.get_var_dict()[loop_iname]
from loopy.isl_helpers import (
static_min_of_pw_aff,
static_max_of_pw_aff)
lbound = (
kernel.cache_manager.dim_min(
dom_and_slab, loop_iname_idx)
.gist(kernel.assumptions)
.coalesce())
ubound = (
kernel.cache_manager.dim_max(
dom_and_slab, loop_iname_idx)
.gist(kernel.assumptions)
.coalesce())
static_lbound = static_min_of_pw_aff(
lbound,
constants_only=False)
static_ubound = static_max_of_pw_aff(
ubound,
constants_only=False)
# }}}
# {{{ find implemented slab, build inner code
from loopy.isl_helpers import make_slab_from_bound_pwaffs
# impl_slab may be overapproximated
impl_slab = make_slab_from_bound_pwaffs(
dom_and_slab.space,
loop_iname, static_lbound, static_ubound)
for iname in moved_inames:
dt, idx = impl_slab.get_var_dict()[iname]
impl_slab = impl_slab.move_dims(
dim_type.set, impl_slab.dim(dim_type.set),
dt, idx, 1)
new_codegen_state = codegen_state.intersect(impl_slab)
inner = build_loop_nest(
intersect_kernel_with_slab(
kernel, slab, iname),
sched_index+1, new_codegen_state)
# }}}
if cmt is not None:
from cgen import Comment
result.append(Comment(cmt))
from cgen import Initializer, POD, Const, Line, For
from loopy.symbolic import aff_to_expr
if (static_ubound - static_lbound).plain_is_zero():
# single-trip, generate just a variable assignment, not a loop
result.append(gen_code_block([
Initializer(Const(POD(kernel.index_dtype, loop_iname)),
ecm(aff_to_expr(static_lbound), PREC_NONE, "i")),
Line(),
inner,
]))
else:
from loopy.codegen import wrap_in
result.append(wrap_in(For,
"%s %s = %s"
% (kernel.target.dtype_to_typename(kernel.index_dtype),
loop_iname, ecm(aff_to_expr(static_lbound), PREC_NONE, "i")),
"%s <= %s" % (
loop_iname, ecm(aff_to_expr(static_ubound), PREC_NONE, "i")),
"++%s" % loop_iname,
inner))
return gen_code_block(result)
