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319 | class SequencePass(LoopletPass):
"""
Lowers one Sequence looplet at the time.
"""
@property
def priority(self):
return 4
@classmethod
def get_sequence_variations(
cls, ctx, seqs: list[Sequence], heads, tails, ext: SymbolicExtent
) -> list[tuple]:
ext_start, ext_end = ext.get_start(), ext.get_end()
match seqs:
case []:
return [(heads, tails, ext_start, ext_end)]
case [Sequence() as seq, *tail]:
split = seq.split(ctx, ext)
left = cls.get_sequence_variations(
ctx,
tail,
heads + [seq],
tails,
SymbolicExtent(
ext_start,
ntn.Call(ntn.L(ffuncs.min), (ext_end, split)),
),
)
right = cls.get_sequence_variations(
ctx,
tail,
heads,
tails + [seq],
SymbolicExtent(
ntn.Call(ntn.L(ffuncs.max), (ext_start, split)),
ext_end,
),
)
return left + right
case other:
raise Exception(f"Invalid sequence: {other}")
def __call__(self, ctx: LoopletContext, idx, ext: SymbolicExtent, body):
found_seqs: list[Sequence] = []
for node in PostOrderDFS(body):
match node:
case ntn.Looplet(Sequence() as seq, _):
found_seqs.append(seq)
found_seqs = list({id(seq): seq for seq in found_seqs}.values())
def sequence_node(
node: ntn.NotationNode, heads: set[Sequence], tails: set[Sequence]
):
match node:
case ntn.Access(
ntn.Looplet(Sequence() as tns, type_), mode, (j, *idxs)
) if j == idx:
if tns in heads:
new_tns = tns.head(ctx, idx) # type: ignore[call-arg]
elif tns in tails:
new_tns = tns.tail(ctx, idx)
else:
raise Exception(f"Seq: {tns} not present.")
return ntn.Access(ntn.Looplet(new_tns, type_), mode, (j, *idxs))
variations = self.get_sequence_variations(ctx, found_seqs, [], [], ext)
blocks = []
for v in variations:
heads, tails, subext_start, subext_end = v
sub_body = PostWalk(partial(sequence_node, heads=heads, tails=tails))(body)
subext = SymbolicExtent(subext_start, subext_end)
sub_ctx = ctx.scope()
sub_ctx(subext, self.looplet_simplify(sub_body))
blocks += sub_ctx.emit()
ctx.exec(asm.Block(tuple(blocks)))
|