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83 lines
3.4 KiB
83 lines
3.4 KiB
from typing import cast
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from dataclasses import dataclass, field
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from collections import deque, defaultdict
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from tinygrad.uop.ops import UOp, Variable, Ops, buffers
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from tinygrad.device import Device, Buffer, MultiBuffer
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from tinygrad.helpers import Metadata, all_same
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# **** ScheduleItem return type
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@dataclass(frozen=True)
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class ScheduleItem:
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ast: UOp
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bufs: tuple[Buffer, ...]
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metadata: tuple[Metadata, ...] = ()
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fixedvars: dict[Variable, int] = field(default_factory=dict)
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# **** schedule linearizer
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def create_schedule_with_vars(sched_sink:UOp) -> tuple[list[ScheduleItem], dict[Variable, int]]:
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# construct the KERNEL children graph based on assigns
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children: defaultdict[UOp, list[UOp]] = defaultdict(list)
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in_degree: dict[UOp, int] = {}
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var_vals: dict[Variable, int] = {}
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for u in sched_sink.toposort():
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if u.op is not Ops.ASSIGN: continue # anything that's not an ASSIGN doesn't write a kernel, so we can skip
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k = u.src[1]
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in_degree.setdefault(k, 0)
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for s in k.src:
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if s.op is Ops.ASSIGN:
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children[s.src[1]].append(k)
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in_degree[k] += 1
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elif s.op in {Ops.MSELECT, Ops.MSTACK}:
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for ss in s.src:
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if ss.op is Ops.MSELECT: ss = ss.src[0]
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if ss.op is not Ops.BUFFER:
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assert ss.op is Ops.ASSIGN
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children[ss.src[1]].append(k)
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in_degree[k] += 1
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elif s.op is Ops.BUFFER:
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pass # a BUFFER is already realized, nothing to do here
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elif s.op is Ops.BIND:
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var, val = s.unbind()
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assert var not in var_vals or var_vals[var] == val, f"bind mismatch on {var}, {var_vals[var]} != {val}"
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var_vals[var] = val
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else:
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raise RuntimeError(f"input to kernel must be ASSIGN or BUFFER, not {s.op}")
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# linearize KERNEL UOps into ScheduleItems in BFS order
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def _heuristic(k: UOp):
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if k.arg.ast.op is Ops.COPY and not all_same([Device[cast(Buffer, s.buf_uop.buffer).device].group_id for s in k.src]): return 1000
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return 0
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last_heuristic: int = 0
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queues: defaultdict[int, deque[UOp]] = defaultdict(deque)
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last_queue: deque[UOp] = deque()
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for k,v in in_degree.items():
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if v == 0: queues[_heuristic(k)].append(k)
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schedule: list[ScheduleItem] = []
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while last_queue or any(queues.values()):
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if not last_queue: last_heuristic, last_queue = min((it for it in queues.items() if it[1]), key=lambda x: abs(x[0]-last_heuristic))
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k = last_queue.popleft()
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ast = k.arg.ast
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# create subbuffers if needed
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if ast.op is Ops.BUFFER_VIEW:
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base = k.src[1].buf_uop.buffer
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assert isinstance(base, Buffer), "base can't be MultiBuffer"
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buffers[k.src[0]] = base.view(k.size, ast.dtype, ast.arg[1]*base.dtype.itemsize)
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ubufs = tuple(s.buf_uop.buffer for s in k.src if s.op is not Ops.BIND)
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if any(isinstance(x, MultiBuffer) for x in ubufs):
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assert all(isinstance(x, MultiBuffer) for x in ubufs), "kernel must all be multibuffer"
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dnums = [x for x in ast.variables() if x.arg[0] == '_device_num']
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for i,bufs in enumerate(zip(*[x.bufs for x in cast(tuple[MultiBuffer, ...], ubufs)])):
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schedule.append(ScheduleItem(ast, bufs, k.arg.metadata, {dnums[0]:i} if len(dnums) else {}))
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else:
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# ONE -> ONE
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schedule.append(ScheduleItem(ast, cast(tuple[Buffer, ...], ubufs), k.arg.metadata))
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for x in children[k]:
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in_degree[x] -= 1
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if in_degree[x] == 0: queues[_heuristic(x)].append(x)
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return schedule, var_vals
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