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91 lines
3.4 KiB
91 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, UPat, PatternMatcher, graph_rewrite, buffers
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from tinygrad.device import Buffer, MultiBuffer
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from tinygrad.helpers import Metadata, unwrap, merge_dicts
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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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# **** unbind Variables
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def unbind_view(ctx:list[dict[Variable, int]], x:UOp):
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st = unwrap(x.st).simplify()
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if any(x.op is Ops.BIND for x in st.vars()):
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st, var_vals = st.unbind()
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ctx.append(var_vals)
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return x.replace(arg=st)
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return None
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def unbind_bind(ctx:list[dict[Variable, int]], x:UOp):
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var, val = x.unbind()
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ctx.append({var.replace(src=()):val})
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return var
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pm_unbind = PatternMatcher([
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(UPat(Ops.VIEW, name="x"), unbind_view),
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(UPat(Ops.BIND, name="x"), unbind_bind),
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])
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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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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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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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queue = deque(k for k,v in in_degree.items() if v == 0)
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schedule: list[ScheduleItem] = []
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var_vals: dict[Variable, int] = {}
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while queue:
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k = queue.popleft()
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# unbind var_vals from the kernel
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local_var_vals: list[dict[Variable, int]] = []
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ast = graph_rewrite(k.arg.ast, pm_unbind, ctx=local_var_vals, name="unbind vars")
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var_vals = merge_dicts([var_vals, *local_var_vals])
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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)
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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: queue.append(x)
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return schedule, var_vals
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