wehub-resource-sync
56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""SMEM matrix descriptor helper for tcgen05 / wgmma."""
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from tvm.backend.cuda.operator.tile_primitive.common import smem_desc_add_16B_offset
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from tvm.script import tirx as T
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@T.meta_class
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class SmemDescriptor:
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"""Encoded once via :meth:`init`, reused via :meth:`add_16B_offset`."""
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def __init__(self):
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self._buf = T.alloc_local([1], "uint64")
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@property
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def desc(self):
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return self._buf[0]
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@T.inline
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def init(self, smem_ptr, ldo, sdo, swizzle):
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T.ptx.tcgen05.encode_matrix_descriptor(
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T.address_of(self._buf[0]), smem_ptr, ldo, sdo, swizzle
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)
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def add_16B_offset(self, offset):
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return smem_desc_add_16B_offset(self._buf[0], offset)
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def make_lo_uniform(self):
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"""Broadcast the lower 32 bits to all warp lanes via ``__shfl_sync``."""
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func_name = "smem_desc_make_lo_uniform"
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source_code = f"""
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__forceinline__ __device__ void {func_name}(uint64_t* desc) {{
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SmemDescriptor* d = reinterpret_cast<SmemDescriptor*>(desc);
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d->lo = __shfl_sync(0xffffffff, d->lo, 0);
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}}
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"""
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return T.cuda.func_call(
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func_name, T.address_of(self._buf[0]), source_code=source_code, return_type="void"
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)
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