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# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# pylint: disable=missing-docstring
"""Utility methods for generic GPU."""
from typing import List, Optional
from tvm import tir
from tvm.target import Target
def max_threads_per_block(target: Target) -> int:
"""Get the maximum number of threads per block for a given target.
Parameters
----------
target : Target
The target to get the maximum number of threads per block for.
Returns
-------
max_threads_per_block : int
The maximum number of threads per block for the given target.
"""
for name in ["max_threads_per_block", "max_num_threads"]:
result = target.attrs.get(name, None)
if result is not None:
return result
if target.kind.name == "cuda":
return 1024
return 256
def suggest_threads_per_block(
target: Target,
loops: List[tir.For],
max_threads_for_dynamic_loop: int = 32,
) -> List[int]:
if target.kind.name == "cuda":
threads = 1024
elif target.kind.name == "rocm":
threads = 256
elif target.kind.name == "metal":
threads = 256
else:
threads = 64
results: List[Optional[int]] = []
dynamic: List[int] = []
for i, loop in enumerate(loops):
loop_extent = loop.extent
if isinstance(loop_extent, tir.IntImm):
loop_extent = loop_extent.value
extent = 1
while extent <= loop_extent and extent <= threads:
extent *= 2
extent //= 2
assert extent >= 1
assert threads % extent == 0
threads //= extent
results.append(extent)
else:
results.append(None)
dynamic.append(i)
for i in dynamic:
extent = 1
while extent <= max_threads_for_dynamic_loop and extent <= threads:
extent *= 2
extent //= 2
assert extent >= 1
assert threads % extent == 0
threads //= extent
results[i] = extent
if dynamic:
results[dynamic[0]] *= threads
return results
def get_sm_version(target: Target) -> int:
if target.kind.name != "cuda":
return -1
arch = target.arch
sm_version = arch.replace("sm_", "")
return int(sm_version) if sm_version.isdigit() else -1
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