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# Copyright (C) 2020 Arm Limited or its affiliates. All rights reserved.
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the License); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an AS IS BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Description:
# Allocate tensor addresses using a greedy algorithm.
from . import numeric_util
class GreedyAllocator:
def __init__(self, nng, arch, live_ranges, mem_area):
self.nng = nng
self.arch = arch
self.mem_area = mem_area
self.live_ranges = live_ranges
self.memory_required = 0
self.current_allocs = []
def alloc(self, new_lr):
size = new_lr.size
current_top = 0
if self.current_allocs:
current_top = max(start_addr + lr.size for start_addr, lr in self.current_allocs)
best_offset = numeric_util.round_up(current_top, new_lr.get_alignment())
best_offset_fit = (1 << 64) - 1
aligned_size = numeric_util.round_up(size, new_lr.get_alignment())
current_offset = 0
for start_addr, lr in self.current_allocs:
aligned_current_offset = numeric_util.round_up(current_offset, new_lr.get_alignment())
if (
aligned_current_offset + aligned_size <= start_addr
and start_addr - aligned_current_offset < best_offset_fit
):
best_offset = aligned_current_offset
best_offset_fit = start_addr - aligned_current_offset
current_offset = start_addr + lr.size
best_offset = new_lr.set_address(best_offset)
self.memory_required = max(self.memory_required, best_offset + aligned_size)
self.current_allocs.append((best_offset, new_lr))
self.current_allocs = list(sorted(self.current_allocs))
def dealloc(self, lr_to_dealloc):
self.current_allocs = [(start_addr, lr) for start_addr, lr in self.current_allocs if lr != lr_to_dealloc]
def allocate_live_ranges(self, alignment):
lrs = set()
for lr in self.live_ranges.lrs:
lrs.add((lr.start_time, -lr.end_time, lr))
lrs = sorted(lrs)
for curr_time, _, new_lr in lrs:
for _, lr in list(self.current_allocs):
if lr.end_time < curr_time:
self.dealloc(lr)
self.alloc(new_lr)
return self.memory_required
def allocate_live_ranges(nng, arch, live_ranges, mem_area, alignment):
g = GreedyAllocator(nng, arch, live_ranges, mem_area)
return g.allocate_live_ranges(alignment)
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