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#################################################################################################
#
# Copyright (c) 2023 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: BSD-3-Clause
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#################################################################################################
"""
Methods for layout swizzling
"""
from .layout import *
def shiftr(a, s):
return a >> s if s > 0 else shiftl(a, -s)
def shiftl(a, s):
return a << s if s > 0 else shiftr(a, -s)
## A generic Swizzle functor
# 0bxxxxxxxxxxxxxxxYYYxxxxxxxZZZxxxx
# ^--^ Base is the number of least-sig bits to keep constant
# ^-^ ^-^ Bits is the number of bits in the mask
# ^---------^ Shift is the distance to shift the YYY mask
# (pos shifts YYY to the right, neg shifts YYY to the left)
#
# e.g. Given
# 0bxxxxxxxxxxxxxxxxYYxxxxxxxxxZZxxx
# the result is
# 0bxxxxxxxxxxxxxxxxYYxxxxxxxxxAAxxx where AA = ZZ xor YY
#
class Swizzle:
def __init__(self, bits, base, shift):
assert bits >= 0
assert base >= 0
assert abs(shift) >= bits
self.bits = bits
self.base = base
self.shift = shift
bit_msk = (1 << bits) - 1
self.yyy_msk = bit_msk << (base + max(0,shift))
self.zzz_msk = bit_msk << (base - min(0,shift))
# operator () (transform integer)
def __call__(self, offset):
return offset ^ shiftr(offset & self.yyy_msk, self.shift)
# Size of the domain
def size(self):
return 1 << (bits + base + abs(shift))
# Size of the codomain
def cosize(self):
return self.size()
# print and str
def __str__(self):
return f"SW_{self.bits}_{self.base}_{self.shift}"
# error msgs and representation
def __repr__(self):
return f"Swizzle({self.bits},{self.base},{self.shift})"
class ComposedLayout(LayoutBase):
def __init__(self, layoutB, offset, layoutA):
self.layoutB = layoutB
self.offset = offset
self.layoutA = layoutA
# operator ==
def __eq__(self, other):
return self.layoutB == other.layoutB and self.offset == other.offset and self.layoutA == other.layoutA
# operator len(L) (len [rank] like tuples)
def __len__(self):
return len(self.layoutA)
# operator () (map coord to idx)
def __call__(self, *args):
return self.layoutB(self.offset + self.layoutA(*args))
# operator [] (get-i like tuples)
def __getitem__(self, i):
return ComposedLayout(self.layoutB, self.offset, self.layoutA[i])
# size(layout) Size of the domain
def size(self):
return size(self.layoutA)
# cosize(layout) Size of the codomain
def cosize(self):
return cosize(self.layoutB)
# print and str
def __str__(self):
return f"{self.layoutB} o {self.offset} o {self.layoutA}"
# error msgs and representation
def __repr__(self):
return f"ComposedLayout({repr(self.layoutB)},{repr(self.offset)},{repr(self.layoutA)})"
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