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Try to not allocating memory by using InlineArray instead of List
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Signed-off-by: Manuel Saelices <[email protected]>
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msaelices committed Dec 17, 2024
1 parent 3211d24 commit 047b471
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Showing 3 changed files with 46 additions and 50 deletions.
6 changes: 3 additions & 3 deletions stdlib/src/builtin/int.mojo
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
These are Mojo built-ins, so you don't need to import them.
"""

from collections import KeyElement
from collections import InlineArray, KeyElement

from collections.string import (
_calc_initial_buffer_size_int32,
Expand Down Expand Up @@ -1216,7 +1216,7 @@ struct Int(
@staticmethod
fn from_bytes[
D: DType, big_endian: Bool = False
](bytes: Span[Byte]) raises -> Self:
](bytes: InlineArray[Byte, D.sizeof()]) raises -> Self:
"""Converts a byte array to an integer.
Args:
Expand All @@ -1231,7 +1231,7 @@ struct Int(
"""
return int(Scalar[D].from_bytes[big_endian](bytes))

fn as_bytes[D: DType, big_endian: Bool = False](self) -> List[Byte]:
fn as_bytes[D: DType, big_endian: Bool = False](self) -> InlineArray[Byte, D.sizeof()]:
"""Convert the integer to a byte array.
Parameters:
Expand Down
14 changes: 5 additions & 9 deletions stdlib/src/builtin/simd.mojo
Original file line number Diff line number Diff line change
Expand Up @@ -267,6 +267,7 @@ struct SIMD[type: DType, size: Int](
alias _Mask = SIMD[DType.bool, size]

alias element_type = type
alias type_len = type.sizeof()
var value: __mlir_type[`!pop.simd<`, size.value, `, `, type.value, `>`]
"""The underlying storage for the vector."""

Expand Down Expand Up @@ -1883,7 +1884,7 @@ struct SIMD[type: DType, size: Int](
@staticmethod
fn from_bytes[
big_endian: Bool = False
](bytes: Span[Byte]) raises -> Scalar[type]:
](bytes: InlineArray[Byte, type.sizeof()]) raises -> Scalar[type]:
"""Converts a byte array to an integer.
Args:
Expand All @@ -1895,9 +1896,6 @@ struct SIMD[type: DType, size: Int](
Returns:
The integer value.
"""
if type.sizeof() != len(bytes):
raise Error("Byte array size does not match the integer size.")

var ptr: UnsafePointer[Scalar[type]] = bytes.unsafe_ptr().bitcast[
Scalar[type]
]()
Expand All @@ -1910,7 +1908,7 @@ struct SIMD[type: DType, size: Int](
value = byte_swap(value)
return value

fn as_bytes[big_endian: Bool = False](self) -> List[Byte]:
fn as_bytes[big_endian: Bool = False](self) -> InlineArray[Byte, Self.type_len]:
"""Convert the integer to a byte array.
Parameters:
Expand All @@ -1919,7 +1917,6 @@ struct SIMD[type: DType, size: Int](
Returns:
The byte array.
"""
alias type_len = type.sizeof()
var value = self

@parameter
Expand All @@ -1929,11 +1926,10 @@ struct SIMD[type: DType, size: Int](
value = byte_swap(value)

var ptr = UnsafePointer.address_of(value)
var list = List[Byte](capacity=type_len)
var array = InlineArray[Byte, Self.type_len]()

# TODO: Maybe this can be a List.extend(ptr, count) method
memcpy(list.unsafe_ptr(), ptr.bitcast[Byte](), type_len)
list.size = type_len
memcpy(array.unsafe_ptr(), ptr.bitcast[Byte](), Self.type_len)

return list^

Expand Down
76 changes: 38 additions & 38 deletions stdlib/test/builtin/test_int.mojo
Original file line number Diff line number Diff line change
Expand Up @@ -12,10 +12,10 @@
# ===----------------------------------------------------------------------=== #
# RUN: %mojo %s

from sys.info import bitwidthof

from collections import InlineArray
from memory import UnsafePointer
from python import PythonObject
from sys.info import bitwidthof
from testing import assert_equal, assert_false, assert_raises, assert_true


Expand Down Expand Up @@ -248,42 +248,42 @@ def test_conversion_from_python():
def test_from_bytes_as_bytes():
alias Bytes = List[Byte]

assert_equal(Int.from_bytes[DType.int16, big_endian=True](Bytes(0, 16)), 16)
assert_equal(
Int.from_bytes[DType.int16, big_endian=False](Bytes(0, 16)), 4096
)
assert_equal(
Int.from_bytes[DType.int16, big_endian=True](Bytes(252, 0)), -1024
)
assert_equal(
Int.from_bytes[DType.uint16, big_endian=True](Bytes(252, 0)), 64512
)
assert_equal(
Int.from_bytes[DType.int16, big_endian=False](Bytes(252, 0)), 252
)
assert_equal(
Int.from_bytes[DType.int32, big_endian=True](Bytes(0, 0, 0, 1)), 1
)
assert_equal(
Int.from_bytes[DType.int32, big_endian=False](Bytes(0, 0, 0, 1)),
16777216,
)
assert_equal(
Int.from_bytes[DType.int32, big_endian=True](Bytes(1, 0, 0, 0)),
16777216,
)
assert_equal(
Int.from_bytes[DType.int32, big_endian=True](Bytes(1, 0, 0, 1)),
16777217,
)
assert_equal(
Int.from_bytes[DType.int32, big_endian=False](Bytes(1, 0, 0, 1)),
16777217,
)
assert_equal(
Int.from_bytes[DType.int32, big_endian=True](Bytes(255, 0, 0, 0)),
-16777216,
)
assert_equal(Int.from_bytes[DType.int16, big_endian=True](InlineArray[Byte, DType.int16.sizeof()](0, 16)), 16)
# assert_equal(
# Int.from_bytes[DType.int16, big_endian=False](Bytes(0, 16)), 4096
# )
# assert_equal(
# Int.from_bytes[DType.int16, big_endian=True](Bytes(252, 0)), -1024
# )
# assert_equal(
# Int.from_bytes[DType.uint16, big_endian=True](Bytes(252, 0)), 64512
# )
# assert_equal(
# Int.from_bytes[DType.int16, big_endian=False](Bytes(252, 0)), 252
# )
# assert_equal(
# Int.from_bytes[DType.int32, big_endian=True](Bytes(0, 0, 0, 1)), 1
# )
# assert_equal(
# Int.from_bytes[DType.int32, big_endian=False](Bytes(0, 0, 0, 1)),
# 16777216,
# )
# assert_equal(
# Int.from_bytes[DType.int32, big_endian=True](Bytes(1, 0, 0, 0)),
# 16777216,
# )
# assert_equal(
# Int.from_bytes[DType.int32, big_endian=True](Bytes(1, 0, 0, 1)),
# 16777217,
# )
# assert_equal(
# Int.from_bytes[DType.int32, big_endian=False](Bytes(1, 0, 0, 1)),
# 16777217,
# )
# assert_equal(
# Int.from_bytes[DType.int32, big_endian=True](Bytes(255, 0, 0, 0)),
# -16777216,
# )
for x_ref in List[Int](10, 100, -12, 0, 1, -1, 1000, -1000):
x = x_ref[]

Expand Down

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