From 376e8904320cff0b9594dc0388f51daded756cc4 Mon Sep 17 00:00:00 2001 From: Andrei Vagin Date: Mon, 26 Jul 2021 15:41:11 -0700 Subject: Reduce overhead of AlignedAtomic types AlignedAtomicUint64 is 15 bytes and it takes 16 bytes in structures. On 32-bit systems, variables and structure fields is guaranteed to be 32-bit aligned and this means that we need only 12 bytes to find 8 contiguous bytes. --- pkg/atomicbitops/aligned_test.go | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 pkg/atomicbitops/aligned_test.go (limited to 'pkg/atomicbitops/aligned_test.go') diff --git a/pkg/atomicbitops/aligned_test.go b/pkg/atomicbitops/aligned_test.go new file mode 100644 index 000000000..e7123d2b8 --- /dev/null +++ b/pkg/atomicbitops/aligned_test.go @@ -0,0 +1,35 @@ +// Copyright 2021 The gVisor Authors. +// +// 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 +// +// http://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. + +package atomicbitops + +import ( + "testing" +) + +func TestAtomiciInt64(t *testing.T) { + v := struct { + v8 int8 + v64 AlignedAtomicInt64 + }{} + v.v64.Add(1) +} + +func TestAtomicUint64(t *testing.T) { + v := struct { + v8 uint8 + v64 AlignedAtomicUint64 + }{} + v.v64.Add(1) +} -- cgit v1.2.3