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// 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 fpu
import (
"unsafe"
)
// alignedBytes returns a slice of size bytes, aligned in memory to the given
// alignment. This is used because we require certain structures to be aligned
// in a specific way (for example, the X86 floating point data).
func alignedBytes(size, alignment uint) []byte {
data := make([]byte, size+alignment-1)
offset := uint(uintptr(unsafe.Pointer(&data[0])) % uintptr(alignment))
if offset == 0 {
return data[:size:size]
}
return data[alignment-offset:][:size:size]
}
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