1// Copyright 2009 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Malloc small size classes.
6//
7// See malloc.go for overview.
8// See also mksizeclasses.go for how we decide what size classes to use.
9
10package runtime
11
12// Returns size of the memory block that mallocgc will allocate if you ask for the size.
13func roundupsize(size uintptr) uintptr {
14	if size < _MaxSmallSize {
15		if size <= smallSizeMax-8 {
16			return uintptr(class_to_size[size_to_class8[(size+smallSizeDiv-1)/smallSizeDiv]])
17		} else {
18			return uintptr(class_to_size[size_to_class128[(size-smallSizeMax+largeSizeDiv-1)/largeSizeDiv]])
19		}
20	}
21	if size+_PageSize < size {
22		return size
23	}
24	return round(size, _PageSize)
25}
26