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.
5 // Malloc small size classes.
7 // See malloc.go for overview.
8 // See also mksizeclasses.go for how we decide what size classes to use.
12 // Returns size of the memory block that mallocgc will allocate if you ask for the size.
13 func roundupsize(size uintptr) uintptr {
14 if size < _MaxSmallSize {
15 if size <= smallSizeMax-8 {
16 return uintptr(class_to_size[size_to_class8[divRoundUp(size, smallSizeDiv)]])
18 return uintptr(class_to_size[size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]])
21 if size+_PageSize < size {
24 return alignUp(size, _PageSize)