}

// pages64 returns a 64-bit bitmap representing a block of 64 pages aligned
// to 64 pages. The returned block of pages is the one containing the i'th
// page in this pallocBits. Each bit represents whether the page is in-use.
func (b *pallocBits) pages64(i uint) uint64 {
	return (*pageBits)(b).block64(i)
}

// allocPages64 allocates a 64-bit block of 64 pages aligned to 64 pages according

// directio.AlignSize is defined as 0 in MacOS causing divide by 0 error.
const DirectioAlignSize = 4096

// CopyAligned - copies from reader to writer using the aligned input
// buffer, it is expected that input buffer is page aligned to
// 4K page boundaries. Without passing aligned buffer may cause
// this function to return error.
//
// This code is similar in spirit to io.Copy but it is only to be

	m.mutex.Lock()
	defer m.mutex.Unlock()
	for resource, requested := range accumulatedResourceRequests {
		// Only consider devices that actually contain topology information.
		if aligned := m.deviceHasTopologyAlignment(resource); !aligned {
			klog.InfoS("Resource does not have a topology preference", "resource", resource)
			deviceHints[resource] = nil
			continue
		}

	// nothing else allocates from it.
	runtime.Acquirem()

	// Make 1-byte allocations until we get a fresh tiny slot.
	aligned := false
	for i := 0; i < 16; i++ {
		x := runtime.Escape(new(byte))
		if uintptr(unsafe.Pointer(x))&0xf == 0xf {
			aligned = true
			break
		}
	}
	if !aligned {
		runtime.Releasem()
		t.Fatal("unable to get a fresh tiny slot")
	}

	// Create a 4-byte object so that the current

	// A hint is considered socket aligned if sockets across which numa nodes span is equal to minSockets
	minSockets := (minAffinitySize + numaNodesPerSocket - 1) / numaNodesPerSocket
	return p.topology.CPUDetails.SocketsInNUMANodes(numaNodesBitMask...).Size() == minSockets
}

// getAlignedCPUs return set of aligned CPUs based on numa affinity mask and configured policy options.

		if err != nil {
			return nil, err
		}
		if allocateRemainingFrom(preferred.Intersection(aligned)) {
			return allocated, nil
		}
		// Then fallback to allocate from the aligned set if no preferred list
		// is returned (or not enough devices are returned in that list).
		if allocateRemainingFrom(aligned) {
			return allocated, nil
		}

Starting with Go 1.12, Go asm supports the PCALIGN directive, which indicates
that the next instruction should be aligned to the specified value. Currently
8 and 16 are the only supported values, and a maximum of 2 NOPs will be added
to align the code. That means in the case where the code is aligned to 4 but
PCALIGN $16 is at that location, the code will only be aligned to 8 to avoid
adding 3 NOPs.

// two's-complement way.
//
//go:nosplit
func (i *Int32) Add(delta int32) int32 {
	return Xaddint32(&i.value, delta)
}

// Int64 is an atomically accessed int64 value.
//
// 8-byte aligned on all platforms, unlike a regular int64.
//
// An Int64 must not be copied.
type Int64 struct {
	noCopy noCopy
	_      align64
	value  int64
}

// Load accesses and returns the value atomically.
//

	return pinState{bytep, byteVal, mask}
}

func (s *mspan) pinnerBitSize() uintptr {
	return divRoundUp(uintptr(s.nelems)*2, 8)
}

// newPinnerBits returns a pointer to 8 byte aligned bytes to be used for this
// span's pinner bits. newPinnerBits is used to mark objects that are pinned.
// They are copied when the span is swept.
func (s *mspan) newPinnerBits() *pinnerBits {

		// passed as two words (little endian); and
		// structs are pushed on the stack. In
		// fastcall, arguments larger than the word
		// size are passed by reference. On arm,
		// 8-byte aligned arguments round up to the
		// next even register and can be split across
		// registers and the stack.
		panic("compileCallback: argument size is larger than uintptr")
	}