// field types.
		if align := typ.align; align > maxAlign {
			maxAlign = align
		}

		// Each field needs its own registers.
		// We sum in uint64 to avoid possible overflows.
		intRegs += uint64(typ.intRegs)
		floatRegs += uint64(typ.floatRegs)
	}

	// Final size includes trailing padding.
	size = RoundUp(size, int64(maxAlign))

	if intRegs > math.MaxUint8 || floatRegs > math.MaxUint8 {

//  c.qcount < c.dataqsiz implies that c.sendq is empty.

import (
	"internal/abi"
	"internal/runtime/atomic"
	"runtime/internal/math"
	"unsafe"
)

const (
	maxAlign  = 8
	hchanSize = unsafe.Sizeof(hchan{}) + uintptr(-int(unsafe.Sizeof(hchan{}))&(maxAlign-1))
	debugChan = false
)

type hchan struct {
	qcount   uint           // total data in the queue
	dataqsiz uint           // size of the circular queue

	// any of them counts as writing to result.
	retRegs []string
	// calculated during initialization
	sizes    types.Sizes
	intSize  int
	ptrSize  int
	maxAlign int
}

// An asmFunc describes the expected variables for a function on a given architecture.
type asmFunc struct {
	arch        *asmArch
	size        int // size of all arguments
	vars        map[string]*asmVar

pkg go/types, type Sizes interface, Offsetsof([]*Var) []int64
pkg go/types, type Sizes interface, Sizeof(Type) int64
pkg go/types, type Slice struct
pkg go/types, type StdSizes struct
pkg go/types, type StdSizes struct, MaxAlign int64
pkg go/types, type StdSizes struct, WordSize int64
pkg go/types, type Struct struct
pkg go/types, type Tuple struct
pkg go/types, type Type interface { String, Underlying }