reclaimCredit atomic.Uintptr

	_ cpu.CacheLinePad // prevents false-sharing between arenas and preceding variables

	// arenas is the heap arena map. It points to the metadata for
	// the heap for every arena frame of the entire usable virtual
	// address space.
	//
	// Use arenaIndex to compute indexes into this array.
	//
	// For regions of the address space that are not backed by the
	// Go heap, the arena map contains nil.

func isLeaf(f *Func) bool {
	for _, b := range f.Blocks {
		for _, v := range b.Values {
			if v.Op.IsCall() && !v.Op.IsTailCall() {
				// tail call is not counted as it does not save the return PC or need a frame
				return false
			}
		}
	}
	return true
}

// needRegister reports whether v needs a register.
func (v *Value) needRegister() bool {

	attrNotInSymbolTable Bitmap // "not in symtab" symbols, indexed by global idx
	attrUsedInIface      Bitmap // "used in interface" symbols, indexed by global idx
	attrSpecial          Bitmap // "special" frame symbols, indexed by global idx
	attrVisibilityHidden Bitmap // hidden symbols, indexed by ext sym index
	attrDuplicateOK      Bitmap // dupOK symbols, indexed by ext sym index