//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
	if i > 64 {
		throw("unexpected signal greater than 64")
	}
	*mask |= 1 << (uint(i) - 1)
}

func sigdelset(mask *sigset, i int) {
	if i > 64 {
		throw("unexpected signal greater than 64")
	}
	*mask &^= 1 << (uint(i) - 1)
}

//go:nosplit
func sigfillset(mask *uint64) {
	*mask = ^uint64(0)

// Signal handler for SIGSEGV on a C thread.
static void segvHandler(int signo, siginfo_t* info, void* ctxt) {
	sigset_t mask;
	int i;

	if (sigemptyset(&mask) < 0) {
		die("sigemptyset");
	}
	if (sigaddset(&mask, SIGSEGV) < 0) {
		die("sigaddset");
	}
	i = sigprocmask(SIG_UNBLOCK, &mask, NULL);
	if (i != 0) {
		fprintf(stderr, "sigprocmask: %s\n", strerror(i));
		exit(EXIT_FAILURE);
	}

        def task1 = Stub(Task)
        def task2 = Stub(Task)
        def task3 = Stub(Task)
        def source1 = Stub(FileCollectionInternal)
        def source2 = Stub(FileCollectionInternal)

        given:
        source1.visitDependencies(_) >> { TaskDependencyResolveContext context ->
            context.add(task1)
            context.add(task2)
        }

// significant bit (in hi) and bit 127 is the lowest (lo&1).
type uint128 struct {
	hi uint64
	lo uint64
}

// mask6 returns a uint128 bitmask with the topmost n bits of a
// 128-bit number.
func mask6(n int) uint128 {
	return uint128{^(^uint64(0) >> n), ^uint64(0) << (128 - n)}
}

// isZero reports whether u == 0.
//

	// AVX2GATHER mask/index/dest #UD cases.
	VPGATHERQQ Y2, (BP)(X2*2), Y2   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X2*2), Y7   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X7*2), Y2   // ERROR "mask, index, and destination registers should be distinct"

                    doLast {
                        ${callFromBuild('task1')}
                    }
                }
                task task2 {
                    dependsOn task1
                    doLast {
                        ${callFromBuild('task2')}
                    }
                }
            }
        """

        when:

class CommandLineTaskParserSpec extends Specification {
    def selector = Stub(BuildTaskSelector)
    def defaultBuild = Stub(BuildState)
    def taskConfigurer = Mock(CommandLineTaskConfigurer)
    def task = Mock(Task)
    def task2 = Mock(Task)
    def task3 = Mock(Task)
    def parser = new CommandLineTaskParser(taskConfigurer, selector, defaultBuild)

    def setup() {
        taskConfigurer.configureTasks(_, _) >> { args -> args[1] }
    }

	// features seem to contribute similar slowdowns (~1.4x each).

	mask := maskOf(types)
	for i := 0; i < len(in.events); {
		ev := in.events[i]
		if ev.index > i {
			// push
			if ev.typ&mask != 0 {
				f(ev.node)
			}
			pop := ev.index
			if in.events[pop].typ&mask == 0 {
				// Subtrees do not contain types: skip them and pop.
				i = pop + 1
				continue
			}
		}

						nmsa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(nmrsa))
						ip = make(IP, IPv6len)
						copy(ip, ipsa.Addr[:])
						mask = make(IPMask, IPv6len)
						copy(mask, nmsa.Addr[:])
					}
					ifa := &IPNet{IP: ip, Mask: mask}
					ifat = append(ifat, ifa)
				}
			}
		}
		tab = tab[ifm.Msglen:]
	}

	return ifat, nil
}

	// Array of NCases elements.
	// Each case must be a non-empty interface type.
	Cases [1]*InterfaceType
}

type InterfaceSwitchCache struct {
	Mask    uintptr                      // mask for index. Must be a power of 2 minus 1
	Entries [1]InterfaceSwitchCacheEntry // Mask+1 entries total
}

type InterfaceSwitchCacheEntry struct {
	// type of source value (a *Type)
	Typ uintptr
	// case # to dispatch to
	Case int