// so the caller must pretend that sa[-1] == len(text), as noted above.
	// The second difference is that the first leftmost LMS-substring start index
	// does not end an earlier LMS-substring, so as an optimization we can omit
	// that leftmost LMS-substring start index (the last one we wrote).
	//
	// Exception: if numLMS <= 1, the caller is not going to bother with

		{name: "LoweredAtomicExchange64", argLength: 3, reg: exchange, asm: "CSG", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"},

		// find leftmost one
		{
			name:         "FLOGR",
			argLength:    1,
			reg:          regInfo{inputs: gponly, outputs: []regMask{buildReg("R0")}, clobbers: buildReg("R1")},
			asm:          "FLOGR",
			typ:          "UInt64",

(MULLD x (MOVDconst [c])) && is32Bit(c) => (MULLDconst [int32(c)] x)
(MULLW x (MOVDconst [c])) => (MULLWconst [int32(c)] x)

// NILF instructions leave the high 32 bits unchanged which is
// equivalent to the leftmost 32 bits being set.
// TODO(mundaym): modify the assembler to accept 64-bit values
// and use isU32Bit(^c).
(AND x (MOVDconst [c]))
  && s390x.NewRotateParams(0, 63, 0).OutMerge(uint64(c)) != nil

  /**
   * If a hostname is not a key in the EXCLUDE map, and if removing its leftmost component results
   * in a name which is a key in this map, it is a public suffix.
   */
  public static final ImmutableMap<String, PublicSuffixType> UNDER =
      TrieParser.parseTrie(

  /**
   * If a hostname is not a key in the EXCLUDE map, and if removing its leftmost component results
   * in a name which is a key in this map, it is a public suffix.
   */
  public static final ImmutableMap<String, PublicSuffixType> UNDER =
      TrieParser.parseTrie(

	case RecvDir:
		s = "<-chan " + stringFor(typ)
	case BothDir:
		typeStr := stringFor(typ)
		if typeStr[0] == '<' {
			// typ is recv chan, need parentheses as "<-" associates with leftmost
			// chan possible, see:
			// * https://golang.org/ref/spec#Channel_types
			// * https://github.com/golang/go/issues/39897
			s = "chan (" + typeStr + ")"
		} else {
			s = "chan " + typeStr
		}

	return predicate{
		func(r rune) bool {
			return !p.f(r)
		},
		"not " + p.name,
	}
}

var trimFuncTests = []struct {
	f        predicate
	in       string
	trimOut  string
	leftOut  string
	rightOut string
}{
	{isSpace, space + " hello " + space,
		"hello",
		"hello " + space,
		space + " hello"},
	{isDigit, "\u0e50\u0e5212hello34\u0e50\u0e51",
		"hello",

	func(r rune) bool {
		return r != utf8.RuneError
	},
	"IsValidRune",
}

type TrimFuncTest struct {
	f        predicate
	in       string
	trimOut  []byte
	leftOut  []byte
	rightOut []byte
}

func not(p predicate) predicate {
	return predicate{
		func(r rune) bool {
			return !p.f(r)
		},
		"not " + p.name,
	}
}