ADDQ	$16, DI
	SUBQ	$16, R8
	JMP	loop

diff64:
	ADDQ	$48, SI
	ADDQ	$48, DI
	JMP	diff16
diff48:
	ADDQ	$32, SI
	ADDQ	$32, DI
	JMP	diff16
diff32:
	ADDQ	$16, SI
	ADDQ	$16, DI
	// AX = bit mask of differences
diff16:
	BSFQ	AX, BX	// index of first byte that differs
	XORQ	AX, AX
	MOVB	(SI)(BX*1), CX
	CMPB	CX, (DI)(BX*1)
	SETHI	AX
	LEAQ	-1(AX*2), AX	// convert 1/0 to +1/-1
	RET

    return -Math.nextUp(-d);
  }

  // The mask for the significand, according to the {@link
  // Double#doubleToRawLongBits(double)} spec.
  static final long SIGNIFICAND_MASK = 0x000fffffffffffffL;

  // The mask for the exponent, according to the {@link
  // Double#doubleToRawLongBits(double)} spec.
  static final long EXPONENT_MASK = 0x7ff0000000000000L;

  // The mask for the sign, according to the {@link

		return 1 << nValueSpec
	}
	return 0
}

func maskOf(nodes []ast.Node) uint64 {
	if nodes == nil {
		return math.MaxUint64 // match all node types
	}
	var mask uint64
	for _, n := range nodes {
		mask |= typeOf(n)
	}
	return mask

	if x >= as {
		// The following code simulates an additional check for x == xx and
		// handling the ASCII and invalid cases accordingly. This mask-and-or
		// approach prevents an additional branch.
		mask := rune(x) << 31 >> 31 // Create 0x0000 or 0xFFFF.
		return rune(p[0])&^mask | RuneError&mask, 1
	}
	sz := int(x & 7)
	accept := acceptRanges[x>>4]
	if n < sz {
		return RuneError, 1
	}
	b1 := p[1]

}

func bitSetTest(x int) bool {
	// amd64:"ANDL\t[$]9, AX"
	// amd64:"CMPQ\tAX, [$]9"
	return x&9 == 9
}

// mask contiguous one bits
func cont1Mask64U(x uint64) uint64 {
	// s390x:"RISBGZ\t[$]16, [$]47, [$]0,"
	return x & 0x0000ffffffff0000
}

// mask contiguous zero bits
func cont0Mask64U(x uint64) uint64 {
	// s390x:"RISBGZ\t[$]48, [$]15, [$]0,"
	return x & 0xffff00000000ffff
}

            source[offset]);
      }

      @Override
      public void putLongLittleEndian(byte[] sink, int offset, long value) {
        long mask = 0xFFL;
        for (int i = 0; i < 8; mask <<= 8, i++) {
          sink[offset + i] = (byte) ((value & mask) >> (i * 8));
        }
      }
    }
  }

  static {
    LittleEndianBytes theGetter = JavaLittleEndianBytes.INSTANCE;
    try {
      /*

//
//go:nosplit
func setSignalstackSP(s *stackt, sp uintptr) {
	s.ss_sp = sp
}

//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
	mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
}

func sigdelset(mask *sigset, i int) {
	mask.__bits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
}

//go:nosplit
func (c *sigctxt) fixsigcode(sig uint32) {
}

		sbits = cbits
	}
	if sbits > 7 {
		// Either there was an incomplete symbol, or overlong padding.
		// Both are decoding errors per RFC 7541 section 5.2.
		return ErrInvalidHuffman
	}
	if mask := uint(1<<cbits - 1); cur&mask != mask {
		// Trailing bits must be a prefix of EOS per RFC 7541 section 5.2.
		return ErrInvalidHuffman
	}

	return nil
}

		h2r0 := mul64(h2, r0)
		h0r1 := mul64(h0, r1)
		h1r1 := mul64(h1, r1)
		h2r1 := mul64(h2, r1)

		// Since h2 is known to be at most 7 (5 + 1 + 1), and r0 and r1 have their
		// top 4 bits cleared by rMask{0,1}, we know that their product is not going
		// to overflow 64 bits, so we can ignore the high part of the products.
		//
		// This also means that the product doesn't have a fifth limb (t4).
		if h2r0.hi != 0 {

//	VCHAR          =  %x21-7E
func validHeaderValueByte(c byte) bool {
	// mask is a 128-bit bitmap with 1s for allowed bytes,
	// so that the byte c can be tested with a shift and an and.
	// If c >= 128, then 1<<c and 1<<(c-64) will both be zero.
	// Since this is the obs-text range, we invert the mask to
	// create a bitmap with 1s for disallowed bytes.
	const mask = 0 |
		(1<<(0x7f-0x21)-1)<<0x21 | // VCHAR: %x21-7E
		1<<0x20 | // SP: %x20