default:
		throw("bad special kind")
		panic("not reached")
	}
}

// gcBits is an alloc/mark bitmap. This is always used as gcBits.x.
type gcBits struct {
	_ sys.NotInHeap
	x uint8
}

// bytep returns a pointer to the n'th byte of b.
func (b *gcBits) bytep(n uintptr) *uint8 {
	return addb(&b.x, n)
}

	case sym.SGOFUNC:
		if !ctxt.DynlinkingGo() {
			outerSymSize["go:func.*"] = size
		}
	case sym.SGOFUNCRELRO:
		outerSymSize["go:funcrel.*"] = size
	case sym.SGCBITS:
		outerSymSize["runtime.gcbits.*"] = size
	case sym.SPCLNTAB:
		outerSymSize["runtime.pclntab"] = size
	}
}

// addSymbol writes a symbol or an auxiliary symbol entry on ctxt.out.

			for ; c >= npattern; c -= npattern {
				bits |= pattern << nbits
				nbits += npattern
				for nbits >= 8 {
					*dst = uint8(bits)
					dst = add1(dst)
					bits >>= 8
					nbits -= 8
				}
			}

			// Add final fragment to bit buffer.
			if c > 0 {
				pattern &= 1<<c - 1
				bits |= pattern << nbits
				nbits += c
			}
			continue Run
		}

		me = 32 - bits.TrailingZeros32(uint32(mask))
		mbn = bits.LeadingZeros32(^uint32(mask))
		men = 32 - bits.TrailingZeros32(^uint32(mask))
	} else {
		mb = bits.LeadingZeros64(uint64(mask))
		me = 64 - bits.TrailingZeros64(uint64(mask))
		mbn = bits.LeadingZeros64(^uint64(mask))
		men = 64 - bits.TrailingZeros64(^uint64(mask))
	}
	// Check for a wrapping mask (e.g bits at 0 and 63)

// addition/subtraction of arguments represented by Bits values with the
// respective Float addition/subtraction for a variety of precisions
// and rounding modes.
func TestFloatAdd(t *testing.T) {
	for _, xbits := range bitsList {
		for _, ybits := range bitsList {
			// exact values
			x := xbits.Float()
			y := ybits.Float()
			zbits := xbits.add(ybits)
			z := zbits.Float()

// immIFits checks whether the immediate value x fits in nbits bits
// as a signed integer. If it does not, an error is returned.
func immIFits(x int64, nbits uint) error {
	nbits--
	min := int64(-1) << nbits
	max := int64(1)<<nbits - 1
	if x < min || x > max {
		if nbits <= 16 {
			return fmt.Errorf("signed immediate %d must be in range [%d, %d] (%d bits)", x, min, max, nbits)
		}

}

// addDwarfAddrField adds a DWARF field in DWARF 64bits or 32bits.
func (d *dwctxt) addDwarfAddrField(sb *loader.SymbolBuilder, v uint64) {
	if isDwarf64(d.linkctxt) {
		sb.AddUint(d.arch, v)
	} else {
		sb.AddUint32(d.arch, uint32(v))
	}
}

// addDwarfAddrRef adds a DWARF pointer in DWARF 64bits or 32bits.
func (d *dwctxt) addDwarfAddrRef(sb *loader.SymbolBuilder, t loader.Sym) {

		// insert low width bits of arg0 into the result starting at bit lsb, bits to the left of the inserted bit field are set to the high/sign bit of the inserted bit field, bits to the right are zeroed
		{name: "SBFIZ", argLength: 1, reg: gp11, asm: "SBFIZ", aux: "ARM64BitField"},
		// extract width bits of arg0 starting at bit lsb and insert at low end of result, remaining high bits are set to the high/sign bit of the extracted bitfield

		return 0
	}
	// TODO: would it make sense to return an arch-specific
	// alignment depending on section type? E.g. STEXT => 32,
	// SDATA => 1, etc?
	abits := l.align[i]
	if abits == 0 {
		return 0
	}
	return int32(1 << (abits - 1))
}

// SetSymAlign sets the alignment for a symbol.
func (l *Loader) SetSymAlign(i Sym, align int32) {
	// Reject nonsense alignments.

	//   [    1] .text             PROGBITS        00000000 000034 000000 00  AX  0   0  1
	//   [    2] .data             PROGBITS        00000000 000034 000000 00  WA  0   0  1
	//   [    3] .bss              NOBITS          00000000 000034 000000 00  WA  0   0  1
	//   [    4] section_0001      PROGBITS        00000000 000034 000004 00  WA  0   0  4
	//   [    5] section_0002      PROGBITS        00000000 000038 000004 00  WA  0   0  4