var pfxEnabled = false // ISA 3.1 prefixed instructions are supported.
var buildOpCfg = ""    // Save the os/cpu/arch tuple used to configure the assembler in buildop

// padding bytes to add to align code as requested.
func addpad(pc, a int64, ctxt *obj.Link, cursym *obj.LSym) int {
	switch a {
	case 8, 16, 32, 64:
		// By default function alignment is 16. If an alignment > 16 is
		// requested then the function alignment must also be promoted.

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	// and disabling it by default allows stackmapdata to be inlined.
	if stackDebug > 0 && (n < 0 || n >= stkmap.n) {
		throw("stackmapdata: index out of range")
	}
	return bitvector{stkmap.nbit, addb(&stkmap.bytedata[0], uintptr(n*((stkmap.nbit+7)>>3)))}

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)
}

// bitp returns a pointer to the byte containing bit n and a mask for
// selecting that bit from *bytep.
func (b *gcBits) bitp(n uintptr) (bytep *uint8, mask uint8) {