// Element has GC program; emit one element.
		n := uintptr(*(*uint32)(unsafe.Pointer(typ.GCData)))
		prog := typ.GcSlice(4, 4+n-1)
		return append(dst, prog...)
	}

	// Element is small with pointer mask; use as literal bits.
	ptrs := typ.PtrBytes / goarch.PtrSize
	mask := typ.GcSlice(0, (ptrs+7)/8)

	// Emit 120-bit chunks of full bytes (max is 127 but we avoid using partial bytes).