ss_flags  int32
	pad_cgo_0 [4]byte
	ss_size   uintptr
}

type sigcontext struct {
	_unused     [4]uint64
	signal      int32
	_pad0       int32
	handler     uint64
	oldmask     uint64
	regs        *ptregs
	gp_regs     [48]uint64
	fp_regs     [33]float64
	v_regs      *vreg
	vmx_reserve [101]int64
}

type ucontext struct {
	uc_flags    uint64
	uc_link     *ucontext
	uc_stack    stackt

	}
	return ""
}

func nrtest(t *testing.T, ft *types.Type, expected int) {
	types.CalcSize(ft)
	got := configAMD64.NumParamRegs(ft)
	if got != expected {
		t.Errorf("]\nexpected num regs = %d, got %d, type %v", expected, got, ft)
	}
}

func abitest(t *testing.T, ft *types.Type, exp expectedDump) {

	types.CalcSize(ft)

	// Analyze with full set of registers.

zero512setup:  // setup for dcbz loop
	CMP  R4, $512   // check if at least 512
	BLT  remain
	SRD  $9, R4, R8 // loop count for 512 chunks
	MOVD R8, CTR    // set up counter
	MOVD $128, R9   // index regs for 128 bytes
	MOVD $256, R10
	MOVD $384, R11
	PCALIGN $16
zero512:
	DCBZ (R3+R0)        // clear first chunk
	DCBZ (R3+R9)        // clear second chunk
	DCBZ (R3+R10)       // clear third chunk

			// with the flag users. This breaks the SSA representation.
			// We could fix up the users with another pass, but for now
			// we'll just leave it. (Regalloc has the same issue for
			// standard regs, and it runs next.)
			// For this reason, take care not to add this flag
			// generator to the remove list.
		}
	}

	// Save live flag state for later.
	for _, b := range f.Blocks {

	}
	memAddr := func(base, index int16) *obj.Addr {
		return &obj.Addr{Type: obj.TYPE_MEM, Reg: base, Index: index}
	}

	// TODO(quasilyte): oclass doesn't return Yxxx for X/Y regs with
	// ID higher than 7. We don't encode such instructions, but this
	// behavior seems inconsistent. It should probably either
	// never check for arch or do it in all cases.

	oclassTestsCommon := []*oclassTest{