func (c *sigctxt) sigcode() uint64 { return uint64(c.info._code) }
func (c *sigctxt) sigaddr() uint64 {
	return *(*uint64)(unsafe.Pointer(&c.info._reason[0]))
}

func (c *sigctxt) set_rip(x uint64)     { c.regs().__gregs[_REG_RIP] = x }
func (c *sigctxt) set_rsp(x uint64)     { c.regs().__gregs[_REG_RSP] = x }
func (c *sigctxt) set_sigcode(x uint64) { c.info._code = int32(x) }
func (c *sigctxt) set_sigaddr(x uint64) {

func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 { return *(*uint64)(unsafe.Pointer(&c.info.__data[0])) }

func (c *sigctxt) set_rip(x uint64)     { c.regs().gregs[_REG_RIP] = int64(x) }
func (c *sigctxt) set_rsp(x uint64)     { c.regs().gregs[_REG_RSP] = int64(x) }
func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }

			for i, a := range v.Args {
				if !a.Type.IsFlags() {
					continue
				}
				if a == flag {
					continue
				}
				// Recalculate a
				c := copyFlags(a, b)
				// Update v.
				v.SetArg(i, c)
				// Remember the most-recently computed flag value.
				flag = a
			}
			// Issue v.
			b.Values = append(b.Values, v)
			if v.clobbersFlags() {
				flag = nil
			}
			if v.Type.IsFlags() {

	for _, b := range f.Blocks {
		for _, v := range b.Values {
			for i, a := range v.Args {
				if opcodeTable[a.Op].argLen == 0 {
					key := vkey{a.Op, keyFor(a), a.Aux, a.Type}
					if rv, ok := vals[key]; ok {
						v.SetArg(i, rv)
					}
				}
			}
		}
	}
}

// vkey is a type used to uniquely identify a zero arg value.
type vkey struct {
	op Op
	ai int64       // aux int
	ax Aux         // aux

	tv.tv_usec = int64(x)
}

type sigactiont struct {
	sa_flags   uint32
	sa_handler uintptr
	sa_mask    [2]uint64
	// linux header does not have sa_restorer field,
	// but it is used in setsig(). it is no harm to put it here
	sa_restorer uintptr
}

type siginfoFields struct {
	si_signo int32
	si_code  int32
	si_errno int32
	__pad0   [1]int32

	tv.tv_usec = x
}

type sigactiont struct {
	sa_flags   uint32
	sa_handler uintptr
	sa_mask    [4]uint32
	// linux header does not have sa_restorer field,
	// but it is used in setsig(). it is no harm to put it here
	sa_restorer uintptr
}

type siginfoFields struct {
	si_signo int32
	si_code  int32
	si_errno int32
	// below here is a union; si_addr is the only field we use

	tv.tv_usec = int64(x)
}

type sigactiont struct {
	sa_handler uintptr
	sa_flags   uint64
	sa_mask    uint64
	// Linux on riscv64 does not have the sa_restorer field, but the setsig
	// function references it (for x86). Not much harm to include it at the end.
	sa_restorer uintptr
}

type siginfoFields struct {
	si_signo int32
	si_errno int32
	si_code  int32

	_O_NONBLOCK = 0x800
	_O_CLOEXEC  = 0x80000
)

type sigactiont struct {
	sa_handler uintptr
	sa_flags   uint64
	sa_mask    uint64
	// Linux on loong64 does not have the sa_restorer field, but the setsig
	// function references it (for x86). Not much harm to include it at the end.
	sa_restorer uintptr
}

type siginfoFields struct {
	si_signo int32
	si_errno int32
	si_code  int32
	__pad0   [1]int32

func (c *sigctxt) gs() uint64      { return c.regs().gs }
func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }

func (c *sigctxt) set_rip(x uint64)     { c.regs().rip = x }
func (c *sigctxt) set_rsp(x uint64)     { c.regs().rsp = x }
func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }
func (c *sigctxt) set_sigaddr(x uint64) { c.info.si_addr = x }

		}
		// If the original block contained u = φ(u0, u1, ..., un) and
		// the current phi is
		//    v = φ(v0, v1, ..., u, ..., vk)
		// then the merged phi is
		//    v = φ(v0, v1, ..., u0, ..., vk, u1, ..., un)
		v.SetArg(i, u.Args[0])
		v.AddArgs(u.Args[1:]...)
	} else {
		// If the original block contained u = φ(u0, u1, ..., un) and
		// the current phi is
		//    v = φ(v0, v1, ...,  vi, ..., vk)