IP_IPSEC_REMOTE_AUTH              = 0x1c
	IP_IPSEC_REMOTE_CRED              = 0x1a
	IP_IPSEC_REMOTE_ID                = 0x18
	IP_MAXPACKET                      = 0xffff
	IP_MAX_MEMBERSHIPS                = 0xfff
	IP_MF                             = 0x2000
	IP_MINTTL                         = 0x20
	IP_MIN_MEMBERSHIPS                = 0xf
	IP_MSS                            = 0x240

	IN_ACCESS                        = 0x1
	IN_ALL_EVENTS                    = 0xfff
	IN_ATTRIB                        = 0x4
	IN_CLASSA_HOST                   = 0xffffff
	IN_CLASSA_MAX                    = 0x80
	IN_CLASSA_NET                    = 0xff000000
	IN_CLASSA_NSHIFT                 = 0x18
	IN_CLASSB_HOST                   = 0xffff
	IN_CLASSB_MAX                    = 0x10000
	IN_CLASSB_NET                    = 0xffff0000

(RISBGZ x {r}) && r == s390x.NewRotateParams(48, 63, 0) => (MOVHZreg x)
(RISBGZ x {r}) && r == s390x.NewRotateParams(32, 63, 0) => (MOVWZreg x)

// Use sign/zero extend instead of ANDW.
(ANDWconst [0x00ff] x) => (MOVBZreg x)
(ANDWconst [0xffff] x) => (MOVHZreg x)

// Strength reduce multiplication to the sum (or difference) of two powers of two.
//
// Examples:
//     5x -> 4x + 1x
//    10x -> 8x + 2x
//   120x -> 128x - 8x

		return y, x
	}
	return 0, 0
}

func immaddr(v int32) int32 {
	if v >= 0 && v <= 0xfff {
		return v&0xfff | 1<<24 | 1<<23 /* pre indexing */ /* pre indexing, up */
	}
	if v >= -0xfff && v < 0 {
		return -v&0xfff | 1<<24 /* pre indexing */
	}
	return 0
}

func immfloat(v int32) bool {

	ANDS	$0xffff, R2                         // ANDS	$65535, R2                      // 423c40f2
	AND	$0x7fffffff, R3                     // AND	$2147483647, R3                 // 63784092
	ANDS	$0x0ffffffff80000000, R2            // ANDS	$-2147483648, R2                // 428061f2
	AND	$0xfffff, R2                        // AND	$1048575, R2                    // 424c4092