BC $20,CR0LT,CTR                // 4e800420
	BC $20,CR0GT,CTR                // 4e810420
	BC 20,CR0LT,CTR                 // BC $20,CR0LT,CTR // 4e800420
	BC 20,undefined_symbol,CTR      // BC $20,CR0LT,CTR // 4e800420
	BC 20,undefined_symbol+1,CTR    // BC $20,CR0GT,CTR // 4e810420
	JMP CTR                         // 4e800420
	BR CTR                          // JMP CTR // 4e800420

}

// supportedCiphers lists ciphers we support but might not recommend.
// https://cs.opensource.google/go/x/crypto/+/refs/tags/v0.22.0:ssh/common.go;l=28
var supportedCiphers = []string{
	"aes128-ctr", "aes192-ctr", "aes256-ctr",
	"******@****.***", gcm256CipherID,
	chacha20Poly1305ID,
	"arcfour256", "arcfour128", "arcfour",
	aes128cbcID,
	tripledescbcID,
}

diffie-hellman-group1-sha1
```

`--sftp=cipher-algos=...` specifies the allowed cipher algorithms. 
If unspecified then a sensible default is used.

Valid values: 
```
aes128-ctr
aes192-ctr
aes256-ctr
******@****.***
******@****.***
******@****.***
arcfour256
arcfour128
arcfour
aes128-cbc
3des-cbc
```

	{"(-288-3*8)(R1)", "-312(R1)"},
	{"(16)(R7)", "16(R7)"},
	{"(8)(g)", "8(g)"},
	{"(CTR)", "(CTR)"},
	{"(R0)", "(R0)"},
	{"(R3)", "(R3)"},
	{"(R4)", "(R4)"},
	{"(R5)", "(R5)"},
	{"(R5)(R6*1)", "(R5)(R6*1)"},
	{"(R5+R6)", "(R5)(R6)"},
	{"-1(R4)", "-1(R4)"},
	{"-1(R5)", "-1(R5)"},
	{"6(PC)", "6(PC)"},
	{"CR7", "CR7"},
	{"CTR", "CTR"},
	{"VS0", "VS0"},
	{"VS1", "VS1"},
	{"VS2", "VS2"},
	{"VS3", "VS3"},

		} else {
			p.branch(targetAddr, targetProg)
		}
	case target.Type == obj.TYPE_MEM && target.Name == obj.NAME_NONE:
		// JMP 4(R0)
		*targetAddr = *target
		// On the ppc64, 9a encodes BR (CTR) as BR CTR. We do the same.
		if p.arch.Family == sys.PPC64 && target.Offset == 0 {
			targetAddr.Type = obj.TYPE_REG
		}
	case target.Type == obj.TYPE_CONST:
		// JMP $4
		*targetAddr = a[0]

	}
	for i := ppc64.REG_CR0LT; i <= ppc64.REG_CR7SO; i++ {
		register[obj.Rconv(i)] = int16(i)
	}
	register["CR"] = ppc64.REG_CR
	register["XER"] = ppc64.REG_XER
	register["LR"] = ppc64.REG_LR
	register["CTR"] = ppc64.REG_CTR
	register["FPSCR"] = ppc64.REG_FPSCR
	register["MSR"] = ppc64.REG_MSR
	// Pseudo-registers.
	register["SB"] = RSB
	register["FP"] = RFP
	register["PC"] = RPC