((SHLL|SHRL|SARL) x (NEGQ <t> (ADDQconst [c] y))) && c & 31 == 0  => ((SHLL|SHRL|SARL) x (NEGQ <t> y))
((SHLL|SHRL|SARL) x (ANDQconst [c] y)) && c & 31 == 31 => ((SHLL|SHRL|SARL) x y)
((SHLL|SHRL|SARL) x (NEGQ <t> (ANDQconst [c] y))) && c & 31 == 31 => ((SHLL|SHRL|SARL) x (NEGQ <t> y))

((SHLQ|SHRQ|SARQ) x (ADDLconst [c] y)) && c & 63 == 0  => ((SHLQ|SHRQ|SARQ) x y)

// optimized into shifts and ands

func LenDiv1(a []int) int {
	// 386:"SHRL\t[$]10"
	// amd64:"SHRQ\t[$]10"
	// arm64:"LSR\t[$]10",-"SDIV"
	// arm:"SRL\t[$]10",-".*udiv"
	// ppc64x:"SRD"\t[$]10"
	return len(a) / 1024
}

func LenDiv2(s string) int {
	// 386:"SHRL\t[$]11"
	// amd64:"SHRQ\t[$]11"
	// arm64:"LSR\t[$]11",-"SDIV"
	// arm:"SRL\t[$]11",-".*udiv"
	// ppc64x:"SRD\t[$]11"

//   SIGMA0(x) = ROTR(7,x) XOR ROTR(18,x) XOR SHR(3,x)
//   SIGMA1(x) = ROTR(17,x) XOR ROTR(19,x) XOR SHR(10,x)
#define MSGSCHEDULE1(index) \
	MOVL	((index-2)*4)(BP), AX; \
	MOVL	AX, CX; \
	RORL	$17, AX; \
	MOVL	CX, DX; \
	RORL	$19, CX; \
	SHRL	$10, DX; \
	MOVL	((index-15)*4)(BP), BX; \
	XORL	CX, AX; \
	MOVL	BX, CX; \
	XORL	DX, AX; \
	RORL	$7, BX; \
	MOVL	CX, DX; \
	SHRL	$3, DX; \
	RORL	$18, CX; \

		}
		v.reset(OpAMD64SHLXQ)
		v.AddArg2(x, y)
		return true
	}
	return false
}
func rewriteValueAMD64latelower_OpAMD64SHRL(v *Value) bool {
	v_1 := v.Args[1]
	v_0 := v.Args[0]
	// match: (SHRL x y)
	// cond: buildcfg.GOAMD64 >= 3
	// result: (SHRXL x y)
	for {
		x := v_0
		y := v_1
		if !(buildcfg.GOAMD64 >= 3) {
			break
		}
		v.reset(OpAMD64SHRXL)
		v.AddArg2(x, y)
		return true

	// s390x:"STMG"
	p[0] = x
	// s390x:-"STMG",-"MOVD"
	p[1] = y
}

func store32le(p *struct{ a, b uint32 }, x uint64) {
	// amd64:"MOVQ",-"MOVL",-"SHRQ"
	// arm64:"MOVD",-"MOVW",-"LSR"
	// ppc64le:"MOVD",-"MOVW",-"SRD"
	p.a = uint32(x)
	// amd64:-"MOVL",-"SHRQ"
	// arm64:-"MOVW",-"LSR"
	// ppc64le:-"MOVW",-"SRD"
	p.b = uint32(x >> 32)
}
func store32be(p *struct{ a, b uint32 }, x uint64) {

//   SIGMA0(x) = ROTR(7,x) XOR ROTR(18,x) XOR SHR(3,x)
//   SIGMA1(x) = ROTR(17,x) XOR ROTR(19,x) XOR SHR(10,x)
#define MSGSCHEDULE1(index) \
	MOVL	((index-2)*4)(BP), AX; \
	MOVL	AX, CX; \
	RORL	$17, AX; \
	MOVL	CX, DX; \
	RORL	$19, CX; \
	SHRL	$10, DX; \
	MOVL	((index-15)*4)(BP), BX; \
	XORL	CX, AX; \
	MOVL	BX, CX; \
	XORL	DX, AX; \
	RORL	$7, BX; \
	MOVL	CX, DX; \
	SHRL	$3, DX; \
	RORL	$18, CX; \

ssh-ed25519
******@****.***
sk-ecdsa-sha2******@****.***
ecdsa-sha2-nistp256
ecdsa-sha2-nistp384
ecdsa-sha2-nistp521
rsa-sha2-256
rsa-sha2-512
ssh-rsa
ssh-dss
```

`--sftp=kex-algos=...` specifies the supported key-exchange algorithms in preference order.

Valid values: 

```
curve25519-sha256
******@****.***
ecdh-sha2-nistp256
ecdh-sha2-nistp384

	ADDQ   R10, R13
	ANDQ   AX, R15
	ADDQ   R12, R15

	// Second reduction chain (carryPropagate)
	MOVQ   DI, SI
	SHRQ   $0x33, SI
	MOVQ   R9, R8
	SHRQ   $0x33, R8
	MOVQ   R11, R10
	SHRQ   $0x33, R10
	MOVQ   R13, R12
	SHRQ   $0x33, R12
	MOVQ   R15, R14
	SHRQ   $0x33, R14
	ANDQ   AX, DI
	IMUL3Q $0x13, R14, R14
	ADDQ   R14, DI
	ANDQ   AX, R9
	ADDQ   SI, R9
	ANDQ   AX, R11

(MOVLQZX x) && zeroUpper32Bits(x,3)...

	Comment("Second reduction chain (carryPropagate)")
	// c0 = r0 >> 51
	MOVQ(r0lo, c0)
	SHRQ(Imm(51), c0)
	// c1 = r1 >> 51
	MOVQ(r1lo, c1)
	SHRQ(Imm(51), c1)
	// c2 = r2 >> 51
	MOVQ(r2lo, c2)
	SHRQ(Imm(51), c2)
	// c3 = r3 >> 51
	MOVQ(r3lo, c3)
	SHRQ(Imm(51), c3)
	// c4 = r4 >> 51
	MOVQ(r4lo, c4)
	SHRQ(Imm(51), c4)
	maskAndAdd(r0lo, maskLow51Bits, c4, 19)
	maskAndAdd(r1lo, maskLow51Bits, c0, 1)