SHRQ	CX, SI	// move a's bit to bottom
	ANDQ	$1, SI	// mask bit
	LEAQ	-1(SI*2), AX // 1/0 => +1/-1
	RET

allsame:
	XORQ	AX, AX
	XORQ	CX, CX
	CMPQ	BX, DX
	SETGT	AX	// 1 if alen > blen
	SETEQ	CX	// 1 if alen == blen
	LEAQ	-1(CX)(AX*2), AX	// 1,0,-1 result
	RET

	// this works for >= 64 bytes of data.
#ifndef hasAVX2
big_loop:
	MOVOU	(SI), X0
	MOVOU	(DI), X1
	PCMPEQB X0, X1

	"SARB",
	"SARL",
	"SARQ",
	"SARW",
	"SARXL",
	"SARXQ",
	"SBBB",
	"SBBL",
	"SBBQ",
	"SBBW",
	"SCASB",
	"SCASL",
	"SCASQ",
	"SCASW",
	"SETCC",
	"SETCS",
	"SETEQ",
	"SETGE",
	"SETGT",
	"SETHI",
	"SETLE",
	"SETLS",
	"SETLT",
	"SETMI",
	"SETNE",
	"SETOC",
	"SETOS",
	"SETPC",
	"SETPL",
	"SETPS",
	"SFENCE",
	"SGDT",
	"SHA1MSG1",

		{name: "SBBLcarrymask", argLength: 1, reg: flagsgp, asm: "SBBL"}, // (int32)(-1) if carry is set, 0 if carry is clear.
		// Note: SBBW and SBBB are subsumed by SBBL

		{name: "SETEQ", argLength: 1, reg: readflags, asm: "SETEQ"}, // extract == condition from arg0
		{name: "SETNE", argLength: 1, reg: readflags, asm: "SETNE"}, // extract != condition from arg0

		{name: "SBBLcarrymask", argLength: 1, reg: flagsgp, asm: "SBBL"}, // (int32)(-1) if carry is set, 0 if carry is clear.
		// Note: SBBW and SBBB are subsumed by SBBL

		{name: "SETEQ", argLength: 1, reg: readflags, asm: "SETEQ"}, // extract == condition from arg0
		{name: "SETNE", argLength: 1, reg: readflags, asm: "SETNE"}, // extract != condition from arg0

    avatarUrl: https://avatars.githubusercontent.com/u/317045?u=f1349d5ffe84a19f324e204777859fbf69ddf633&v=4
    url: https://github.com/adamghill
  - login: eteq
    avatarUrl: https://avatars.githubusercontent.com/u/346587?v=4
    url: https://github.com/eteq
  - login: dmig
    avatarUrl: https://avatars.githubusercontent.com/u/388564?v=4
    url: https://github.com/dmig
  - login: securancy

			v.AddArg(v0)
			return true
		}
		break
	}
	// match: (SETEQ (InvertFlags x))
	// result: (SETEQ x)
	for {
		if v_0.Op != OpAMD64InvertFlags {
			break
		}
		x := v_0.Args[0]
		v.reset(OpAMD64SETEQ)
		v.AddArg(x)
		return true
	}
	// match: (SETEQ (FlagEQ))
	// result: (MOVLconst [1])
	for {
		if v_0.Op != OpAMD64FlagEQ {
			break

	return false
}
func rewriteValue386_Op386SETEQ(v *Value) bool {
	v_0 := v.Args[0]
	// match: (SETEQ (InvertFlags x))
	// result: (SETEQ x)
	for {
		if v_0.Op != Op386InvertFlags {
			break
		}
		x := v_0.Args[0]
		v.reset(Op386SETEQ)
		v.AddArg(x)
		return true
	}
	// match: (SETEQ (FlagEQ))
	// result: (MOVLconst [1])
	for {
		if v_0.Op != Op386FlagEQ {
			break
		}

				// MOVSS, SQRTSS, etc
				src = 4
				break
			}
			if op == "MOVO" || op == "MOVOU" {
				src = 16
				break
			}
			if strings.HasPrefix(op, "SET") {
				// SETEQ, etc
				src = 1
				break
			}
			switch op[len(op)-1] {
			case 'B':
				src = 1
			case 'W':
				src = 2
			case 'L':
				src = 4
			case 'D', 'Q':
				src = 8
			}

TEXT ·checkASM(SB),NOSPLIT,$0-1
	// check that masks<>(SB) and shifts<>(SB) are aligned to 16-byte
	MOVL	$masks<>(SB), AX
	MOVL	$shifts<>(SB), BX
	ORL	BX, AX
	TESTL	$15, AX
	SETEQ	ret+0(FP)
	RET

TEXT runtime·return0(SB), NOSPLIT, $0
	MOVL	$0, AX
	RET

// Called from cgo wrappers, this function returns g->m->curg.stack.hi.
// Must obey the gcc calling convention.

// func checkASM() bool
TEXT ·checkASM(SB),NOSPLIT,$0-1
	// check that masks<>(SB) and shifts<>(SB) are aligned to 16-byte
	MOVQ	$masks<>(SB), AX
	MOVQ	$shifts<>(SB), BX
	ORQ	BX, AX
	TESTQ	$15, AX
	SETEQ	ret+0(FP)
	RET

// these are arguments to pshufb. They move data down from
// the high bytes of the register to the low bytes of the register.
// index is how many bytes to move.