MOVL 	AX, ret+16(FP)
	RET

// func Or64(addr *uint64, v uint64) old uint64
TEXT ·Or64(SB), NOSPLIT, $0-24
	MOVQ	ptr+0(FP), BX
	MOVQ	val+8(FP), CX
casloop:
	MOVQ 	CX, DX
	MOVQ	(BX), AX
	ORQ	AX, DX
	LOCK
	CMPXCHGQ	DX, (BX)
	JNZ casloop
	MOVQ 	AX, ret+16(FP)
	RET

// func And64(addr *uint64, v uint64) old uint64
TEXT ·And64(SB), NOSPLIT, $0-24
	MOVQ	ptr+0(FP), BX
	MOVQ	val+8(FP), CX

	MOVQ acc4, t0
	ORQ acc5, t0
	ORQ acc6, t0
	ORQ acc7, t0

	// Set the zero flag if so. (CMOV of a constant to a register doesn't
	// appear to be supported in Go. Thus t1 = 1.)
	CMOVQEQ t1, AX

	// XOR [acc4..acc7] with P and compare with zero again.
	XORQ $-1, acc4
	XORQ p256const0<>(SB), acc5
	XORQ p256const1<>(SB), acc7
	ORQ acc5, acc4
	ORQ acc6, acc4
	ORQ acc7, acc4

// but ORQ is the only one I've actually seen occur.
(ORQ (MOVQconst [c]) (MOVQconst [d])) => (MOVQconst [c|d])

// generic simplifications
// TODO: more of this
(ADDQ x (NEGQ y)) => (SUBQ x y)
(ADDL x (NEGL y)) => (SUBL x y)
(SUBQ x x) => (MOVQconst [0])
(SUBL x x) => (MOVLconst [0])
(ANDQ x x) => x
(ANDL x x) => x
(ORQ x x)  => x
(ORL x x)  => x

}

func biton64(a, b uint64) (n uint64) {
	// amd64:"BTSQ"
	n += b | (1 << (a & 63))

	// amd64:"BTSQ\t[$]63"
	n += a | (1 << 63)

	// amd64:"BTSQ\t[$]60"
	n += a | (1 << 60)

	// amd64:"ORQ\t[$]1"
	n += a | (1 << 0)

	return n
}

func bitoff64(a, b uint64) (n uint64) {
	// amd64:"BTRQ"
	n += b &^ (1 << (a & 63))

	// amd64:"BTRQ\t[$]63"
	n += a &^ (1 << 63)

	"MULXL",
	"MULXQ",
	"MWAIT",
	"NEGB",
	"NEGL",
	"NEGQ",
	"NEGW",
	"NOPL",
	"NOPW",
	"NOTB",
	"NOTL",
	"NOTQ",
	"NOTW",
	"ORB",
	"ORL",
	"ORPD",
	"ORPS",
	"ORQ",
	"ORW",
	"OUTB",
	"OUTL",
	"OUTSB",
	"OUTSL",
	"OUTSW",
	"OUTW",
	"PABSB",
	"PABSD",
	"PABSW",
	"PACKSSLW",
	"PACKSSWB",
	"PACKUSDW",
	"PACKUSWB",
	"PADDB",

	ORQ DX, (BX)                            // 480913
	ORQ R11, (BX)                           // 4c091b
	ORQ DX, (R11)                           // 490913
	ORQ R11, (R11)                          // 4d091b
	ORQ DX, DX                              // 4809d2 or 480bd2
	ORQ R11, DX                             // 4c09da or 490bd3
	ORQ DX, R11                             // 4909d3 or 4c0bda

	JEQ	nog1
	LEAQ	m_tls(R13), R8
#ifdef GOOS_android
	// Android stores the TLS offset in runtime·tls_g.
	SUBQ	runtime·tls_g(SB), R8
#else
	ADDQ	$8, R8	// ELF wants to use -8(FS)
#endif
	ORQ 	$0x00080000, DI //add flag CLONE_SETTLS(0x00080000) to call clone
nog1:
	MOVL	$SYS_clone, AX
	SYSCALL

	// In parent, return.
	CMPQ	AX, $0
	JEQ	3(PC)
	MOVL	AX, ret+40(FP)
	RET

			v.reset(OpAMD64MOVQconst)
			v.AuxInt = int64ToAuxInt(c | d)
			return true
		}
		break
	}
	// match: (ORQ x x)
	// result: x
	for {
		x := v_0
		if x != v_1 {
			break
		}
		v.copyOf(x)
		return true
	}
	// match: (ORQ x l:(MOVQload [off] {sym} ptr mem))
	// cond: canMergeLoadClobber(v, l, x) && clobber(l)
	// result: (ORQload x [off] {sym} ptr mem)

GLOBL masks<>(SB),RODATA,$256

// 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.

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