// s390x:"MOVWBR"
	// arm64:"REVW"
	// ppc64x/power10: "BRW"
	return bits.ReverseBytes32(n)
}

func ReverseBytes16(n uint16) uint16 {
	// amd64:"ROLW"
	// arm64:"REV16W",-"UBFX",-"ORR"
	// arm/5:"SLL","SRL","ORR"
	// arm/6:"REV16"
	// arm/7:"REV16"
	// ppc64x/power10: "BRH"
	return bits.ReverseBytes16(n)
}

// --------------------- //
//    bits.RotateLeft    //
// --------------------- //

		{name: "ORshiftLL", argLength: 2, reg: gp21, asm: "ORR", aux: "Int64"},                    // arg0 | arg1<<auxInt, auxInt should be in the range 0 to 63.
		{name: "ORshiftRL", argLength: 2, reg: gp21, asm: "ORR", aux: "Int64"},                    // arg0 | arg1>>auxInt, unsigned shift, auxInt should be in the range 0 to 63.

	// wasm:"F64Copysign"
	sink64[0] = math.Copysign(a, b)

	// amd64:"BTSQ\t[$]63"
	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
	// ppc64x:"FCPSGN"
	// riscv64:"FSGNJD"
	// arm64:"ORR", -"AND"
	sink64[1] = math.Copysign(c, -1)

	// Like math.Copysign(c, -1), but with integer operations. Useful
	// for platforms that have a copysign opcode to see if it's detected.

	a[1] = ^(y ^ z)

	// arm64:`EON\t`,-`XOR`
	a[2] = x ^ ^z

	// arm64:`EON\t`,-`EOR`,-`MVN`
	return n ^ (m ^ 0xffffffffffffffff)
}

func op_orn(x, y uint32) uint32 {
	// arm64:`ORN\t`,-`ORR`
	return x | ^y
}

// check bitsets
func bitSetPowerOf2Test(x int) bool {
	// amd64:"BTL\t[$]3"
	return x&8 == 8
}

func bitSetTest(x int) bool {
	// amd64:"ANDL\t[$]9, AX"

00000330  c3 fb 96 05 bf b5 bd bf  e2 28 07 7e 51 a6 84 90  |.........(.~Q...|
00000340  bf 9e 2e f6 b5 04 8e 06  7a 63 c8 00 84 a1 a3 2c  |........zc.....,|
00000350  f3 6f 52 52 c4 ce 4a 59  31 1f d4 ab 2e f4 75 90  |.oRR..JY1.....u.|
00000360  a5 3b ff ab 20 be 51 92  c5 f4 4d 8b f2 2a a7 ff  |.;.. .Q...M..*..|
00000370  90 07 40 3e d6 9c cf 23  54 d1 65 d3 74 79 af 51  |..@>...#T.e.ty.Q|

			o1 |= 1 << 10
		} else {
			o1 |= 3 << 10
		}
		o1 |= ((uint32(v) & 0x1FF) << 12) | (uint32(p.To.Reg&31) << 5) | uint32(p.From.Reg&31)

	case 24: /* mov/mvn Rs,Rd -> add $0,Rs,Rd or orr Rs,ZR,Rd */
		rf := int(p.From.Reg)
		rt := int(p.To.Reg)
		if rf == REGSP || rt == REGSP {
			if p.As == AMVN || p.As == AMVNW {
				c.ctxt.Diag("illegal SP reference\n%v", p)
			}