{
			name: "Reverse",
			in:   19,
			out:  [4]any{bits.Reverse8(19), bits.Reverse16(19), bits.Reverse32(19), bits.Reverse64(19)},
		},
		{
			name: "ReverseBytes",
			in:   15,
			out:  [4]any{nil, bits.ReverseBytes16(15), bits.ReverseBytes32(15), bits.ReverseBytes64(15)},
		},
		{
			name: "Len",
			in:   8,
			out:  [4]any{bits.Len8(8), bits.Len16(8), bits.Len32(8), bits.Len64(8)},
		},
	} {

	// 1100100000000000000000000000000000000000000000000000000000000000
}

func ExampleReverseBytes16() {
	fmt.Printf("%016b\n", 15)
	fmt.Printf("%016b\n", bits.ReverseBytes16(15))
	// Output:
	// 0000000000001111
	// 0000111100000000
}

func ExampleReverseBytes32() {
	fmt.Printf("%032b\n", 15)
	fmt.Printf("%032b\n", bits.ReverseBytes32(15))
	// Output:

	if UintSize == 32 {
		return uint(ReverseBytes32(uint32(x)))
	}
	return uint(ReverseBytes64(uint64(x)))
}

// ReverseBytes16 returns the value of x with its bytes in reversed order.
//
// This function's execution time does not depend on the inputs.
func ReverseBytes16(x uint16) uint16 {
	return x>>8 | x<<8
}

// ReverseBytes32 returns the value of x with its bytes in reversed order.
//

	// 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    //
// --------------------- //

pkg math/bits, func Reverse32(uint32) uint32
pkg math/bits, func Reverse64(uint64) uint64
pkg math/bits, func Reverse8(uint8) uint8
pkg math/bits, func ReverseBytes(uint) uint
pkg math/bits, func ReverseBytes16(uint16) uint16
pkg math/bits, func ReverseBytes32(uint32) uint32
pkg math/bits, func ReverseBytes64(uint64) uint64
pkg math/bits, func RotateLeft(uint, int) uint
pkg math/bits, func RotateLeft16(uint16, int) uint16

		testReverseBytes(t, test.r, test.x)
	}
}

func testReverseBytes(t *testing.T, x64, want64 uint64) {
	x16 := uint16(x64)
	got16 := ReverseBytes16(x16)
	want16 := uint16(want64 >> (64 - 16))
	if got16 != want16 {
		t.Fatalf("ReverseBytes16(%#04x) == %#04x; want %#04x", x16, got16, want16)
	}

	x32 := uint32(x64)
	got32 := ReverseBytes32(x32)
	want32 := uint32(want64 >> (64 - 32))

		{name: "BRW", argLength: 1, reg: gp11, asm: "BRW"},                                              // reversebytes32(arg0)
		{name: "BRH", argLength: 1, reg: gp11, asm: "BRH"},                                              // reversebytes16(arg0)
		{name: "FNEG", argLength: 1, reg: fp11, asm: "FNEG"},                                            // -arg0 (floating point)

	// ReverseBytes inlines correctly, no need to intrinsify it.
	// Nothing special is needed for targets where ReverseBytes16 lowers to a rotate
	// On Power10, 16-bit rotate is not available so use BRH instruction
	if buildcfg.GOPPC64 >= 10 {
		addF("math/bits", "ReverseBytes16",
			func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
				return s.newValue1(ssa.OpBswap16, types.Types[types.TUINT], args[0])

		{"Rem64", Func, 14},
		{"Reverse", Func, 9},
		{"Reverse16", Func, 9},
		{"Reverse32", Func, 9},
		{"Reverse64", Func, 9},
		{"Reverse8", Func, 9},
		{"ReverseBytes", Func, 9},
		{"ReverseBytes16", Func, 9},
		{"ReverseBytes32", Func, 9},
		{"ReverseBytes64", Func, 9},
		{"RotateLeft", Func, 9},
		{"RotateLeft16", Func, 9},
		{"RotateLeft32", Func, 9},
		{"RotateLeft64", Func, 9},