}

		x32 := uint32(X)
		y32 := uint32(Y >> 32)

		X32 := T.Bswap32(x32) // ERROR "intrinsic substitution for Bswap32"
		Y32 := T.Bswap32(y32) // ERROR "intrinsic substitution for Bswap32"
		if y32 != X32 {
			logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", x32, y32, X32)
		}
		if x32 != Y32 {
			logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", y32, x32, Y32)
		}
	}

	y := sys.Bswap64(x)
	if y != 0x8877665544332211 {
		t.Errorf("Bswap(%x)=%x, want 0x8877665544332211", x, y)
	}
}
func TestBswap32(t *testing.T) {
	x := uint32(0x11223344)
	y := sys.Bswap32(x)
	if y != 0x44332211 {
		t.Errorf("Bswap(%x)=%x, want 0x44332211", x, y)
	}

		// The same applies to Bswap32.
		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "TrailingZeros64")
		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "TrailingZeros32")
		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "Bswap32")
	}

	b = (x & c16) << 16
	x = a | b
	c32 := uint64(0x00000000ffffffff)
	a = x >> 32 & c32
	b = (x & c32) << 32
	x = a | b
	return x
}

// Bswap32 returns its input with byte order reversed
// 0x01020304 -> 0x04030201
func Bswap32(x uint32) uint32 {
	c8 := uint32(0x00ff00ff)
	a := x >> 8 & c8
	b := (x & c8) << 8
	x = a | b
	c16 := uint32(0x0000ffff)
	a = x >> 16 & c16
	b = (x & c16) << 16

	(Add32 <typ.Int>
		(BitLen32 <typ.Int> (Int64Hi x))
		(BitLen32 <typ.Int>
			(Or32 <typ.UInt32>
				(Int64Lo x)
				(Zeromask (Int64Hi x)))))

(Bswap64 x) =>
	(Int64Make
		(Bswap32 <typ.UInt32> (Int64Lo x))
		(Bswap32 <typ.UInt32> (Int64Hi x)))

(SignExt32to64 x) => (Int64Make (Signmask x) x)
(SignExt16to64 x) => (SignExt32to64 (SignExt16to32 x))
(SignExt8to64 x) => (SignExt32to64 (SignExt8to32 x))

	unalignedOK    bool        // Unaligned loads/stores are ok
	haveBswap64    bool        // architecture implements Bswap64
	haveBswap32    bool        // architecture implements Bswap32
	haveBswap16    bool        // architecture implements Bswap16
}

type (
	blockRewriter func(*Block) bool
	valueRewriter func(*Value) bool
)

type Types struct {
	Bool       *types.Type

		return true
	}
}
func rewriteValuedec64_OpBswap64(v *Value) bool {
	v_0 := v.Args[0]
	b := v.Block
	typ := &b.Func.Config.Types
	// match: (Bswap64 x)
	// result: (Int64Make (Bswap32 <typ.UInt32> (Int64Lo x)) (Bswap32 <typ.UInt32> (Int64Hi x)))
	for {
		x := v_0
		v.reset(OpInt64Make)
		v0 := b.NewValue0(v.Pos, OpBswap32, typ.UInt32)
		v1 := b.NewValue0(v.Pos, OpInt64Lo, typ.UInt32)
		v1.AddArg(x)

// and leaves it alone elsewhere.
func bswapIfBigEndian(x uintptr) uintptr {
	if goarch.BigEndian {
		if goarch.PtrSize == 8 {
			return uintptr(sys.Bswap64(uint64(x)))
		}
		return uintptr(sys.Bswap32(uint32(x)))
	}
	return x
}

// newUserArenaChunk allocates a user arena chunk, which maps to a single
// heap arena and single span. Returns a pointer to the base of the chunk

	{name: "BitLen32", argLength: 1},     // Number of bits in arg[0] (returns 0-32)
	{name: "BitLen64", argLength: 1},     // Number of bits in arg[0] (returns 0-64)

	{name: "Bswap16", argLength: 1}, // Swap bytes
	{name: "Bswap32", argLength: 1}, // Swap bytes
	{name: "Bswap64", argLength: 1}, // Swap bytes

	{name: "BitRev8", argLength: 1},  // Reverse the bits in arg[0]
	{name: "BitRev16", argLength: 1}, // Reverse the bits in arg[0]

// result = t4 ^ t5            -- (d,   c,   b,   a  )
// using shifted ops this can be done in 4 instructions.
(Bswap32 <t> x) && buildcfg.GOARM.Version==5 =>
	(XOR <t>
		(SRLconst <t> (BICconst <t> (XOR <t> x (SRRconst <t> [16] x)) [0xff0000]) [8])
		(SRRconst <t> x [8]))

// byte swap for ARMv6 and above
(Bswap32 x) && buildcfg.GOARM.Version>=6 => (REV x)

// boolean ops -- booleans are represented with 0=false, 1=true