const bufSize = 16 << 10
	buf := make([]byte, bufSize)
	r := bytes.NewReader(buf)
	srcReader := NewReaderSize(onlyReader{r}, 1<<10)
	if _, ok := io.Discard.(io.ReaderFrom); !ok {
		b.Fatal("io.Discard doesn't support ReaderFrom")
	}
	for i := 0; i < b.N; i++ {
		r.Seek(0, io.SeekStart)
		srcReader.Reset(onlyReader{r})
		n, err := srcReader.WriteTo(io.Discard)
		if err != nil {
			b.Fatal(err)
		}

		}
	}
	// for the last entry, we cannot use 0, otherwise
	// in case all __cgodebug_data is zero initialized,
	// LLVM-based gcc will place the it in the __DATA.__common
	// zero-filled section (our debug/macho doesn't support
	// this)
	fmt.Fprintf(&b, "\t1\n")
	fmt.Fprintf(&b, "};\n")

	// do the same work for floats.
	fmt.Fprintf(&b, "double __cgodebug_floats[] = {\n")
	for _, n := range names {
		if n.Kind == "fconst" {

	ADD	$1, R2, R3
	ADD	R1<<R2, R3, R4
	ADD	R1>>R2, R3, R4
	ADD	R1@>R2, R3, R4
	ADD	R1->R2, R3, R4
	ADD	R1, R2, R3
	ADD	R(1)<<R(2), R(3), R(4) // ADD	R1<<R2, R3, R4

//	LTYPE1 cond imsr ',' spreg ',' // asm doesn't support trailing comma.
//	{
//		outcode($1, $2, &$3, $5, &nullgen);
//	}
//	LTYPE1 cond imsr ',' reg
//	{
//		outcode($1, $2, &$3, 0, &$5);
//	}
	ADD	$1, R2
	ADD	R1<<R2, R3
	ADD	R1>>R2, R3
	ADD	R1@>R2, R3

	MOVMW 4(R3), R4                 // b8830004


	// Verify supported bdnz/bdz encodings.
	BC 16,0,0(PC)                   // BC $16, CR0LT, 0(PC) // 42000000
	BDNZ 0(PC)                      // 42000000
	BDZ 0(PC)                       // 42400000
	BC 18,0,0(PC)                   // BC $18, CR0LT, 0(PC) // 42400000

	// Verify the supported forms of bcclr[l]
	BC $20,CR0LT,$1,LR              // 4e800820