return op + " " + args[0] + "," + args[1]

	case STXVL, STXVLL:
		return op + " " + args[0] + "," + args[1] + "," + args[2]

	case LWAX, LWAUX, LWZX, LHZX, LBZX, LDX, LHAX, LHAUX, LDARX, LWARX, LHARX, LBARX, LFDX, LFDUX, LFSX, LFSUX, LDBRX, LWBRX, LHBRX, LDUX, LWZUX, LHZUX, LBZUX:
		if args[1] == "0" {
			return op + " (" + args[2] + ")," + args[0]
		}
		return op + " (" + args[2] + ")(" + args[1] + ")," + args[0]

	case STH, STHU, STHX, STHUX:
		return true
	case STW, STWU, STWX, STWUX:
		return true
	case STD, STDU, STDX, STDUX:
		return true
	case STQ:
		return true
	case LHBRX, LWBRX, STHBRX, STWBRX:
		return true
	case LBARX, LWARX, LHARX, LDARX:
		return true
	}
	return false

        assertContentType("application/gzip", "extractor/gz/test.tar.gz", "hoge.tar.gz");
        assertContentType("application/zip", "extractor/zip/test.zip", "hoge.zip");
        assertContentType("application/x-lharc", "extractor/lha/test.lzh", "hoge.lzh"); // TODO is it correct?

        assertContentType("application/xml", "extractor/test.mm", "hoge.mm");