// abs(sin(pi * frac(x))), where frac(x) is the fractional part of x.  This
    // is more numerically accurate: It doesn't overflow to inf like pi * x can,
    // and if x is an integer, it evaluates to 0 exactly, which is significant
    // because we then take the log of this value, and log(0) is inf.
    //
    // We don't have a frac(x) primitive in XLA and computing it is tricky, but

		{"0.5", 11, "1024"},
		{"-0.5", -2, "-0.125"},
		{"32", 5, "1024"},
		{"1024", -10, "1"},
	} {
		frac := makeFloat(test.frac)
		want := makeFloat(test.z)
		var z Float
		z.SetMantExp(frac, test.exp)
		if !alike(&z, want) {
			t.Errorf("SetMantExp(%s, %d) = %s; want %s", test.frac, test.exp, z.Text('g', 10), test.z)
		}
		// test inverse property
		mant := new(Float)