cgen: use standard checks for float comparisons

vlib/builtin/float_test.v

@@ -34,3 +34,114 @@ fn test_float_decl() {
   assert typeof(x15) == 'f64'
   assert typeof(x16) == 'f64'
 }
+
+fn test_f32_equal_operator() {
+	b := f32(1.0)
+	mut a := f32(1.0)
+	a += 0.0000019073486328125
+	assert a != b
+	a -= 0.0000019073486328125
+	assert a == b
+	assert -1 == 1 * -1
+	assert -1.0 == 1.0 * -1.0
+	a = 1
+	a += 0.0000019073486328125
+	a -= 0.0000019073486328125
+	assert a == f32(1.0)
+	a += 0.000001
+	assert !(a < f32(1))
+	assert !(a <= f32(1))
+	assert a > f32(1)
+	assert a >= 1
+	assert a != 1
+	f := 1.2
+	ab := int(f)
+	assert ab == 1
+	e := f32(-1.602176634e-19)
+	m := f32(9.1093837015e-31)
+	assert e < m
+	assert e <= m
+	assert e != m
+	assert !(e == m)
+	assert m >= e
+	assert m > e
+}
+
+fn test_f64_equal_operator() {
+	b := 1.0
+	mut a := 1.0
+	a += 0.0000019073486328125
+	assert a != b
+	a -= 0.0000019073486328125
+	assert a == b
+	e := -1.602176634e-19
+	m := 9.1093837015e-31
+	assert e < m
+	assert e <= m
+	assert e != m
+	assert !(e == m)
+	assert m >= e
+	assert m > e
+}
+
+fn test_f64_eq_epsilon() {
+	a := 1.662248544459347e308
+	b := 1.662248544459348e308
+	x := 1.662248544459352e308
+	assert a != b
+	assert a.eq_epsilon(b)
+	assert b.eq_epsilon(a)
+	assert (-a).eq_epsilon(-b)
+	assert (-b).eq_epsilon(-a)
+	assert !a.eq_epsilon(x)
+	assert !x.eq_epsilon(a)
+	assert !a.eq_epsilon(-b)
+	assert !(-a).eq_epsilon(b)
+	c := 1.5367748374385438503
+	d := -1.5367748374385447257
+	z := 1.5367748378943546
+	assert c != -d
+	assert c.eq_epsilon(-d)
+	assert d.eq_epsilon(-c)
+	assert !c.eq_epsilon(z)
+	assert !z.eq_epsilon(c)
+	e := 2.531434251587394233e-308
+	f := 2.531434251587395675e-308
+	y := 2.531434251587398934e-308
+	assert e != f
+	assert e.eq_epsilon(f)
+	assert (-f).eq_epsilon(-e)
+	assert !e.eq_epsilon(y)
+	assert !(-y).eq_epsilon(-e)
+}
+
+fn test_f32_eq_epsilon() {
+	a := f32(3.244331e38)
+	b := f32(3.244332e38)
+	x := f32(3.244338e38)
+	assert a != b
+	assert a.eq_epsilon(b)
+	assert b.eq_epsilon(a)
+	assert (-a).eq_epsilon(-b)
+	assert (-b).eq_epsilon(-a)
+	assert !a.eq_epsilon(x)
+	assert !(-x).eq_epsilon(-a)
+	assert !a.eq_epsilon(-b)
+	assert !(-a).eq_epsilon(b)
+	c := f32(0.9546742)
+	d := f32(-0.9546745)
+	z := f32(0.9546754)
+	assert c != -d
+	assert c.eq_epsilon(-d)
+	assert d.eq_epsilon(-c)
+	assert !c.eq_epsilon(z)
+	assert !z.eq_epsilon(c)
+	e := f32(-1.5004390e-38)
+	f := f32(-1.5004395e-38)
+	y := f32(-1.5004409e-38)
+	assert e != f
+	assert e.eq_epsilon(f)
+	assert (-f).eq_epsilon(-e)
+	assert !e.eq_epsilon(y)
+	assert !(-y).eq_epsilon(-e)
+}