Update float_math test to not use constants

src/test/run-pass/float_math.rs

@@ -12,13 +12,19 @@
 
 use std::intrinsics::{fadd_fast, fsub_fast, fmul_fast, fdiv_fast, frem_fast};
 
-fn main() {
+#[inline(never)]
+pub fn test_operations(a: f64, b: f64) {
     // make sure they all map to the correct operation
     unsafe {
-        assert_eq!(fadd_fast(1., 2.), 1. + 2.);
-        assert_eq!(fsub_fast(1., 2.), 1. - 2.);
-        assert_eq!(fmul_fast(2., 3.), 2. * 3.);
-        assert_eq!(fdiv_fast(10., 5.), 10. / 5.);
-        assert_eq!(frem_fast(10., 5.), 10. % 5.);
+        assert_eq!(fadd_fast(a, b), a + b);
+        assert_eq!(fsub_fast(a, b), a - b);
+        assert_eq!(fmul_fast(a, b), a * b);
+        assert_eq!(fdiv_fast(a, b), a / b);
+        assert_eq!(frem_fast(a, b), a % b);
     }
 }
+
+fn main() {
+    test_operations(1., 2.);
+    test_operations(10., 5.);
+}