tests: Move run-pass tests without naming conflicts to ui

src/test/ui/numbers-arithmetic/float_math.rs

@@ -0,0 +1,21 @@
+// run-pass
+#![feature(core_intrinsics)]
+
+use std::intrinsics::{fadd_fast, fsub_fast, fmul_fast, fdiv_fast, frem_fast};
+
+#[inline(never)]
+pub fn test_operations(a: f64, b: f64) {
+    // make sure they all map to the correct operation
+    unsafe {
+        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.);
+}