1 files changed, 33 insertions, 0 deletions
diff --git a/library/core/tests/num/dec2flt/float.rs b/library/core/tests/num/dec2flt/float.rs
new file mode 100644
index 000000000..7a9587a18
--- /dev/null
+++ b/library/core/tests/num/dec2flt/float.rs
@@ -0,0 +1,33 @@
+use core::num::dec2flt::float::RawFloat;
+
+#[test]
+fn test_f32_integer_decode() {
+    assert_eq!(3.14159265359f32.integer_decode(), (13176795, -22, 1));
+    assert_eq!((-8573.5918555f32).integer_decode(), (8779358, -10, -1));
+    assert_eq!(2f32.powf(100.0).integer_decode(), (8388608, 77, 1));
+    assert_eq!(0f32.integer_decode(), (0, -150, 1));
+    assert_eq!((-0f32).integer_decode(), (0, -150, -1));
+    assert_eq!(f32::INFINITY.integer_decode(), (8388608, 105, 1));
+    assert_eq!(f32::NEG_INFINITY.integer_decode(), (8388608, 105, -1));
+
+    // Ignore the "sign" (quiet / signalling flag) of NAN.
+    // It can vary between runtime operations and LLVM folding.
+    let (nan_m, nan_e, _nan_s) = f32::NAN.integer_decode();
+    assert_eq!((nan_m, nan_e), (12582912, 105));
+}
+
+#[test]
+fn test_f64_integer_decode() {
+    assert_eq!(3.14159265359f64.integer_decode(), (7074237752028906, -51, 1));
+    assert_eq!((-8573.5918555f64).integer_decode(), (4713381968463931, -39, -1));
+    assert_eq!(2f64.powf(100.0).integer_decode(), (4503599627370496, 48, 1));
+    assert_eq!(0f64.integer_decode(), (0, -1075, 1));
+    assert_eq!((-0f64).integer_decode(), (0, -1075, -1));
+    assert_eq!(f64::INFINITY.integer_decode(), (4503599627370496, 972, 1));
+    assert_eq!(f64::NEG_INFINITY.integer_decode(), (4503599627370496, 972, -1));
+
+    // Ignore the "sign" (quiet / signalling flag) of NAN.
+    // It can vary between runtime operations and LLVM folding.
+    let (nan_m, nan_e, _nan_s) = f64::NAN.integer_decode();
+    assert_eq!((nan_m, nan_e), (6755399441055744, 972));
+}