Implement cbrt and hypot function calls

Author: kungfukennyg

src/fn_call.rs

@@ -560,6 +560,17 @@ pub trait EvalContextExt<'a, 'mir, 'tcx: 'a + 'mir>: crate::MiriEvalContextExt<'
                 let n = this.memory().get(ptr.alloc_id)?.read_c_str(tcx, ptr)?.len();
                 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
             }
+            "cbrt" => {
+                let f = this.read_scalar(args[0])?.to_f64()?;
+                let n = f.cbrt();
+                this.write_scalar(Scalar::from_f64(n), dest)?;
+            }
+            "hypot" => {
+                let f1 = this.read_scalar(args[0])?.to_f64()?;
+                let f2 = this.read_scalar(args[1])?.to_f64()?;
+                let n = f1.hypot(f2);
+                this.write_scalar(Scalar::from_f64(n), dest)?;
+            }
 
             // Some things needed for `sys::thread` initialization to go through.
             "signal" | "sigaction" | "sigaltstack" => {

tests/run-pass/cmath.rs

@@ -0,0 +1,13 @@
+fn cbrt(f: f64) -> f64 {
+    f.cbrt()
+}
+
+fn hypot(f1: f64, f2: f64) -> f64 {
+    f1.hypot(f2)
+}
+
+fn main() {
+    assert_eq!(cbrt(4.3), 1.6261333316791686);
+
+    assert_eq!(hypot(3.0, 4.0), 5.0);
+}