1 files changed, 36 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/src/float/pow.rs b/vendor/compiler_builtins/src/float/pow.rs
new file mode 100644
index 000000000..a75340c30
--- /dev/null
+++ b/vendor/compiler_builtins/src/float/pow.rs
@@ -0,0 +1,36 @@
+use float::Float;
+use int::Int;
+
+/// Returns `a` raised to the power `b`
+fn pow<F: Float>(a: F, b: i32) -> F {
+    let mut a = a;
+    let recip = b < 0;
+    let mut pow = Int::abs_diff(b, 0);
+    let mut mul = F::ONE;
+    loop {
+        if (pow & 1) != 0 {
+            mul *= a;
+        }
+        pow >>= 1;
+        if pow == 0 {
+            break;
+        }
+        a *= a;
+    }
+
+    if recip {
+        F::ONE / mul
+    } else {
+        mul
+    }
+}
+
+intrinsics! {
+    pub extern "C" fn __powisf2(a: f32, b: i32) -> f32 {
+        pow(a, b)
+    }
+
+    pub extern "C" fn __powidf2(a: f64, b: i32) -> f64 {
+        pow(a, b)
+    }
+}