Add FloatMath.pow.

Change-Id: I5c584f4894caba47fccfa22ba95f8665990d516c

Author: Jeff Brown

api/current.txt

@@ -22896,6 +22896,7 @@ package android.util {
     method public static float exp(float);
     method public static float floor(float);
     method public static float hypot(float, float);
+    method public static float pow(float, float);
     method public static float sin(float);
     method public static float sqrt(float);
   }

core/java/android/util/FloatMath.java

@@ -81,6 +81,16 @@ private FloatMath() {}
      */
     public static native float exp(float value);
 
+    /**
+     * Returns the closest float approximation of the result of raising {@code
+     * x} to the power of {@code y}.
+     *
+     * @param x the base of the operation.
+     * @param y the exponent of the operation.
+     * @return {@code x} to the power of {@code y}.
+     */
+    public static native float pow(float x, float y);
+
     /**
      * Returns {@code sqrt(}<i>{@code x}</i><sup>{@code 2}</sup>{@code +} <i>
      * {@code y}</i><sup>{@code 2}</sup>{@code )}.

core/jni/android_util_FloatMath.cpp

@@ -30,6 +30,10 @@ class MathUtilsGlue {
         return expf(x);
     }
 
+    static float PowF(JNIEnv* env, jobject clazz, float x, float y) {
+        return powf(x, y);
+    }
+
     static float HypotF(JNIEnv* env, jobject clazz, float x, float y) {
         return hypotf(x, y);
     }
@@ -42,6 +46,7 @@ static JNINativeMethod gMathUtilsMethods[] = {
     {"cos", "(F)F", (void*) MathUtilsGlue::CosF},
     {"sqrt", "(F)F", (void*) MathUtilsGlue::SqrtF},
     {"exp", "(F)F", (void*) MathUtilsGlue::ExpF},
+    {"pow", "(FF)F", (void*) MathUtilsGlue::PowF},
     {"hypot", "(FF)F", (void*) MathUtilsGlue::HypotF},
 };