ipa: libipa: pwl: Make the empty() function inline

The Pwl::empty() function is a one-liner that can be easily optimized by
the compiler given the chance. Make it inline.

While at it, move the function documentation block to match the class
declaration order.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

2 files changed, 7 insertions, 10 deletions

diff --git a/src/ipa/libipa/pwl.cpp b/src/ipa/libipa/pwl.cpp
index 1ba01085..d8ea92be 100644
--- a/src/ipa/libipa/pwl.cpp
+++ b/src/ipa/libipa/pwl.cpp
@@ -183,6 +183,12 @@ void Pwl::prepend(double x, double y, const double eps)
 }
 
 /**
+ * \fn Pwl::empty() const
+ * \brief Check if the piecewise linear function is empty
+ * \return True if there are no points in the function, false otherwise
+ */
+
+/**
  * \brief Get the domain of the piecewise linear function
  * \return An interval representing the domain
  */
@@ -204,15 +210,6 @@ Pwl::Interval Pwl::range() const
 }
 
 /**
- * \brief Check if the piecewise linear function is empty
- * \return True if there are no points in the function, false otherwise
- */
-bool Pwl::empty() const
-{
-	return points_.empty();
-}
-
-/**
  * \brief Evaluate the piecewise linear function
  * \param[in] x The x value to input into the function
  * \param[inout] span Initial guess for span
diff --git a/src/ipa/libipa/pwl.h b/src/ipa/libipa/pwl.h
index 4cc257f9..b4de00cf 100644
--- a/src/ipa/libipa/pwl.h
+++ b/src/ipa/libipa/pwl.h
@@ -51,7 +51,7 @@ public:
 
 	void append(double x, double y, double eps = 1e-6);
 
-	bool empty() const;
+	bool empty() const { return points_.empty(); }
 	Interval domain() const;
 	Interval range() const;