diff --git a/src/p_maputl.c b/src/p_maputl.c
index b6d8d1ff3..ccd457efc 100644
--- a/src/p_maputl.c
+++ b/src/p_maputl.c
@@ -101,17 +101,6 @@ void P_ClosestPointOnLine3D(const vector3_t *p, const vector3_t *Line, vector3_t
 	return;
 }
 
-//
-// P_PointOnLineSide
-// Returns 0 or 1
-//
-INT32 P_PointOnLineSide(fixed_t x, fixed_t y, const line_t *line)
-{
-	// use cross product to determine side quickly
-	INT64 v = ((INT64)y - line->v1->y) * line->dx - ((INT64)x - line->v1->x) * line->dy;
-	return v > 0;
-}
-
 //
 // P_BoxOnLineSide
 // Considers the line to be infinite
@@ -149,7 +138,7 @@ INT32 P_BoxOnLineSide(const fixed_t *tmbox, const line_t *ld)
 // P_PointOnDivlineSide
 // Returns 0 or 1.
 //
-static INT32 P_PointOnDivlineSide(fixed_t x, fixed_t y, const divline_t *line)
+FUNCMATH FUNCINLINE static ATTRINLINE INT32 P_PointOnDivlineSide(fixed_t x, fixed_t y, const divline_t *line)
 {
 	// use cross product to determine side quickly
 	INT64 v = ((INT64)y - line->y) * line->dx - ((INT64)x - line->x) * line->dy;
diff --git a/src/p_maputl.h b/src/p_maputl.h
index 698bd878d..b117b73f6 100644
--- a/src/p_maputl.h
+++ b/src/p_maputl.h
@@ -48,7 +48,18 @@ boolean P_PathTraverse(fixed_t px1, fixed_t py1, fixed_t px2, fixed_t py2,
 #define P_AproxDistance(dx, dy) FixedHypot(dx, dy)
 void P_ClosestPointOnLine(fixed_t x, fixed_t y, const line_t *line, vertex_t *result);
 void P_ClosestPointOnLine3D(const vector3_t *p, const vector3_t *line, vector3_t *result);
-INT32 P_PointOnLineSide(fixed_t x, fixed_t y, const line_t *line);
+
+//
+// P_PointOnLineSide
+// Returns 0 or 1
+//
+FUNCMATH FUNCINLINE static ATTRINLINE INT32 P_PointOnLineSide(fixed_t x, fixed_t y, const line_t *line)
+{
+	// use cross product to determine side quickly
+	INT64 v = ((INT64)y - line->v1->y) * line->dx - ((INT64)x - line->v1->x) * line->dy;
+	return v > 0;
+}
+
 void P_MakeDivline(const line_t *li, divline_t *dl);
 
 struct opening_t