diff --git a/src/compiler/shader_enums.h b/src/compiler/shader_enums.h
index 5cf53f9077e..f696c9fe984 100644
--- a/src/compiler/shader_enums.h
+++ b/src/compiler/shader_enums.h
@@ -1388,6 +1388,18 @@ u_reduced_prim(enum mesa_prim prim)
    }
 }
 
+static inline bool
+mesa_prim_has_adjacency(enum mesa_prim prim)
+{
+   static_assert(MESA_PRIM_LINE_STRIP_ADJACENCY == MESA_PRIM_LINES_ADJACENCY + 1, "");
+   static_assert(MESA_PRIM_TRIANGLES_ADJACENCY == MESA_PRIM_LINES_ADJACENCY + 2, "");
+   static_assert(MESA_PRIM_TRIANGLE_STRIP_ADJACENCY == MESA_PRIM_LINES_ADJACENCY + 3, "");
+
+   /* Adjacency primitives are together so we can do a simple comparison */
+   return prim >= MESA_PRIM_LINES_ADJACENCY &&
+          prim <= MESA_PRIM_TRIANGLE_STRIP_ADJACENCY;
+}
+
 /**
  * A compare function enum for use in compiler lowering passes.  This is in
  * the same order as GL's compare functions (shifted down by GL_NEVER), and is