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((function inversesqrt
   (signature float
     (parameters
       (declare (in) float arg0))
     ((return (expression float rsq (var_ref arg0)))))

   (signature vec2
     (parameters
       (declare (in) vec2 arg0))
     ((return (expression vec2 rsq (var_ref arg0)))))

   (signature vec3
     (parameters
       (declare (in) vec3 arg0))
     ((return (expression vec3 rsq (var_ref arg0)))))

   (signature vec4
     (parameters
       (declare (in) vec4 arg0))
     ((return (expression vec4 rsq (var_ref arg0)))))
))