diff --git a/src/main/scala/gemmini/AccumulatorScale.scala b/src/main/scala/gemmini/AccumulatorScale.scala
index ab3c53d0..f93275d6 100644
--- a/src/main/scala/gemmini/AccumulatorScale.scala
+++ b/src/main/scala/gemmini/AccumulatorScale.scala
@@ -386,7 +386,6 @@ object AccumulatorScale {
   }
 
   def iexp[T <: Data](q: T, qln2: T, qln2_inv: T, qb: T, qc: T)(implicit ev: Arithmetic[T]): T = {
-    /*
     import ev._
 
     val zero = q.zero
@@ -403,18 +402,6 @@ object AccumulatorScale {
     val q_poly_iexp = qc.mac(qp_iexp + qb, qp_iexp + qb).withWidthOf(q)
     // we dont want a rounding shift
     //  TODO: z overflow
-    (q_poly_iexp.asUInt.do_>>(z_iexp_saturated.asUInt)).asTypeOf(q) */
-    import ev._
-
-    val zero = q.zero
-    val one = q.identity
-    def neg(x: T) = zero-x
-
-    val q_sign = Mux(q.zero > q, neg(one), one)
-    val q_abs = Mux(q.zero > q, neg(q), q)
-    val q_clipped = Mux(q_abs > neg(qb), neg(qb), q_abs)
-    val q_poly = qc.mac(q_clipped + qb, q_clipped + qb).withWidthOf(q)
-    val q_erf = (q_sign * q_poly).withWidthOf(q)
-    (q * (q_erf + qc)).withWidthOf(q)
+    (q_poly_iexp.asUInt.do_>>(z_iexp_saturated.asUInt)).asTypeOf(q)
   }}