tilelink2 Atomics: optimize the sign-extension circuit

2016-09-22 15:13:35 -07:00
parent 9f1f6fc61f
commit a3e88fa13a
2 changed files with 17 additions and 13 deletions
--- a/src/main/scala/uncore/tilelink2/package.scala
+++ b/src/main/scala/uncore/tilelink2/package.scala
@ -13,7 +13,7 @@ package object tilelink2
  def highOR(x: UInt) = {
    val w = x.getWidth
    def helper(s: Int, x: UInt): UInt =
-      if (s >= w) x else helper(s+s, x | x << s)
+      if (s >= w) x else helper(s+s, x | (x << s)(w-1,0))
    helper(1, x)
  }