Fixed UIntToOH(x, 1) invocation with x.width == 0 (#778)

1 files changed, 13 insertions, 1 deletions

diff --git a/src/test/scala/chiselTests/OneHotMuxSpec.scala b/src/test/scala/chiselTests/OneHotMuxSpec.scala
index e12d7913..be252bef 100644
--- a/src/test/scala/chiselTests/OneHotMuxSpec.scala
+++ b/src/test/scala/chiselTests/OneHotMuxSpec.scala
@@ -43,6 +43,14 @@ class OneHotMuxSpec extends FreeSpec with Matchers with ChiselRunners {
   "UIntToOH with output width greater than 2^(input width)" in {
     assertTesterPasses(new UIntToOHTester)
   }
+  "UIntToOH should not accept width of zero (until zero-width wires are fixed" in {
+    intercept[java.lang.IllegalArgumentException] {
+      assertTesterPasses(new BasicTester {
+        val out = UIntToOH(0.U, 0)
+      })
+    }
+  }
+
 }
 
 class SimpleOneHotTester extends BasicTester {
@@ -288,9 +296,13 @@ class DifferentBundleOneHotTester extends BasicTester {
 
 class UIntToOHTester extends BasicTester {
   val out = UIntToOH(1.U, 3)
-
   require(out.getWidth == 3)
   assert(out === 2.U)
 
+  val out2 = UIntToOH(0.U, 1)
+  require(out2.getWidth == 1)
+  assert(out2 === 1.U)
+
   stop()
 }
+