From 4cccd877c25116a1f0b90824aabfc689d7fe50ea Mon Sep 17 00:00:00 2001
From: Wesley W. Terpstra
Date: Mon, 18 Jun 2018 19:40:17 +0200
Subject: Fixed UIntToOH(x, 1) invocation with x.width == 0 (#778)

---
 src/test/scala/chiselTests/OneHotMuxSpec.scala | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'src/test')

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()
 }
+
-- 
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