Bugfix #513. Fix BPSet width inference in Chisel3 (#523)

* Bugfix #513. Needs better test case

* Improved test

1 files changed, 5 insertions, 0 deletions

diff --git a/src/test/scala/chiselTests/FixedPointSpec.scala b/src/test/scala/chiselTests/FixedPointSpec.scala
index 0f5b3e9e..85f20d97 100644
--- a/src/test/scala/chiselTests/FixedPointSpec.scala
+++ b/src/test/scala/chiselTests/FixedPointSpec.scala
@@ -85,12 +85,17 @@ class SBP extends Module {
   })
   io.out := io.in.setBinaryPoint(0)
 }
+
 class SBPTester extends BasicTester {
   val dut = Module(new SBP)
   dut.io.in := 3.75.F(2.BP)
 
   assert(dut.io.out === 3.0.F(0.BP))
 
+  val test = Wire(FixedPoint(10.W, 5.BP))
+  val q = test.setBinaryPoint(18)
+  assert(q.getWidth.U === 23.U)
+
   stop()
 }