From 6ccff4848fcf55cb1e865738a67f2bec25988ac8 Mon Sep 17 00:00:00 2001
From: Jiuyang Liu
Date: Wed, 26 May 2021 02:35:34 +0800
Subject: throw exception if BitPat width is 0  (#1920)

* spot a bug when BitPat width is 0

* fix #1919

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>---
 src/main/scala/chisel3/util/BitPat.scala | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/main/scala/chisel3')

diff --git a/src/main/scala/chisel3/util/BitPat.scala b/src/main/scala/chisel3/util/BitPat.scala
index 88e46e3c..985d22da 100644
--- a/src/main/scala/chisel3/util/BitPat.scala
+++ b/src/main/scala/chisel3/util/BitPat.scala
@@ -23,6 +23,7 @@ object BitPat {
     // If ? parsing is to be exposed, the return API needs further scrutiny
     // (especially with things like mask polarity).
     require(x.head == 'b', "BitPats must be in binary and be prefixed with 'b'")
+    require(x.length > 1, "BitPat width cannot be 0.")
     var bits = BigInt(0)
     var mask = BigInt(0)
     var count = 0
-- 
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