From a7a5030d9af1b504fd373e5060f66a859cb972dc Mon Sep 17 00:00:00 2001
From: Jack Koenig
Date: Thu, 1 Oct 2020 19:47:12 -0700
Subject: Fix "fix" for negative literals > 32 bits

Overflow of 32-bit Int would cause any negative literal value equal to
-(2^(width % 32 - 1)) where width >= 32 to be incorrectly inverted
---
 .../scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/main')

diff --git a/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala b/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala
index 2ba28ebb..d1520eae 100644
--- a/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala
+++ b/src/main/scala/firrtl/transforms/FixAddingNegativeLiteralsTransform.scala
@@ -17,7 +17,7 @@ object FixAddingNegativeLiterals {
     * @param width width of the negative number
     * @return maximum negative number
     */
-  def minNegValue(width: BigInt): BigInt = -(1 << (width.toInt - 1))
+  def minNegValue(width: BigInt): BigInt = -(BigInt(1) << (width.toInt - 1))
 
   /** Updates the type of the DoPrim from its arguments (e.g. if is UnknownType)
     * @param d input DoPrim
-- 
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