From 31a9d13f5a8e91935777277d8e6e7187722301cd Mon Sep 17 00:00:00 2001
From: Jack Koenig <koenig@sifive.com>
Date: Tue, 9 Apr 2024 14:49:23 -0700
Subject: [PATCH] Fix === for abstract Reset types (#3979)

Previously, the function would infinitely recurse resulting in a stack
overflow.

(cherry picked from commit ea2d1036588ca63024085f5891cbcfdfc0faf7b0)
---
 core/src/main/scala/chisel3/Data.scala            | 2 +-
 src/test/scala/chiselTests/DataEqualitySpec.scala | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/core/src/main/scala/chisel3/Data.scala b/core/src/main/scala/chisel3/Data.scala
index d741f30ade3..e20aa40ba0b 100644
--- a/core/src/main/scala/chisel3/Data.scala
+++ b/core/src/main/scala/chisel3/Data.scala
@@ -915,7 +915,7 @@ object Data {
         case (thiz: UInt, that: UInt) => thiz === that
         case (thiz: SInt, that: SInt) => thiz === that
         case (thiz: AsyncReset, that: AsyncReset) => thiz.asBool === that.asBool
-        case (thiz: Reset, that: Reset) => thiz === that
+        case (thiz: Reset, that: Reset) => thiz.asBool === that.asBool
         case (thiz: EnumType, that: EnumType) => thiz === that
         case (thiz: Clock, that: Clock) => thiz.asUInt === that.asUInt
         case (thiz: Vec[_], that: Vec[_]) =>
diff --git a/src/test/scala/chiselTests/DataEqualitySpec.scala b/src/test/scala/chiselTests/DataEqualitySpec.scala
index 34b14e3ca01..19ec437b2ef 100644
--- a/src/test/scala/chiselTests/DataEqualitySpec.scala
+++ b/src/test/scala/chiselTests/DataEqualitySpec.scala
@@ -109,6 +109,11 @@ class DataEqualitySpec extends ChiselFlatSpec with Utils {
       new EqualityTester(true.B, false.B)
     }
   }
+  it should "support abstract reset wires" in {
+    assertTesterPasses {
+      new EqualityTester(WireDefault(Reset(), true.B), WireDefault(Reset(), true.B))
+    }
+  }
 
   behavior.of("AsyncReset === AsyncReset")
   it should "pass with equal values" in {