Merge pull request #1065 from freechipsproject/dce-printf-stop

DCE printf and stop statements with constant-0 enables

1 files changed, 17 insertions, 0 deletions

diff --git a/src/test/scala/firrtlTests/DCETests.scala b/src/test/scala/firrtlTests/DCETests.scala
index a6def402..620cc5f3 100644
--- a/src/test/scala/firrtlTests/DCETests.scala
+++ b/src/test/scala/firrtlTests/DCETests.scala
@@ -449,6 +449,23 @@ class DCETests extends FirrtlFlatSpec {
     // Check for register update
     verilog should include regex ("""(?m)if \(a\) begin\n\s*r <= x;\s*end""")
   }
+
+  "Emitted Verilog" should "not contain dead print or stop statements" in {
+    val input = parse(
+      """circuit test :
+        |  module test :
+        |    input clock : Clock
+        |    when UInt<1>(0) :
+        |      printf(clock, UInt<1>(1), "o hai")
+        |      stop(clock, UInt<1>(1), 1)""".stripMargin
+    )
+
+    val state = CircuitState(input, ChirrtlForm)
+    val result = (new VerilogCompiler).compileAndEmit(state, List.empty)
+    val verilog = result.getEmittedCircuit.value
+    verilog shouldNot include regex ("""fwrite""")
+    verilog shouldNot include regex ("""fatal""")
+  }
 }
 
 class DCECommandLineSpec extends FirrtlFlatSpec {