Added a conditional readport example, with new idea of representing a read enable with muxing the index with poison bits

1 files changed, 25 insertions, 0 deletions

diff --git a/test/features/CondRead.fir b/test/features/CondRead.fir
new file mode 100644
index 00000000..8961715e
--- /dev/null
+++ b/test/features/CondRead.fir
@@ -0,0 +1,25 @@
+; RUN: firrtl -i %s -o %s.v -X verilog -p c 2>&1 | tee %s.out | FileCheck %s
+; XFAIL: *
+circuit CondRead :
+  module CondRead :
+    input pred : UInt<1>
+    input index : UInt<6>
+    input clk : Clock
+    output out : UInt<20>
+
+    smem mem : UInt<20>[128],clk
+    
+    poison xxx : UInt<20>
+    wire data : UInt<20>
+    data := xxx
+    when pred :
+      read accessor readport = mem[index]
+      data := readport
+    
+    out := data
+
+
+; CHECK: poison index_0 : UInt<6>
+; CHECK: read accessor readport = mem[mux(pred,index,index_0)]
+; CHECK: Done!
+