From 8f987f2b78556387937693276dd30f2c88a713f3 Mon Sep 17 00:00:00 2001
From: yuliujq <47776208+yuliujq@users.noreply.github.com>
Date: Sat, 4 Jan 2020 14:29:37 +0800
Subject: [PATCH 1/2] 'fskip' will not always return false

fskip returns false at the end of PackedFunc, discards return true in 'cast' case
---
 src/relay/backend/build_module.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/relay/backend/build_module.cc b/src/relay/backend/build_module.cc
index 102e4c299774..1b5c33c0d9aa 100644
--- a/src/relay/backend/build_module.cc
+++ b/src/relay/backend/build_module.cc
@@ -327,8 +327,9 @@ class RelayBuildModule : public runtime::ModuleNode {
             *rv = true;
           }
         }
+      } else {
+        *rv = false;
       }
-      *rv = false;
     });
     pass_seqs.push_back(transform::EliminateCommonSubexpr(fskip));
     pass_seqs.push_back(transform::CombineParallelConv2D(3));

From ba8291001757931a53126375d0ce6de95625240d Mon Sep 17 00:00:00 2001
From: yuliujq <47776208+yuliujq@users.noreply.github.com>
Date: Tue, 7 Jan 2020 17:28:12 +0800
Subject: [PATCH 2/2] Update build_module.cc

---
 src/relay/backend/build_module.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/relay/backend/build_module.cc b/src/relay/backend/build_module.cc
index 1b5c33c0d9aa..afb03d7ab105 100644
--- a/src/relay/backend/build_module.cc
+++ b/src/relay/backend/build_module.cc
@@ -318,6 +318,7 @@ class RelayBuildModule : public runtime::ModuleNode {
     pass_seqs.push_back(transform::SimplifyInference());
     PackedFunc fskip = PackedFunc([](TVMArgs args, TVMRetValue* rv) {
       Expr expr = args[0];
+      *rv = false;
       if (expr.as<CallNode>()) {
         auto call_node = expr.as<CallNode>();
         auto op_node = call_node->op.as<OpNode>();
@@ -327,8 +328,6 @@ class RelayBuildModule : public runtime::ModuleNode {
             *rv = true;
           }
         }
-      } else {
-        *rv = false;
       }
     });
     pass_seqs.push_back(transform::EliminateCommonSubexpr(fskip));