From ee7538a3e912b20bf295cdfce81a531fafb0bb7c Mon Sep 17 00:00:00 2001
From: "Alon Zakai (kripken)" <alonzakai@gmail.com>
Date: Sun, 9 Jul 2017 20:39:12 -0700
Subject: don't remove unreachable nodes in vaccuum, it can alter types, and
 dce does that anyhow, let it do it's thing

---
 src/passes/Vacuum.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src')

diff --git a/src/passes/Vacuum.cpp b/src/passes/Vacuum.cpp
index 4e47ad9a3..64c7f276a 100644
--- a/src/passes/Vacuum.cpp
+++ b/src/passes/Vacuum.cpp
@@ -49,6 +49,8 @@ struct Vacuum : public WalkerPass<PostWalker<Vacuum>> {
 
   // returns nullptr if curr is dead, curr if it must stay as is, or another node if it can be replaced
   Expression* optimize(Expression* curr, bool resultUsed) {
+    // an unreachable node must not be changed
+    if (curr->type == unreachable) return curr;
     while (1) {
       switch (curr->_id) {
         case Expression::Id::NopId: return nullptr; // never needed
-- 
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