1 files changed, 11 insertions, 3 deletions
diff --git a/src/passes/SimplifyGlobals.cpp b/src/passes/SimplifyGlobals.cpp
index 0943c04fe..be7cc6ca1 100644
--- a/src/passes/SimplifyGlobals.cpp
+++ b/src/passes/SimplifyGlobals.cpp
@@ -123,11 +123,19 @@ struct GlobalUseScanner : public WalkerPass<PostWalker<GlobalUseScanner>> {
     // See if reading a specific global is the only effect the first has.
     EffectAnalyzer firstEffects(getPassOptions(), *getModule(), first);
 
-    if (firstEffects.globalsRead.size() != 1) {
+    if (firstEffects.immutableGlobalsRead.size() +
+          firstEffects.mutableGlobalsRead.size() !=
+        1) {
       return Name();
     }
-    auto global = *firstEffects.globalsRead.begin();
-    firstEffects.globalsRead.clear();
+    Name global;
+    if (firstEffects.immutableGlobalsRead.size() == 1) {
+      global = *firstEffects.immutableGlobalsRead.begin();
+      firstEffects.immutableGlobalsRead.clear();
+    } else {
+      global = *firstEffects.mutableGlobalsRead.begin();
+      firstEffects.mutableGlobalsRead.clear();
+    }
     if (firstEffects.hasAnything()) {
       return Name();
     }