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-rw-r--r--src/tools/wasm-reduce.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tools/wasm-reduce.cpp b/src/tools/wasm-reduce.cpp
index 6b19e6216..f31c11edd 100644
--- a/src/tools/wasm-reduce.cpp
+++ b/src/tools/wasm-reduce.cpp
@@ -236,6 +236,7 @@ struct Reducer : public WalkerPass<PostWalker<Reducer, UnifiedExpressionVisitor<
"-O1",
"-O2",
"-O3",
+ "-O4",
"--flatten -Os",
"--flatten -O3",
"--flatten --local-cse -Os",