From 1f655d71d9df4fc79545eba8667bdf24afa23792 Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olvaffe@gmail.com>
Date: Tue, 30 Apr 2024 11:12:48 -0700
Subject: [PATCH] Add EarlyCSEPass before InstCombinePass (#1339)

It prevents InstCombinePass from obfuscating MADs in some cases.
---
 lib/Compiler.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Compiler.cpp b/lib/Compiler.cpp
index 9345cec13..f1fe1e8db 100644
--- a/lib/Compiler.cpp
+++ b/lib/Compiler.cpp
@@ -39,6 +39,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/InstCombine/InstCombine.h"
 #include "llvm/Transforms/Scalar/DCE.h"
+#include "llvm/Transforms/Scalar/EarlyCSE.h"
 #include "llvm/Transforms/Scalar/InferAddressSpaces.h"
 #include "llvm/Transforms/Scalar/SROA.h"
 #include "llvm/Transforms/Scalar/StructurizeCFG.h"
@@ -590,6 +591,7 @@ int RunPassPipeline(llvm::Module &M, llvm::raw_svector_ostream *binaryStream) {
     // See https://github.com/google/clspv/issues/71
     pm.addPass(clspv::HideConstantLoadsPass());
 
+    pm.addPass(llvm::createModuleToFunctionPassAdaptor(llvm::EarlyCSEPass()));
     pm.addPass(
         llvm::createModuleToFunctionPassAdaptor(llvm::InstCombinePass()));