From 0f8da915f790c6fedc3dee4b5c140103b454ab4d Mon Sep 17 00:00:00 2001
From: Artur Gainullin <artur.gainullin@intel.com>
Date: Wed, 16 Sep 2020 23:12:09 -0700
Subject: [PATCH] [SYCL] Didsable dead store elimination in early optimizations

Dead store elimination in early optimizations causes fail on GPU target
for some cases.
---
 llvm/lib/Transforms/IPO/PassManagerBuilder.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 50e87f0ab684f..f61a6b01a1b75 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -472,7 +472,8 @@ void PassManagerBuilder::addFunctionSimplificationPasses(
   if (OptLevel > 1) {
     MPM.add(createJumpThreadingPass());         // Thread jumps
     MPM.add(createCorrelatedValuePropagationPass());
-    MPM.add(createDeadStoreEliminationPass());  // Delete dead stores
+    if (!SYCLOptimizationMode)
+      MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
     MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap));
   }