From 678de4f7098c091dcca36b28149ef081880745f5 Mon Sep 17 00:00:00 2001
From: Dmitry Sidorov <dmitry.sidorov@intel.com>
Date: Fri, 25 Sep 2020 03:28:38 +0300
Subject: [PATCH] [SYCL] Disable simple unrolling alone

Signed-off-by: Dmitry Sidorov <dmitry.sidorov@intel.com>
---
 llvm/lib/Transforms/IPO/PassManagerBuilder.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 50e87f0ab684..25c4a4d31cec 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -446,9 +446,11 @@ void PassManagerBuilder::addFunctionSimplificationPasses(
   if (EnableLoopInterchange)
     MPM.add(createLoopInterchangePass()); // Interchange loops
 
-  // Unroll small loops
-  MPM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops,
-                                     ForgetAllSCEVInLoopUnroll));
+  // Don't perform unrolling for SPIR target
+  if (!SYCLOptimizationMode)
+    // Unroll small loops
+    MPM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops,
+                                       ForgetAllSCEVInLoopUnroll));
   addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
   // This ends the loop pass pipelines.