[Beignet] [PATCH] Set the loop unroll's threshold to 1024.

[Yang Rong]

LLVM's default threshold is 150, too small. In general, the loop unroll
in GEN can improve the perfomance, so enlarge it to 1024.

Signed-off-by: Yang Rong <rong.r.yang at intel.com>
---
 backend/src/llvm/llvm_to_gen.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/src/llvm/llvm_to_gen.cpp b/backend/src/llvm/llvm_to_gen.cpp
index e0f6bf2..891f2a1 100644
--- a/backend/src/llvm/llvm_to_gen.cpp
+++ b/backend/src/llvm/llvm_to_gen.cpp
@@ -160,7 +160,7 @@ namespace gbe
     MPM.add(createIndVarSimplifyPass());        // Canonicalize indvars
     MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
     MPM.add(createLoopDeletionPass());          // Delete dead loops
-    MPM.add(createLoopUnrollPass()); //1024, 32, 1024, 512)); //Unroll loops
+    MPM.add(createLoopUnrollPass(1024)); //1024, 32, 1024, 512)); //Unroll loops
     if(optLevel > 0) {
       MPM.add(createSROAPass(/*RequiresDomTree*/ false));
       MPM.add(createGVNPass());                 // Remove redundancies
-- 
1.8.3.2