Remove the InstructionSimplifierPass immediately after InstructionCombiningPass.

InstructionCombiningPass was added after LoopUnrollPass in r237395. Because
InstructionCombiningPass is strictly more powerful than InstructionSimplifierPass,
remove the unnecessary InstructionSimplifierPass.

Differential Revision: http://reviews.llvm.org/D9838

llvm-svn: 237702

1 files changed, 0 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 3b21d3f0cb1..3496a663f53 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -385,10 +385,6 @@ void PassManagerBuilder::populateModulePassManager(
     // LoopUnroll may generate some redundency to cleanup.
     MPM.add(createInstructionCombiningPass());
 
-    // This is a barrier pass to avoid combine LICM pass and loop unroll pass
-    // within same loop pass manager.
-    MPM.add(createInstructionSimplifierPass());
-
     // Runtime unrolling will introduce runtime check in loop prologue. If the
     // unrolled loop is a inner loop, then the prologue will be inside the
     // outer loop. LICM pass can help to promote the runtime check out if the