[PATCH] D25962: [EarlyCSE] Enable MemorySSA for middle-end run of EarlyCSE.

[Geoff Berry via llvm-commits]

gberry created this revision.
gberry added a reviewer: dberlin.
gberry added subscribers: llvm-commits, mcrosier.
Herald added a subscriber: mehdi_amini.

Use MemorySSA for memory dependency checking in EarlyCSE pass at the
start of addFunctionSimplificationPasses at https://reviews.llvm.org/owners/package/2/ and higher.


https://reviews.llvm.org/D25962

Files:
  lib/Transforms/IPO/PassManagerBuilder.cpp


Index: lib/Transforms/IPO/PassManagerBuilder.cpp
===================================================================
--- lib/Transforms/IPO/PassManagerBuilder.cpp
+++ lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -294,7 +294,8 @@
   // Start of function pass.
   // Break up aggregate allocas, using SSAUpdater.
   MPM.add(createSROAPass());
-  MPM.add(createEarlyCSEPass());              // Catch trivial redundancies
+  bool UseMemorySSA = OptLevel > 1;
+  MPM.add(createEarlyCSEPass(UseMemorySSA));  // Catch trivial redundancies
   // Speculative execution if the target has divergent branches; otherwise nop.
   MPM.add(createSpeculativeExecutionIfHasBranchDivergencePass());
   MPM.add(createJumpThreadingPass());         // Thread jumps.


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