[PATCH] D38262: [AArch64] Use LateSimplifyCFG after expanding atomic operations.

[Balaram Makam via Phabricator via llvm-commits]

bmakam created this revision.
Herald added subscribers: kristof.beyls, javed.absar, rengolin, aemerson.

After r308422 we defer optimizations that can destroy loop canonical forms to
LateSimplifyCFG. Running LateSimplifyCFG after expanding atomic operations
can exploit more control-flow opportunities.


https://reviews.llvm.org/D38262

Files:
  lib/Target/AArch64/AArch64TargetMachine.cpp
  test/CodeGen/AArch64/aarch64-loop-gep-opt.ll


Index: test/CodeGen/AArch64/aarch64-loop-gep-opt.ll
===================================================================
--- test/CodeGen/AArch64/aarch64-loop-gep-opt.ll
+++ test/CodeGen/AArch64/aarch64-loop-gep-opt.ll
@@ -19,9 +19,9 @@
 
 do.body.i:
 ; CHECK-LABEL: do.body.i:
-; CHECK:          %uglygep1 = getelementptr i8, i8* %uglygep, i64 %3
-; CHECK-NEXT:     %4 = bitcast i8* %uglygep1 to i32*
-; CHECK-NOT:      %uglygep1 = getelementptr i8, i8* %uglygep, i64 1032
+; CHECK:          %uglygep2 = getelementptr i8, i8* %uglygep, i64 %3
+; CHECK-NEXT:     %4 = bitcast i8* %uglygep2 to i32*
+; CHECK-NOT:      %uglygep2 = getelementptr i8, i8* %uglygep, i64 1032
 
 
   %0 = phi i32 [ 256, %entry ], [ %.be, %do.body.i.backedge ]
Index: lib/Target/AArch64/AArch64TargetMachine.cpp
===================================================================
--- lib/Target/AArch64/AArch64TargetMachine.cpp
+++ lib/Target/AArch64/AArch64TargetMachine.cpp
@@ -365,7 +365,7 @@
   // determine whether it succeeded. We can exploit existing control-flow in
   // ldrex/strex loops to simplify this, but it needs tidying up.
   if (TM->getOptLevel() != CodeGenOpt::None && EnableAtomicTidy)
-    addPass(createCFGSimplificationPass());
+    addPass(createLateCFGSimplificationPass());
 
   // Run LoopDataPrefetch
   //


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