[AArch64][GlobalISel] Add a post-legalizer combiner with a very simple combine.

[android-x86/external-llvm-project.git] / llvm / lib / Target / AArch64 / AArch64TargetMachine.cpp

diff --git a/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp b/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
index a971887..fe4dc8b 100644 (file)
--- a/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
@@ -183,6 +183,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64Target() {
   initializeAArch64LoadStoreOptPass(*PR);
   initializeAArch64SIMDInstrOptPass(*PR);
   initializeAArch64PreLegalizerCombinerPass(*PR);
+  initializeAArch64PostLegalizerCombinerPass(*PR);
   initializeAArch64PromoteConstantPass(*PR);
   initializeAArch64RedundantCopyEliminationPass(*PR);
   initializeAArch64StorePairSuppressPass(*PR);
@@ -410,6 +411,7 @@ public:
   bool addIRTranslator() override;
   void addPreLegalizeMachineIR() override;
   bool addLegalizeMachineIR() override;
+  void addPreRegBankSelect() override;
   bool addRegBankSelect() override;
   void addPreGlobalInstructionSelect() override;
   bool addGlobalInstructionSelect() override;
@@ -552,6 +554,14 @@ bool AArch64PassConfig::addLegalizeMachineIR() {
   return false;
 }
 
+void AArch64PassConfig::addPreRegBankSelect() {
+  // For now we don't add this to the pipeline for -O0. We could do in future
+  // if we split the combines into separate O0/opt groupings.
+  bool IsOptNone = getOptLevel() == CodeGenOpt::None;
+  if (!IsOptNone)
+    addPass(createAArch64PostLegalizeCombiner(IsOptNone));
+}
+
 bool AArch64PassConfig::addRegBankSelect() {
   addPass(new RegBankSelect());
   return false;