[PATCH] D13044: AMDGPU: Disable some passes that are not meaningful

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added a subscriber: arsenm.

Don't run passes related to stack maps, garbage collection,
exceptions since these aren't useful for GPUs.
    
There might be a few more to turn off that I'm less sure about
(e.g. ShrinkWrapping) or I'm not sure how to disable
(SafeStack and StackProtector)


http://reviews.llvm.org/D13044

Files:
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

Index: lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -126,8 +126,9 @@
 
   void addIRPasses() override;
   void addCodeGenPrepare() override;
-  virtual bool addPreISel() override;
-  virtual bool addInstSelector() override;
+  bool addPreISel() override;
+  bool addInstSelector() override;
+  bool addGCPasses() override;
 };
 
 class R600PassConfig : public AMDGPUPassConfig {
@@ -200,6 +201,11 @@
   return false;
 }
 
+bool AMDGPUPassConfig::addGCPasses() {
+  // Do nothing. GC is not supported.
+  return false;
+}
+
 //===----------------------------------------------------------------------===//
 // R600 Pass Setup
 //===----------------------------------------------------------------------===//
@@ -290,6 +296,11 @@
 void GCNPassConfig::addPreEmitPass() {
   addPass(createSIInsertWaits(*TM), false);
   addPass(createSILowerControlFlowPass(*TM), false);
+
+  // Exceptions and StackMaps are not supported, so these passes will never do
+  // anything.
+  disablePass(&StackMapLivenessID);
+  disablePass(&FuncletLayoutID);
 }
 
 TargetPassConfig *GCNTargetMachine::createPassConfig(PassManagerBase &PM) {


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