AMDGPU: Remove disable-irstructurizer subtarget feature

The only real reason to use it is for testing, so replace
it with a command line option instead of a potentially function
dependent feature.

llvm-svn: 273653

llvm/lib/Target/AMDGPU/AMDGPU.td

@@ -216,12 +216,6 @@ def FeatureDumpCodeLower : SubtargetFeature <"dumpcode",
   "Dump MachineInstrs in the CodeEmitter"
 >;
 
-def FeatureIRStructurizer : SubtargetFeature <"disable-irstructurizer",
-  "EnableIRStructurizer",
-  "false",
-  "Disable IR Structurizer"
->;
-
 def FeaturePromoteAlloca : SubtargetFeature <"promote-alloca",
   "EnablePromoteAlloca",
   "true",

llvm/lib/Target/AMDGPU/AMDGPUSubtarget.cpp

@@ -103,7 +103,6 @@ AMDGPUSubtarget::AMDGPUSubtarget(const Triple &TT, StringRef GPU, StringRef FS,
     DebuggerReserveRegs(false),
 
     EnableVGPRSpilling(false),
-    EnableIRStructurizer(true),
     EnablePromoteAlloca(false),
     EnableIfCvt(true),
     EnableLoadStoreOpt(false),

llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h

@@ -80,7 +80,6 @@ protected:
 
   // Used as options.
   bool EnableVGPRSpilling;
-  bool EnableIRStructurizer;
   bool EnablePromoteAlloca;
   bool EnableIfCvt;
   bool EnableLoadStoreOpt;
@@ -218,10 +217,6 @@ public:
     return CaymanISA;
   }
 
-  bool IsIRStructurizerEnabled() const {
-    return EnableIRStructurizer;
-  }
-
   bool isPromoteAllocaEnabled() const {
     return EnablePromoteAlloca;
   }

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -40,6 +40,11 @@
 
 using namespace llvm;
 
+static cl::opt<bool> EnableR600StructurizeCFG(
+  "r600-ir-structurize",
+  cl::desc("Use StructurizeCFG IR pass"),
+  cl::init(true));
+
 extern "C" void LLVMInitializeAMDGPUTarget() {
   // Register the target
   RegisterTargetMachine<R600TargetMachine> X(TheAMDGPUTarget);
@@ -326,8 +331,8 @@ bool AMDGPUPassConfig::addGCPasses() {
 
 bool R600PassConfig::addPreISel() {
   AMDGPUPassConfig::addPreISel();
-  const AMDGPUSubtarget &ST = *getAMDGPUTargetMachine().getSubtargetImpl();
-  if (ST.IsIRStructurizerEnabled())
+
+  if (EnableR600StructurizeCFG)
     addPass(createStructurizeCFGPass());
   addPass(createR600TextureIntrinsicsReplacer());
   return false;

llvm/test/CodeGen/AMDGPU/predicates.ll

@@ -1,4 +1,4 @@
-; RUN: llc -spec-exec-max-speculation-cost=0 -march=r600 -mattr=disable-irstructurizer -mcpu=redwood < %s | FileCheck %s
+; RUN: llc -spec-exec-max-speculation-cost=0 -march=r600 -r600-ir-structurize=0 -mcpu=redwood < %s | FileCheck %s
 
 ; These tests make sure the compiler is optimizing branches using predicates
 ; when it is legal to do so.

llvm/test/CodeGen/AMDGPU/structurize.ll

@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=r600 -mcpu=redwood -mattr=disable-irstructurizer | FileCheck %s
+; RUN: llc < %s -march=r600 -mcpu=redwood -r600-ir-structurize=0 | FileCheck %s
 ; Test case for a crash in the AMDILCFGStructurizer from a CFG like this:
 ;
 ;                            entry