R600: Add a SubtargetFeatture for disabling the ifcvt pass.

This is useful when writing test cases for the AMDIL structurizer.

llvm-svn: 195029

llvm/lib/Target/R600/AMDGPU.td

@@ -28,6 +28,11 @@ def FeatureIRStructurizer : SubtargetFeature <"enable-irstructurizer",
 
 // Target features
 
+def FeatureIfCvt : SubtargetFeature <"disable-ifcvt",
+        "EnableIfCvt",
+        "false",
+        "Disable the if conversion pass">;
+
 def FeatureFP64     : SubtargetFeature<"fp64",
         "FP64",
         "true",

llvm/lib/Target/R600/AMDGPUSubtarget.cpp

@@ -37,6 +37,7 @@ AMDGPUSubtarget::AMDGPUSubtarget(StringRef TT, StringRef CPU, StringRef FS) :
   FP64 = false;
   CaymanISA = false;
   EnableIRStructurizer = false;
+  EnableIfCvt = true;
   ParseSubtargetFeatures(GPU, FS);
   DevName = GPU;
 }
@@ -70,6 +71,10 @@ AMDGPUSubtarget::IsIRStructurizerEnabled() const {
   return EnableIRStructurizer;
 }
 bool
+AMDGPUSubtarget::isIfCvtEnabled() const {
+  return EnableIfCvt;
+}
+bool
 AMDGPUSubtarget::isTargetELF() const {
   return false;
 }

llvm/lib/Target/R600/AMDGPUSubtarget.h

@@ -50,6 +50,7 @@ private:
   bool FP64;
   bool CaymanISA;
   bool EnableIRStructurizer;
+  bool EnableIfCvt;
 
   InstrItineraryData InstrItins;
 
@@ -66,6 +67,7 @@ public:
   bool hasHWFP64() const;
   bool hasCaymanISA() const;
   bool IsIRStructurizerEnabled() const;
+  bool isIfCvtEnabled() const;
 
   virtual bool enableMachineScheduler() const {
     return getGeneration() <= NORTHERN_ISLANDS;

llvm/lib/Target/R600/AMDGPUTargetMachine.cpp

@@ -169,7 +169,8 @@ bool AMDGPUPassConfig::addPreSched2() {
 
   if (ST.getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS)
     addPass(createR600EmitClauseMarkers(*TM));
-  addPass(&IfConverterID);
+  if (ST.isIfCvtEnabled())
+    addPass(&IfConverterID);
   if (ST.getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS)
     addPass(createR600ClauseMergePass(*TM));
   return false;