Decouple fsqrt from gpul optimizations, implementing fsqrt.ll.

Remove the -enable-gpopt option which is subsumed by feature flags.

llvm-svn: 23218

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

@@ -54,7 +54,7 @@ PPC32TargetLowering::PPC32TargetLowering(TargetMachine &TM)
   setOperationAction(ISD::SREM , MVT::f32, Expand);
   
   // If we're enabling GP optimizations, use hardware square root
-  if (!TM.getSubtarget<PPCSubtarget>().isGigaProcessor()) {
+  if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
     setOperationAction(ISD::FSQRT, MVT::f64, Expand);
     setOperationAction(ISD::FSQRT, MVT::f32, Expand);
   }

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

@@ -25,11 +25,10 @@ namespace llvm {
   PPCTargetArg(cl::desc("Force generation of code for a specific PPC target:"),
                cl::values(
                           clEnumValN(TargetAIX,  "aix", "  Enable AIX codegen"),
-                          clEnumValN(TargetDarwin,"darwin","  Enable Darwin codegen"),
+                          clEnumValN(TargetDarwin,"darwin",
+                                     "  Enable Darwin codegen"),
                           clEnumValEnd),
                cl::location(PPCTarget), cl::init(TargetDefault));
-  cl::opt<bool> EnableGPOPT("enable-gpopt", cl::Hidden,
-                             cl::desc("Enable optimizations for GP cpus"));
 }
 
 enum PowerPCFeature {
@@ -126,7 +125,8 @@ PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
   SubtargetFeatures::Parse(FS, CPU,
                            PowerPCSubTypeKV, PowerPCSubTypeKVSize,
                            PowerPCFeatureKV, PowerPCFeatureKVSize);
-  IsGigaProcessor = (Bits & PowerPCFeatureGPUL) != 0;
+  IsGigaProcessor = (Bits & PowerPCFeatureGPUL ) != 0;
+  HasFSQRT        = (Bits & PowerPCFeatureFSqrt) != 0;
 
   // Set the boolean corresponding to the current target triple, or the default
   // if one cannot be determined, to true.
@@ -140,7 +140,4 @@ PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
     IsDarwin = true;
 #endif
   }
-  
-  // If GP opts are forced on by the commandline, do so now.
-  if (EnableGPOPT) IsGigaProcessor = true;
 }

llvm/lib/Target/PowerPC/PPCSubtarget.h

@@ -29,6 +29,7 @@ protected:
 
   /// Used by the ISel to turn in optimizations for POWER4-derived architectures
   bool IsGigaProcessor;
+  bool HasFSQRT;
   bool IsAIX;
   bool IsDarwin;
 public:
@@ -42,6 +43,8 @@ public:
   /// function for this subtarget.
   unsigned getStackAlignment() const { return StackAlignment; }
 
+  bool hasFSQRT() const { return HasFSQRT; }
+  
   bool isAIX() const { return IsAIX; }
   bool isDarwin() const { return IsDarwin; }