[PATCH] Add HLE target feature

[darkbuck]

Hi nadav,

Add 'FeatureHLE' and auto-detection support

http://llvm-reviews.chandlerc.com/D437

Files:
  lib/Target/X86/X86.td
  lib/Target/X86/X86InstrInfo.td
  lib/Target/X86/X86Subtarget.cpp
  lib/Target/X86/X86Subtarget.h

Index: lib/Target/X86/X86.td
===================================================================
--- lib/Target/X86/X86.td
+++ lib/Target/X86/X86.td
@@ -120,6 +120,8 @@
                                       "Support BMI2 instructions">;
 def FeatureRTM     : SubtargetFeature<"rtm", "HasRTM", "true",
                                       "Support RTM instructions">;
+def FeatureHLE     : SubtargetFeature<"hle", "HasHLE", "true",
+                                      "Support HLE">;
 def FeatureADX     : SubtargetFeature<"adx", "HasADX", "true",
                                       "Support ADX instructions">;
 def FeatureLeaForSP : SubtargetFeature<"lea-sp", "UseLeaForSP", "true",
@@ -201,7 +203,7 @@
                                FeatureRDRAND, FeatureF16C, FeatureFSGSBase,
                                FeatureMOVBE, FeatureLZCNT, FeatureBMI,
                                FeatureBMI2, FeatureFMA,
-                               FeatureRTM]>;
+                               FeatureRTM, FeatureHLE]>;
 
 def : Proc<"k6",              [FeatureMMX]>;
 def : Proc<"k6-2",            [Feature3DNow]>;
Index: lib/Target/X86/X86InstrInfo.td
===================================================================
--- lib/Target/X86/X86InstrInfo.td
+++ lib/Target/X86/X86InstrInfo.td
@@ -603,6 +603,7 @@
 def HasBMI       : Predicate<"Subtarget->hasBMI()">;
 def HasBMI2      : Predicate<"Subtarget->hasBMI2()">;
 def HasRTM       : Predicate<"Subtarget->hasRTM()">;
+def HasHLE       : Predicate<"Subtarget->hasHLE()">;
 def HasADX       : Predicate<"Subtarget->hasADX()">;
 def FPStackf32   : Predicate<"!Subtarget->hasSSE1()">;
 def FPStackf64   : Predicate<"!Subtarget->hasSSE2()">;
Index: lib/Target/X86/X86Subtarget.cpp
===================================================================
--- lib/Target/X86/X86Subtarget.cpp
+++ lib/Target/X86/X86Subtarget.cpp
@@ -310,6 +310,10 @@
         HasBMI = true;
         ToggleFeature(X86::FeatureBMI);
       }
+      if ((EBX >> 4) & 0x1) {
+        HasHLE = true;
+        ToggleFeature(X86::FeatureHLE);
+      }
       if (IsIntel && ((EBX >> 5) & 0x1)) {
         X86SSELevel = AVX2;
         ToggleFeature(X86::FeatureAVX2);
@@ -439,6 +443,7 @@
   HasBMI = false;
   HasBMI2 = false;
   HasRTM = false;
+  HasHLE = false;
   HasADX = false;
   IsBTMemSlow = false;
   IsUAMemFast = false;
Index: lib/Target/X86/X86Subtarget.h
===================================================================
--- lib/Target/X86/X86Subtarget.h
+++ lib/Target/X86/X86Subtarget.h
@@ -121,6 +121,9 @@
   /// HasRTM - Processor has RTM instructions.
   bool HasRTM;
 
+  /// HasHLE - Processor has HLE.
+  bool HasHLE;
+
   /// HasADX - Processor has ADX instructions.
   bool HasADX;
 
@@ -253,6 +256,7 @@
   bool hasBMI() const { return HasBMI; }
   bool hasBMI2() const { return HasBMI2; }
   bool hasRTM() const { return HasRTM; }
+  bool hasHLE() const { return HasHLE; }
   bool hasADX() const { return HasADX; }
   bool isBTMemSlow() const { return IsBTMemSlow; }
   bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
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