Introduce a new technique for merging BasicBlock with Instruction sentinel by superpo...

[oota-llvm.git] / lib / Target / X86 / X86Subtarget.h

diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index ee193cf519ad5ad4d0102d8506d2bae31531a632..ded26e891e16c62e8f39eef0ff72b398a7c6d83b 100644 (file)
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -15,7 +15,6 @@
 #define X86SUBTARGET_H
 
 #include "llvm/Target/TargetSubtarget.h"
-
 #include <string>
 
 namespace llvm {
@@ -23,7 +22,7 @@ class Module;
 class GlobalValue;
 class TargetMachine;
   
-namespace PICStyle {
+namespace PICStyles {
 enum Style {
   Stub, GOT, RIPRel, WinPIC, None
 };
@@ -38,7 +37,7 @@ public:
   };
 protected:
   enum X86SSEEnum {
-    NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3
+    NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42
   };
 
   enum X863DNowEnum {
@@ -51,10 +50,10 @@ protected:
 
   /// PICStyle - Which PIC style to use
   ///
-  PICStyle::Style PICStyle;
+  PICStyles::Style PICStyle;
   
-  /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, or none supported.
-  ///
+  /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
+  /// none supported.
   X86SSEEnum X86SSELevel;
 
   /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
@@ -64,10 +63,16 @@ protected:
   /// HasX86_64 - True if the processor supports X86-64 instructions.
   ///
   bool HasX86_64;
+
+  /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
+  bool IsBTMemSlow;
   
   /// DarwinVers - Nonzero if this is a darwin platform: the numeric
   /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
-  unsigned char DarwinVers; // Is any darwin-ppc platform.
+  unsigned char DarwinVers; // Is any darwin-x86 platform.
+
+  /// isLinux - true if this is a "linux" platform.
+  bool IsLinux;
 
   /// stackAlignment - The minimum alignment known to hold of the stack frame on
   /// entry to the function and which must be maintained by every function.
@@ -82,10 +87,6 @@ private:
   /// pointer size is 64 bit.
   bool Is64Bit;
 
-  /// HasLow4GUserAddress - True if the low 4G user-space address is available.
-  ///
-  bool HasLow4GUserAddress;
-
 public:
   enum {
     isELF, isCygwin, isDarwin, isWindows, isMingw
@@ -115,21 +116,21 @@ public:
 
   bool is64Bit() const { return Is64Bit; }
 
-  /// hasLow4GUserSpaceAddress - True if lower 4G user-space address is
-  /// available.
-  bool hasLow4GUserSpaceAddress() const { return HasLow4GUserAddress; }
-
-  PICStyle::Style getPICStyle() const { return PICStyle; }
-  void setPICStyle(PICStyle::Style Style)  { PICStyle = Style; }
+  PICStyles::Style getPICStyle() const { return PICStyle; }
+  void setPICStyle(PICStyles::Style Style)  { PICStyle = Style; }
 
   bool hasMMX() const { return X86SSELevel >= MMX; }
   bool hasSSE1() const { return X86SSELevel >= SSE1; }
   bool hasSSE2() const { return X86SSELevel >= SSE2; }
   bool hasSSE3() const { return X86SSELevel >= SSE3; }
   bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
+  bool hasSSE41() const { return X86SSELevel >= SSE41; }
+  bool hasSSE42() const { return X86SSELevel >= SSE42; }
   bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
   bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
 
+  bool isBTMemSlow() const { return IsBTMemSlow; }
+
   unsigned getAsmFlavor() const {
     return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
   }
@@ -138,12 +139,17 @@ public:
   bool isFlavorIntel() const { return AsmFlavor == Intel; }
 
   bool isTargetDarwin() const { return TargetType == isDarwin; }
-  bool isTargetELF() const { return TargetType == isELF; }
+  bool isTargetELF() const {
+    return TargetType == isELF;
+  }
   bool isTargetWindows() const { return TargetType == isWindows; }
   bool isTargetMingw() const { return TargetType == isMingw; }
   bool isTargetCygMing() const { return (TargetType == isMingw ||
                                          TargetType == isCygwin); }
   bool isTargetCygwin() const { return TargetType == isCygwin; }
+  bool isTargetWin64() const {
+    return (Is64Bit && (TargetType == isMingw || TargetType == isWindows));
+  }
 
   std::string getDataLayout() const {
     const char *p;
@@ -158,15 +164,18 @@ public:
     return std::string(p);
   }
 
-  bool isPICStyleSet() const { return PICStyle != PICStyle::None; }
-  bool isPICStyleGOT() const { return PICStyle == PICStyle::GOT; }
-  bool isPICStyleStub() const { return PICStyle == PICStyle::Stub; }
-  bool isPICStyleRIPRel() const { return PICStyle == PICStyle::RIPRel; }
-  bool isPICStyleWinPIC() const { return PICStyle == PICStyle:: WinPIC; }
+  bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
+  bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
+  bool isPICStyleStub() const { return PICStyle == PICStyles::Stub; }
+  bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
+  bool isPICStyleWinPIC() const { return PICStyle == PICStyles:: WinPIC; }
   
   /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
   unsigned getDarwinVers() const { return DarwinVers; }
   
+  /// isLinux - Return true if the target is "Linux".
+  bool isLinux() const { return IsLinux; }
+
   /// True if accessing the GV requires an extra load. For Windows, dllimported
   /// symbols are indirect, loading the value at address GV rather then the
   /// value of GV itself. This means that the GlobalAddress must be in the base
@@ -174,6 +183,24 @@ public:
   bool GVRequiresExtraLoad(const GlobalValue* GV, const TargetMachine& TM,
                            bool isDirectCall) const;
 
+  /// True if accessing the GV requires a register.  This is a superset of the
+  /// cases where GVRequiresExtraLoad is true.  Some variations of PIC require
+  /// a register, but not an extra load.
+  bool GVRequiresRegister(const GlobalValue* GV, const TargetMachine& TM,
+                           bool isDirectCall) const;
+
+  /// This function returns the name of a function which has an interface
+  /// like the non-standard bzero function, if such a function exists on
+  /// the current subtarget and it is considered prefereable over
+  /// memset with zero passed as the second argument. Otherwise it
+  /// returns null.
+  const char *getBZeroEntry() const;
+
+  /// getSpecialAddressLatency - For targets where it is beneficial to
+  /// backschedule instructions that compute addresses, return a value
+  /// indicating the number of scheduling cycles of backscheduling that
+  /// should be attempted.
+  unsigned getSpecialAddressLatency() const;
 };
 
 namespace X86 {