Correlate stubs with functions in JIT: when emitting a stub, the JIT tells the memory...

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

diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 6efe540fabd24ea7f503dfdad91e4b04cc3db3ce..610bf1da432b2b16053368326fad2141b6783ba1 100644 (file)
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -26,6 +26,10 @@ AsmWriterFlavor("x86-asm-syntax", cl::init(X86Subtarget::Unset),
     clEnumValN(X86Subtarget::Intel, "intel", "  Emit Intel-style assembly"),
     clEnumValEnd));
 
+cl::opt<unsigned>
+StackAlignment("stack-alignment", cl::init(0),
+               cl::desc("Override default stack alignment"));
+
 
 /// True if accessing the GV requires an extra load. For Windows, dllimported
 /// symbols are indirect, loading the value at address GV rather then the
@@ -36,22 +40,37 @@ bool X86Subtarget::GVRequiresExtraLoad(const GlobalValue* GV,
                                        bool isDirectCall) const
 {
   // FIXME: PIC
-  if (TM.getRelocationModel() != Reloc::Static)
+  if (TM.getRelocationModel() != Reloc::Static) {
     if (isTargetDarwin()) {
       return (!isDirectCall &&
               (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
                (GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode())));
-    } else if (TM.getRelocationModel() == Reloc::PIC_ && isPICStyleGOT()) {
+    } else if (isTargetELF()) {
       // Extra load is needed for all non-statics.
       return (!isDirectCall &&
               (GV->isDeclaration() || !GV->hasInternalLinkage()));
     } else if (isTargetCygMing() || isTargetWindows()) {
       return (GV->hasDLLImportLinkage());
     }
+  }
   
   return false;
 }
 
+/// 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 *X86Subtarget::getBZeroEntry() const {
+
+  // Darwin 10 has a __bzero entry point for this purpose.
+  if (getDarwinVers() >= 10)
+    return "__bzero";
+
+  return 0;
+}
+
 /// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the
 /// specified arguments.  If we can't run cpuid on the host, return true.
 bool X86::GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
@@ -114,6 +133,8 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
   if ((EDX >> 26) & 0x1) X86SSELevel = SSE2;
   if (ECX & 0x1)         X86SSELevel = SSE3;
   if ((ECX >> 9)  & 0x1) X86SSELevel = SSSE3;
+  if ((ECX >> 19) & 0x1) X86SSELevel = SSE41;
+  if ((ECX >> 20) & 0x1) X86SSELevel = SSE42;
 
   if (memcmp(text.c, "GenuineIntel", 12) == 0 ||
       memcmp(text.c, "AuthenticAMD", 12) == 0) {
@@ -220,13 +241,13 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
   : AsmFlavor(AsmWriterFlavor)
   , PICStyle(PICStyle::None)
   , X86SSELevel(NoMMXSSE)
+  , X863DNowLevel(NoThreeDNow)
   , HasX86_64(false)
   , DarwinVers(0)
   , stackAlignment(8)
   // FIXME: this is a known good value for Yonah. How about others?
   , MaxInlineSizeThreshold(128)
   , Is64Bit(is64Bit)
-  , HasLow4GUserAddress(true)
   , TargetType(isELF) { // Default to ELF unless otherwise specified.
 
   // Determine default and user specified characteristics
@@ -234,12 +255,6 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
     // If feature string is not empty, parse features string.
     std::string CPU = GetCurrentX86CPU();
     ParseSubtargetFeatures(FS, CPU);
-    
-    if (Is64Bit && !HasX86_64)
-      cerr << "Warning: Generation of 64-bit code for a 32-bit processor "
-           << "requested.\n";
-    if (Is64Bit && X86SSELevel < SSE2)
-      cerr << "Warning: 64-bit processors all have at least SSE2.\n";
   } else {
     // Otherwise, use CPUID to auto-detect feature set.
     AutoDetectSubtargetFeatures();
@@ -272,11 +287,13 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
       TargetType = isMingw;
     } else if (TT.find("win32") != std::string::npos) {
       TargetType = isWindows;
+    } else if (TT.find("windows") != std::string::npos) {
+      TargetType = isWindows;
     }
   } else if (TT.empty()) {
 #if defined(__CYGWIN__)
     TargetType = isCygwin;
-#elif defined(__MINGW32__)
+#elif defined(__MINGW32__) || defined(__MINGW64__)
     TargetType = isMingw;
 #elif defined(__APPLE__)
     TargetType = isDarwin;
@@ -286,7 +303,7 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
     DarwinVers = 8;  // Minimum supported darwin is Tiger.
 #endif
     
-#elif defined(_WIN32)
+#elif defined(_WIN32) || defined(_WIN64)
     TargetType = isWindows;
 #endif
   }
@@ -298,12 +315,13 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
       ? X86Subtarget::Intel : X86Subtarget::ATT;
   }
 
-  if (TargetType == isDarwin && Is64Bit)
-    HasLow4GUserAddress = false;
-
   if (TargetType == isDarwin ||
       TargetType == isCygwin ||
       TargetType == isMingw  ||
+      TargetType == isWindows ||
       (TargetType == isELF && Is64Bit))
     stackAlignment = 16;
+
+  if (StackAlignment)
+    stackAlignment = StackAlignment;
 }