X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FARM%2FARMSubtarget.cpp;h=704cf7abfb387bed4ce0bbcf2927b4b71230d6d7;hb=471850ab84301dd47cab2bf8d694fcb5766c1169;hp=7379f1c39d8970a856f5af735ea36d00cea493d7;hpb=41a024385f1220eadc48b48cb4c044a5fbc1b361;p=oota-llvm.git

diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 7379f1c39d8..704cf7abfb3 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -13,19 +13,32 @@
 
 #include "ARMSubtarget.h"
 #include "ARMGenSubtarget.inc"
-#include "llvm/Module.h"
+#include "llvm/GlobalValue.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Support/CommandLine.h"
 using namespace llvm;
 
-ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS, bool thumb)
+static cl::opt<bool>
+ReserveR9("arm-reserve-r9", cl::Hidden,
+          cl::desc("Reserve R9, making it unavailable as GPR"));
+
+ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
+                           bool isThumb)
   : ARMArchVersion(V4T)
-  , HasVFP2(false)
-  , IsThumb(thumb)
-  , UseThumbBacktraces(false)
-  , IsR9Reserved(false)
+  , ARMFPUType(None)
+  , UseNEONForSinglePrecisionFP(false)
+  , IsThumb(isThumb)
+  , ThumbMode(Thumb1)
+  , PostRAScheduler(false)
+  , IsR9Reserved(ReserveR9)
   , stackAlignment(4)
   , CPUString("generic")
   , TargetType(isELF) // Default to ELF unless otherwise specified.
   , TargetABI(ARM_ABI_APCS) {
+  // default to soft float ABI
+  if (FloatABIType == FloatABI::Default)
+    FloatABIType = FloatABI::Soft;
+
   // Determine default and user specified characteristics
 
   // Parse features string.
@@ -33,12 +46,12 @@ ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS, bool thumb)
 
   // Set the boolean corresponding to the current target triple, or the default
   // if one cannot be determined, to true.
-  const std::string& TT = M.getTargetTriple();
   unsigned Len = TT.length();
   unsigned Idx = 0;
+
   if (Len >= 5 && TT.substr(0, 4) == "armv")
     Idx = 4;
-  else if (Len >= 6 && TT.substr(0, 6) == "thumb") {
+  else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
     IsThumb = true;
     if (Len >= 7 && TT[5] == 'v')
       Idx = 6;
@@ -46,24 +59,30 @@ ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS, bool thumb)
   if (Idx) {
     unsigned SubVer = TT[Idx];
     if (SubVer > '4' && SubVer <= '9') {
-      if (SubVer >= '6')
+      if (SubVer >= '7') {
+        ARMArchVersion = V7A;
+      } else if (SubVer == '6') {
         ARMArchVersion = V6;
-      else if (SubVer == '5') {
+        if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
+          ARMArchVersion = V6T2;
+      } else if (SubVer == '5') {
         ARMArchVersion = V5T;
         if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
           ARMArchVersion = V5TE;
       }
+      if (ARMArchVersion >= V6T2)
+        ThumbMode = Thumb2;
     }
   }
 
+  // Thumb2 implies at least V6T2.
+  if (ARMArchVersion < V6T2 && ThumbMode >= Thumb2)
+    ARMArchVersion = V6T2;
+
   if (Len >= 10) {
     if (TT.find("-darwin") != std::string::npos)
       // arm-darwin
       TargetType = isDarwin;
-  } else if (TT.empty()) {
-#if defined(__APPLE__)
-    TargetType = isDarwin;
-#endif
   }
 
   if (TT.find("eabi") != std::string::npos)
@@ -72,8 +91,61 @@ ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS, bool thumb)
   if (isAAPCS_ABI())
     stackAlignment = 8;
 
-  if (isTargetDarwin()) {
-    UseThumbBacktraces = true;
-    IsR9Reserved = true;
+  if (isTargetDarwin())
+    IsR9Reserved = ReserveR9 | (ARMArchVersion < V6);
+
+  // Set CPU specific features.
+  if (CPUString == "cortex-a8") {
+    PostRAScheduler = true;
   }
 }
+
+/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol.
+bool
+ARMSubtarget::GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) const {
+  if (RelocM == Reloc::Static)
+    return false;
+
+  // GV with ghost linkage (in JIT lazy compilation mode) do not require an
+  // extra load from stub.
+  bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode();
+
+  if (!isTargetDarwin()) {
+    // Extra load is needed for all externally visible.
+    if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
+      return false;
+    return true;
+  } else {
+    if (RelocM == Reloc::PIC_) {
+      // If this is a strong reference to a definition, it is definitely not
+      // through a stub.
+      if (!isDecl && !GV->isWeakForLinker())
+        return false;
+
+      // Unless we have a symbol with hidden visibility, we have to go through a
+      // normal $non_lazy_ptr stub because this symbol might be resolved late.
+      if (!GV->hasHiddenVisibility())  // Non-hidden $non_lazy_ptr reference.
+        return true;
+
+      // If symbol visibility is hidden, we have a stub for common symbol
+      // references and external declarations.
+      if (isDecl || GV->hasCommonLinkage())
+        // Hidden $non_lazy_ptr reference.
+        return true;
+
+      return false;
+    } else {
+      // If this is a strong reference to a definition, it is definitely not
+      // through a stub.
+      if (!isDecl && !GV->isWeakForLinker())
+        return false;
+    
+      // Unless we have a symbol with hidden visibility, we have to go through a
+      // normal $non_lazy_ptr stub because this symbol might be resolved late.
+      if (!GV->hasHiddenVisibility())  // Non-hidden $non_lazy_ptr reference.
+        return true;
+    }
+  }
+
+  return false;
+}