Restore the -post-RA-scheduler flag as an override for the target specification....

[oota-llvm.git] / lib / Target / ARM / ARMSubtarget.cpp

diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 6db36dff29ca5b2d1bf6a276a73e3bb405a5da81..704cf7abfb387bed4ce0bbcf2927b4b71230d6d7 100644 (file)
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -2,8 +2,8 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by Evan Cheng and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -13,35 +13,76 @@
 
 #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
-  std::string CPU = "generic";
 
   // Parse features string.
-  ParseSubtargetFeatures(FS, CPU);
+  CPUString = ParseSubtargetFeatures(FS, CPUString);
 
   // 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();
-  if (TT.length() > 5) {
+  unsigned Len = TT.length();
+  unsigned Idx = 0;
+
+  if (Len >= 5 && TT.substr(0, 4) == "armv")
+    Idx = 4;
+  else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
+    IsThumb = true;
+    if (Len >= 7 && TT[5] == 'v')
+      Idx = 6;
+  }
+  if (Idx) {
+    unsigned SubVer = TT[Idx];
+    if (SubVer > '4' && SubVer <= '9') {
+      if (SubVer >= '7') {
+        ARMArchVersion = V7A;
+      } else if (SubVer == '6') {
+        ARMArchVersion = V6;
+        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)
@@ -50,8 +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;
 }