Merging r259342 (with s/p2align 4/align 16) because r258750 is not in 3.8.

[oota-llvm.git] / lib / Target / SystemZ / SystemZSubtarget.cpp

diff --git a/lib/Target/SystemZ/SystemZSubtarget.cpp b/lib/Target/SystemZ/SystemZSubtarget.cpp
index b3ed06639758ca087bf1688df9e2ccac1e3567e6..0b49fcdd8f78aa2687776befc4db9a5e5464d2e2 100644 (file)
--- a/lib/Target/SystemZ/SystemZSubtarget.cpp
+++ b/lib/Target/SystemZ/SystemZSubtarget.cpp
@@ -1,4 +1,4 @@
-//===- SystemZSubtarget.cpp - SystemZ Subtarget Information -------*- C++ -*-=//
+//===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,49 +6,67 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This file implements the SystemZ specific subclass of TargetSubtargetInfo.
-//
-//===----------------------------------------------------------------------===//
 
 #include "SystemZSubtarget.h"
-#include "SystemZ.h"
-#include "llvm/GlobalValue.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetRegistry.h"
+#include "MCTargetDesc/SystemZMCTargetDesc.h"
+#include "llvm/IR/GlobalValue.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "systemz-subtarget"
 
 #define GET_SUBTARGETINFO_TARGET_DESC
 #define GET_SUBTARGETINFO_CTOR
 #include "SystemZGenSubtargetInfo.inc"
 
-using namespace llvm;
+// Pin the vtable to this file.
+void SystemZSubtarget::anchor() {}
 
-SystemZSubtarget::SystemZSubtarget(const std::string &TT, 
-                                   const std::string &CPU,
-                                   const std::string &FS):
-  SystemZGenSubtargetInfo(TT, CPU, FS), HasZ10Insts(false) {
+SystemZSubtarget &
+SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
   std::string CPUName = CPU;
   if (CPUName.empty())
-    CPUName = "z9";
-
+    CPUName = "generic";
   // Parse features string.
   ParseSubtargetFeatures(CPUName, FS);
+  return *this;
 }
 
-/// True if accessing the GV requires an extra load.
-bool SystemZSubtarget::GVRequiresExtraLoad(const GlobalValue* GV,
-                                           const TargetMachine& TM,
-                                           bool isDirectCall) const {
-  if (TM.getRelocationModel() == Reloc::PIC_) {
-    // Extra load is needed for all externally visible.
-    if (isDirectCall)
-      return false;
-
-    if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
-      return false;
+SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
+                                   const std::string &FS,
+                                   const TargetMachine &TM)
+    : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
+      HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
+      HasPopulationCount(false), HasFastSerialization(false),
+      HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
+      HasTransactionalExecution(false), HasProcessorAssist(false),
+      HasVector(false), TargetTriple(TT),
+      InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
+      TSInfo(), FrameLowering() {}
 
+// Return true if GV binds locally under reloc model RM.
+static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) {
+  // For non-PIC, all symbols bind locally.
+  if (RM == Reloc::Static)
     return true;
-  }
 
+  return GV->hasLocalLinkage() || !GV->hasDefaultVisibility();
+}
+
+bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
+                                       Reloc::Model RM,
+                                       CodeModel::Model CM) const {
+  // PC32DBL accesses require the low bit to be clear.  Note that a zero
+  // value selects the default alignment and is therefore OK.
+  if (GV->getAlignment() == 1)
+    return false;
+
+  // For the small model, all locally-binding symbols are in range.
+  if (CM == CodeModel::Small)
+    return bindsLocally(GV, RM);
+
+  // For Medium and above, assume that the symbol is not within the 4GB range.
+  // Taking the address of locally-defined text would be OK, but that
+  // case isn't easy to detect.
   return false;
 }