Make LABEL a builtin opcode.

[oota-llvm.git] / lib / Target / PowerPC / PPCSubtarget.cpp

diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index 94af54c35916769119207637933491eb6081ef94..235b9d591de662bf92b176d060de893b4197b285 100644 (file)
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -1,4 +1,4 @@
-//===- PowerPCSubtarget.cpp - PPC Subtarget Information ---------*- C++ -*-===//
+//===- PowerPCSubtarget.cpp - PPC Subtarget Information -------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -14,23 +14,10 @@
 #include "PPCSubtarget.h"
 #include "PPC.h"
 #include "llvm/Module.h"
-#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetMachine.h"
 #include "PPCGenSubtarget.inc"
-
 using namespace llvm;
-PPCTargetEnum llvm::PPCTarget = TargetDefault;
 
-namespace llvm {
-  cl::opt<PPCTargetEnum, true>
-  PPCTargetArg(cl::desc("Force generation of code for a specific PPC target:"),
-               cl::values(
-                          clEnumValN(TargetAIX,  "aix", "  Enable AIX codegen"),
-                          clEnumValN(TargetDarwin,"darwin",
-                                     "  Enable Darwin codegen"),
-                          clEnumValEnd),
-               cl::location(PPCTarget), cl::init(TargetDefault));
-} 
- 
 #if defined(__APPLE__)
 #include <mach/mach.h>
 #include <mach/mach_host.h>
@@ -69,15 +56,19 @@ static const char *GetCurrentPowerPCCPU() {
 #endif
 
 
-PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
-  : StackAlignment(16)
+PPCSubtarget::PPCSubtarget(const TargetMachine &tm, const Module &M,
+                           const std::string &FS, bool is64Bit)
+  : TM(tm)
+  , StackAlignment(16)
   , IsGigaProcessor(false)
-  , Is64Bit(false)
-  , Has64BitRegs(false)
+  , Has64BitSupport(false)
+  , Use64BitRegs(false)
+  , IsPPC64(is64Bit)
   , HasAltivec(false)
   , HasFSQRT(false)
-  , IsAIX(false)
-  , IsDarwin(false) {
+  , HasSTFIWX(false)
+  , IsDarwin(false)
+  , HasLazyResolverStubs(false) {
 
   // Determine default and user specified characteristics
   std::string CPU = "generic";
@@ -88,16 +79,63 @@ PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
   // Parse features string.
   ParseSubtargetFeatures(FS, CPU);
 
+  // If we are generating code for ppc64, verify that options make sense.
+  if (is64Bit) {
+    if (!has64BitSupport()) {
+      cerr << "PPC: Generation of 64-bit code for a 32-bit processor "
+           << "requested.  Ignoring 32-bit processor feature.\n";
+      Has64BitSupport = true;
+    }
+    // Silently force 64-bit register use on ppc64.
+    Use64BitRegs = true;
+  }
+  
+  // If the user requested use of 64-bit regs, but the cpu selected doesn't
+  // support it, warn and ignore.
+  if (use64BitRegs() && !has64BitSupport()) {
+    cerr << "PPC: 64-bit registers requested on CPU without support.  "
+         << "Disabling 64-bit register use.\n";
+    Use64BitRegs = false;
+  }
+  
   // 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) {
-    IsDarwin = TT.find("darwin") != std::string::npos;
+    IsDarwin = TT.find("-darwin") != std::string::npos;
   } else if (TT.empty()) {
-#if defined(_POWER)
-    IsAIX = true;
-#elif defined(__APPLE__)
+#if defined(__APPLE__)
     IsDarwin = true;
 #endif
   }
+
+  // Set up darwin-specific properties.
+  if (IsDarwin) {
+    HasLazyResolverStubs = true;
+    AsmFlavor = NewMnemonic;
+  } else {
+    AsmFlavor = OldMnemonic;
+  }
+}
+
+/// SetJITMode - This is called to inform the subtarget info that we are
+/// producing code for the JIT.
+void PPCSubtarget::SetJITMode() {
+  // JIT mode doesn't want lazy resolver stubs, it knows exactly where
+  // everything is.  This matters for PPC64, which codegens in PIC mode without
+  // stubs.
+  HasLazyResolverStubs = false;
+}
+
+
+/// hasLazyResolverStub - Return true if accesses to the specified global have
+/// to go through a dyld lazy resolution stub.  This means that an extra load
+/// is required to get the address of the global.
+bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV) const {
+  // We never hae stubs if HasLazyResolverStubs=false or if in static mode.
+  if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
+    return false;
+  
+  return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
+         (GV->isExternal() && !GV->hasNotBeenReadFromBytecode());
 }