[PPC64] Add support for the ICBT instruction on POWER8.

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

diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index d6b964d372c84f9f36d2f5d6e785cc960c4e0bb7..ab36e90eaac0cc9a8b42cfadf3509ad2174fd846 100644 (file)
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -19,6 +19,7 @@
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalValue.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Target/TargetMachine.h"
@@ -32,6 +33,9 @@ using namespace llvm;
 #define GET_SUBTARGETINFO_CTOR
 #include "PPCGenSubtargetInfo.inc"
 
+static cl::opt<bool> UseSubRegLiveness("ppc-track-subreg-liveness",
+cl::desc("Enable subregister liveness tracking for PPC"), cl::Hidden);
+
 /// Return the datalayout string of a subtarget.
 static std::string getDataLayoutString(const Triple &T) {
   bool is64Bit = T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le;
@@ -108,6 +112,7 @@ void PPCSubtarget::initializeEnvironment() {
   HasFPCVT = false;
   HasISEL = false;
   HasPOPCNTD = false;
+  HasCMPB = false;
   HasLDBRX = false;
   IsBookE = false;
   HasOnlyMSYNC = false;
@@ -117,6 +122,8 @@ void PPCSubtarget::initializeEnvironment() {
   DeprecatedMFTB = false;
   DeprecatedDST = false;
   HasLazyResolverStubs = false;
+  HasICBT = false;
+
 }
 
 void PPCSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
@@ -154,13 +161,6 @@ void PPCSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
   // Determine endianness.
   IsLittleEndian = (TargetTriple.getArch() == Triple::ppc64le);
 
-  // FIXME: For now, we disable VSX in little-endian mode until endian
-  // issues in those instructions can be addressed.
-  if (IsLittleEndian) {
-    HasVSX = false;
-    HasP8Vector = false;
-  }
-
   // Determine default ABI.
   if (TargetABI == PPC_ABI_UNKNOWN) {
     if (!isDarwin() && IsPPC64) {
@@ -180,9 +180,7 @@ bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
   // We never have stubs if HasLazyResolverStubs=false or if in static mode.
   if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
     return false;
-  // If symbol visibility is hidden, the extra load is not needed if
-  // the symbol is definitely defined in the current translation unit.
-  bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
+  bool isDecl = GV->isDeclaration();
   if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
     return false;
   return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
@@ -242,3 +240,7 @@ bool PPCSubtarget::useAA() const {
   return needsAggressiveScheduling(DarwinDirective);
 }
 
+bool PPCSubtarget::enableSubRegLiveness() const {
+  return UseSubRegLiveness;
+}
+