The TOC save offset can be computed at compile time, do so and

propagate changes.

llvm-svn: 228997

3 files changed, 10 insertions, 7 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
index 33f66fed81c..a2471da2f7a 100644
--- a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
@@ -43,10 +43,15 @@ static unsigned computeReturnSaveOffset(const PPCSubtarget &STI) {
   return STI.isPPC64() ? 16 : 4;
 }
 
+static unsigned computeTOCSaveOffset(const PPCSubtarget &STI) {
+  return STI.isELFv2ABI() ? 24 : 40;
+}
+
 PPCFrameLowering::PPCFrameLowering(const PPCSubtarget &STI)
     : TargetFrameLowering(TargetFrameLowering::StackGrowsDown,
                           (STI.hasQPX() || STI.isBGQ()) ? 32 : 16, 0),
-      Subtarget(STI), ReturnSaveOffset(computeReturnSaveOffset(Subtarget)) {}
+      Subtarget(STI), ReturnSaveOffset(computeReturnSaveOffset(Subtarget)),
+      TOCSaveOffset(computeTOCSaveOffset(Subtarget)) {}
 
 // With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
 const PPCFrameLowering::SpillSlot *PPCFrameLowering::getCalleeSavedSpillSlots(
diff --git a/llvm/lib/Target/PowerPC/PPCFrameLowering.h b/llvm/lib/Target/PowerPC/PPCFrameLowering.h
index 32053a186ff..c67541699e6 100644
--- a/llvm/lib/Target/PowerPC/PPCFrameLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCFrameLowering.h
@@ -24,6 +24,7 @@ class PPCSubtarget;
 class PPCFrameLowering: public TargetFrameLowering {
   const PPCSubtarget &Subtarget;
   const unsigned ReturnSaveOffset;
+  const unsigned TOCSaveOffset;
 
 public:
   PPCFrameLowering(const PPCSubtarget &STI);
@@ -72,9 +73,7 @@ public:
 
   /// getTOCSaveOffset - Return the previous frame offset to save the
   /// TOC register -- 64-bit SVR4 ABI only.
-  static unsigned getTOCSaveOffset(bool isELFv2ABI) {
-    return isELFv2ABI ? 24 : 40;
-  }
+  unsigned getTOCSaveOffset() const { return TOCSaveOffset; }
 
   /// getFramePointerSaveOffset - Return the previous frame offset to save the
   /// frame pointer.
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 70938dd948d..0fdad366ecb 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -3900,7 +3900,6 @@ PPCTargetLowering::FinishCall(CallingConv::ID CallConv, SDLoc dl,
                               SmallVectorImpl<SDValue> &InVals,
                               ImmutableCallSite *CS) const {
 
-  bool isELFv2ABI = Subtarget.isELFv2ABI();
   std::vector<EVT> NodeTys;
   SmallVector<SDValue, 8> Ops;
   unsigned CallOpc = PrepareCall(DAG, Callee, InFlag, Chain, CallSeqStart, dl,
@@ -3964,7 +3963,7 @@ PPCTargetLowering::FinishCall(CallingConv::ID CallConv, SDLoc dl,
 
       EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
       SDValue StackPtr = DAG.getRegister(PPC::X1, PtrVT);
-      unsigned TOCSaveOffset = PPCFrameLowering::getTOCSaveOffset(isELFv2ABI);
+      unsigned TOCSaveOffset = Subtarget.getFrameLowering()->getTOCSaveOffset();
       SDValue TOCOff = DAG.getIntPtrConstant(TOCSaveOffset);
       SDValue AddTOC = DAG.getNode(ISD::ADD, dl, MVT::i64, StackPtr, TOCOff);
 
@@ -4789,7 +4788,7 @@ PPCTargetLowering::LowerCall_64SVR4(SDValue Chain, SDValue Callee,
     setUsesTOCBasePtr(DAG);
     SDValue Val = DAG.getCopyFromReg(Chain, dl, PPC::X2, MVT::i64);
     // TOC save area offset.
-    unsigned TOCSaveOffset = PPCFrameLowering::getTOCSaveOffset(isELFv2ABI);
+    unsigned TOCSaveOffset = Subtarget.getFrameLowering()->getTOCSaveOffset();
     SDValue PtrOff = DAG.getIntPtrConstant(TOCSaveOffset);
     SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
     Chain = DAG.getStore(Val.getValue(1), dl, Val, AddPtr,