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

propagate changes.

llvm-svn: 228997
This commit is contained in:
Eric Christopher 2015-02-13 00:39:36 +00:00
parent f71609b5dd
commit 736d39e189
3 changed files with 10 additions and 7 deletions
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7
llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
View File

@ -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(

5
llvm/lib/Target/PowerPC/PPCFrameLowering.h
View File

@ -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.

5
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -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,