cl::opt<bool> ANDIGlueBug("expose-ppc-andi-glue-bug",
cl::desc("expose the ANDI glue bug on PPC"), cl::Hidden);
-cl::opt<bool> UseBitPermRewriter("ppc-use-bit-perm-rewriter", cl::init(true),
- cl::desc("use aggressive ppc isel for bit permutations"), cl::Hidden);
-cl::opt<bool> BPermRewriterNoMasking("ppc-bit-perm-rewriter-stress-rotates",
- cl::desc("stress rotate selection in aggressive ppc isel for "
- "bit permutations"), cl::Hidden);
+static cl::opt<bool>
+ UseBitPermRewriter("ppc-use-bit-perm-rewriter", cl::init(true),
+ cl::desc("use aggressive ppc isel for bit permutations"),
+ cl::Hidden);
+static cl::opt<bool> BPermRewriterNoMasking(
+ "ppc-bit-perm-rewriter-stress-rotates",
+ cl::desc("stress rotate selection in aggressive ppc isel for "
+ "bit permutations"),
+ cl::Hidden);
namespace llvm {
void initializePPCDAGToDAGISelPass(PassRegistry&);
///
class PPCDAGToDAGISel : public SelectionDAGISel {
const PPCTargetMachine &TM;
- const PPCTargetLowering *PPCLowering;
const PPCSubtarget *PPCSubTarget;
+ const PPCTargetLowering *PPCLowering;
unsigned GlobalBaseReg;
public:
explicit PPCDAGToDAGISel(PPCTargetMachine &tm)
- : SelectionDAGISel(tm), TM(tm),
- PPCLowering(TM.getSubtargetImpl()->getTargetLowering()),
- PPCSubTarget(TM.getSubtargetImpl()) {
+ : SelectionDAGISel(tm), TM(tm) {
initializePPCDAGToDAGISelPass(*PassRegistry::getPassRegistry());
}
bool runOnMachineFunction(MachineFunction &MF) override {
// Make sure we re-emit a set of the global base reg if necessary
GlobalBaseReg = 0;
- PPCLowering = TM.getSubtargetImpl()->getTargetLowering();
- PPCSubTarget = TM.getSubtargetImpl();
+ PPCSubTarget = &MF.getSubtarget<PPCSubtarget>();
+ PPCLowering = PPCSubTarget->getTargetLowering();
SelectionDAGISel::runOnMachineFunction(MF);
if (!PPCSubTarget->isSVR4ABI())
std::vector<SDValue> &OutOps) override {
// We need to make sure that this one operand does not end up in r0
// (because we might end up lowering this as 0(%op)).
- const TargetRegisterInfo *TRI = TM.getSubtargetImpl()->getRegisterInfo();
+ const TargetRegisterInfo *TRI = PPCSubTarget->getRegisterInfo();
const TargetRegisterClass *TRC = TRI->getPointerRegClass(*MF, /*Kind=*/1);
SDValue RC = CurDAG->getTargetConstant(TRC->getID(), MVT::i32);
SDValue NewOp =
void PeepholeCROps();
SDValue combineToCMPB(SDNode *N);
+ void foldBoolExts(SDValue &Res, SDNode *&N);
bool AllUsersSelectZero(SDNode *N);
void SwapAllSelectUsers(SDNode *N);
unsigned InVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
unsigned UpdatedVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
- const TargetInstrInfo &TII = *TM.getSubtargetImpl()->getInstrInfo();
+ const TargetInstrInfo &TII = *PPCSubTarget->getInstrInfo();
MachineBasicBlock &EntryBB = *Fn.begin();
DebugLoc dl;
// Emit the following code into the entry block:
///
SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
if (!GlobalBaseReg) {
- const TargetInstrInfo &TII = *TM.getSubtargetImpl()->getInstrInfo();
+ const TargetInstrInfo &TII = *PPCSubTarget->getInstrInfo();
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = MF->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
if (M->getPICLevel() == PICLevel::Small) {
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MoveGOTtoLR));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
+ MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
} else {
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
if (isInt64Immediate(N->getOperand(1).getNode(), Imm64) &&
isMask_64(Imm64)) {
SDValue Val = N->getOperand(0);
- MB = 64 - CountTrailingOnes_64(Imm64);
+ MB = 64 - countTrailingOnes(Imm64);
SH = 0;
// If the operand is a logical right shift, we can fold it into this
return Res;
}
+// When CR bit registers are enabled, an extension of an i1 variable to a i32
+// or i64 value is lowered in terms of a SELECT_I[48] operation, and thus
+// involves constant materialization of a 0 or a 1 or both. If the result of
+// the extension is then operated upon by some operator that can be constant
+// folded with a constant 0 or 1, and that constant can be materialized using
+// only one instruction (like a zero or one), then we should fold in those
+// operations with the select.
+void PPCDAGToDAGISel::foldBoolExts(SDValue &Res, SDNode *&N) {
+ if (!PPCSubTarget->useCRBits())
+ return;
+
+ if (N->getOpcode() != ISD::ZERO_EXTEND &&
+ N->getOpcode() != ISD::SIGN_EXTEND &&
+ N->getOpcode() != ISD::ANY_EXTEND)
+ return;
+
+ if (N->getOperand(0).getValueType() != MVT::i1)
+ return;
+
+ if (!N->hasOneUse())
+ return;
+
+ SDLoc dl(N);
+ EVT VT = N->getValueType(0);
+ SDValue Cond = N->getOperand(0);
+ SDValue ConstTrue =
+ CurDAG->getConstant(N->getOpcode() == ISD::SIGN_EXTEND ? -1 : 1, VT);
+ SDValue ConstFalse = CurDAG->getConstant(0, VT);
+
+ do {
+ SDNode *User = *N->use_begin();
+ if (User->getNumOperands() != 2)
+ break;
+
+ auto TryFold = [this, N, User](SDValue Val) {
+ SDValue UserO0 = User->getOperand(0), UserO1 = User->getOperand(1);
+ SDValue O0 = UserO0.getNode() == N ? Val : UserO0;
+ SDValue O1 = UserO1.getNode() == N ? Val : UserO1;
+
+ return CurDAG->FoldConstantArithmetic(User->getOpcode(),
+ User->getValueType(0),
+ O0.getNode(), O1.getNode());
+ };
+
+ SDValue TrueRes = TryFold(ConstTrue);
+ if (!TrueRes)
+ break;
+ SDValue FalseRes = TryFold(ConstFalse);
+ if (!FalseRes)
+ break;
+
+ // For us to materialize these using one instruction, we must be able to
+ // represent them as signed 16-bit integers.
+ uint64_t True = cast<ConstantSDNode>(TrueRes)->getZExtValue(),
+ False = cast<ConstantSDNode>(FalseRes)->getZExtValue();
+ if (!isInt<16>(True) || !isInt<16>(False))
+ break;
+
+ // We can replace User with a new SELECT node, and try again to see if we
+ // can fold the select with its user.
+ Res = CurDAG->getSelect(dl, User->getValueType(0), Cond, TrueRes, FalseRes);
+ N = User;
+ ConstTrue = TrueRes;
+ ConstFalse = FalseRes;
+ } while (N->hasOneUse());
+}
+
void PPCDAGToDAGISel::PreprocessISelDAG() {
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
break;
}
+ if (!Res)
+ foldBoolExts(Res, N);
+
if (Res) {
DEBUG(dbgs() << "PPC DAG preprocessing replacing:\nOld: ");
DEBUG(N->dump(CurDAG));
projects / oota-llvm.git / blobdiff