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Fix the last of the major PPC GEP folding deficiencies. This will allow
the ISel to use indexed and non-zero immediate offsets for GEPs that have more than one use. This is common for instruction sequences such as a load followed by a modify and store to the same address. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16493 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -32,7 +32,8 @@
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using namespace llvm;
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namespace {
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Statistic<> NumSetCC("ppc-codegen", "Number of SetCC straight-lined");
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Statistic<>
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MultiUseGEP("ppc-codegen", "Number of GEPs folded with more than one use");
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/// TypeClass - Used by the PowerPC backend to group LLVM types by their basic
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/// PPC Representation.
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@ -79,13 +80,35 @@ namespace {
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MachineBasicBlock *BB; // The current MBB we are compiling
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int VarArgsFrameIndex; // FrameIndex for start of varargs area
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std::map<Value*, unsigned> RegMap; // Mapping between Values and SSA Regs
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/// CollapsedGepOp - This struct is for recording the intermediate results
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/// used to calculate the base, index, and offset of a GEP instruction.
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struct CollapsedGepOp {
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ConstantSInt *offset; // the current offset into the struct/array
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Value *index; // the index of the array element
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ConstantUInt *size; // the size of each array element
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CollapsedGepOp(ConstantSInt *o, Value *i, ConstantUInt *s) :
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offset(o), index(i), size(s) {}
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};
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/// FoldedGEP - This struct is for recording the necessary information to
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/// emit the GEP in a load or store instruction, used by emitGEPOperation.
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struct FoldedGEP {
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unsigned base;
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unsigned index;
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ConstantSInt *offset;
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FoldedGEP() : base(0), index(0), offset(0) {}
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FoldedGEP(unsigned b, unsigned i, ConstantSInt *o) :
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base(b), index(i), offset(o) {}
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};
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// External functions used in the Module
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Function *fmodfFn, *fmodFn, *__cmpdi2Fn, *__moddi3Fn, *__divdi3Fn,
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*__umoddi3Fn, *__udivdi3Fn, *__fixsfdiFn, *__fixdfdiFn, *__fixunssfdiFn,
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*__fixunsdfdiFn, *__floatdisfFn, *__floatdidfFn, *mallocFn, *freeFn;
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// Mapping between Values and SSA Regs
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std::map<Value*, unsigned> RegMap;
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// MBBMap - Mapping between LLVM BB -> Machine BB
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std::map<const BasicBlock*, MachineBasicBlock*> MBBMap;
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@ -93,6 +116,9 @@ namespace {
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// FrameIndex for the alloca.
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std::map<AllocaInst*, unsigned> AllocaMap;
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// GEPMap - Mapping between basic blocks and GEP definitions
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std::map<GetElementPtrInst*, FoldedGEP> GEPMap;
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// A Reg to hold the base address used for global loads and stores, and a
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// flag to set whether or not we need to emit it for this function.
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unsigned GlobalBaseReg;
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@ -170,6 +196,7 @@ namespace {
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// Select the PHI nodes
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SelectPHINodes();
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GEPMap.clear();
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RegMap.clear();
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MBBMap.clear();
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AllocaMap.clear();
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@ -223,15 +250,6 @@ namespace {
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ValueRecord(Value *V) : Val(V), Reg(0), Ty(V->getType()) {}
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};
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// This struct is for recording the necessary operations to emit the GEP
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struct CollapsedGepOp {
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bool isMul;
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Value *index;
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ConstantSInt *size;
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CollapsedGepOp(bool mul, Value *i, ConstantSInt *s) :
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isMul(mul), index(i), size(s) {}
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};
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void doCall(const ValueRecord &Ret, MachineInstr *CallMI,
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const std::vector<ValueRecord> &Args, bool isVarArg);
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void visitCallInst(CallInst &I);
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@ -292,10 +310,7 @@ namespace {
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/// constant expression GEP support.
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///
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void emitGEPOperation(MachineBasicBlock *BB, MachineBasicBlock::iterator IP,
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Value *Src, User::op_iterator IdxBegin,
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User::op_iterator IdxEnd, unsigned TargetReg,
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bool CollapseRemainder, ConstantSInt **Remainder,
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unsigned *PendingAddReg);
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GetElementPtrInst *GEPI, bool foldGEP);
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/// emitCastOperation - Common code shared between visitCastInst and
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/// constant expression cast support.
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@ -377,6 +392,13 @@ namespace {
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void emitUCOM(MachineBasicBlock *MBB, MachineBasicBlock::iterator MBBI,
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unsigned LHS, unsigned RHS);
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/// emitAdd - A convenience function to emit the necessary code to add a
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/// constant signed value to a register.
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///
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void emitAdd(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator IP,
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unsigned Op0Reg, ConstantSInt *Op1, unsigned DestReg);
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/// makeAnotherReg - This method returns the next register number we haven't
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/// yet used.
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///
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@ -905,25 +927,37 @@ static SetCondInst *canFoldSetCCIntoBranchOrSelect(Value *V) {
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return 0;
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}
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// canFoldGEPIntoLoadOrStore - Return the GEP instruction if we can fold it into
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// the load or store instruction that is the only user of the GEP.
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//
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static GetElementPtrInst *canFoldGEPIntoLoadOrStore(Value *V) {
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if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(V))
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if (GEPI->hasOneUse()) {
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Instruction *User = cast<Instruction>(GEPI->use_back());
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if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(V)) {
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bool AllUsesAreMem = true;
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for (Value::use_iterator I = GEPI->use_begin(), E = GEPI->use_end();
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I != E; ++I) {
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Instruction *User = cast<Instruction>(*I);
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// If the GEP is the target of a store, but not the source, then we are ok
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// to fold it.
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if (isa<StoreInst>(User) &&
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GEPI->getParent() == User->getParent() &&
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User->getOperand(0) != GEPI &&
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User->getOperand(1) == GEPI) {
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return GEPI;
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}
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User->getOperand(1) == GEPI)
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continue;
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// If the GEP is the source of a load, then we're always ok to fold it
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if (isa<LoadInst>(User) &&
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GEPI->getParent() == User->getParent() &&
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User->getOperand(0) == GEPI) {
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return GEPI;
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User->getOperand(0) == GEPI)
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continue;
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// if we got to this point, than the instruction was not a load or store
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// that we are capable of folding the GEP into.
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AllUsesAreMem = false;
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break;
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}
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if (AllUsesAreMem)
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return GEPI;
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}
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return 0;
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}
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@ -1125,7 +1159,6 @@ void PPC32ISel::visitSetCondInst(SetCondInst &I) {
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ConstantInt *CI = dyn_cast<ConstantInt>(Op1);
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if (CI && CI->getRawValue() == 0) {
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++NumSetCC;
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unsigned Op0Reg = ExtendOrClear(BB, MI, Op0);
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// comparisons against constant zero and negative one often have shorter
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@ -1249,8 +1282,6 @@ void PPC32ISel::visitSelectInst(SelectInst &SI) {
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/// emitSelect - Common code shared between visitSelectInst and the constant
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/// expression support.
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/// FIXME: this is most likely broken in one or more ways. Namely, PowerPC has
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/// no select instruction. FSEL only works for comparisons against zero.
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void PPC32ISel::emitSelectOperation(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator IP,
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Value *Cond, Value *TrueVal,
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@ -2565,47 +2596,33 @@ void PPC32ISel::visitLoadInst(LoadInst &I) {
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return;
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}
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// If this load is the only use of the GEP instruction that is its address,
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// then we can fold the GEP directly into the load instruction.
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// emitGEPOperation with a second to last arg of 'true' will place the
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// base register for the GEP into baseReg, and the constant offset from that
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// into offset. If the offset fits in 16 bits, we can emit a reg+imm store
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// otherwise, we copy the offset into another reg, and use reg+reg addressing.
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// If the offset fits in 16 bits, we can emit a reg+imm load, otherwise, we
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// use the index from the FoldedGEP struct and use reg+reg addressing.
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if (GetElementPtrInst *GEPI = canFoldGEPIntoLoadOrStore(SourceAddr)) {
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unsigned baseReg = getReg(GEPI);
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unsigned pendingAdd;
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ConstantSInt *offset;
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emitGEPOperation(BB, BB->end(), GEPI->getOperand(0), GEPI->op_begin()+1,
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GEPI->op_end(), baseReg, true, &offset, &pendingAdd);
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// Generate the code for the GEP and get the components of the folded GEP
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emitGEPOperation(BB, BB->end(), GEPI, true);
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unsigned baseReg = GEPMap[GEPI].base;
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unsigned indexReg = GEPMap[GEPI].index;
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ConstantSInt *offset = GEPMap[GEPI].offset;
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if (pendingAdd == 0 && Class != cLong &&
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canUseAsImmediateForOpcode(offset, 0)) {
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if (LoadNeedsSignExtend(I)) {
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if (Class != cLong) {
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unsigned TmpReg = makeAnotherReg(I.getType());
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if (indexReg == 0)
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BuildMI(BB, ImmOpcode, 2, TmpReg).addSImm(offset->getValue())
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.addReg(baseReg);
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else
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BuildMI(BB, IdxOpcode, 2, TmpReg).addReg(indexReg).addReg(baseReg);
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if (LoadNeedsSignExtend(I))
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BuildMI(BB, PPC::EXTSB, 1, DestReg).addReg(TmpReg);
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else
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BuildMI(BB, PPC::OR, 2, DestReg).addReg(TmpReg).addReg(TmpReg);
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} else {
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BuildMI(BB, ImmOpcode, 2, DestReg).addSImm(offset->getValue())
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.addReg(baseReg);
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}
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return;
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}
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unsigned indexReg = (pendingAdd != 0) ? pendingAdd : getReg(offset);
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if (Class == cLong) {
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indexReg = (indexReg != 0) ? indexReg : getReg(offset);
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unsigned indexPlus4 = makeAnotherReg(Type::IntTy);
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BuildMI(BB, PPC::ADDI, 2, indexPlus4).addReg(indexReg).addSImm(4);
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BuildMI(BB, IdxOpcode, 2, DestReg).addReg(indexReg).addReg(baseReg);
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BuildMI(BB, IdxOpcode, 2, DestReg+1).addReg(indexPlus4).addReg(baseReg);
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} else if (LoadNeedsSignExtend(I)) {
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unsigned TmpReg = makeAnotherReg(I.getType());
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BuildMI(BB, IdxOpcode, 2, TmpReg).addReg(indexReg).addReg(baseReg);
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BuildMI(BB, PPC::EXTSB, 1, DestReg).addReg(TmpReg);
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} else {
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BuildMI(BB, IdxOpcode, 2, DestReg).addReg(indexReg).addReg(baseReg);
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}
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return;
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}
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@ -2647,38 +2664,30 @@ void PPC32ISel::visitStoreInst(StoreInst &I) {
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unsigned IdxOpcode = IdxOpcodes[Class];
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unsigned ValReg = getReg(I.getOperand(0));
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// If this store is the only use of the GEP instruction that is its address,
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// then we can fold the GEP directly into the store instruction.
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// emitGEPOperation with a second to last arg of 'true' will place the
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// base register for the GEP into baseReg, and the constant offset from that
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// into offset. If the offset fits in 16 bits, we can emit a reg+imm store
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// otherwise, we copy the offset into another reg, and use reg+reg addressing.
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// If the offset fits in 16 bits, we can emit a reg+imm store, otherwise, we
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// use the index from the FoldedGEP struct and use reg+reg addressing.
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if (GetElementPtrInst *GEPI = canFoldGEPIntoLoadOrStore(SourceAddr)) {
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unsigned baseReg = getReg(GEPI);
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unsigned pendingAdd;
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ConstantSInt *offset;
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// Generate the code for the GEP and get the components of the folded GEP
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emitGEPOperation(BB, BB->end(), GEPI, true);
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unsigned baseReg = GEPMap[GEPI].base;
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unsigned indexReg = GEPMap[GEPI].index;
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ConstantSInt *offset = GEPMap[GEPI].offset;
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emitGEPOperation(BB, BB->end(), GEPI->getOperand(0), GEPI->op_begin()+1,
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GEPI->op_end(), baseReg, true, &offset, &pendingAdd);
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if (0 == pendingAdd && Class != cLong &&
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canUseAsImmediateForOpcode(offset, 0)) {
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if (Class != cLong) {
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if (indexReg == 0)
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BuildMI(BB, ImmOpcode, 3).addReg(ValReg).addSImm(offset->getValue())
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.addReg(baseReg);
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return;
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}
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unsigned indexReg = (pendingAdd != 0) ? pendingAdd : getReg(offset);
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if (Class == cLong) {
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else
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BuildMI(BB, IdxOpcode, 3).addReg(ValReg).addReg(indexReg)
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.addReg(baseReg);
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} else {
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indexReg = (indexReg != 0) ? indexReg : getReg(offset);
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unsigned indexPlus4 = makeAnotherReg(Type::IntTy);
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BuildMI(BB, PPC::ADDI, 2, indexPlus4).addReg(indexReg).addSImm(4);
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BuildMI(BB, IdxOpcode, 3).addReg(ValReg).addReg(indexReg).addReg(baseReg);
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BuildMI(BB, IdxOpcode, 3).addReg(ValReg+1).addReg(indexPlus4)
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.addReg(baseReg);
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return;
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}
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BuildMI(BB, IdxOpcode, 3).addReg(ValReg).addReg(indexReg).addReg(baseReg);
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return;
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}
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@ -3286,9 +3295,22 @@ void PPC32ISel::visitGetElementPtrInst(GetElementPtrInst &I) {
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if (canFoldGEPIntoLoadOrStore(&I))
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return;
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unsigned outputReg = getReg(I);
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emitGEPOperation(BB, BB->end(), I.getOperand(0), I.op_begin()+1, I.op_end(),
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outputReg, false, 0, 0);
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emitGEPOperation(BB, BB->end(), &I, false);
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}
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/// emitAdd - A convenience function to emit the necessary code to add a
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/// constant signed value to a register.
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///
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void PPC32ISel::emitAdd(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator IP,
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unsigned Op0Reg, ConstantSInt *Op1, unsigned DestReg) {
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if (canUseAsImmediateForOpcode(Op1, 0)) {
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BuildMI(*MBB, IP, PPC::ADDI, 2, DestReg).addReg(Op0Reg)
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.addSImm(Op1->getValue());
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} else {
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unsigned Op1Reg = getReg(Op1, MBB, IP);
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BuildMI(*MBB, IP, PPC::ADD, 2, DestReg).addReg(Op0Reg).addReg(Op1Reg);
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}
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}
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/// emitGEPOperation - Common code shared between visitGetElementPtrInst and
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@ -3296,13 +3318,19 @@ void PPC32ISel::visitGetElementPtrInst(GetElementPtrInst &I) {
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///
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void PPC32ISel::emitGEPOperation(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator IP,
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Value *Src, User::op_iterator IdxBegin,
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User::op_iterator IdxEnd, unsigned TargetReg,
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bool GEPIsFolded, ConstantSInt **RemainderPtr,
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unsigned *PendingAddReg) {
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GetElementPtrInst *GEPI, bool GEPIsFolded) {
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// If we've already emitted this particular GEP, just return to avoid
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// multiple definitions of the base register.
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if (GEPIsFolded && (GEPMap[GEPI].base != 0)) {
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MultiUseGEP++;
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return;
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}
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Value *Src = GEPI->getOperand(0);
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User::op_iterator IdxBegin = GEPI->op_begin()+1;
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User::op_iterator IdxEnd = GEPI->op_end();
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const TargetData &TD = TM.getTargetData();
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const Type *Ty = Src->getType();
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unsigned basePtrReg = getReg(Src, MBB, IP);
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int64_t constValue = 0;
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// Record the operations to emit the GEP in a vector so that we can emit them
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@ -3322,15 +3350,12 @@ void PPC32ISel::emitGEPOperation(MachineBasicBlock *MBB,
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// right byte offset from the StructLayout class's list of
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// structure member offsets.
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unsigned fieldIndex = cast<ConstantUInt>(idx)->getValue();
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unsigned memberOffset =
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TD.getStructLayout(StTy)->MemberOffsets[fieldIndex];
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// StructType member offsets are always constant values. Add it to the
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// running total.
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constValue += memberOffset;
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constValue += TD.getStructLayout(StTy)->MemberOffsets[fieldIndex];
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// The next type is the member of the structure selected by the
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// index.
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// The next type is the member of the structure selected by the index.
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Ty = StTy->getElementType (fieldIndex);
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} else if (const SequentialType *SqTy = dyn_cast<SequentialType>(Ty)) {
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// Many GEP instructions use a [cast (int/uint) to LongTy] as their
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@ -3355,111 +3380,71 @@ void PPC32ISel::emitGEPOperation(MachineBasicBlock *MBB,
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else
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assert(0 && "Invalid ConstantInt GEP index type!");
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} else {
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// Push current gep state to this point as an add
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ops.push_back(CollapsedGepOp(false, 0,
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ConstantSInt::get(Type::IntTy,constValue)));
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// Push multiply gep op and reset constant value
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ops.push_back(CollapsedGepOp(true, idx,
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ConstantSInt::get(Type::IntTy, elementSize)));
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// Push current gep state to this point as an add and multiply
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ops.push_back(CollapsedGepOp(
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ConstantSInt::get(Type::IntTy, constValue),
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idx, ConstantUInt::get(Type::UIntTy, elementSize)));
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constValue = 0;
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}
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}
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}
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// Emit instructions for all the collapsed ops
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bool pendingAdd = false;
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unsigned pendingAddReg = 0;
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unsigned indexReg = 0;
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for(std::vector<CollapsedGepOp>::iterator cgo_i = ops.begin(),
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cgo_e = ops.end(); cgo_i != cgo_e; ++cgo_i) {
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CollapsedGepOp& cgo = *cgo_i;
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unsigned nextBasePtrReg = makeAnotherReg(Type::IntTy);
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// If we didn't emit an add last time through the loop, we need to now so
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// that the base reg is updated appropriately.
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if (pendingAdd) {
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assert(pendingAddReg != 0 && "Uninitialized register in pending add!");
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BuildMI(*MBB, IP, PPC::ADD, 2, nextBasePtrReg).addReg(basePtrReg)
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.addReg(pendingAddReg);
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basePtrReg = nextBasePtrReg;
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nextBasePtrReg = makeAnotherReg(Type::IntTy);
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pendingAddReg = 0;
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pendingAdd = false;
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}
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unsigned TmpReg1 = makeAnotherReg(Type::IntTy);
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unsigned TmpReg2 = makeAnotherReg(Type::IntTy);
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doMultiplyConst(MBB, IP, TmpReg1, cgo.index, cgo.size);
|
||||
emitAdd(MBB, IP, TmpReg1, cgo.offset, TmpReg2);
|
||||
|
||||
if (cgo.isMul) {
|
||||
// We know the elementSize is a constant, so we can emit a constant mul
|
||||
unsigned TmpReg = makeAnotherReg(Type::IntTy);
|
||||
doMultiplyConst(MBB, IP, nextBasePtrReg, cgo.index, cgo.size);
|
||||
pendingAddReg = basePtrReg;
|
||||
pendingAdd = true;
|
||||
} else {
|
||||
// Try and generate an immediate addition if possible
|
||||
if (cgo.size->isNullValue()) {
|
||||
BuildMI(*MBB, IP, PPC::OR, 2, nextBasePtrReg).addReg(basePtrReg)
|
||||
.addReg(basePtrReg);
|
||||
} else if (canUseAsImmediateForOpcode(cgo.size, 0)) {
|
||||
BuildMI(*MBB, IP, PPC::ADDI, 2, nextBasePtrReg).addReg(basePtrReg)
|
||||
.addSImm(cgo.size->getValue());
|
||||
} else {
|
||||
unsigned Op1r = getReg(cgo.size, MBB, IP);
|
||||
BuildMI(*MBB, IP, PPC::ADD, 2, nextBasePtrReg).addReg(basePtrReg)
|
||||
.addReg(Op1r);
|
||||
if (indexReg == 0)
|
||||
indexReg = TmpReg2;
|
||||
else {
|
||||
unsigned TmpReg3 = makeAnotherReg(Type::IntTy);
|
||||
BuildMI(*MBB, IP, PPC::ADD, 2, TmpReg3).addReg(indexReg).addReg(TmpReg2);
|
||||
indexReg = TmpReg3;
|
||||
}
|
||||
}
|
||||
|
||||
basePtrReg = nextBasePtrReg;
|
||||
}
|
||||
// Add the current base register plus any accumulated constant value
|
||||
// We now have a base register, an index register, and possibly a constant
|
||||
// remainder. If the GEP is going to be folded, we try to generate the
|
||||
// optimal addressing mode.
|
||||
unsigned TargetReg = getReg(GEPI, MBB, IP);
|
||||
unsigned basePtrReg = getReg(Src, MBB, IP);
|
||||
ConstantSInt *remainder = ConstantSInt::get(Type::IntTy, constValue);
|
||||
|
||||
// If we are emitting this during a fold, copy the current base register to
|
||||
// the target, and save the current constant offset so the folding load or
|
||||
// store can try and use it as an immediate.
|
||||
if (GEPIsFolded) {
|
||||
// If this is a folded GEP and the last element was an index, then we need
|
||||
// to do some extra work to turn a shift/add/stw into a shift/stwx
|
||||
if (pendingAdd && 0 == remainder->getValue()) {
|
||||
assert(pendingAddReg != 0 && "Uninitialized register in pending add!");
|
||||
*PendingAddReg = pendingAddReg;
|
||||
} else {
|
||||
*PendingAddReg = 0;
|
||||
if (pendingAdd) {
|
||||
unsigned nextBasePtrReg = makeAnotherReg(Type::IntTy);
|
||||
assert(pendingAddReg != 0 && "Uninitialized register in pending add!");
|
||||
BuildMI(*MBB, IP, PPC::ADD, 2, nextBasePtrReg).addReg(basePtrReg)
|
||||
.addReg(pendingAddReg);
|
||||
basePtrReg = nextBasePtrReg;
|
||||
if (indexReg == 0) {
|
||||
if (!canUseAsImmediateForOpcode(remainder, 0)) {
|
||||
indexReg = getReg(remainder, MBB, IP);
|
||||
remainder = 0;
|
||||
}
|
||||
} else {
|
||||
unsigned TmpReg = makeAnotherReg(Type::IntTy);
|
||||
emitAdd(MBB, IP, indexReg, remainder, TmpReg);
|
||||
indexReg = TmpReg;
|
||||
remainder = 0;
|
||||
}
|
||||
BuildMI (*MBB, IP, PPC::OR, 2, TargetReg).addReg(basePtrReg)
|
||||
.addReg(basePtrReg);
|
||||
*RemainderPtr = remainder;
|
||||
GEPMap[GEPI] = FoldedGEP(TargetReg, indexReg, remainder);
|
||||
return;
|
||||
}
|
||||
|
||||
// If we still have a pending add at this point, emit it now
|
||||
if (pendingAdd) {
|
||||
// We're not folding, so collapse the base, index, and any remainder into the
|
||||
// destination register.
|
||||
if (indexReg != 0) {
|
||||
unsigned TmpReg = makeAnotherReg(Type::IntTy);
|
||||
BuildMI(*MBB, IP, PPC::ADD, 2, TmpReg).addReg(pendingAddReg)
|
||||
.addReg(basePtrReg);
|
||||
BuildMI(*MBB, IP, PPC::ADD, 2, TmpReg).addReg(indexReg).addReg(basePtrReg);
|
||||
basePtrReg = TmpReg;
|
||||
}
|
||||
|
||||
// After we have processed all the indices, the result is left in
|
||||
// basePtrReg. Move it to the register where we were expected to
|
||||
// put the answer.
|
||||
if (remainder->isNullValue()) {
|
||||
BuildMI (*MBB, IP, PPC::OR, 2, TargetReg).addReg(basePtrReg)
|
||||
.addReg(basePtrReg);
|
||||
} else if (canUseAsImmediateForOpcode(remainder, 0)) {
|
||||
BuildMI(*MBB, IP, PPC::ADDI, 2, TargetReg).addReg(basePtrReg)
|
||||
.addSImm(remainder->getValue());
|
||||
} else {
|
||||
unsigned Op1r = getReg(remainder, MBB, IP);
|
||||
BuildMI(*MBB, IP, PPC::ADD, 2, TargetReg).addReg(basePtrReg).addReg(Op1r);
|
||||
}
|
||||
emitAdd(MBB, IP, basePtrReg, remainder, TargetReg);
|
||||
}
|
||||
|
||||
/// visitAllocaInst - If this is a fixed size alloca, allocate space from the
|
||||
|
Loading…
Reference in New Issue
Block a user