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add support for phi translation and incorpation of new expression.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90782 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
d84ea47b89
commit
6fcca1cc87
@ -16,6 +16,22 @@
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#include "llvm/Analysis/InstructionSimplify.h"
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using namespace llvm;
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static bool CanPHITrans(Instruction *Inst) {
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if (isa<PHINode>(Inst) ||
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isa<BitCastInst>(Inst) ||
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isa<GetElementPtrInst>(Inst))
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return true;
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if (Inst->getOpcode() == Instruction::And &&
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isa<ConstantInt>(Inst->getOperand(1)))
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return true;
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// cerr << "MEMDEP: Could not PHI translate: " << *Pointer;
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// if (isa<BitCastInst>(PtrInst) || isa<GetElementPtrInst>(PtrInst))
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// cerr << "OP:\t\t\t\t" << *PtrInst->getOperand(0);
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return false;
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}
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/// IsPotentiallyPHITranslatable - If this needs PHI translation, return true
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/// if we have some hope of doing it. This should be used as a filter to
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/// avoid calling PHITranslateValue in hopeless situations.
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@ -23,18 +39,7 @@ bool PHITransAddr::IsPotentiallyPHITranslatable() const {
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// If the input value is not an instruction, or if it is not defined in CurBB,
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// then we don't need to phi translate it.
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Instruction *Inst = dyn_cast<Instruction>(Addr);
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if (isa<PHINode>(Inst) ||
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isa<BitCastInst>(Inst) ||
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isa<GetElementPtrInst>(Inst) ||
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(Inst->getOpcode() == Instruction::And &&
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isa<ConstantInt>(Inst->getOperand(1))))
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return true;
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// cerr << "MEMDEP: Could not PHI translate: " << *Pointer;
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// if (isa<BitCastInst>(PtrInst) || isa<GetElementPtrInst>(PtrInst))
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// cerr << "OP:\t\t\t\t" << *PtrInst->getOperand(0);
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return false;
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return Inst == 0 || CanPHITrans(Inst);
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}
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@ -44,129 +49,147 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
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Instruction *Inst = dyn_cast<Instruction>(V);
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if (Inst == 0) return V;
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// Determine whether 'Inst' is an input to our PHI translatable expression.
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bool isInput = std::count(InstInputs.begin(), InstInputs.end(), Inst);
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// If 'Inst' is not defined in this block, it is either an input, or an
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// intermediate result.
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if (Inst->getParent() != CurBB) {
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// If it is an input, then it remains an input.
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// If 'Inst' is defined in this block, it must be an input that needs to be
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// phi translated or an intermediate expression that needs to be incorporated
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// into the expression.
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if (Inst->getParent() == CurBB) {
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assert(std::count(InstInputs.begin(), InstInputs.end(), Inst) &&
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"Not an input?");
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// If this is a PHI, go ahead and translate it.
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if (PHINode *PN = dyn_cast<PHINode>(Inst))
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return PN->getIncomingValueForBlock(PredBB);
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// If this is a non-phi value, and it is analyzable, we can incorporate it
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// into the expression by making all instruction operands be inputs.
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if (!CanPHITrans(Inst))
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return 0;
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// Okay, we can incorporate it, this instruction is no longer an input.
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InstInputs.erase(std::find(InstInputs.begin(), InstInputs.end(), Inst));
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// All instruction operands are now inputs (and of course, they may also be
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// defined in this block, so they may need to be phi translated themselves.
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for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i)
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if (Instruction *Op = dyn_cast<Instruction>(Inst->getOperand(i)))
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InstInputs.push_back(Op);
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} else {
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// Determine whether 'Inst' is an input to our PHI translatable expression.
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bool isInput = std::count(InstInputs.begin(), InstInputs.end(), Inst);
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// If it is an input defined in a different block, then it remains an input.
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if (isInput)
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return Inst;
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// Otherwise, it must be an intermediate result. See if its operands need
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// to be phi translated, and if so, reconstruct it.
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if (BitCastInst *BC = dyn_cast<BitCastInst>(Inst)) {
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Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB);
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if (PHIIn == 0) return 0;
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if (PHIIn == BC->getOperand(0))
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return BC;
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// Find an available version of this cast.
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// Constants are trivial to find.
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if (Constant *C = dyn_cast<Constant>(PHIIn))
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return ConstantExpr::getBitCast(C, BC->getType());
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// Otherwise we have to see if a bitcasted version of the incoming pointer
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// is available. If so, we can use it, otherwise we have to fail.
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for (Value::use_iterator UI = PHIIn->use_begin(), E = PHIIn->use_end();
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UI != E; ++UI) {
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if (BitCastInst *BCI = dyn_cast<BitCastInst>(*UI))
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if (BCI->getType() == BC->getType())
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return BCI;
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}
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return 0;
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}
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// Handle getelementptr with at least one PHI translatable operand.
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if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Inst)) {
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SmallVector<Value*, 8> GEPOps;
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BasicBlock *CurBB = GEP->getParent();
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bool AnyChanged = false;
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for (unsigned i = 0, e = GEP->getNumOperands(); i != e; ++i) {
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Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB);
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if (GEPOp == 0) return 0;
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AnyChanged = GEPOp != GEP->getOperand(i);
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GEPOps.push_back(GEPOp);
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}
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if (!AnyChanged)
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return GEP;
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// Simplify the GEP to handle 'gep x, 0' -> x etc.
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if (Value *V = SimplifyGEPInst(&GEPOps[0], GEPOps.size(), TD))
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return V;
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// Scan to see if we have this GEP available.
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Value *APHIOp = GEPOps[0];
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for (Value::use_iterator UI = APHIOp->use_begin(), E = APHIOp->use_end();
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UI != E; ++UI) {
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if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(*UI))
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if (GEPI->getType() == GEP->getType() &&
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GEPI->getNumOperands() == GEPOps.size() &&
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GEPI->getParent()->getParent() == CurBB->getParent()) {
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bool Mismatch = false;
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for (unsigned i = 0, e = GEPOps.size(); i != e; ++i)
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if (GEPI->getOperand(i) != GEPOps[i]) {
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Mismatch = true;
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break;
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}
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if (!Mismatch)
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return GEPI;
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}
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}
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return 0;
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}
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// Handle add with a constant RHS.
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if (Inst->getOpcode() == Instruction::Add &&
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isa<ConstantInt>(Inst->getOperand(1))) {
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// PHI translate the LHS.
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Constant *RHS = cast<ConstantInt>(Inst->getOperand(1));
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bool isNSW = cast<BinaryOperator>(Inst)->hasNoSignedWrap();
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bool isNUW = cast<BinaryOperator>(Inst)->hasNoUnsignedWrap();
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Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB);
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if (LHS == 0) return 0;
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// If the PHI translated LHS is an add of a constant, fold the immediates.
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if (BinaryOperator *BOp = dyn_cast<BinaryOperator>(LHS))
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if (BOp->getOpcode() == Instruction::Add)
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if (ConstantInt *CI = dyn_cast<ConstantInt>(BOp->getOperand(1))) {
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LHS = BOp->getOperand(0);
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RHS = ConstantExpr::getAdd(RHS, CI);
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isNSW = isNUW = false;
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}
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// See if the add simplifies away.
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if (Value *Res = SimplifyAddInst(LHS, RHS, isNSW, isNUW, TD))
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return Res;
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// Otherwise, see if we have this add available somewhere.
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for (Value::use_iterator UI = LHS->use_begin(), E = LHS->use_end();
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UI != E; ++UI) {
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if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*UI))
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if (BO->getOperand(0) == LHS && BO->getOperand(1) == RHS &&
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BO->getParent()->getParent() == CurBB->getParent())
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return BO;
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}
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return 0;
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}
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// Otherwise, we failed.
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return 0;
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}
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// Otherwise, it is defined in this block. It must be an input and must be
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// phi translated.
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assert(isInput && "Instruction defined in block must be an input");
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// Ok, it must be an intermediate result (either because it started that way
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// or because we just incorporated it into the expression). See if its
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// operands need to be phi translated, and if so, reconstruct it.
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if (BitCastInst *BC = dyn_cast<BitCastInst>(Inst)) {
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Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB);
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if (PHIIn == 0) return 0;
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if (PHIIn == BC->getOperand(0))
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return BC;
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// Find an available version of this cast.
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// Constants are trivial to find.
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if (Constant *C = dyn_cast<Constant>(PHIIn))
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return ConstantExpr::getBitCast(C, BC->getType());
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// Otherwise we have to see if a bitcasted version of the incoming pointer
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// is available. If so, we can use it, otherwise we have to fail.
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for (Value::use_iterator UI = PHIIn->use_begin(), E = PHIIn->use_end();
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UI != E; ++UI) {
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if (BitCastInst *BCI = dyn_cast<BitCastInst>(*UI))
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if (BCI->getType() == BC->getType())
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return BCI;
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}
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return 0;
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}
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abort(); // unimplemented so far.
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// Handle getelementptr with at least one PHI translatable operand.
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if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Inst)) {
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SmallVector<Value*, 8> GEPOps;
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BasicBlock *CurBB = GEP->getParent();
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bool AnyChanged = false;
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for (unsigned i = 0, e = GEP->getNumOperands(); i != e; ++i) {
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Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB);
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if (GEPOp == 0) return 0;
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AnyChanged = GEPOp != GEP->getOperand(i);
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GEPOps.push_back(GEPOp);
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}
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if (!AnyChanged)
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return GEP;
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// Simplify the GEP to handle 'gep x, 0' -> x etc.
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if (Value *V = SimplifyGEPInst(&GEPOps[0], GEPOps.size(), TD))
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return V;
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// Scan to see if we have this GEP available.
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Value *APHIOp = GEPOps[0];
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for (Value::use_iterator UI = APHIOp->use_begin(), E = APHIOp->use_end();
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UI != E; ++UI) {
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if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(*UI))
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if (GEPI->getType() == GEP->getType() &&
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GEPI->getNumOperands() == GEPOps.size() &&
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GEPI->getParent()->getParent() == CurBB->getParent()) {
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bool Mismatch = false;
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for (unsigned i = 0, e = GEPOps.size(); i != e; ++i)
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if (GEPI->getOperand(i) != GEPOps[i]) {
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Mismatch = true;
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break;
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}
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if (!Mismatch)
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return GEPI;
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}
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}
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return 0;
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}
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// Handle add with a constant RHS.
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if (Inst->getOpcode() == Instruction::Add &&
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isa<ConstantInt>(Inst->getOperand(1))) {
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// PHI translate the LHS.
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Constant *RHS = cast<ConstantInt>(Inst->getOperand(1));
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bool isNSW = cast<BinaryOperator>(Inst)->hasNoSignedWrap();
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bool isNUW = cast<BinaryOperator>(Inst)->hasNoUnsignedWrap();
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Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB);
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if (LHS == 0) return 0;
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// If the PHI translated LHS is an add of a constant, fold the immediates.
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if (BinaryOperator *BOp = dyn_cast<BinaryOperator>(LHS))
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if (BOp->getOpcode() == Instruction::Add)
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if (ConstantInt *CI = dyn_cast<ConstantInt>(BOp->getOperand(1))) {
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LHS = BOp->getOperand(0);
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RHS = ConstantExpr::getAdd(RHS, CI);
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isNSW = isNUW = false;
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}
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// See if the add simplifies away.
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if (Value *Res = SimplifyAddInst(LHS, RHS, isNSW, isNUW, TD))
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return Res;
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// Otherwise, see if we have this add available somewhere.
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for (Value::use_iterator UI = LHS->use_begin(), E = LHS->use_end();
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UI != E; ++UI) {
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if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*UI))
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if (BO->getOperand(0) == LHS && BO->getOperand(1) == RHS &&
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BO->getParent()->getParent() == CurBB->getParent())
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return BO;
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}
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return 0;
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}
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// Otherwise, we failed.
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return 0;
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}
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