From 6d8f2ca646bc283c31f48b6816d5194c836dfec6 Mon Sep 17 00:00:00 2001 From: Daniel Dunbar Date: Wed, 24 Feb 2010 08:48:04 +0000 Subject: Reapply r97010, the speculative revert failed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97036 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/PHITransAddr.cpp | 60 ++++++++++++++++++++----------------------- 1 file changed, 28 insertions(+), 32 deletions(-) (limited to 'lib/Analysis/PHITransAddr.cpp') diff --git a/lib/Analysis/PHITransAddr.cpp b/lib/Analysis/PHITransAddr.cpp index 334a188d12..8e4fa03f21 100644 --- a/lib/Analysis/PHITransAddr.cpp +++ b/lib/Analysis/PHITransAddr.cpp @@ -134,7 +134,8 @@ static void RemoveInstInputs(Value *V, } Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, - BasicBlock *PredBB) { + BasicBlock *PredBB, + const DominatorTree *DT) { // If this is a non-instruction value, it can't require PHI translation. Instruction *Inst = dyn_cast(V); if (Inst == 0) return V; @@ -177,7 +178,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, // operands need to be phi translated, and if so, reconstruct it. if (BitCastInst *BC = dyn_cast(Inst)) { - Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB); + Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB, DT); if (PHIIn == 0) return 0; if (PHIIn == BC->getOperand(0)) return BC; @@ -193,7 +194,8 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, for (Value::use_iterator UI = PHIIn->use_begin(), E = PHIIn->use_end(); UI != E; ++UI) { if (BitCastInst *BCI = dyn_cast(*UI)) - if (BCI->getType() == BC->getType()) + if (BCI->getType() == BC->getType() && + (!DT || DT->dominates(BCI->getParent(), PredBB))) return BCI; } return 0; @@ -204,7 +206,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, SmallVector GEPOps; bool AnyChanged = false; for (unsigned i = 0, e = GEP->getNumOperands(); i != e; ++i) { - Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB); + Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB, DT); if (GEPOp == 0) return 0; AnyChanged |= GEPOp != GEP->getOperand(i); @@ -229,7 +231,8 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, if (GetElementPtrInst *GEPI = dyn_cast(*UI)) if (GEPI->getType() == GEP->getType() && GEPI->getNumOperands() == GEPOps.size() && - GEPI->getParent()->getParent() == CurBB->getParent()) { + GEPI->getParent()->getParent() == CurBB->getParent() && + (!DT || DT->dominates(GEPI->getParent(), PredBB))) { bool Mismatch = false; for (unsigned i = 0, e = GEPOps.size(); i != e; ++i) if (GEPI->getOperand(i) != GEPOps[i]) { @@ -251,7 +254,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, bool isNSW = cast(Inst)->hasNoSignedWrap(); bool isNUW = cast(Inst)->hasNoUnsignedWrap(); - Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB); + Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB, DT); if (LHS == 0) return 0; // If the PHI translated LHS is an add of a constant, fold the immediates. @@ -287,7 +290,8 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, if (BinaryOperator *BO = dyn_cast(*UI)) if (BO->getOpcode() == Instruction::Add && BO->getOperand(0) == LHS && BO->getOperand(1) == RHS && - BO->getParent()->getParent() == CurBB->getParent()) + BO->getParent()->getParent() == CurBB->getParent() && + (!DT || DT->dominates(BO->getParent(), PredBB))) return BO; } @@ -300,33 +304,24 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB, /// PHITranslateValue - PHI translate the current address up the CFG from -/// CurBB to Pred, updating our state the reflect any needed changes. This -/// returns true on failure and sets Addr to null. -bool PHITransAddr::PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB) { +/// CurBB to Pred, updating our state to reflect any needed changes. If the +/// dominator tree DT is non-null, the translated value must dominate +/// PredBB. This returns true on failure and sets Addr to null. +bool PHITransAddr::PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB, + const DominatorTree *DT) { assert(Verify() && "Invalid PHITransAddr!"); - Addr = PHITranslateSubExpr(Addr, CurBB, PredBB); + Addr = PHITranslateSubExpr(Addr, CurBB, PredBB, DT); assert(Verify() && "Invalid PHITransAddr!"); - return Addr == 0; -} -/// GetAvailablePHITranslatedSubExpr - Return the value computed by -/// PHITranslateSubExpr if it dominates PredBB, otherwise return null. -Value *PHITransAddr:: -GetAvailablePHITranslatedSubExpr(Value *V, BasicBlock *CurBB,BasicBlock *PredBB, - const DominatorTree &DT) const { - PHITransAddr Tmp(V, TD); - Tmp.PHITranslateValue(CurBB, PredBB); - - // See if PHI translation succeeds. - V = Tmp.getAddr(); - - // Make sure the value is live in the predecessor. - if (Instruction *Inst = dyn_cast_or_null(V)) - if (!DT.dominates(Inst->getParent(), PredBB)) - return 0; - return V; -} + if (DT) { + // Make sure the value is live in the predecessor. + if (Instruction *Inst = dyn_cast_or_null(Addr)) + if (!DT->dominates(Inst->getParent(), PredBB)) + Addr = 0; + } + return Addr == 0; +} /// PHITranslateWithInsertion - PHI translate this value into the specified /// predecessor block, inserting a computation of the value if it is @@ -365,8 +360,9 @@ InsertPHITranslatedSubExpr(Value *InVal, BasicBlock *CurBB, SmallVectorImpl &NewInsts) { // See if we have a version of this value already available and dominating // PredBB. If so, there is no need to insert a new instance of it. - if (Value *Res = GetAvailablePHITranslatedSubExpr(InVal, CurBB, PredBB, DT)) - return Res; + PHITransAddr Tmp(InVal, TD); + if (!Tmp.PHITranslateValue(CurBB, PredBB, &DT)) + return Tmp.getAddr(); // If we don't have an available version of this value, it must be an // instruction. -- cgit v1.2.3