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Handle some additonal cases of external weak globals.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71717 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -348,6 +348,20 @@ static Value *GetIfCondition(BasicBlock *BB,
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return 0;
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}
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/// findGlobalVariableBase - Recurse into a ConstantExpr to find the underlying
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/// GlobalVariable, if there is one.
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static GlobalVariable* findGlobalVariableBase(ConstantExpr* CE) {
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if (isa<GlobalVariable>(CE))
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return dyn_cast<GlobalVariable>(CE);
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if (CE->getOpcode()==Instruction::GetElementPtr ||
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CE->getOpcode()==Instruction::BitCast) {
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if (isa<GlobalVariable>(CE->getOperand(0)))
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return dyn_cast<GlobalVariable>(CE->getOperand(0));
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if (ConstantExpr *CE2 = dyn_cast<ConstantExpr>(CE->getOperand(0)))
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return findGlobalVariableBase(CE2);
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}
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return NULL;
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}
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/// DominatesMergePoint - If we have a merge point of an "if condition" as
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/// accepted above, return true if the specified value dominates the block. We
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@ -395,10 +409,14 @@ static bool DominatesMergePoint(Value *V, BasicBlock *BB,
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!isa<Constant>(I->getOperand(0)))
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return false;
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// External weak globals may have address 0, so we can't load them.
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if (GlobalVariable* GV= dyn_cast<GlobalVariable>(I->getOperand(0))) {
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if (GV->hasExternalWeakLinkage())
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return false;
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}
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GlobalVariable* GV = dyn_cast<GlobalVariable>(I->getOperand(0));
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if (GV && GV->hasExternalWeakLinkage())
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return false;
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// The global may be buried within a ConstantExpr.
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(I->getOperand(0)))
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GV = findGlobalVariableBase(CE);
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if (GV && GV->hasExternalWeakLinkage())
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return false;
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// Finally, we have to check to make sure there are no instructions
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// before the load in its basic block, as we are going to hoist the loop
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