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Fix bug: ConstantMerge/2003-10-28-MergeExternalConstants.ll & PR64
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9579 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -52,14 +52,25 @@ bool ConstantMerge::run(Module &M) {
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if (I == CMap.end()) { // Nope, add it to the map
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CMap.insert(I, std::make_pair(Init, GV));
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} else { // Yup, this is a duplicate!
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} else if (GV->hasInternalLinkage()) { // Yup, this is a duplicate!
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// Make all uses of the duplicate constant use the canonical version...
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GV->replaceAllUsesWith(I->second);
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// Delete the global value from the module... and back up iterator to
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// not skip the next global...
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GV = --M.getGlobalList().erase(GV);
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++NumMerged;
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MadeChanges = true;
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} else if (I->second->hasInternalLinkage()) {
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// Make all uses of the duplicate constant use the canonical version...
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I->second->replaceAllUsesWith(GV);
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// Delete the global value from the module... and back up iterator to
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// not skip the next global...
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M.getGlobalList().erase(I->second);
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I->second = GV;
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++NumMerged;
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MadeChanges = true;
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}
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