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Transform this:
%X = alloca ... %Y = alloca ... X == Y into false. This allows us to simplify some stuff in eon (and probably many other C++ programs) where operator= was checking for self assignment. Folding this allows us to SROA several additional structs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17735 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1870,12 +1870,14 @@ Instruction *InstCombiner::visitSetCondInst(BinaryOperator &I) {
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if (isa<UndefValue>(Op1)) // X setcc undef -> undef
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return ReplaceInstUsesWith(I, UndefValue::get(Type::BoolTy));
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// setcc <global/alloca*>, 0 - Global/Stack value addresses are never null!
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if (isa<ConstantPointerNull>(Op1) &&
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(isa<GlobalValue>(Op0) || isa<AllocaInst>(Op0)))
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// setcc <global/alloca*/null>, <global/alloca*/null> - Global/Stack value
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// addresses never equal each other! We already know that Op0 != Op1.
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if ((isa<GlobalValue>(Op0) || isa<AllocaInst>(Op0) ||
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isa<ConstantPointerNull>(Op0)) &&
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(isa<GlobalValue>(Op1) || isa<AllocaInst>(Op1) ||
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isa<ConstantPointerNull>(Op1)))
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return ReplaceInstUsesWith(I, ConstantBool::get(!isTrueWhenEqual(I)));
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// setcc's with boolean values can always be turned into bitwise operations
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if (Ty == Type::BoolTy) {
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switch (I.getOpcode()) {
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