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make IRBuilder zap "X|0" and "X&-1" when building IR, this happens
during bitfield codegen and slows down -O0 compile times by making useless IR. rdar://7362516 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86006 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -390,15 +390,21 @@ public:
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return Insert(BinaryOperator::CreateAShr(LHS, RHS), Name);
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}
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Value *CreateAnd(Value *LHS, Value *RHS, const Twine &Name = "") {
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if (Constant *LC = dyn_cast<Constant>(LHS))
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if (Constant *RC = dyn_cast<Constant>(RHS))
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if (Constant *RC = dyn_cast<Constant>(RHS)) {
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if (isa<ConstantInt>(RC) && cast<ConstantInt>(RC)->isAllOnesValue())
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return LHS; // LHS & -1 -> LHS
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if (Constant *LC = dyn_cast<Constant>(LHS))
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return Folder.CreateAnd(LC, RC);
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}
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return Insert(BinaryOperator::CreateAnd(LHS, RHS), Name);
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}
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Value *CreateOr(Value *LHS, Value *RHS, const Twine &Name = "") {
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if (Constant *LC = dyn_cast<Constant>(LHS))
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if (Constant *RC = dyn_cast<Constant>(RHS))
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if (Constant *RC = dyn_cast<Constant>(RHS)) {
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if (RC->isNullValue())
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return LHS; // LHS | 0 -> LHS
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if (Constant *LC = dyn_cast<Constant>(LHS))
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return Folder.CreateOr(LC, RC);
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}
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return Insert(BinaryOperator::CreateOr(LHS, RHS), Name);
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}
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Value *CreateXor(Value *LHS, Value *RHS, const Twine &Name = "") {
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