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Add interfaces to update value numbering results
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13677 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -39,13 +39,30 @@ struct ValueNumbering {
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///===-------------------------------------------------------------------===//
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/// Interfaces to update value numbering analysis information as the client
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/// changes the program
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/// changes the program.
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///
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/// deleteInstruction - Clients should invoke this method when they delete an
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/// instruction from the program. This allows the analysis implementations to
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/// avoid having dangling pointers in their representation.
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virtual void deleteInstruction(Instruction *I) {}
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/// deleteValue - This method should be called whenever an LLVM Value is
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/// deleted from the program, for example when an instruction is found to be
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/// redundant and is eliminated.
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///
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virtual void deleteValue(Value *V) {}
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/// copyValue - This method should be used whenever a preexisting value in the
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/// program is copied or cloned, introducing a new value. Note that analysis
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/// implementations should tolerate clients that use this method to introduce
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/// the same value multiple times: if the analysis already knows about a
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/// value, it should ignore the request.
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///
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virtual void copyValue(Value *From, Value *To) {}
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/// replaceWithNewValue - This method is the obvious combination of the two
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/// above, and it provided as a helper to simplify client code.
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///
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void replaceWithNewValue(Value *Old, Value *New) {
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copyValue(Old, New);
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deleteValue(Old);
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}
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};
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extern void BasicValueNumberingStub();
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